記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/j.1365-246X.2005.02773.x

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Imaging P-wave Scatterer Distribution around the Focal Area of the 2000 Western Tottori Earthquake (Mw6.6)
Matsumoto, S., K. Obara, N. Kimura, and M. Nakamura
Zisin, Vol.55, No.2, 229-232, 2002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2000GL011766

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Imaging of Inhomogeneous Structure Based on Seismic Array Observations
Satoshi MATSUMOTO
Zishin, Vol.54, No.1, 193-201, 2001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1046/j.1365-246x.2001.00339.x

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Imaging of Inhomogeneous Structure of the Crust beneath Ou Backbone Range, Northeastern Japan, Based on Small Aperture Seismic Array Observations
Matsumoto, S., K. Obara, K. Yoshimoto, T. Saito, A. Hasegawa, and A. Ito
Zishin, Vol.52, No.2, 283-297, 1999

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Tectonophysics  

Most of the seismicity in inland Kyushu, southwest Japan occur in the localized intraplate shear zones which are Beppu-Shimabara Graben (BSG) and left-lateral shear zone (LSZ). One of the largest fault systems in Japan (Median Tectonic Line—MTL), and subduction zone of the Philippine Sea Plate also exist near Kyushu. These suggest that the island arc, such as Kyushu has a complex deformation process. This study estimated the anelastic strain rate in the lower crust and the interplate coupling rate via inversion analysis using Global Navigation Satellite System data to elucidate the seismotectonics. Deformation in the lower crust and interplate coupling were modeled by cuboid volumetric sources and a back slip model, respectively. To stabilize the solution, a L2 regularization constraint was applied to the anelastic strain rate. Further, constraints on direction and smoothing to the slip deficit rate were applied. These strength of the constraints were determined via the minimum value of the Akaike Bayesian information criterion. The analyses showed that the anelastic strain rate of the BSG and LSZ was ∼0.6 ×10−6 yr−1, and BSG was related to MTL activity. The findings also suggest that this anelastic deformation in the lower crust created a stress concentration zone in the upper crust of BSG and LSZ, with a stress change rate of ∼6–10 kPa·yr−1. The value is consistent with the stress drop and recurrence interval of regional earthquakes, suggesting that the seismicity around BSG and LSZ is strongly influenced by anelastic deformation in the lower crust. It is also suggested that BSG and LSZ development is influenced by slab rollback, and a subducting ridge. Lastly, a comparison between the deviatoric stress field estimated using focal mechanisms and the anelastic strain rate suggests the existence of a shear zone consisting of weak faults south of BSG.

DOI： 10.1016/j.tecto.2022.229674

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Scientific Reports  

Continuous seismic monitoring could play a pivotal role in deep geothermal energy exploration. We monitored seismicity near geothermal production areas of the Kuju volcanic complex with a dense seismic network and automated event detection. Most events were shallow (less than 3 km below sea level) and distributed along a boundary between regions of high and low resistivity and S-wave velocity, interpreted as a lithological boundary or related fracture zone. Deeper events located on top of subvertical conductors may reflect fracturing associated with magmatic fluid intrusion. A correlation may exist between seismicity and heavy rainfall three days prior to increased pore pressure in pre-existing fractures. Our findings support the presence of supercritical geothermal fluids and demonstrate the importance of continuous seismic monitoring in supercritical geothermal energy exploration.

DOI： 10.1038/s41598-023-35159-8

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記述言語：その他   掲載種別：研究論文（学術雑誌）  

SUMMARY

How are the sizes of the earthquakes determined? To solve this important problem, we analysed the data from a dense temporary seismic observation network installed in the aftershock area of the 2016 Mw 6.2 Central Tottori earthquake, which occurred in an intraplate region in Japan. We compared the stress field estimated from approximately 10 000 accurate focal mechanisms of aftershocks with the calculated post-earthquake stress field and found that the differential stress before the earthquake was very small near both horizontal edges. These results did not depend significantly on the modeled slip distribution and the orientation of the principal stress before the earthquake. Similar results were obtained for the 2000 Mw 6.7 Western Tottori earthquake, which also occurred in the same intraplate region in Japan. These results suggest that the fault size of large intraplate earthquakes can be determined by the region of small differential stress surrounding future earthquake faults.

DOI： 10.1093/gji/ggac521

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Relative to more mature fault zones, immature fault zones that have accumulated smaller total displacement are characterized by less efficient strain localization and more complicated earthquake ruptures. How differences in maturation are reflected in regional-scale upper-crustal fracturing is not well known. Recently, complicated earthquake ruptures associated with immature fault zones, such as the 2016 Kaikoura earthquake in New Zealand, have occurred in areas that are in regional proximity (< 100 km away) to more mature faults. Here we examine whether inefficient strain localization in less mature fault zones is associated with a broader distribution and anomalously elevated concentration of fractures over distances of tens of kilometers. We use regional seismic arrival-time tomography in a broad area around the Kaikoura earthquake to investigate lateral variations in Vp and Vp/Vs. Focusing on the extensively faulted but compositionally uniform Torlesse-Pahau terrane in the Marlborough region where the earthquake occurred, we attribute lateral variations in Vp and Vp/Vs to differences in concentration of fluid-filled fractures. Using numerical models relating seismic velocities and fracturing, we solve for the lateral variation in concentration of ~0.01 aspect ratio fluid-filled fractures. We find that areas near the Kaikoura rupture have > 3&#37; elevated fracture porosity compared to the adjacent area to the north. The elevated regional fracturing in the Kaikoura area is interpreted to result from more distributed deformation, and broader distribution of earthquakes, due to inefficient localization of strain from a regionally uniform strain rate field, highlighting the relationship between relative maturity of upper-crustal fault zones and lateral variability of regional upper-crustal properties. Plain language summary: When earthquakes occur in immature fault zones (areas that have accumulated small total displacement), they tend to rupture multiple poorly developed faults of diverse orientations. In contrast, more mature fault zones are associated with more developed, smoother faults and more localized earthquake activity. How these differences in maturation are reflected in the regional distribution of fractures is not well known. Here we use the arrival times of P and S waves from earthquakes to constrain seismic velocities (Vp and Vp/Vs) and use numerical models to relate seismic velocities to fracture concentration. We focus on the Marlborough region of the South Island, New Zealand, where immature fault zones recently ruptured during the 2016 Kaikoura earthquake but which also has more mature fault zones < 100 km away. We find elevated fracture concentrations (3&#37; higher fracture porosity), indicative of more distributed deformation along immature fault zones relative to more mature fault zones. In immature settings, fracturing is not as effectively localized along individual fault traces, leading to a broadly distributed fracture network.

DOI： 10.1016/j.epsl.2022.117666

記述言語：英語   掲載種別：研究論文（学術雑誌）  

責任著者として執筆を代理で行った

DOI： 10.1016/j.tecto.2022.229390

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Velocity changes around the Kaikōura earthquake ruptures from ambient noise cross-correlations

DOI： 10.1093/gji/ggab514

記述言語：その他   掲載種別：研究論文（学術雑誌）  

<title>Abstract</title>Young faults display unique complexity associated with their evolution, but how this relates to earthquake occurrence is unclear. Unravelling the fine-scale complexity in these systems could lead to a greater understanding of ongoing strain localization in young fault zones. Here we present high-spatial-resolution images of seismic sources and structural properties along a young fault zone that hosted the Tottori earthquake (Mw 6.8) in southwest Japan in 2000, based on data from a hyperdense network of ~1,000 seismic stations. Our precise micro-earthquake catalog reveals conjugate faulting over multiple length scales. These conjugate faults are well developed in zones of low seismic velocity. A vertically dipping seismic cluster of about 200 m length occurs within a width of about 10 m. Earthquake migrations in this cluster have a speed of about 30 m per day, which suggests that fluid diffusion plays a role. We suggest that fine structural complexities influence the pattern of seismicity in a developing fault system.

DOI： 10.1038/s43247-020-00086-3

記述言語：その他   掲載種別：研究論文（学術雑誌）  

<title>Abstract</title>After a large earthquake, many small earthquakes, called aftershocks, ensue. Additional large earthquakes typically do not occur, despite the fact that the large static stress near the edges of the fault is expected to trigger further large earthquakes at these locations. Here we analyse ~10,000 highly accurate focal mechanism solutions of aftershocks of the 2016 Mw 6.2 Central Tottori earthquake in Japan. We determine the location of the horizontal edges of the mainshock fault relative to the aftershock hypocentres, with an accuracy of approximately 200 m. We find that aftershocks rarely occur near the horizontal edges and extensions of the fault. We propose that the mainshock rupture was arrested within areas characterised by substantial stress relaxation prior to the main earthquake. This stress relaxation along fault edges could explain why mainshocks are rarely followed by further large earthquakes.

DOI： 10.1038/s43247-021-00231-6

記述言語：その他   掲載種別：研究論文（学術雑誌）  

<title>Abstract</title>The tectonic stress field was investigated in and around the aftershock area of the Hokkaido Eastern Iburi earthquake (<italic>M</italic>_JMA = 6.7) occurred on 6 September 2018. We deployed 26 temporary seismic stations in the aftershock area for approximately 2 months and located 1785 aftershocks precisely. Among these aftershocks, 894 focal mechanism solutions were determined using the first-motion polarity of P wave from the temporary observation and the permanent seismic networks of Hokkaido University, Japan Meteorological Agency (JMA), and High Sensitivity Seismograph Network Japan (Hi-net). We found that (1) the reverse faulting and the strike-slip faulting are dominant in the aftershock area, (2) the average trend of P- and T-axes is 78° ± 33° and 352° ± 51°, respectively, and (3) the average plunge of P- and T-axes is 25° ± 16° and 44° ± 20°, respectively: the P-axis is close to be horizontal and the T-axis is more vertical than the average of the P-axes. We applied a stress inversion method to the focal mechanism solutions to estimate a stress field in the aftershock area. As a result, we found that the reverse fault type stress field is dominant in the aftershock area. An axis of the maximum principal stress (<italic>σ</italic>₁) has the trend of 72° ± 7° and the dipping eastward of 19° ± 4° and an axis of the intermediate principal stress (<italic>σ</italic>₂) has the trend of 131° ± 73° and the dipping southward of 10° ± 9°, indicating that both of <italic>σ</italic>₁- and <italic>σ</italic>₂-axes are close to be horizontal. An axis of the minimum principal stress (<italic>σ</italic>₃) has the dipping westward of 67° ± 6° that is close to be vertical. The results strongly suggest that the reverse-fault-type stress field is predominant as an average over the aftershock area which is in the western boundary of the Hidaka Collision Zone. The average of the stress ratio <italic>R</italic> = (<italic>σ</italic>₁ − <italic>σ</italic>₂)/(<italic>σ</italic>₁ − <italic>σ</italic>₃) is 0.61 ± 0.13 in the whole aftershock area. Although not statistically significant, we suggest that <italic>R</italic> decreases systematically as the depth is getting deep, which is modeled by a quadratic polynomial of depth.

DOI： 10.1186/s40623-020-01323-x

記述言語：その他   掲載種別：研究論文（学術雑誌）  

<title>Abstract</title>Crustal earthquake ruptures tend to initiate near fluid-rich zones. However, it is relatively unknown whether fluid-rich zones can further promote or arrest these ruptures. We image the electrical resistivity structure around the focal area of the 2016 Kumamoto earthquake sequence by using 200 sites broadband magnetotelluric data, and discuss its quantitative relationship to earthquake initiation, growth, and arrest processes. The ruptures that initiated along the outer edge of the low-resistivity fluid-rich zones (< 30 Ωm) tended to become large earthquakes, whereas those that initiated either distal to or within the fluid-rich zones did not. The ruptures were arrested by high-temperature (> 400 °C) fluid-rich zones, whereas shallower low-temperature (200–400 °C) fluid-rich zones either promoted or arrested the ruptures. These results suggest that the distribution of mid-crustal fluids contributes to the initiation, growth, and arrest of crustal earthquakes. The pre-failure pressure/temperature gradient (spatial difference) of the pore fluids may contribute to the rupture initiation, propagation, and arrest.

DOI： 10.1186/s40623-020-01340-w

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1186/s40623-020-01329-5

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1093/gji/ggab514

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1038/s43247-021-00231-6

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s43247-020-00086-3

記述言語：英語   掲載種別：研究論文（学術雑誌）  

To clarify the relationship between earthquake occurrence and fluid, we analyzed data from a dense aftershock-observation network with 69 high-gain short-period seismographs installed immediately after the mainshock occurrence (October 21) in the aftershock area of the 2016 Central Tottori Prefecture earthquake. We determined the hypocenters and focal mechanisms of the aftershocks very precisely in the period from October 22 to December 15. We then investigated the temporal changes in the spatial distributions of hypocenters and T-axis azimuths of focal mechanisms. The distributions of aftershock hypocenters and T-axis azimuths are basically temporally stable, except those in limited portions in the shallow layer near the western edge of the aftershock area, where rapid decrease of aftershocks with T-axis azimuths of WSW to west was observed. If fluid rises from the lower crust due to fault rupture, the locations of aftershocks and focal mechanisms may change over time, especially in the deepest part of the aftershock region. However, the temporal change in these parameters was not apparent at depth. These observations suggest that the aftershock activity of the Central Tottori Prefecture earthquake was controlled mainly by stress concentration rather than strength reduction due to high fluid pressure.[Figure not available: see fulltext.].

