記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1007/s00445-023-01656-x

その他リンク： https://doi.org/10.1007/s00445-023-01656-x

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Earth, Planets and Space  

From April to July 2021, West Crater at Iwo-Yama, Kirishima Volcanic Complex, Japan, was repeatedly filled with hydrothermal water and subsequently evacuated. The overall cycle lasted 14–70 h, and the course of a single cycle followed this sequence of phases: (i) steam effusion disappeared 20–40 min before hydrothermal water discharge; (ii) hydrothermal water discharge occurred, generating a hydrothermal water pool; (iii) steam effusion resumed and gradually increased; and (iv) drain-back (evacuation) of the hydrothermal water occurred 1–1.5 h before the onset of the next hydrothermal water discharge. We used multi-parametric observations (optical camera, thermometer, electric self-potential (SP) electrodes, seismometer, acoustic sensor, and tiltmeter) to investigate the cause of the cyclic hydrothermal water discharge. A change in SP data occurred approximately 2 h before the onset of hydrothermal water discharge. However, the change in SP was small when hydrothermal water discharge did not occur. The temporal change in SP is inferred to have been caused by groundwater flow through the region below West Crater, implying that groundwater flow was occurring 2 h before hydrothermal water discharge. The polarity of SP change suggests that groundwater flowed toward the region underlying the vents. Seismic signals in the frequency range of < 20 Hz decreased 15–45 min after the onset of change in SP. This seismic signal pattern is inferred to have been caused by bubble activity in boiling fluid. We interpret that the inflow of cold groundwater inhibited boiling activity in the conduit, which in turn caused the cessation of both steam effusion and seismic activity. SP data suggest that the inflow of cold groundwater gradually decreased before hydrothermal water discharge. Pressurization sufficient to force the water in the upper part of the conduit to ascend could have built up in the lower part of the conduit owing to a decrease in the input of groundwater into the upper part of the conduit and the continuing supply of steam bubbles and hot water. This increase in pressure finally led to hydrothermal water discharge at the surface. We suggest that the inflow of cold groundwater into the geyser conduit was the key control on the occurrence and cyclicity of hydrothermal water discharge in West Crater at Iwo-Yama. Graphical Abstract: [Figure not available: see fulltext.]

DOI： 10.1186/s40623-023-01830-7

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1186/s40623-023-01830-7

その他リンク： https://doi.org/10.1186/s40623-023-01830-7

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1093/gji/ggad126

その他リンク： https://doi.org/10.1093/gji/ggad126

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Geophysical Journal International  

Unzen volcano, located on Shimabara Peninsula, Nagasaki, Japan, is an active volcano that has been intensively monitored since 1989, one year before the most recent eruption in 1990-1995. Previous earthquake and surface deformation studies have revealed that magma is transported obliquely from a magma reservoir beneath Tachibana Bay, to the west of Shimabara Peninsula. Here, we conduct broad-band magnetotelluric (MT) surveys at 99 sites around Shimabara Peninsula to investigate the crustal structure beneath Unzen volcano that is related to magma migration. A 3-D resistivity model that is constructed from 25 broad-band MT sites and 45 telluric sites shows a broad high-resistivity zone beneath Shimabara Peninsula and low-resistivity zones to the west and east of the peninsula. An unexpected observation is the spatial alignment of the high-resistivity zone with a seismic low-velocity zone (LVZ) at 3-15 km depth. Quantitative analysis indicates this high-resistivity zone contains < 0.7 per cent melt under the assumption that the melt is stored in a good porosity network, while < 11 per cent melt in relatively poor pore network. We infer this high-resistivity, LVZ to be a highly crystallized mush zone (HCMZ) with low permeability. The hypocentres and pressure sources of the 1990-1995 eruption are distributed along the boundary between the high- and low-resistivity zones beneath the western part of the peninsula. We therefore conclude that the magma migrated along a structural boundary that possessed a relatively high permeability. Previous studies have suggested that eruptible magma is usually transported vertically upward through the centre of the mush zone, whereas the present results reveal that magma can be transported along the upper boundary of an HCMZ.

DOI： 10.1093/gji/ggad126

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

We derived the thermal structure of the Kuju region of volcanic activity in central Kyushu, Japan, to assess the potential existence of a supercritical geothermal system. Extrapolation of existing well-logging data suggests the presence of a high-temperature region beneath the area between the Hatchobaru geothermal power plant and Kuju-Iwoyama Volcano, which closely overlaps a low-resistivity body estimated from magnetotelluric data. Based on estimated temperatures exceeding 380 °C at the relatively shallow depth of -3.3 km above sea level, and considering evidence for magmatic fluid transport, this high-temperature region is a potential target for a supercritical geothermal reservoir.