DOI： 10.1186/s40623-020-01161-x

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Large earthquakes can diminish and redistribute stress, which can change the stress field in the Earth's crust. Seismic anisotropy, measured through shear wave splitting (SWS), is often considered to be an indicator of stress in the crust because the closure of cracks due to differential stress leads to waves polarized parallel to the cracks travelling faster than in the orthogonal direction. We examine spatial and temporal variations in SWS measurements and the V-p/V-s ratio associated with the 2013 Cook Strait (Seddon, Grassmere) and 2016 Kaikoura earthquakes in New Zealand. These earthquake sequences provide a unique data set, where clusters of closely spaced earthquakes occurred. We use an automatic, objective splitting analysis algorithm and automatic local S-phase pickers to expedite the processing and to minimize observer bias. We present SWS and V-p/V-s measurements for over 40 000 crustal earthquakes across 36 stations spanning close to 51/2 yr between 2013 and 2018. We obtain a total of 102 260 (out of 398 169) high-quality measurements. We observe significant spatial variations in the fast polarization orientation, phi. The orientation of gravitational stresses are consistent with most of the observed anisotropy. However, multiple mechanisms (such as structural, tectonic stresses and gravitational stresses) may control some of the observed crustal anisotropy in the study area. Systematic analysis of SWS parameters and V-p/V-s ratios revealed that apparent temporal variations are caused by variation in earthquake path through spatially varying media.

DOI： 10.1093/gji/ggaa433

記述言語：その他   掲載種別：研究論文（学術雑誌）  

© 2020, The Author(s). Inelastic deformation due to seismic activity is an important signal that reflects fault evolution. In particular, aftershock sequences indicate the evolution of damage in a medium that has experienced a large earthquake. Herein, we discuss the inelastic strain rate surrounding the fault that produced the M 7.3 Western Tottori earthquake in 2000 using long-term aftershock analysis. To obtain high-resolution focal mechanisms 18 years after the earthquake occurrence, we conducted dense seismic observations in the focal area. The inelastic strain rate estimated from the aftershock seismic moment tensor data showed spatial variations within a range of 10−7–10−11 per year, 18 years after the main shock. By comparing the inelastic strain rates from immediately after the earthquake and 18 years later, we detected the increase in the spatial variations in the inelastic strain rate; the variations are as small as 102 (= 10−5/10−7) for the early stage but as large as 104 (= 10−7/10−11) for the later period. In addition, the decay of the rate during these two periods varied spatially from spatial bin to bin. Certain bins in the northern segment of the earthquake fault, southern edge of the fault, and surrounding the location of the preceding swarm activity to the M 7.3 event showed slower decay rates than the inverse of the lapse time since the occurrence of the M 7.3 earthquake. We modeled this decay rate change as the relaxation response of a power-law fluid to an elastic strain input from the large earthquake. Most parts of the fault can be explained by this model. However, the areas with low decay rates suggest the presence of a dragging mechanism, such as aseismic slip, at or around these locations. [Figure not available: see fulltext.]

DOI： 10.1186/s40623-020-01186-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Shallow, implosive non-double-couple (NDC) earthquakes have been detected beneath Unzen Volcano, Japan, by a routinely operated seismometer network. Here, we analyze the waveforms from 14 temporary seismic stations around Mt. Fugen (Fugendake) and Heisei-Shinzan Lava Dome, which formed during the 1990-1995 eruptions, to further investigate this shallow seismicity. We also estimate the subsurface electrical resistivity structure using broadband magnetotelluric observations and investigate its relationship to the shallow seismicity. We find that (1) implosive NDC earthquakes occur at the craters that were active during the 1990-1991 eruptions, which are currently buried by the approximately 200-m-thick Heisei-Shinzan Lava Dome; (2) the detected NDC earth-quakes generally possess downward P-wave arrivals, although upward P-wave arrivals are observed at a few seismic stations; (3) the tensile axes of the NDC earthquakes show various slip directions; (4) repeated NDC earthquakes are in some cases detected within 20 s of the initial event; and (5) a high-resistivity zone exists beneath the NDC earthquakes. We conclude that the implosive NDC earthquakes were generated by the collapse of small, randomly oriented, vapor-filled voids at the two buried craters, with active volcanic conduits still present beneath these craters. The shallow DC earthquakes consist of two clusters that are located 2-3 km below the NDC earthquakes. The focal mechanisms of the shallower cluster (approximately 2 km depth) indicate various fault mechanism, whereas those of the deeper cluster (approximately 3 km depth) indicate strike-slip faulting. The top of the shallower cluster corresponds to the base of the conductive zone, which suggests that the DC earth-quakes in the shallower cluster are generated in a zone of high pore pressure that is capped by a hydrothermally altered clay layer. (C) 2020 The Authors. Published by Elsevier B.V.

DOI： 10.1016/j.jvolgeores.2020.107066

記述言語：英語   掲載種別：研究論文（学術雑誌）  

For understanding the physical condition of earthquake generation, we estimated the deviatoric stress fields and fault planes of the large earthquakes in the hypocentral area of the 2016 Kumamoto earthquake sequence, central Kyushu, Japan. We analyzed precise hypocenters and their focal mechanism tensors from 1993 to 2017 and found the complex fault planes of the largest foreshock and the mainshock during the sequence. The faults of large earthquakes could not be detected from the preceding high seismic activity in the area to the mainshock. The analyses of the deviatoric stress tensors obtained from pre- and post-sequence seismic moment tensor data revealed the temporal change in the deviatoric stress field at the vicinity of the hypocenters of the largest foreshock and the mainshock. Because of this temporal change, we found that the stress level of the deviatoric stress field in this region is the same level as the co-seismic stress change caused by the two large earthquakes. We attempted to estimate the differential stress at the region using a new method, which can be applied to the heterogeneous stress fields. The average value of the estimated differential stresses in the region was 15.4 +/- 10 MPa. The rotation of the principal stress axes and the low differential stress are important information to understand the physical processes of the earthquake generation and the state of the crustal stress.

DOI： 10.1029/2019JB018515

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2019jb018742

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

The Quaternary Tectonics of Central Kyushu and the 2016 Kumamoto Earthquake: From a Multifaceted Viewpoint Combining Geology, Seismology, and Geodesy

DOI： 10.5026/jgeography.129.565

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1186/s40623-020-01186-2

その他リンク： https://earth-planets-space.springeropen.com/articles/10.1186/s40623-020-01186-2#article-info

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1093/gji/ggaa008

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2019JB018742

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Earthquakes with non-double-couple (NDC) components are indicators of geometric fault complexity, anisotropy, tensile failure, and fluid flow effects. NDC earthquakes have been observed in volcanic zones and interpreted as faulting related to fluid effects in the hypocentral region. In this study, we provide evidence of the occurrence of microearthquakes with NDC components in a tectonic zone. Aftershocks of the 2000 Western Tottori earthquake revealed definite NDC components based on a polarity analysis of the first P wave motion data from a hyperdense seismic observation. We modeled these events using both shear faulting with tensile failure and multiple shear ruptures. Six of the eight NDC events were well modeled by shear faults accompanied with an opening tensile crack. These results suggest that pressurized fluid or a weak tensile crack may exist along the rupture zone of the Tottori earthquake.

DOI： 10.1029/2019GL084841

記述言語：その他   掲載種別：研究論文（学術雑誌）  

©2020. American Geophysical Union. All Rights Reserved. Earthquakes with non-double-couple (NDC) components are indicators of geometric fault complexity, anisotropy, tensile failure, and fluid flow effects. NDC earthquakes have been observed in volcanic zones and interpreted as faulting related to fluid effects in the hypocentral region. In this study, we provide evidence of the occurrence of microearthquakes with NDC components in a tectonic zone. Aftershocks of the 2000 Western Tottori earthquake revealed definite NDC components based on a polarity analysis of the first P wave motion data from a hyperdense seismic observation. We modeled these events using both shear faulting with tensile failure and multiple shear ruptures. Six of the eight NDC events were well modeled by shear faults accompanied with an opening tensile crack. These results suggest that pressurized fluid or a weak tensile crack may exist along the rupture zone of the Tottori earthquake.

DOI： 10.1029/2019GL084841

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The 2011 Tohoku-Oki Earthquake (M9.0) significantly affected inland areas of Japan. The crust and mantle response to the magathrust earthquake induced changes in the mechanical conditions of the seismo-genic zone. Here we present important progress in the research into the seismogenesis of inland earthquakes. Stress, strain, strength, and structures are key parameters affecting the occurrence of earthquakes. In par-ticular, both the spatial and temporal changes in these parameters around the focal areas of the large inland earthquakes have been detected and modeled. These results have provided spatial potential evaluation in terms of future inland earthquake occurrence. How-ever, we clearly recognize that, in order to understand and predict the inland earthquake generation process, it will inevitably be necessary to unify the research on various spatial and temporal scales, from problems related to long-term stress loading from plate-relative motion to instant fault response.

DOI： 10.20965/jdr.2020.p0096

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The Hokkaido Eastern Iburi earthquake (MJMA = 6.7) occurred on September 6, 2018, in the Hokkaido corner region where the Kurile and northeastern Japan island arcs meet. We relocated aftershocks of this intraplate earthquake immediately after the main shock by using data from a permanent local seismic network and found that aftershock depths were concentrated from 20 to 40 km, which is extraordinarily deep compared with other shallow intraplate earthquakes in the inland area of Honshu and Kyushu, Japan. Further, we found that the aftershock area consists of three segments. The first segment is located in the northern part of the aftershock area, the second segment lies in the southern part, and the third segment forms a stepover between the other two segments. The hypocenter of the main shock, from which the rupture initiated, is located on the stepover segment. The centroid moment tensor solution for the main shock indicates a reverse faulting, whereas the focal mechanism solution determined by using the first-motion polarity of the P wave indicates strike-slip faulting. To explain this discrepancy qualitatively, we present a model in which the rupture started as a small strike-slip fault in the stepover segment of the aftershock area, followed by two large reverse faulting ruptures in the northern and southern segments.[Figure not available: see fulltext.].

DOI： 10.1186/s40623-019-1032-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The Hokkaido Eastern Iburi earthquake (M_JMA = 6.7) occurred on September 6, 2018, in the Hokkaido corner region where the Kurile and northeastern Japan island arcs meet. We relocated aftershocks of this intraplate earthquake immediately after the main shock by using data from a permanent local seismic network and found that aftershock depths were concentrated from 20 to 40 km, which is extraordinarily deep compared with other shallow intraplate earthquakes in the inland area of Honshu and Kyushu, Japan. Further, we found that the aftershock area consists of three segments. The first segment is located in the northern part of the aftershock area, the second segment lies in the southern part, and the third segment forms a stepover between the other two segments. The hypocenter of the main shock, from which the rupture initiated, is located on the stepover segment. The centroid moment tensor solution for the main shock indicates a reverse faulting, whereas the focal mechanism solution determined by using the first-motion polarity of the P wave indicates strike-slip faulting. To explain this discrepancy qualitatively, we present a model in which the rupture started as a small strike-slip fault in the stepover segment of the aftershock area, followed by two large reverse faulting ruptures in the northern and southern segments.[Figure not available: see fulltext.].

DOI： 10.1186/s40623-019-1032-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Comparative tomography of reverse-slip and strike-slip seismotectonic provinces in the northern South Island, New Zealand
Actively deforming crust and upper mantle around the obliquely convergent Pacific-Australia plate boundary in the northern South Island of New Zealand have been investigated by seismic tomography using data from a temporary c. 50 station network plus GEONET. The Alpine-Wairau Fault (principal component of the plate boundary at the surface) transects the study area, separating the Buller-Nelson (BN) province of active compressional inversion involving steep reverse faulting to the northwest, from the Marlborough fault system (MA) dominated by dextral strike-slip faulting to the southeast. In the course of this study, MA hosted the 2013 Seddon earthquake sequence (M5.9, 6.6) and the 2016 M7.8 Kaikoura earthquake. Active fault structures and present seismicity are associated with a heterogeneous distribution of low-velocity and Vp/Vs anomalies. Elsewhere, there is a general association between crustal seismicity and low-velocity zones along major fault structures within both the MA and BN seismotectonic provinces along which high Vp/Vs anomalies are locally conspicuous. Areas of active crustal seismicity are also generally characterized by high Vp/Vs, for instance the hypocentre and aftershocks of the 2016 M7.8 Kaikoura earthquake overlie a low-velocity region with high Vp/Vs. The coincidence of anomalously low Vp and Vs and anomalously high Vp/Vs with zones of high electrical conductivity defined by a previous MT transect is consistent with the notion that upward migration of overpressured hydrothermal fluid from the subducting slab at depth leads to a heterogeneous distribution of overpressured fluid in and around the base of the crustal seismogenic zone, weakening the overlying crust and promoting seismic rupture along major fault systems. It seems possible that the Association of mid-crustal low-velocity zones with anomalously high Vp/Vs may diagnose rupture preparation zones where frictional strength is being lowered by the build-up of fluid overpressure concurrent with accumulating shear stress, so that eventual fault failure is 'dual-driven'.

DOI： 10.1016/j.tecto.2019.03.016

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Actively deforming crust and upper mantle around the obliquely convergent Pacific-Australia plate boundary in the northern South Island of New Zealand have been investigated by seismic tomography using data from a temporary c. 50 station network plus GEONET. The Alpine-Wairau Fault (principal component of the plate boundary at the surface) transects the study area, separating the Buller-Nelson (BN) province of active compressional inversion involving steep reverse faulting to the northwest, from the Marlborough fault system (MA) dominated by dextral strike-slip faulting to the southeast. In the course of this study, MA hosted the 2013 Seddon earthquake sequence (M5.9, 6.6) and the 2016 M7.8 Kaikoura earthquake. Active fault structures and present seismicity are associated with a heterogeneous distribution of low-velocity and Vp/Vs anomalies. Elsewhere, there is a general association between crustal seismicity and low-velocity zones along major fault structures within both the MA and BN seismotectonic provinces along which high Vp/Vs anomalies are locally conspicuous. Areas of active crustal seismicity are also generally characterized by high Vp/Vs, for instance the hypocentre and aftershocks of the 2016 M7.8 Kaikoura earthquake overlie a low-velocity region with high Vp/Vs. The coincidence of anomalously low Vp and Vs and anomalously high Vp/Vs with zones of high electrical conductivity defined by a previous MT transect is consistent with the notion that upward migration of overpressured hydrothermal fluid from the subducting slab at depth leads to a heterogeneous distribution of overpressured fluid in and around the base of the crustal seismogenic zone, weakening the overlying crust and promoting seismic rupture along major fault systems. It seems possible that the Association of mid-crustal low-velocity zones with anomalously high Vp/Vs may diagnose rupture preparation zones where frictional strength is being lowered by the build-up of fluid overpressure concurrent with accumulating shear stress, so that eventual fault failure is ‘dual-driven’.

DOI： 10.1016/j.tecto.2019.03.016

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The 2018 Hokkaido Eastern Iburi earthquake (MJMA = 6.7) was triggered by a strike-slip faulting in a stepover segment: Insights from the aftershock distribution and the focal mechanism solution of the main shock
The Hokkaido Eastern Iburi earthquake (M-JMA=6.7) occurred on September 6, 2018, in the Hokkaido corner region where the Kurile and northeastern Japan island arcs meet. We relocated aftershocks of this intraplate earthquake immediately after the main shock by using data from a permanent local seismic network and found that aftershock depths were concentrated from 20 to 40km, which is extraordinarily deep compared with other shallow intraplate earthquakes in the inland area of Honshu and Kyushu, Japan. Further, we found that the aftershock area consists of three segments. The first segment is located in the northern part of the aftershock area, the second segment lies in the southern part, and the third segment forms a stepover between the other two segments. The hypocenter of the main shock, from which the rupture initiated, is located on the stepover segment. The centroid moment tensor solution for the main shock indicates a reverse faulting, whereas the focal mechanism solution determined by using the first-motion polarity of the P wave indicates strike-slip faulting. To explain this discrepancy qualitatively, we present a model in which the rupture started as a small strike-slip fault in the stepover segment of the aftershock area, followed by two large reverse faulting ruptures in the northern and southern segments.

DOI： 10.1186/s40623-019-1032-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Schemes for predicting seismic ground motion, including real-time prediction (earthquake early warning [EEW]), ideally should incorporate the effects of the source, path, and site amplification terms. In this study, we incorporated the path term into the numerical shake prediction scheme, a promising approach to EEW, in an effort to predict future ground motions with a heterogeneous attenuation structure. We characterized the heterogeneous attenuation structure of southwestern Japan using multiple lapse time window analysis, then incorporated that attenuation structure in a simulation of ground-motion prediction for the largest earthquake (M_w 7.0) of the 2016 Kumamoto earthquake sequence. The heterogeneous attenuation structure led to improvements over a homogeneous structure: the root mean square residuals of the predicted seismic intensities were 12% lower for predictions 10 s ahead and 15% lower for predictions 20 s ahead, suggesting that the benefit of using a heterogeneous attenuation structure is greater for longer lead times. Our results show that details of the attenuation structure should be considered to lengthen the lead time of ground-motion predictions by the numerical shake prediction scheme.

DOI： 10.1785/0120180063

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Schemes for predicting seismic ground motion, including real-time prediction (earthquake early warning [EEW]), ideally should incorporate the effects of the source, path, and site amplification terms. In this study, we incorporated the path term into the numerical shake prediction scheme, a promising approach to EEW, in an effort to predict future ground motions with a heterogeneous attenuation structure. We characterized the heterogeneous attenuation structure of southwestern Japan using multiple lapse time window analysis, then incorporated that attenuation structure in a simulation of ground-motion prediction for the largest earthquake (M-w 7.0) of the 2016 Kumamoto earthquake sequence. The heterogeneous attenuation structure led to improvements over a homogeneous structure: the root mean square residuals of the predicted seismic intensities were 12% lower for predictions 10 s ahead and 15% lower for predictions 20 s ahead, suggesting that the benefit of using a heterogeneous attenuation structure is greater for longer lead times. Our results show that details of the attenuation structure should be considered to lengthen the lead time of ground-motion predictions by the numerical shake prediction scheme.

DOI： 10.1785/0120180063

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Fault behavior during an earthquake is controlled by the state of stress on the fault. Complex coseismic fault slip on large earthquake faults has recently been observed by dense seismic networks, which complicates strong motion evaluations for potential faults. Here we show the three-dimensional prestress field related to the 2016 Kumamoto earthquake. The estimated stress field reveals a spatially variable state of stress that forced the fault to slip in a direction predicted by the “Wallace and Bott Hypothesis.” The stress field also exposes the pre-condition of pore fluid pressure on the fault. Large coseismic slip occurred in the low-pressure part of the fault. However, areas with highly pressured fluid also showed large displacement, indicating that the seismic moment of the earthquake was magnified by fluid pressure. These prerupture data could contribute to improved seismic hazard evaluations.

DOI： 10.1002/2017GL075725

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The M _JMA 7.3 Kumamoto earthquake that occurred at 1:25 JST on April 16, 2016, not only triggered aftershocks in the vicinity of the epicenter, but also triggered earthquakes that were 50-100 km away from the epicenter of the main shock. The active seismicity can be divided into three regions: (1) the vicinity of the main faults, (2) the northern region of Aso volcano (50 km northeast of the mainshock epicenter), and (3) the regions around three volcanoes, Yufu, Tsurumi, and Garan (100 km northeast of the mainshock epicenter). Notably, the zones between these regions are distinctively seismically inactive. The electric resistivity structure estimated from one-dimensional analysis of the 247 broadband (0.005-3000 s) magnetotelluric and telluric observation sites clearly shows that the earthquakes occurred in resistive regions adjacent to conductive zones or resistive-conductive transition zones. In contrast, seismicity is quite low in electrically conductive zones, which are interpreted as regions of connected fluids. We suggest that the series of the earthquakes was induced by a local accumulated stress and/or fluid supply from conductive zones. Because the relationship between the earthquakes and the resistivity structure is consistent with previous studies, seismic hazard assessment generally can be improved by taking into account the resistivity structure. Following on from the 2016 Kumamoto earthquake series, we suggest that there are two zones that have a relatively high potential of earthquake generation along the western extension of the MTL. [Figure not available: see fulltext.]

DOI： 10.1186/s40623-016-0590-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Volcano monitoring systems are not always ready to resolve signals at the onset of eruptive activity. This study makes use of stations installed later to calibrate the performance of the stations that had been operated before the eruption. Seven stations recorded continuous volcanic tremor before and during the subplinian eruptions of Shinmoe-dake, Japan, in 2011. We estimated the source locations of the tremor using the amplitude distribution. The stability of the analysis was obtained by careful selection of time windows in which signals from a single source are dominated. The site effects and the regional attenuation factor were evaluated using tremor recorded after the major eruptions by a dense seismic array and a good number of stations. A tremor source changed its depth beneath the crater for 1 week before the major eruption, rising from a depth of a few kilometer to the water layer 3 times, each of which occurred following shallow inflation and minor eruptions. It is interpreted as migration of gas probably with magma, which further transported heat to the water layer and triggered the subplinian eruptions.

DOI： 10.1002/2017GL075293

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Volcano monitoring systems are not always ready to resolve signals at the onset of eruptive activity. This study makes use of stations installed later to calibrate the performance of the stations that had been operated before the eruption. Seven stations recorded continuous volcanic tremor before and during the subplinian eruptions of Shinmoe-dake, Japan, in 2011. We estimated the source locations of the tremor using the amplitude distribution. The stability of the analysis was obtained by careful selection of time windows in which signals from a single source are dominated. The site effects and the regional attenuation factor were evaluated using tremor recorded after the major eruptions by a dense seismic array and a good number of stations. A tremor source changed its depth beneath the crater for 1 week before the major eruption, rising from a depth of a few kilometer to the water layer 3 times, each of which occurred following shallow inflation and minor eruptions. It is interpreted as migration of gas probably with magma, which further transported heat to the water layer and triggered the subplinian eruptions.

DOI： 10.1002/2017GL075293

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We investigate seismic wave velocity structure and spatial distribution of the seismicity in the source region of the 2016 Kumamoto earthquake sequence. A one-dimensional mean velocity shows that the seismogenic zone has a high-velocity and low-Vp/Vs ratio relative to the average velocity structure of Kyushu Island. This indicates that the crust is relatively strong, capable of sustaining sufficiently high strain energy to facilitate two large (M_j > 6.5) earthquakes in close proximity to one another in rapid succession. Three-dimensional tomography of the seismogenic zone around the source of the 2016 Kumamoto earthquake sequence yields Vp = 6 km/s and Vs = 3.5 km/s. Most large-displacement areas (asperities) of the M_j 7.3 event overlap with the seismogenic zone and the overlying surface layer. Aftershock seismicity is distributed deeper than the conventional seismogenic zone, which suggests decreased strength due to fluids or increased stress, both caused by coseismic slip.

DOI： 10.1002/2017GL074593

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We investigate seismic wave velocity structure and spatial distribution of the seismicity in the source region of the 2016 Kumamoto earthquake sequence. A one-dimensional mean velocity shows that the seismogenic zone has a high-velocity and low-Vp/Vs ratio relative to the average velocity structure of Kyushu Island. This indicates that the crust is relatively strong, capable of sustaining sufficiently high strain energy to facilitate two large (M-j > 6.5) earthquakes in close proximity to one another in rapid succession. Three-dimensional tomography of the seismogenic zone around the source of the 2016 Kumamoto earthquake sequence yields Vp = 6 km/s and Vs = 3.5 km/s. Most large-displacement areas (asperities) of the M-j 7.3 event overlap with the seismogenic zone and the overlying surface layer. Aftershock seismicity is distributed deeper than the conventional seismogenic zone, which suggests decreased strength due to fluids or increased stress, both caused by coseismic slip.

DOI： 10.1002/2017GL074593

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The M-JMA 7.3 Kumamoto earthquake that occurred at 1: 25 JST on April 16, 2016, not only triggered aftershocks in the vicinity of the epicenter, but also triggered earthquakes that were 50-100 km away from the epicenter of the main shock. The active seismicity can be divided into three regions: (1) the vicinity of the main faults, (2) the northern region of Aso volcano (50 km northeast of the mainshock epicenter), and (3) the regions around three volcanoes, Yufu, Tsurumi, and Garan (100 km northeast of the mainshock epicenter). Notably, the zones between these regions are distinctively seismically inactive. The electric resistivity structure estimated from one-dimensional analysis of the 247 broadband (0.005-3000 s) magnetotelluric and telluric observation sites clearly shows that the earthquakes occurred in resistive regions adjacent to conductive zones or resistive-conductive transition zones. In contrast, seismicity is quite low in electrically conductive zones, which are interpreted as regions of connected fluids. We suggest that the series of the earthquakes was induced by a local accumulated stress and/or fluid supply from conductive zones. Because the relationship between the earthquakes and the resistivity structure is consistent with previous studies, seismic hazard assessment generally can be improved by taking into account the resistivity structure. Following on from the 2016 Kumamoto earthquake series, we suggest that there are two zones that have a relatively high potential of earthquake generation along the western extension of the MTL.

DOI： 10.1186/s40623-016-0590-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Seismic activity is associated with crustal stress relaxation, creating inelastic strain in a medium due to faulting. Inelastic strain affects the stress field around a weak body and causes stress concentration around the body, because the body itself has already released stress. Therefore, the understanding of inelastic deformation is important as it generates earthquakes. We investigated average inelastic strain in a spatial bin of Kyushu Island, Japan, and obtained the inelastic strain rate distribution associated with crustal earthquakes, based on the analysis of fault plane solutions and seismic moments. Large inelastic strains (>10^-7 year^-1) were found in the Beppu-Shimabara area, located in the center of Kyushu Island. The strain rate tensor was similar to that of the stress tensor except the absolute value in the area, implying that the inelastic strain was controlled by the stress field. The 2016 Kumamoto earthquake sequence (maximum magnitude 7.3) occurred in the Beppu-Shimabara area, with the major earthquakes located around the high inelastic strain rate area. Inelastic strain in the volume released the stress. In addition, the inelastic strain created an increment of stress around the volume. This indicates that the spatial heterogeneity of inelastic strain might concentrate stress.