DOI： 10.1016/j.geothermics.2022.102602

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.geothermics.2022.102602

その他リンク： https://doi.org/10.1016/j.geothermics.2022.102602

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Communications Earth and Environment  

It is difficult to forecast phreatic eruptions because they are often characterised by an abrupt onset at shallow depths beneath volcanoes. Here we show that temporal changes in the tilt, tremor, and horizontal electric field have occurred repeatedly near the vent of a small phreatic eruption at Iwo-Yama, Kirishima Volcanic Complex, Japan. Such geophysical changes were observed 13 times, with one of these events occurring immediately before the onset of the 2018 phreatic eruption. These observations suggest that shallow hydrothermal intrusions, which are observed as tilt changes with tremors, commonly induce near-surface cold groundwater flow, which is observed as electric-field changes. Near-surface groundwater flows towards the active vent, potentially inhibiting a phreatic eruption. However, explosive phreatic eruptions occur when the intrusion is shallow and cold groundwater flow is depleted. The near-surface groundwater is key in controlling the occurrence of phreatic eruptions and can be monitored using electric-field measurements.

DOI： 10.1038/s43247-022-00515-5

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

It is difficult to forecast phreatic eruptions because they are often characterised by an abrupt
onset at shallow depths beneath volcanoes. Here we show that temporal changes in the tilt,
tremor, and horizontal electric field have occurred repeatedly near the vent of a small phreatic
eruption at Iwo-Yama, Kirishima Volcanic Complex, Japan. Such geophysical changes were
observed 13 times, with one of these events occurring immediately before the onset of the
2018 phreatic eruption. These observations suggest that shallow hydrothermal intrusions,
which are observed as tilt changes with tremors, commonly induce near-surface cold
groundwater flow, which is observed as electric-field changes. Near-surface groundwater
flows towards the active vent, potentially inhibiting a phreatic eruption. However, explosive
phreatic eruptions occur when the intrusion is shallow and cold groundwater flow is depleted.
The near-surface groundwater is key in controlling the occurrence of phreatic eruptions and
can be monitored using electric-field measurements.

DOI： https://doi.org/10.1038/s43247-022-00515-5

その他リンク： https://www.nature.com/articles/s43247-022-00515-5

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Geophysical Research Letters  

Shinmoe-dake volcano, which is within the Kirishima volcanic complex, Japan, erupted from March to June 2018. The eruptions were recorded by various geophysical instruments that were installed 3.1–5.4 km from the crater. Here we present the first documented evidence of infrasound-induced electric-field changes in the near surface at the time of the explosive eruptions. Significant electric-field changes coincide with the infrasound arrivals. An order-of-magnitude estimation of the electric field indicates that the electrokinetic mechanism induced by pore water movement relative to the host rock, is a plausible cause of the observed infrasound–electric-field coupling. The ground displacement and electric-field particle motions suggest that the infrasound waves from the explosive eruptions produce vertical ground motion, and simultaneously induce horizontal groundwater flow, which subsequently generates electric-field changes due to the propagation of the infrasound wave.

DOI： 10.1029/2021GL096555

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出版者・発行元：Geophysical Journal International  

Magnetotelluric (MT) observations have revealed subvertical electrical conductors that extend from shallow depths into the mid-crust at various geothermal zones, active volcanoes and active faults worldwide. These deeply rooted subvertical conductors have typically been interpreted to represent entire zones of dedicated fluid transport through the crust. We estimate the high-resolution 3-D crustal resistivity structure below the Kuju Volcanoes, Japan, using dense observations from 153 broad-band MT measurement sites and 40 telluric measurement sites. The resistivity structure highlights subvertical conductors that merge into a deep conductor to the north of the volcanoes, with deep low-frequency earthquakes occurring near the southeastern edge of this subvertical conductor at 10-30 km depth. This deep conductor branches into several subvertical conductors at 2-10 km depth, coinciding with a shallow zone where tectonic earthquakes rarely occur. The surface expressions of active geothermal areas and past volcanic eruptions are all located above the edges of the conductors at 2-6 km depth. Widespread conductive layers exist around the volcanoes above 2 km depth, and their distribution approximately corresponds to a low-gravity-anomaly zone. We discuss the nature of these subvertical conductors, the potential causes of their complex structure and their relationship to local magmatic fluid transport. These subvertical conductors, a shallow clay-rich layer, developed fracture systems and high-strength solidified magma may all contribute to magmatic fluid transport to the surface at the Kuju Volcanoes. In this study, we add the possibility that the edges of these subvertical conductors act as important magmatic fluid pathways.

DOI： 10.1093/gji/ggab368

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1029/2021GL096555

その他リンク： https://doi.org/10.1029/2021GL096555

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1038/s41598-021-00481-6

その他リンク： https://doi.org/10.1038/s41598-021-00481-6

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/ggab368

その他リンク： https://doi.org/10.1093/gji/ggab368

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1029/2021JB022034

その他リンク： https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021JB022034

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1029/2020JB020904

その他リンク： https://doi.org/10.1029/2020JB020904

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1186/s40623-020-01340-w

その他リンク： https://link.springer.com/article/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/10.1016/j.jvolgeores.2020.107066

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.jvolgeores.2020.106898

その他リンク： https://www.sciencedirect.com/science/article/pii/S0377027319305414

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1186/s40623-019-1122-7

その他リンク： https://link.springer.com/article/10.1186%2Fs40623-019-1122-7

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1186/s40623-019-1004-z

その他リンク： https://earth-planets-space.springeropen.com/articles/10.1186/s40623-019-1004-z