DOI： 10.1186/s40623-016-0584-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Seismic activity is associated with crustal stress relaxation, creating inelastic strain in a medium due to faulting. Inelastic strain affects the stress field around a weak body and causes stress concentration around the body, because the body itself has already released stress. Therefore, the understanding of inelastic deformation is important as it generates earthquakes. We investigated average inelastic strain in a spatial bin of Kyushu Island, Japan, and obtained the inelastic strain rate distribution associated with crustal earthquakes, based on the analysis of fault plane solutions and seismic moments. Large inelastic strains (>10-7 year-1) were found in the Beppu-Shimabara area, located in the center of Kyushu Island. The strain rate tensor was similar to that of the stress tensor except the absolute value in the area, implying that the inelastic strain was controlled by the stress field. The 2016 Kumamoto earthquake sequence (maximum magnitude 7.3) occurred in the Beppu-Shimabara area, with the major earthquakes located around the high inelastic strain rate area. Inelastic strain in the volume released the stress. In addition, the inelastic strain created an increment of stress around the volume. This indicates that the spatial heterogeneity of inelastic strain might concentrate stress.

DOI： 10.1186/s40623-016-0584-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The stress field is a key factor controlling earthquake occurrence and crustal evolution. In this study, we propose an approach for determining the stress field in a region using seismic moment tensors, based on the classical equation in plasticity theory. Seismic activity is a phenomenon that relaxes crustal stress and creates plastic strain in a medium because of faulting, which suggests that the medium could behave as a plastic body. Using the constitutive relation in plastic theory, the increment of the plastic strain tensor is proportional to the deviatoric stress tensor. Simple mathematical manipulation enables the development of an inversion method for estimating the stress field in a region. The method is tested on shallow earthquakes occurring on Kyushu Island, Japan.

DOI： 10.1002/2016GL070129

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Non-volcanic tremors were induced by the surface waves of the 2012 Sumatra earthquake around the Hinagu fault zone in Kyushu, Japan. We inferred from dense seismic observation data that the hypocenters of these tremors were located beneath the seismogenic zone of the Hinagu fault. Focal mechanisms of the tremors were estimated using S-wave polarization angles. The estimated focal mechanisms show similarities to those of shallow earthquakes in this region. In addition, one of the nodal planes of the focal mechanisms is almost parallel to the strike direction of the Hinagu fault. These observations suggest that the tremors were triggered at the deeper extension of the active fault zone under stress conditions similar to those in the shallower seismogenic region. A low-velocity anomaly beneath the hypocentral area of the tremors might be related to the tremor activity.

DOI： 10.1186/s40623-015-0346-4

記述言語：英語   掲載種別：研究論文（学術雑誌）  

volcanic tremors were induced by the surface waves of the 2012 Sumatra earthquake around the Hinagu fault zone Kyushu, Japan. We inferred from dense seismic observation data that the hypocenters of these tremors were located beneath the seismogenic zone of the Hinagu fault. Focal mechanisms of the tremors were estimated using S-wave polarization angles. The estimated focal mechanisms show similarities to those of shallow earthquakes in this region. In addition, one of the nodal planes of the focal mechanisms is almost parallel to the strike direction of the Hinagu fault. These observations suggest that the tremors were triggered at the deeper extension of the active fault zone under stress conditions similar to those in the shallower seismogenic region. A low-velocity anomaly beneath the hypocentral area of the tremors might be related to the tremor activity.

DOI： 10.1186/s40623-015-0346-4

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We investigated the spatial variation in the stress fields of Kyushu Island, southwestern Japan. Kyushu Island is characterized by active volcanoes (Aso, Unzen, Kirishima, and Sakurajima) and a shear zone (western extension of the median tectonic line). Shallow earthquakes frequently occur not only along active faults but also in the central region of the island, which is characterized by active volcanoes. We evaluated the focal mechanisms of the shallow earthquakes on Kyushu Island to determine the relative deviatoric stress field. Generally, the stress field was estimated by using the method proposed by Hardebeck and Michael (2006) for the strike-slip regime in this area. The minimum principal compression stress (sigma 3), with its near north-south trend, is dominant throughout the entire region. However, the sigma(3) axes around the shear zone are rotated normal to the zone. This result is indicative of shear stress reduction at the zone and is consistent with the right-lateral fault behavior along the zone detected by a strain-rate field analysis with global positioning system data. Conversely, the stress field of the normal fault is dominant in the Beppu-Shimabara area, which is located in the central part of the island. This result and the direction of sigma 3 are consistent with the formation of a graben structure in the area.

DOI： 10.1186/s40623-015-0342-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： doi:10.1186/s40623-015-0342-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

One approach that can be used to evaluate the potential for an earthquake occurrence is the detection of the stress concentration at an earthquake fault. While the stress fields for pre- and post-seismic event stages differ, this change cannot provide informatibn regarding the potential for an earthquake. Here, we propose a detection method for states of stress that uses focal mechanism data from microearthquakes. The state of stress can be defined both by the background stress and by a moment tensor equivalent to the stress concentration. We applied this method to actual focal mechanism data from the 2013 Awaji Island earthquake (M6.3), japan, and the results showed the presence of stress concentration around the earthquake fault before the mainshock. In addition, the regional differential stress was shown to be about 13 MPa. The magnitude of the obtained stress concentration in the focal area and the high dip angle of the mainshock fault imply that the faulting occurred in the crust where it was overpressurized to a level near the lithostatic pressure. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.tecto.2015.02.023

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Recent studies on the stress field in a seismogenic zone revealed a heterogeneous feature around a fault. To model the stress field around a fault zone, we have developed an inversion method that can be applied to focal mechanism data on microearthquakes and slip data on faults. The modeling scheme takes an objective approach without an a priori model such as the existence of faults or a magma source. The stress variation resulting from inelastic deformation in a medium (e. g., fault slip and magma intrusion) can be expressed as equivalent body forces in the medium. Thus, we attempted to model the stress field through the estimation of parameters of the regional stress and spatially distributed moment sources. The method was applied to the focal mechanism data of the aftershocks of the 2005 Fukuoka earthquake (M7.0) in Japan. The direction obtained for the minimum regional principal stress (i.e., NNW-SSE) was as expected from the general tendency of the focal mechanisms. The results revealed that the stress field was distorted by the fault slip in the middle segment of the earthquake fault. The slip detected at the deep part of the fault is located away from the coseismic slip area, suggesting a possibility of either preseismic or postseismic slip around the initiation point of the main shock rupture. In contrast, the stress accumulation rises at the folding point of the aftershock alignment, and the stress relaxation area is found at the deeper edge where the largest aftershock occurred and strong heterogeneous medium exists.

DOI： 10.1029/2011JB008687

記述言語：日本語  

記述言語：日本語  

記述言語：日本語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have elucidated depth variations in the stress field associated with the 2007 Noto Hanto, Japan, earthquake by stress tensor inversion using high-quality aftershock data obtained by a dense seismic network. Aftershocks that occurred above 4 km in depth indicated a strike-slip stress regime. By contrast, aftershocks in deeper parts indicated a thrust faulting stress regime. This depth variation in the stress regime correlates well with that in the slip direction derived from a finite source model using geodetic data. Furthermore, the maximum principal stress (sigma(1)) axis was stably oriented approximately W20 degrees N down to the depth of the mainshock hypocenter, largely in agreement with the regional stress field, but, below that depth, the s1 axis had no definite orientation, indicating horizontally isotropic stress. One likely cause of these drastic changes in the stress regime with depth is the buoyant force of a fluid reservoir localized beneath the seismogenic zone. Citation: Kato, A., et al. (2011), Anomalous depth dependency of the stress field in the 2007 Noto Hanto, Japan, earthquake: Potential involvement of a deep fluid reservoir, Geophys. Res. Lett., 38, L06306, doi:10.1029/2010GL046413.

DOI： 10.1029/2010GL046413

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：その他   掲載種別：研究論文（学術雑誌）  

High resolution Q-1 estimation based on extension of coda normalization method and its application to P-wave attenuation structure in the aftershock area of the 2005 West Off Fukuoka Prefecture Earthquake (M7.0)

DOI： 10.1111/j.1365-246X.2009.04313.x

記述言語：英語   掲載種別：研究論文（学術雑誌）  

An active seismic survey with unprecedented density of seismometers found a high velocity zone to the west of the summit of Asama Volcano. Japan. The high velocity zone coincides with an area of magma-filled crack (dike) intrusion associated with the 2004 eruptions inferred from precise earthquake relocations and ground deformation modeling. It also coincides with an area of high resistivity surrounded by low resistivity, indicating that the solidification of magma due to repeating intrusions is responsible for the high velocity. This thus endorses the magma pathway previously speculated by seismic and geodetic observations. These findings demonstrate that dense seismic exploration combined with geophysical monitoring is an effective way to understand the dynamics of volcanic eruptions. (c) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jvolgeores.2009.09.004

記述言語：日本語  

Recent observational studies about structure of the earth by using scattered waves provided us with knowledge that elastic parameters like a velocity in the earth's crust and upper mantle are heterogeneous in the range from few tens meter to kilometer scale. In addition, the heterogeneity varies from region to region with 3-4 orders in mean free path. Especially, in volcanic area, the scattering strength becomes extremely strong. In this review, we introduce researches for small scale heterogeneities. There are two major approaches to estimate it. One is analysis of envelope around direct wave arrival. Most of the studies are based on Markov approximation. The method can solve relatively longer scale length than wavelength of seismic waves. Another is in coda part using backward scattered waves. For this analysis, there are models depending on strength of heterogeneity (i.e., single-, multiple-scattering, and diffusion models). Based on the models, many studies have estimated relative scattering strength by using data in regional seismic network and/or seismic array. Spectral structure of heterogeneous property in short wavelength is useful to get character of a medium. Various approaches for scattered wave provide the spectral structure in wide wave number range. This may help us to understand mechanism of earthquake occurrence and volcanic eruption.

DOI： 10.4294/zisin.61.209

掲載種別：研究論文（大学，研究機関等紀要）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The 2004 Mid-Niigata prefecture Earthquake (Mjma 6.8) Occurred in the region of large strain rates (>0.1 ppm/y contraction) in the intraplate region in Japan. The mainshock was followed by four major aftershocks with Mjma >= 6.0. The hypocenters of the mainshock and two large aftershocks that occurred in the central part of the aftershock region were located near the lower limit of the earthquake distribution. while hypocenters of the other two aftershocks near both ends, are located near its Upper limit. Furthermore, the fault Planes Of the latter two aftershocks were confined within the upper half of the upper Crust. Also, the lower limit of the aftershock distribution is deepest in the central part and becomes shallower toward the NNE and SSW ends. These data can be explained by the hypothesis that a localized stress concentration Occurred near the bottom of the seismogenic region only in the central part. The stress concentration may be generated by the deformation in the very weak region of low strength in the lower crust beneath the central part of the aftershock region. (C) 2008 Elsevier B.V. All rights reserved

DOI： 10.1016/j.pepi.2008.10.014

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語  

記述言語：日本語   掲載種別：研究論文（大学，研究機関等紀要）  

application/pdf

DOI： 10.15083/0000032457

記述言語：日本語  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Spatial distribution of static stress drops for aftershocks of the 2005 West off Fukuoka Prefecture earthquake
Iio, Y., H. Katao, T. Ueno, B. Enescu, N. Hirano, T. Okada, N. Uchida, S. Matsumoto, T. Matsushima, K. Uehira, and H. Shimizu
Earth Monthly, Vol.29，No.2，123-127，2007

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Generating Process of the 2004 Mid Niigata Prefecture Earthquake-Based on the Results from the Joint Online Aftershock Observation-
Iio, Y., S. Matsumoto, T. Matsushima, K. Uehira, H. Katao, S. Ohmi, T. Shibutani, F. Takeuchi, K. Nishigami, B. Enescu, I. Hirose, Y. Kano, Y. Mamada, M. Miyazawa, K. Tatsumi, H. Wada, Y. Kohno, M. Korenaga, T. Ueno and Y. Yukutake
Zisin2, Vol.58, No.4, 463-475, 2006

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Generating Process of the 2004 Mid Niigata Prefecture Earthquake : Based on the Results from the Joint Online Aftershock Observation

DOI： 10.4294/zisin1948.58.4_463

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Both the number density of scatterers and scattering strength are parameters characterizing the inhomogeneity of the Earth's crust. An attempt is made to estimate the number density of scatterers (n-value) using small-aperture seismic array data. Many estimates of scattering coefficients have been made previously
however, in a medium with a scattering strength, the wave energy scattered by a medium containing strong scatterers with a low number density is identical to that produced by a high density of weak scatterers. Knowledge of the number density besides the scattering strength supplies important information on stress concentration in the crust due to the strong scatterer reflecting strong inhomogeneity. Therefore, the number density of scatterers is estimated with array signal processing. A seismic array can decompose the approach direction of scattered waves arriving at the array. With array processing, it is not only possible to estimate the energy arriving at the array, but also the semblance value. Temporal variation of the energy depends strongly on the scattering coefficient. On the other hand, the difference in number density of the medium appears in the temporal variation of the semblance value. As a first-order approximation, the semblance value is inversely proportional to the n-value. For practical purposes, an array response should be considered for n-value estimation. Comparing simulated and observed semblances, number density and scattering strength can be estimated from the time sequence of semblances and stacking power. This method was applied to seismic array data from the aftershock area of the 2000 Western Tottori earthquake (Mw 6.8). A rough estimate of number density, compared to a simulation, is 3 × 10-2 km-3. © 2005 RAS.

DOI： 10.1111/j.1365-246X.2005.02773.x

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語  

Mapping of seismic reflectors in and around of Ota earthquake fault, Akita, Japan
Yamashita, M., K. Sato, T. Tsutsui, and S. Matsumoto

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（大学，研究機関等紀要）  

Seismic exploration using artificial sources was conducted at Usu volcano, Japan in November,2001 by 58 participants from nine national universities, Japan Meteorological Agency, Japan Nuclear Cycle Development, and Institute of Physical and Chemical Research to investigate subsurface seismic structures. The exploration was the eighth joint experiment under the National Project for Prediction of Volcanic Eruptions. A total of 288 temporal stations equipped with a 2Hz vertical component seismometer and a portable data logger were deployed in and around Usu volcano and Toya caldera. Dynamite shots with charges of 200-250kg were detonated at seven locations andseismic signals were successfully recorded. To reveal the P-wave velocity structure, first arrivaltimes were picked from the seismograms and 1877 useful arrival times are listed in this paper. From the record sections and the arrival time data, characteristics reflecting the geological structure of the experimental area were identified.

記述言語：日本語  

Seismic exploration at Usu volcano with active sources - The outline of the experiment and the first arrival time data -
ONIZAWA Shin'ya, OSHIMA Hiromitsu, AOYAMA Hiroshi, MORI Hitoshi Y., MAEKAWA Tokumitsu, SUZUKI Atsuo, OKADA Hiromu, TSUTSUI Tomoki, MATSUWO Norimichi, OIKAWA Jun, OHMINATO Takao, YAMAMOTO Keigo, MORI Takehiko, TAIRA Takaaki, MIYAMACHI Hiroki, KOYAMA Junji, YOMOGIDA Kiyoshi, WATANABE Kenji, MATSUBARA Wakana, OKADA Jun, MIYAMURA Jun'ichi, TANIGUCHI Masami, YOSHIKAWA Akifumi, KATOH Kouji, HAMAGUCHI Hiroyuki, TANAKA Satoru, YAMAZAKI Jun, FUJISAWA Hiroatsu, OGAWA Yasuo, NOGAMI Kenji, SAITOH Akira, MIZUHASHI Shoei, WATANABE Hidefumi, KAGIYAMA Tsuneomi, HAGIWARA Michinori, NAKAMICHI Haruhisa, OSADA Noboru, KOYAMA Etsuro, IMOTO Yoshiko, KOBAYASHI Tomokatsu, HIYAMA Youhei, SUGIOKA Manabu, ISHIMINE Yasuhiro, YAMAOKA Koshun, OKUDA Takashi, KOIKE Katsuhiko, SUZUKI Takayuki, TSURUGA Kayoko, SHIMIZU Hiroshi, MATSUMOTO Satoshi, MATSUMOTO Kaoru, OHKURA Takahiro, SAKO Mikio, YOSHIKAWA Shin, YAKIWARA Hiroshi, HIRANO Shuichiro, HAYASHIMOTO Naoki, TAMEGURI Takeshi(2003)
Bulletin of the Earthquake Research Institute, University of Tokyo, 78, 2, 121-143

記述言語：日本語  

Seismic exploration at Iwate volcano with active sources -The outline of the experiment and the first arrival time data-
TANAKA, S., H. HAMAGUCHI, T. YAMAWAKI, T. NISHIMURA, S. UEKI, H. NAKAMICHI, H. MIYAMACHI, T. TSUTSUI, N. MATSUWO, J. OIKAWA, T. OHMINATO, K. MIYAOKA, S. ONIZAWA, T. MORI, K. AIZAWA, H. NAKAHARA, S. HORI, T. SATO, T. KONO, K. NIDA, K. TACHIBANA, T. KAGIYAMA, M. HAGIWARA, N. OSADA, Y. IMOTO, H. TSUJI, H. OKADA, T. MAEKAWA, A. SUZUKI, M. KOSUGA, H. YAMAMOTO, T. SANO, T. OKUDA, K. YAMAMOTO, S. YOSHIKAWA, T. HOKA, S. MATSUMOTO, H. YAKIWARA, S. HIRANO, M. KANAO, K. MAKI, T. KOBAYASHI, Y. KAMIDE, T. TAKAHASHI, K. TSURUGA, M. SATO, H. HASHINO, Y. SUWA, Y. TAKEDA, T. YAMASHITA, U. WEGLER, N. UCHIDA, M. IKEDA, T. TAKAHASHI, T. MAEDA, H. MABUCHI, Y. SENDA, S. AIZAWA, T. KUNO, K. OHTANI, M. YAMASHITA, K. KOBAYASHI, Y. NAGAHAMA, S. HIRAYAMA, S. IWAKIRI, S. ITO, M. YOSHIKAWA, M. NAKAMURA, M. OHSHIMA, and K. MORIWAKI
Bull. Earthq. Res. Inst. Univ. Tokyo, Vol.77, No.1, 1-25, 2002

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Temporal variation of the scatterer distribution has been detected around the focal area of an M6.1 earthquake, northeastern Japan, by applying semblance analysis to seismic array data. The variation was found in slant-stacked waveforms of two explosions detonated just above the focal area one month before and two months after the M6.1 earthquake. According to geodetic observations, a pressure source that might be a magma reservoir exists beneath this region and its location changed during the observation period. Slant-stacked waveforms are slightly different for the two explosions, The difference suggests that a scatterer contributing to the coda part is shifted towards the east and to greater depths only after three months. In this region, seismic and volcanic activity was very active during the interval between the two explosions. The volcanic activity of Mt Iwate just north of the M6.1 earthquake, which started several months beforehand, continued during this period. It may be considered that scatterer change relates to seismic and/or volcanic activity in the studied area.

DOI： 10.1111/j.1365-246X.2001.00339.x

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We discuss the single scattering model by using seismic array data. By analyzing observed seismic array records, we found that coda energy level for slant-stacked record is smaller than that for single station record as expected from the single scattering model. The energy level of slant-stacked waveform is dependent on stacking direction. The energy level variation for different slant-stacking directions suggests that horizontally aligned scatterers predominate over vertical ones. The present analysis is probably useful to detect scattering anisotropy.

DOI： 10.1029/2000GL011766

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

A fine-scale three-dimensional attenuation structure beneath the northeastern Japan are has been obtained using a joint inversion for source parameters, site response and Q values. Data used for this study are P wave spectra of microearthquakes occurring in the subducting Pacific plate. The subducting plate is found to have higher Q values than the overlying mantle. There is an along-are variation in the distribution of low-Q zones in the crust and the mantle wedge within the study area. For the southern part of the study area, low-Q zones are distributed in the crust beneath the volcanic front. They extend into the mantle wedge and become deep toward the west, that is, toward the backarc region. On the other hand, the northern part of the study area has low-Q zones at two depth ranges; at shallower depths just beneath the volcanic front and at the deeper part of the mantle wedge beneath the backarc region. The region without active volcanoes along the volcanic front has relatively high mantle Q values. Seismic activity in the lower plane of the double-planed deep seismic zone is high beneath this relatively high-Q region of the mantle wedge. Spatial distribution of low-Q zones found in the present study is nearly consistent with that of the low-velocity zones estimated from studies of travel times tomography. Partial melting zones in the mantle wedge, whose existence has been suggested from the study of seismic velocity structure and laboratory experiments, are located in the low Q zones obtained in the present study. These results suggest that spatial distribution of Q values is closely related to heterogeneous distribution of temperature in the mantle wedge. (C) 2000 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0040-1951(99)00297-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Spatial distribution of P-wave scatterers in and around the focal area of the 1995 Hyogo-ken Nahbu Earthquake (M7.2) has been estimated by using dense seismic array data. Waveforms of 12 explosions were analyzed in a frequency band of 6-10Hz range. It is difficult to estimate the inhomogeneous structure in this wavelength range from the ordinary travel time tomography, in spite of its importance for understanding earthquake-generating process. Observed waveforms were slant stacked into various directions from the array and then AGC and diffraction curve summation are applied in order to image scatterer distribution. Spatial distribution of scattering strength thus imaged shows that higher strengths are distributed beneath the hypocenter, the initiation point of the mainshock rupture, and in the southwestern part of the fault plane of the event. Copyright 1998 by the American Geophysical Union.

DOI： 10.1029/98GL01090

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Microearthquake Activity in the Nikko-Ashio Area, Western Part of Tochigi Prefecture, Japan

DOI： 10.4294/zisin1948.47.3_287

記述言語：日本語  

Seismic Scatterer Distribution near Focal Area of the 1931 Oguni Earthquake, Iwate Prefecture, Northeastern Japan, as Derived from P Coda Wave Observations of an Explosion by a Dense Seismic Array Network

DOI： 10.4294/zisin1948.46.2_75

記述言語：英語   掲載種別：研究論文（学術雑誌）  

By using a large-capacity marine airgun, we carried out a seismic refraction experiment around the Bandai volcanic area, in the southern part of Tohoku, NE Japan. The analysis of the observed waveform data from the airgun shots shows that the coda wave amplitude is independent of hypocentral distance after a lapse time of about 9 s at any observation site with epicentral distance < 30 km. This fact indicates that most of the coda wave energy, after this lapse time, is distributed homogeneously in the medium beneath the observation sites. It is found that the coda wave amplitude correlates well with the amplitude of the direct P wave of a distant earthquake. The relative site amplification of coda wave amplitude is nearly the same as that of the direct P wave amplitude. Based on this observation, relative site amplification factors can be evaluated by using the coda wave amplitude at each observation site. The inverse coda Q values (Q(c)-1) estimated from the time decays of coda wave amplitudes are about 4.6 X 10(-3), 2.1 X 10(-3) and 1.5 X 10(-3) at 5, 10 and 20 Hz, respectively. The frequency dependence of Q(c)-1 is expressed by a power of frequency in Hz (Q(c)-1 varies as f(n)), where the power n is found to be about -0.8. In the earlier part of the lapse time, the coda wave energy concentrates around the seismic source, which indicates that the scattering effect is very strong in the study area. The shapes of waveform envelopes at 5, 10 and 20 Hz show that the forward scattering factor is stronger at higher frequency than that at lower frequency.

DOI： 10.1016/0031-9201(91)90063-N

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/j.1365-246X.1989.tb02018.x

記述言語：英語   掲載種別：研究論文（学術雑誌）  

開催年月日： 2010年10月

会議種別：口頭発表（一般）  

開催地：広島国際会議場   国名：日本国  

開催年月日： 2010年10月

会議種別：口頭発表（一般）  

開催地：広島国際会議場   国名：日本国  

開催年月日： 2010年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

Matsumoto, S., T. Ohkura, H. Chikura, H. Shimizu, K. Uehira, T. Matsushima, H. Inoue, S. Yoshikawa, Y. Abe, M. Nakamoto, Y. Masaki, M. Miyazaki, and S. Nakao, Stress field in the middle part of Kyushu, Japan and detecting weak zone in the crust, Japan Geoscience Union Meeting 2010, SCG088-11.

開催年月日： 2010年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

Matsumoto, S., T. Matsushima, N. Hirano, M. Nakamoto, Y. Yamashita, N. Itoya, S. Kayahashi1, Y. Sasaki, K. Chiba, H. Chikura, M. Miyazaki, K. Nomura, T. Li, T. Takeda, Y. Asano, K. Obara, and Y. Iio, Seismic array observation at galleries in Nakatatsu mine, Japan Geoscience Union Meeting 2010, STT073-P03.

開催年月日： 2010年5月

会議種別：口頭発表（一般）  

開催地：Vienna   国名：オーストリア共和国  

開催年月日： 2010年2月

会議種別：口頭発表（一般）  

開催地：宮城県   国名：日本国  

開催年月日： 2009年12月

会議種別：口頭発表（一般）  

開催地：サンフランシスコ   国名：アメリカ合衆国  

開催年月日： 2009年10月

会議種別：口頭発表（一般）  

開催地：京都大学   国名：日本国  

開催年月日： 2009年9月

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2009年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

Satoshi Matsumoto, Atsushi Saiga, Kenji Uehira, Takeshi Matsushima, Hiroshi Shimizu Spatial variation of stress field in the middle part of Kyushu Island from stress tensor inversion

開催年月日： 2008年11月

会議種別：口頭発表（一般）  

開催地：つくば市   国名：日本国  

開催年月日： 2008年9月

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2008年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

Estimation of attenuation factor (1/Q) in Philippine Sea plate beneath Bungo-Suido Satoshi Matsumoto, Rizkita Parithusta, Kenji Uehira, Hiroshi Shimizu

開催年月日： 2007年10月

会議種別：公開講演，セミナー，チュートリアル，講習，講義等  

開催地：韓国   国名：大韓民国  

会議種別：口頭発表（一般）  

開催地：San Francisco   国名：アメリカ合衆国  

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Imaging scatterer distribution around aftershock area of the 2000 Western Tottori Earthquake based on seismic array observation Matsumoto, S., K. Obara, H. Kimura, and M. Nakamura The Joint Meeting of Earth and Planetary Science, 2001 Joint Meeting

会議種別：口頭発表（一般）  

開催地：鹿児島県市町村自治会館   国名：日本国  

Estimation of scattering strength distribution around aftershock area of the 2000 Western Tottori Earthquake based on seismic array observation Matsumoto, S., N. Kimura, and M. Nakamura The Seismological Society of Japan, 2001, Fall meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Seismic reflection survey around Unzen Volcano Matsumoto, S., K. Uehira, H. Shimizu, N. Matsuwo, and M. Onishi The Joint Meeting of Earth and Planetary Science, 2002 Joint Meeting

会議種別：口頭発表（一般）  

開催地：仙台市   国名：日本国  

Seismic reflection survey around Unzen Volcano (2) Matsumoto, S., K. Uehira, H. Shimizu, N. Matsuwo, and M. Onishi The Volcanological Society of Japan, 2002, Fall meeting

会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

Estimation of scattering strength distribution based on seismic array observation (2) S. Matsumoto The Seismological Society of Japan, 2002, Fall meeting

会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

Seismic array observation at Minami-Senbongi, Unzen, Japan S.Matsumoto, K. Uehira, N. Matsuwo, M. Nakamura, H. Shimizu, K. Uchida, R. Fukui and K. Obara The Seismological Society of Japan, 2002, Fall meeting

会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

会議種別：口頭発表（一般）  

開催地：幕張メッセ　国際会議場   国名：日本国  

Estimation of scattering strength distribution based on seismic array observation (3) Matsumoto, S. The Joint Meeting of Earth and Planetary Science, 2003 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ　国際会議場   国名：日本国  

Structure of Unzen volcano inferred from seismic reflection survey Matsumoto, S., H. Shimizu, K. Uehira, N. Matsuwo, and M. Onishi The Joint Meeting of Earth and Planetary Science, 2003 Joint Meeting

会議種別：口頭発表（一般）  

開催地：札幌   国名：日本国  

Matsumoto, S. , H. Shimizu, K. Uehira, N. Matsuwo, and M. Onishi, Conduit Imaging For Unzen Volcano, Kyushu, Japan, By Seismic Reflection Survey, International Union Of Geodesy And Geophysics 2003 General Assembly, Sapporo, Japan, V10/01a/D-015.

会議種別：口頭発表（一般）  

開催地：京都国際会舘   国名：日本国  

Detection of crustal inhomogeneities beneath Futagawa-Hinagu fault system by small aperture seismic array observation Matsumoto, S., A, Watanabe, K. Uehira, T. Matsushima, M. Korenaga, and H. Shimizu The Seismological Society of Japan, 2003, Fall meeting

会議種別：口頭発表（一般）  

国名：日本国  

Estimation of scattering strength distribution based on seismic array observation (4) Matsumoto, S. The Joint Meeting of Earth and Planetary Science, 2004 Joint Meeting

会議種別：口頭発表（一般）  

国名：日本国  

Matsumoto, S., Imaging scatterer distribution from small aperture array observation, 1st International Workshop on Active Monitoring in the Solid Earth Gohphysics, Japan.

会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

会議種別：口頭発表（一般）  

国名：大韓民国  

Matsumoto, S., Imaging scatterer distributions from small aperture array observation, The 6th Seminar on the Observation and Analysis of Strong Ground Motion, 25-29 November 2004, Korea.

会議種別：口頭発表（一般）  

国名：日本国  

Matsumoto, S., Estimating scatterer density in the crust by dense seismic array processing, International Workshop on “Probing Earth Media Having Small-Scale Heterogeneities”, 22 November 2004, Japan.

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Imaging crustal inhomogeneity by urgent joint seismic observation of the 2005 west off Fukuoka earthquake (M7.0) Matsumoto, S., M. Hori, A. Watanabe, K. Uehira, K. Goto, H. Katao, N. Hirata, T. Okada, H. Takahashi, H. Shimizu, and M. Korenaga The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Imaging of S-wave reflectors in and around the hypocentral area of the 2004 Niigata-ken Chuetsu Earthquake (M6.8) Matsumoto, S., Y. Iio, T. Matsushima, K. Uehira, and T. Shibutani The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：New Orleans   国名：アメリカ合衆国  

Matsumoto, S., Y. Iio, T. Matsushima, K. Uehira and T. Shibutani, Imaging S wave reflectors in and around hypocentral area of the 2004 Niigata-ken Chuetsu Earthquake (M6.8), 2005 AGU Joint Assembly, S53A-04, 26 May - 3 June 2005, New Orleans, USA. (INVITED)

会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

Imaging S-wave scatterer distribution in south-east part of the focal area of the 2005 West off Fukuoka Prefecture Earthquake (Mjma 7.0) by dense seismic array Matsumoto, S., A. Watanabe, T. Matsushima, H. Miyamachi, and S. Hirano The Seismological society of Japan, 2005, Fall meeting

会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

Simultaneous inversion for both distributions of scatterers and reflectiors Satoshi Matsumoto The Seismological society of Japan, 2005, Fall meeting

会議種別：口頭発表（一般）  

開催地：京都大学宇治キャンパス   国名：日本国  

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Imaging S-wave scatterer distribution around the focal area of the 2005West off Fukuoka Prefecture Earthquake (MJMA7.0) Matsumoto, S., A. Watanabe, K. Uehira, H. Shimizu, T. Kanazawa, H. Miyamachi, M. Shinohara, Y. Iio, T. Okada and H. Takahashi The Joint Meeting of Earth and Planetary Science, 2006 Joint Meeting

会議種別：口頭発表（一般）  

国名：大韓民国  

会議種別：口頭発表（一般）  

開催地：San Francisco   国名：アメリカ合衆国  

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

会議種別：口頭発表（一般）  

開催地：京大防災研究所   国名：日本国  

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

会議種別：シンポジウム・ワークショップ パネル（公募）  

開催地：東京大学地震研究所   国名：日本国  

会議種別：口頭発表（一般）  

開催地：Perugia   国名：イタリア共和国  

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

会議種別：口頭発表（一般）  

開催地：仙台市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：長崎県島原市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：つくば国際会議場   国名：日本国  

Detection of the crustal reflectors around the Hinagu-Fault area, Kumamoto Pref., Kyushu, Japan Matsumoto, S., K. Uehira, T. Matsushima, N. Matsuwo, and H. Shimizu The Seismological Society of Japan, 2000, Fall meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Temporal change of waveform observed by seismic array for explosions before and after M6.1 earthquake of 1998 in Iwate pref. Matsumoto, S., K. Obara, K. Yoshimoto, T. Saito, A. Ito, and A. Hasegawa The Joint Meeting of Earth and Planetary Science, 1999 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Detecting temporal change of waveform from explosion before and after Sizukuishi earthquake (M6.1) using seismic array data (3) Matsumoto, S., K. Obara, K. Yoshimoto, T. Saito, A. Ito, and A. Hasegawa The Joint Meeting of Earth and Planetary Science, 2000 Joint Meeting

開催年月日： 2019年5月 - 2018年5月

記述言語：日本語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2019年3月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：Kyoto   国名：日本国  

開催年月日： 2018年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：郡山市   国名：日本国  

開催年月日： 2018年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：郡山市   国名：日本国  

開催年月日： 2018年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：郡山市   国名：日本国  

開催年月日： 2018年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：郡山市   国名：日本国  

開催年月日： 2018年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：郡山市   国名：日本国  

開催年月日： 2018年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：郡山市   国名：日本国  

開催年月日： 2018年4月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：Vienna   国名：オーストリア共和国  

開催年月日： 2017年8月

会議種別：口頭発表（一般）  

開催地：神戸   国名：日本国  

開催年月日： 2017年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：千葉市   国名：日本国  

開催年月日： 2017年4月

会議種別：口頭発表（一般）  

開催地：ウィーン   国名：オーストリア共和国  

開催年月日： 2016年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：名古屋市   国名：日本国  

開催年月日： 2016年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：千葉市   国名：日本国  

開催年月日： 2015年10月

記述言語：日本語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2015年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：千葉市   国名：日本国  

アブストラクト

開催年月日： 2015年4月

会議種別：口頭発表（一般）  

開催地：ヨーデポリ   国名：スウェーデン王国  

開催年月日： 2014年11月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：朱鷺メッセ（新潟県）   国名：日本国  

開催年月日： 2014年11月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：朱鷺メッセ（新潟県）   国名：日本国  

開催年月日： 2014年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：鹿児島大学（鹿児島県）   国名：日本国  

開催年月日： 2014年4月 - 2014年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

開催年月日： 2014年4月 - 2014年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

開催年月日： 2014年4月 - 2014年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

開催年月日： 2014年4月 - 2014年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

開催年月日： 2014年4月 - 2014年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

開催年月日： 2013年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：千葉市   国名：日本国  

開催年月日： 2013年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：千葉市   国名：日本国  

開催年月日： 2013年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：千葉市   国名：日本国  

開催年月日： 2012年3月

会議種別：口頭発表（一般）  

開催地：東京大学伊藤国際学術研究センター   国名：日本国  

開催年月日： 2011年10月

会議種別：口頭発表（一般）  

開催地：静岡県コンベンションアーツセンター・グランシップ   国名：日本国  

開催年月日： 2011年10月

会議種別：口頭発表（一般）  

開催地：静岡県コンベンションアーツセンター・グランシップ   国名：日本国  

開催年月日： 2011年10月

会議種別：口頭発表（一般）  

開催地：旭川市大雪クリスタルホール   国名：日本国  

開催年月日： 2011年10月

会議種別：口頭発表（一般）  

開催地：旭川市大雪クリスタルホール   国名：日本国  

開催年月日： 2011年9月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2011年9月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2011年6月 - 2011年7月

会議種別：口頭発表（一般）  

開催地：Melbourne   国名：オーストラリア連邦  

開催年月日： 2011年6月 - 2011年7月

会議種別：口頭発表（一般）  

開催地：Melbourne   国名：オーストラリア連邦  

開催年月日： 2011年6月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2011年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

開催年月日： 2011年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

開催年月日： 2011年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

開催年月日： 2011年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

開催年月日： 2011年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

開催年月日： 2011年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

開催年月日： 2011年4月

会議種別：口頭発表（一般）  

開催地：Vienna   国名：オーストリア共和国  

開催年月日： 2011年3月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2011年2月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2011年2月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2011年2月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2011年2月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2010年10月

会議種別：口頭発表（一般）  

開催地：広島国際会議場   国名：日本国  

開催年月日： 2010年10月

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2010年10月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2010年9月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2010年9月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2010年7月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2010年6月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2010年6月

会議種別：口頭発表（一般）  

開催地：福岡市   国名：日本国  

開催年月日： 2010年5月 - 2010年6月

会議種別：口頭発表（一般）  

開催地：テネリフェ   国名：スペイン  

開催年月日： 2010年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

Miyazaki, M., S. Matsumoto, T. Matsushima, K. Uehira, and H. Shimizu, Estimating Vp/Vs ratios near the fault of the 2005 West Off Fukuoka Prefecture Earthquake, Japan Geoscience Union Meeting 2010, SSS021-P04.

開催年月日： 2010年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

Saiga, A., S. Matsumoto, K. Uehira, T. Matsushima, A. Kato, N. Hirata, and H. Shimizu, Low velocity anomaly near bottom of the crust benearth the Kyushu Mountains, Japan Geoscience Union Meeting 2010, SIT035-P02．

開催年月日： 2010年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

Nakamoto, M., S. Matsumoto, T. Matsushima, N. Itoya, S. Kayahashi1, H. Chikura, M. Miyazaki1, K. Uehira, and H. Shimizu, Imaging S-wave scatterer in the focal area of the 2005 West Off Fukuoka Prefecture Earthquake, Japan Geoscience Union Meeting 2010, SSS018-09.

開催年月日： 2010年5月

会議種別：口頭発表（一般）  

開催地：Vienna   国名：オーストリア共和国  

開催年月日： 2010年3月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2010年2月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2009年10月

会議種別：口頭発表（一般）  

開催地：京都大学   国名：日本国  

開催年月日： 2009年10月

会議種別：口頭発表（一般）  

開催地：京都大学   国名：日本国  

開催年月日： 2009年10月

会議種別：口頭発表（一般）  

開催地：文部科学省   国名：日本国  

開催年月日： 2009年10月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2009年8月

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

開催年月日： 2009年8月

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

開催年月日： 2009年8月

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

開催年月日： 2009年7月

会議種別：口頭発表（一般）  

開催地：文部科学省   国名：日本国  

開催年月日： 2009年7月

会議種別：口頭発表（一般）  

開催地：文部科学省   国名：日本国  

開催年月日： 2009年6月

会議種別：口頭発表（一般）  

開催地：Alaska   国名：その他  

開催年月日： 2009年6月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2009年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

開催年月日： 2009年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

Manami Nakamoto, Satoshi Matsumoto Estimation of S-wave scatterer in the focal area of the 2005 West Off Fukuoka Prefecture Earthquake by an earthquake cluster

開催年月日： 2009年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

Rizkita Parithusta, Satoshi Matsumoto, Hiroshi Shimizu, Takeshi Matsushima, Kenji Uehira Frequency & Depth - Dependent Attenuation of SWaves in the PHS Plate, Kyushu, Japan, based on Modified Coda Normalization method

開催年月日： 2009年3月

会議種別：口頭発表（一般）  

開催地：東京大学地震研究所   国名：日本国  

開催年月日： 2009年2月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2008年12月

会議種別：口頭発表（一般）  

開催地：San Francisco   国名：日本国  

開催年月日： 2008年11月

会議種別：口頭発表（一般）  

開催地：つくば市   国名：日本国  

開催年月日： 2008年11月

会議種別：口頭発表（一般）  

開催地：つくば市   国名：日本国  

開催年月日： 2008年11月

会議種別：口頭発表（一般）  

開催地：つくば市   国名：日本国  

開催年月日： 2008年11月

会議種別：口頭発表（一般）  

開催地：つくば市   国名：日本国  

開催年月日： 2008年10月

会議種別：口頭発表（一般）  

開催地：函館市   国名：日本国  

開催年月日： 2008年10月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2008年8月

開催地：Korea Institute of Geoscience and Mineral Resources   国名：大韓民国  

開催年月日： 2008年8月

会議種別：口頭発表（一般）  

開催地：Reykjavik   国名：アイスランド共和国  

開催年月日： 2008年8月

開催地：Reykjavik   国名：アイスランド共和国  

開催年月日： 2008年6月

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

開催年月日： 2008年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

Manten project -Development of seismometer of the next generation- Tsutomu Miura, Yoshihisa Iio, Hiroshi Katao, Takuo Shibutani, Masatoshi Miyazawa, Masato Iguchi, Norio Hirano, Kazuhiro Nishimura, Shiro Ohmi, Kazuro Hirahara, Takahiro Ohkura, Satoshi Matsumoto, Kazunori Takabatake, Yoshikazu Ohashi, Kazuo Furuya

開催年月日： 2008年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

The stress field in the aftershock region of the 2005 West Off Fukuoka Prefecture Earthquake Kenji Uehira, Tomoaki Yamada, Kazuo Nakahigashi, Masanao Shinohara, Satoshi Matsumoto, Takeshi Matsushima, Yoshihisa Iio, Tomomi Okada, Hiroaki Takahashi, Hiroki Miyamachi, Toshihiko Kanazawa, Kazunari Uchida, Hiroshi Shimizu

開催年月日： 2008年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

Crustal velocity structure beneath Unzen volcano Atsushi Saiga, Satoshi Matsumoto, Kodo Umakoshi, Kenji Uehira, Takeshi Matsushima, Hiroshi Shimizu

開催年月日： 2008年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

Estimation Q-1 using the modified coda normalization method Rizkita Parithusta, Satoshi Matsumoto

開催年月日： 2008年5月

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ 国際会議場）   国名：日本国  

A magma chamber model of Unzen Volcano inferred from geodetic and seismic data using FEM and stress tensor inversion method Yuhki Kohno, Satoshi Matsumoto, Takeshi Matsushima, Kenji Uehira, Kodo Umakoshi, Hiroshi Shimizu

開催年月日： 2007年10月

開催地：Baku   国名：アゼルバイジャン共和国  

開催年月日： 2007年6月

会議種別：口頭発表（一般）  

開催地：長崎市   国名：日本国  

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：北海道函館市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Location of crustal reflectors in the Unzen volcanic area Shimizu, H., M. Kuriyama, S. Matsumoto, and T. Matsushima The Joint Meeting of Earth and Planetary Science, 2001 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Seismic array observation at the aftershock area of 2000 Western Tottori Earthquake Obara, K., S. Matsumoto, H. Kimura, and M. Nakamura The Joint Meeting of Earth and Planetary Science, 2001 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Estimation of conversion interfaces by using converted wave in seismograms of intermediate earthquakes beneath the Kyusyu district Nakamura, M., S. Matsumoto, K. Uehira, and H. Shimizu The Joint Meeting of Earth and Planetary Science, 2001 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Estimation of Mono discontinuity by using converted wave in seismograms of intermediate earthquakes beneath the Kyushu district Nakamura, M., K. Uehira, S. Matsumoto, H. Shimizu, and N. Matsuwo The Joint Meeting of Earth and Planetary Science, 2002 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Seismic Experiment on New Mountain formed by the 2000 eruption of Mt. Usu Oshima, H., S. Onizawa, H. Aoyama, S. Matsumoto, Y. Matsubara, T. Tsuchida, and T. Sasaki The Joint Meeting of Earth and Planetary Science, 2002 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Seismic experiment for surveying the volcanic conduit of Unzen Volcano, using controlled sources Shimizu, H., S. Matsumoto, K. Uehira, N. Matsuwo, and M. Onishi The Joint Meeting of Earth and Planetary Science, 2002 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

An application of Pseudo-Reflection Profiling on the shallow structure of Unzen volcano Tsutsui, T., S. Matsumoto, and H. Shimizu The Joint Meeting of Earth and Planetary Science, 2002 Joint Meeting

会議種別：口頭発表（一般）  

開催地：仙台市   国名：日本国  

Reflectors beneath Unzen Volcano Watanabe, A., S. Matsumoto, K. Uehira, and H. Shimizu The Volcanological Society of Japan, 2002, Fall meeting

会議種別：口頭発表（一般）  

開催地：パシフィコ横浜   国名：日本国  

eflectors benearth Unzen Volcano A. Watanabe, S. Matsumoto, K. Uehira and H. Shimizu The Seismological Society of Japan, 2002, Fall meeting

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：幕張メッセ　国際会議場   国名：日本国  

Imaging of reflectors beneath Unzen Volcano using vibratory sources Watanabe, A., S. Matsumoto, N. Matsuwo, K. Uehira, and H. Shimizu The Joint Meeting of Earth and Planetary Science, 2003 Joint Meeting

会議種別：口頭発表（一般）  

開催地：札幌   国名：日本国  

Shimizu, H. , N. Matsuwo, T. Matsushima, K. Uehira, S. Matsumoto, and K. Umakoshi, Seismological Study On The Magma Ascent Path Of Unzen Volcano, International Union Of Geodesy And Geophysics 2003 General Assembly, Sapporo, Japan, V10/01p/A01-006.

会議種別：口頭発表（一般）  

開催地：札幌   国名：日本国  

Watanabe, A., S. Matsumoto, K. Uehira, N. Matsuwo, and H. Shimizu, Fan-Shooting Reflection Profile In Unzen Volcano, International Union Of Geodesy And Geophysics 2003 General Assembly, Sapporo, Japan, V10/01a/D-011.

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：京都国際会舘   国名：日本国  

Detection of Chijiwa fault by using Data of 2001 Seismic Reflection Survey in Unzen Volcano Watanabe, A., and S. Matsumoto The Seismological Society of Japan, 2003, Fall meeting

会議種別：口頭発表（一般）  

開催地：京都国際会舘   国名：日本国  

Three dimensional seismic velocity structure around the Futagawa-Hinagu fault zone, Kyushu, Japan(2) Korenaga, M., H. Shimizu, and S. Matsumoto The Seismological Society of Japan, 2003, Fall meeting

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：京都大学火山研究センター   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

国名：日本国  

Reflectors beneath Unzen Volcano, detected from local earthquakes Watanabe, A., S. Matsumoto, H. Shimizu, N. Matsuwo, and K. Uehira The Joint Meeting of Earth and Planetary Science, 2004 Joint Meeting

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：Honolulu, Hawaii   国名：アメリカ合衆国  

Watanabe, A., S. Matsumoto and H. Shimizu, 2004, Imaging of the scatterer distribution beneath Unzen Volcano, 2004 Western Pacific Geophysics Meeting, S43A-84, Honolulu, Hawaii.

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：Honolulu, Hawaii   国名：アメリカ合衆国  

Shimizu, H., S. Matsumoto, T. Matsushima, N. Matsuwo, K. Uehira, A. Watanabe, Y. Kohno, K. Matsumoto and K. Umakoshi, 2004, Imaging of Magma Supplying System of Unzen Volcano, 2004 Western Pacific Geophysics Meeting, S42A-01, Honolulu, Hawaii.

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：静岡県地震防災センター   国名：日本国  

The deflation of Unzen Volcano inferred from Leveling data Kohno, Y., T. Matsushima, K. Uchida, H. Shimizu, N. Matsuwo, K. Uehira, and S. Matsumoto The Volcanological society of Japan, 2004, Fall meeting

会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

Upper Crustal Structure in Hinagu Fault Area, Kyushu, Japan, by Seismic Refraction/Wide-angle Reflection Profilling Iwasaki, T. and Research Group of 2003 Seismic Expedition for Hinagu Fault Area, Kyushu, Japan The Seismological Society of Japan, 2004, Fall meeting

会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

Imaging scatterers and reflectors distribution based on multi seismic array analysis Watanabe, A. and S. Matsumoto The Seismological Society of Japan, 2004, Fall meeting

会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

Three dimensional seismic velocity structure around the Futagawa-Hinagu fault zone by Double-Difference Tomography Korenaga, M., S. Matsumoto, H. Shimizu, and The Research Group for the 2003 Hinagu Fault Seismic Expedition The Seismological Society of Japan, 2004, Fall meeting

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：San Francisco   国名：アメリカ合衆国  

Chung, T., and S. Matsumoto, Study Of Attenuation Structure Based On The Dense Networks Around South Korea, 2004 AGU Fall Meeting, S53B-0196, 13-17 December 2004, San Francisco, USA.

会議種別：口頭発表（一般）  

開催地：Korea Institute of Geoscience and Mineral Resources   国名：大韓民国  

Korenaga, M., S. Matsumoto and S. Shimizu, Three dimensional seismic velocity structure around the Futagawa-Hinagu fault zone, Kumamoto prefecture, by Double-Difference Tomography, 3rd International Seminar on Seismic Tomography of Far-East Asia and Related Works, 5-7 December 2004, Korea Institute of Geoscience and Mineral Resources.

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：島原復興アリーナ（サブアリーナ）   国名：日本国  

Shimizu, H.，S. Matsumoto, T. Matsushima, K. Uehira, N. Matsuwo, A. Watanabe, Y. Kohno, K. Matsumoto and K. Umakoshi，2005，Imaging of the subsurface structure and magma feeding system of Unzen Volcano，International Workshop on Unzen Scientific Drilling Project (USDP), O-20.

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Estimation of Strong Ground Motion at Genkai-island during the Fukuoka-ken Seiho-oki Earthquake, March 20, 2005. Maeda, T., M. Ichiyanagi, H. Takahashi, M. Kasahara, T. Sasatani, T. Matsushima, and S. Matsumoto The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Urgent joint observation of the 2005 west off Fukuoka earthquake (M7.0) Shimizu, H., H. Takahashi, T. Okada, T. Kanazawa, Y. Iio, H. Miyamachi, T. Matsushima, M. Ichiyanagi, N. Uchida, T. Iwasaki, H. Katao, K. Goto, S. Matsumoto, N. Hirata, S. Nakao, K. Uehira, M. Shinohara, H. Yakiwara, N. Kame, T. Urabe, N. Matsuwo, T. Yamada, A. Watanabe, K. Nakahigashi, B. Enescu, K. Uchida, S. Hashimoto, S. Hirano, T. Yagi, Y. Kohno, T. Ueno, M. Saito, and M. Hori The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Stress patterns of Hinagu fault region, Kumamoto, Japan, revealed by a stress tensor inversion method Uehira, K., M. Korenaga, S. Matsumoto, K. Uchida, N. Matsuwo, T. Matsushima, and H. Shimizu The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Three dimensional velocity structure around aftershock area of the 2004 Niigata-ken Chuetsu Earthquake (M6.8) by the DD tomography Korenaga, M., S. Matsumoto, Y. Iio, T. Matsushima, K. Uehira, and T. Shibutani The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Generation Process of the 2004 Niigata-Chuetsu Earthquake and its Major Aftershocks Inferred from Aftershock Distributions Iio, Y., S. Matsumoto, H. Katao, T. Matsushima, S. Ohmi, T. Shibutani, F. Takeuchi, K. Uehira, K. Nishigami, B. Enescu, I. Hirose, Y. Kano, Y. Kohno, M. Korenaga, Y. Mamada, M. Miyazawa, K. Tatsumi, T. Ueno, H. Wada, and Y. Yukutake The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Triggering Sequence by Static Stress Changes of Large Aftershocks of the Niigata-Chuetsu, Japan Earthquake Miyazawa, M., J. Mori, Y. Iio, T. Shibutani, S. Matsumoto, H. Katao, S. Ohmi, and K. Nishigami The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Aftershock distribution of the 2004 Niigata-Chuetsu Earthquake (Mj = 6.8) and heterogeneous structure in the source region Shibutani, T., Y. Iio, S. Matsumoto, H. Katao, T. Matsushima, S. Ohmi, F. Takeuchi, K. Uehira, K. Nishigami, B. Enescu, I. Hirose, Y. Kano, Y. Kohno, M. Korenaga, Y. Mamada, M. Miyazawa, K. Tatsumi, T. Ueno, H. Wada, and Y. Yukutake The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Small Scale Heterogeneity beneath Unzen Volcano by Seismic Wave Analysis Watanabe, A., and S. Matsumoto The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：地球惑星科学関連学会2005年合同大会   国名：日本国  

Upper and middle crustal structure in and around the Hinagu fault system, Kyushu, Japan Iwasaki, T. and The Research Group for the 2003 Hinagu Fault Seismic Expedition The Joint Meeting of Earth and Planetary Science, 2005 Joint Meeting

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：Menlo Park   国名：アメリカ合衆国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：Menlo Park   国名：アメリカ合衆国  

Iio, Y., T. Shibutani, S. Matsumoto and T. Okada, The 2004 Niigata-Chuetsu earthquake: Four short talks, USGS Earthquake Hazards Team Seminar, 1 June 2005, Menlo Park, USA. (INVITED)

会議種別：口頭発表（一般）  

開催地：New Orleans   国名：アメリカ合衆国  

Miyazawa, M., J. J. Mori, Y. Iio, T. Shibutani, S. Matsumoto, H. Katao, S. Ohmi and K. Nishigami, Triggering Sequence by Static Stress Changes of Large aftershocks of the Niigata-Chuetsu, Japan Earthquake, 2005 AGU Joint Assembly, S53A-06, 26 May - 3 June 2005, New Orleans, USA.

会議種別：口頭発表（一般）  

開催地：New Orleans   国名：アメリカ合衆国  

Shibutani, T., Y. Iio, S. Matsumoto, H. Katao, T. Matsushima, S. Ohmi, F. Takeuchi, K. Uehira, K. Nishigami, B. Enescu, I. Hirose, Y. Kano, Y. Kohno, M. Korenaga, Y. Mamada, M. Miyazawa, K. Tatsumi, T. Ueno, H. Wada and Y. Yukutake, Aftershock Distribution of the 2004 Niigata-Chuetsu Earthquake (Mj = 6.8) and Heterogeneous Structure in and Around the Source Region, 2005 AGU Joint Assembly, S53A-05, 26 May - 3 June 2005, New Orleans, USA.

会議種別：口頭発表（一般）  

開催地：New Orleans   国名：アメリカ合衆国  

Iio, Y., S. Matsumoto, H. Katao, T. Matsushima, S. Ohmi, T. Shibutani, T. Takeuchi, K. Uehira, K. Nishigami, B. Enescu, I. Hirose, Y. Kano, Y. Kono, M. Korenaga, Y. Mamada, M. Miyazawa, T. Tatsumi, T. Ueno, H. Wada and Y. Yukutake, Generation process of the 2004 Niigata-Chuetsu earthquake and its major aftershocks inferred from aftershock distributions, 2005 AGU Joint Assembly, S53A-01, 26 May - 3 June 2005, New Orleans, USA.

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

Upper and Middle Crustal Structure in and around the Hinagu Fault System, Kyushu, Japan, II Iwasaki, T. and Research Group for the 2003 Hinagu Fault Seismic Expedition The Seismological society of Japan, 2005, Fall meeting

会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

Spatial distribution of the stress drops of the aftershocks of the 2005 West-off of the Fukuoka Prefecture earthquake Iio, Y., H. Katao, T. Ueno, B. Enescu, N. Hirano, T. Okada, N. Uchida, K. Uehira, S. Matsumoto, T. Matushima, and H. Shimizu The Seismological society of Japan, 2005, Fall meeting

会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

Shear wave anisotropy in and around the focal region of the 2005 West Off Fukuoka Earthquake Watanabe, A., S. Matsumoto, T. Matsushima, K. Uehira, N. Matsuwo, and H. Shimizu The Seismological society of Japan, 2005, Fall meeting

会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

3D seismic velocity structure model in and around the focal area of the 2005 west off Fukuoka prefecture earthquake Hori, M., S. Matsumoto, K. Uehira, T. Okada, T. Yamada, Y. Iio, M. Shinohara, H. Miyamachi, H. Takahashi, K. Nakahigashi, A. Watanabe, T. Matsushima, N. Matsuwo, T. Kanazawa, and H. Shimizu The Seismological society of Japan, 2005, Fall meeting

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：Quito   国名：エクアドル共和国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Imaging of the subsurface structure and magma supplying system of Unzen Volcano Shimizu, H., S. Matsumoto, A. Watanabe, T. Matsushima, K. Uehira and N. Matsuwo The Joint Meeting of Earth and Planetary Science, 2006 Joint Meeting

会議種別：口頭発表（一般）  

開催地：幕張メッセ国際会議場（千葉市）   国名：日本国  

Shear wave polarization anisotropy in and around the focal region of the 2005 West off Fukuoka Prefecture earthquake (2) Watanabe, A. and S. Matsumoto The Joint Meeting of Earth and Planetary Science, 2006 Joint Meeting

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：名古屋市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：名古屋市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：国土地理院   国名：日本国  

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

Active source seismic experiment in Asama Volcano, Japan Aoki, Y., M. Takeo, H. Aoyama, J. Fujimatsu, S. Matsumoto, H. Miyamachi, H. Nakamichi, T. Ohkura, T. Ohminato, J. Oikawa, R. Tanada, T. Tsutsui, K. Yamamoto, M. Yamamoto, H. Yamasato, T. Yamawaki

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

会議種別：口頭発表（一般）  

開催地：千葉市（幕張メッセ国際会議場）   国名：日本国  

会議種別：口頭発表（一般）  

国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：仙台市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：仙台市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：仙台市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：口頭発表（一般）  

開催地：長崎県島原市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：長崎県島原市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：長崎県島原市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：長崎県島原市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：長崎県島原市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：長崎県島原市   国名：日本国  

会議種別：口頭発表（一般）  

開催地：San Francisco   国名：アメリカ合衆国  

会議種別：口頭発表（一般）  

開催地：気象庁   国名：日本国  

会議種別：シンポジウム・ワークショップ パネル（公募）  

開催地：熊本   国名：日本国  

記述言語：英語   会議種別：口頭発表（一般）  

国名：オーストリア共和国  

Volcanic tremors are seismic indicators providing clues for magma behavior, which is related to volcanic eruptions and activity. Detection of spatial and temporal variations of volcanic tremors is important for understanding the mechanism of volcanic eruptions. However, temporal variations of tremor activity in short-term than a minute have not been previously detected by seismological observations around volcanoes. Here, we show that volcanic tremor sources were activated at the top of the conduit (i.e. the crater) and at its lower end by analyzing seismograms from a dense seismic array during the 2011 Kirishima eruption. We observed spasmodic switching in the seismic ray direction during a volcanic tremor sequence. Such fine volcanic tremor structure suggests an interaction between tremor sources located in both deep and shallow depths. Our result suggests that seismic array observations can monitor the magma behavior and contribute to the evaluation of the activity’s transition

記述言語：日本語  

国名：日本国  

２００５年３月に発生した福岡県西方沖地震の震源域においては，地震発生後に稠密な地震観測網が展開された．これらのデータを用い，Matsumoto et al. (2012)は広域応力とモーメントテンソルを用いて応力場不均質の検出を行った．彼らの結果によると，断層深部破壊開始点付近に本震のモーメントの数割に相当する滑りが発生していることが明らかになった．余震を用いたこの推定は本震発生後の応力場を反映しているものであり，現在もなお，この滑りの影響が残っていることを示している．ＧＰＳを用いた本震や余効変動モデルによると，この滑りは本震時もしくは発生後のものではないことを示している．これは地震前に滑りを起こしたことを示唆しており，地震発生前の滑りが本震破壊開始点付近で発生し，本震の破壊を引き起こす要因の一つとなった可能性がある． GPSの連続記録には地震発生前に短期的な滑りは見いだせないものの，やや長周期の変動が発生しており，この地震前変動が寄与している可能性が考えられる

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Seismic Experiment on the Nishiyama New Mountain formed by the 2000 eruption of Mt. Usu Oshima, H., S. Matsumoto, Y. Matsubara, S. Onizawa, H. Okada, M. Nakamura, N. Matsuwo, H. Shimizu, Y. Hasimoto, and T. Tsuchida The Joint Meeting of Earth and Planetary Science, 2001 Joint Meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Shallow seismic reflection profiling across the Ota fault Sato K., S. Matsumoto, T. Tsutsui, M. Yamashita, and J. Sugi The Joint Meeting of Earth and Planetary Science, 2000 Joint Meeting

会議種別：口頭発表（一般）  

開催地：つくば国際会議場   国名：日本国  

Detection of reflectors beneath Unzen Volcano Kuriyama, M., H. Shimizu, T. Matsushima, and S. Matsumoto The Seismological Society of Japan, 2000, Fall meeting

会議種別：口頭発表（一般）  

開催地：つくば国際会議場   国名：日本国  

Seismic Activity at the Northern End of Hinagu-Fault in the Kumamoto Prefecture, Kyushu District Uehira, K., N. Matsuwo, T. Matsushima, S. Matsumoto, K. Uchida, R. Fukui, M. Kuriyama, and H. Shimizu The Seismological Society of Japan, 2000, Fall meeting

会議種別：口頭発表（一般）  

開催地：代々木国立オリンピック記念青少年総合センター   国名：日本国  

Shallow structure of the Ota fault, a part of the Senya faults, revealed by seismic reflection and geological surveys Sato K., T. Tsutsui, S. Matsumoto, M. Yamashita, and K. Kobayashi The Joint Meeting of Earth and Planetary Science, 2001 Joint Meeting

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Precise aftershock distribution of the 2005 West off Fukuoka Prefecture Earthquake and crustal structure in and around the source region
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, Eathquake Research Institute, University of Tokyo, Faculty of Science, Kagoshima University, Disaster Prevention Research Institute, Kyoto University, Faculty of Science, Hokkaido University
Rep. Coord. Comm. Earthq. Pred., vol.75, 546-552, 2006

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Seismic Activity in Kyushu (Nov., 2004 - Oct., 2005)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.75, 532-540, 2006

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Seismic Activity in Kyushu (May, 2004 - October, 2004)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.73, 595-599, 2005

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Volcanic Activity of Unzen Volcano (June 2004 ? September 2004)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.89, 82-87, 2005

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Aftershock distribution of the 2004 Niigata-Chuetsu earthquake
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.73, 332-340, 2005

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Primary results of GPS observation of the postseismic deformations following the 2004 Mid Niigata Earthquake
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.73, 380-383, 2005

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Volcanic Activity of Unzen Volcano (February 2004 ? May 2004)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.88, 111-121, 2004

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Volcanic Activity of Unzen Volcano (Oct., 2003 - Jan., 2004)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.87, 97-104, 2004

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Seismic Activity in Kyushu (November, 2003 - April, 2004)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.72, 592-597, 2004

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Volcanic Activity of Unzen Volcano (May, 2003 - Sep., 2003)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.86, 95-101, 2004

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Seismic Activity in Kyushu (Nov., 2002 - Oct., 2003)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.71, 707-715, 2004

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Fumarolic activity at the eastern flank of Unzen Volcano
nstitute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.85, 104-105, 2003

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Volcanic Activity of Unzen Volcano (Oct., 2001 - Apr., 2003)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.85, 97-103, 2003

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Seismic Activity in Kyushu (May, 2002 - Oct., 2002)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.69, 501-509, 2003

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Seismic Activity in Kyushu (Nov., 2001 - Apr., 2002)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Earthq. Pred., vol.68, 459-468, 2002

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Volcanic Activity of Unzen Volcano (Jun., 2001 - Sep., 2001)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.80, 84-88, 2002

記述言語：日本語   掲載種別：機関テクニカルレポート，技術報告書，プレプリント等  

Volcanic Activity of Unzen Volcano (Feb., 2000 - May, 2001)
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
Rep. Coord. Comm. Pred. Volcanic Erup., No.79, 139-145, 2002

種別：査読等 

外国語雑誌　査読論文数：2

種別：大会・シンポジウム等 

種別：大会・シンポジウム等 

種別：大会・シンポジウム等 

種別：審査・学術的助言 

種別：審査・学術的助言 

種別：審査・学術的助言 

種別：審査・学術的助言 

種別：大会・シンポジウム等 

種別：大会・シンポジウム等 

種別：審査・学術的助言 

種別：審査・学術的助言 

種別：審査・学術的助言 

種別：大会・シンポジウム等