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2018GL079898

その他リンク： https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GL079898

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Abstract Iwo-yama volcano, part of the Kirishima Volcanic Complex, has recently shown signs of unrest.
We conducted a hypocenter relocation of shallow earthquakes and broadband magnetotelluric
measurements around Iwo-yama. Three-dimensional inversion of magnetotelluric data revealed an
electrically conductive layer that is interpreted as a hydrothermally altered clay-dominated unit. Shallow
earthquakes occur beneath this layer, suggesting that it controls the location of seismicity. The base of the
layer corresponds to the depth of a pressure source identified by a leveling survey. These observations
suggest that the supply of high-temperature fluids has increased over time beneath Iwo-yama, causing an
increase in pore pressure beneath the clay-rich layer and resulting in tectonic earthquakes and ground
inflation. Increased upwelling of fluids through a fracture in the clay-rich layer may have caused a vigorous
liquid-gas phase transition near the surface, which in turn might have led to the small phreatic eruption on 19
April 2018.

Plain Language Summary
Phreatic eruptions result from the sudden release of pressurized fluid
into the air. Imaging the pressurized region is important to predict future phreatic eruptions. We studied
Iwo-yama volcano, Kirishima, Japan, where recent volcanic unrest has led to a small phreatic eruption. By
imaging the subsurface electrical resistivity structure using the magnetotelluric technique, we have identified
a low-permeability clay-rich layer at depths of 200–700 m below the surface. Earthquake hypocenters and
one of the sources of surface uplift are located beneath this clay layer, so we conclude that the layer caps
deep hydrothermal fluids and allows the buildup of pressure beneath it. If this clay-rich layer suddenly breaks,
or if the fluid supply through the deeper conductor suddenly increases, a larger phreatic eruption could occur
in the future. Imaging and monitoring of such clay-rich layers is important to our understanding of shallow
activity beneath volcanoes.

DOI： 10.1029/2018GL080202

その他リンク： https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GL080202

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1186/s40623-016-0590-2

その他リンク： https://earth-planets-space.springeropen.com/articles/10.1186/s40623-016-0590-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1093/gji/ggw459

その他リンク： https://academic.oup.com/gji/article/208/3/1359/2666335/Three-dimensional-resistivity-structure-of-Asama

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

その他リンク： https://www.jstage.jst.go.jp/article/kazan/61/2/61_345/_pdf

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.epsl.2016.03.024

その他リンク： http://www.sciencedirect.com/science/article/pii/S0012821X1630111X

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/2015GL067445

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/2015GL067445/abstract;jsessionid=3FBD45B54BFAEA7899CCC871C47CFFBE.f02t03

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1130/G37313.1

その他リンク： http://geology.geoscienceworld.org/cgi/content/full/44/2/127?ijkey=LX6PXeyXqeM7o&keytype=ref&siteid=gsgeology

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/2013JB010682

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/2013JB010682/abstract

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.5047/eps.2013.05.008

その他リンク： http://link.springer.com/article/10.5047%2Feps.2013.05.008#page-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Continuous magnetotelluric (MT) measurements were conducted from May 2008 to July 2009 at Sakurajima,
one of the most active volcanoes in Japan. Two observation sites were established at locations 3.3 km east and
3 km west–northwest of the summit crater. At both observation sites, the high-quality component of the
impedance tensor (Zyx) showed variations in apparent resistivity of approximately ±20% and phase change
of ±2°, which continued for 20–180 days in the frequency range between 320 and 4 Hz. The start of the
period of changes in apparent resistivity approximately coincided with the start of uplift in the direction of the
summit crater, as observed by a tiltmeter, which is one of the most reliable pieces of equipment with which to
detect magma intrusion beneath a volcano. A 2D inversion of MT impedance suggests that the resistivity
change occurred at a depth around sea level. One of the possible implications of the present finding is that the
degassed volatiles migrated not only vertically through the conduit but also laterally through a fracture
network, mixing with shallow groundwater beneath sea level and thereby causing the observed resistivity
change.

DOI： 10.1016/j.jvolgeores.2010.11.003

その他リンク： http://www.sciencedirect.com/science/article/pii/S0377027310003446

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2010GL044208

その他リンク： http://onlinelibrary.wiley.com/doi/10.1029/2010GL044208/abstract

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2009GL040016

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jvolgeores.2009.08.009

その他リンク： http://www.sciencedirect.com/science/article/pii/S037702730900328X

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： 10.1029/2008JB005910

その他リンク： http://onlinelibrary.wiley.com/doi/10.1029/2008JB005910/abstract;jsessionid=F49358E54DB652E1F1865C194AF3F2B9.f02t02

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jvolgeores.2008.03.011

その他リンク： http://www.sciencedirect.com/science/article/pii/S0377027308001042

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jvolgeores.2008.01.016

その他リンク： http://www.sciencedirect.com/science/article/pii/S0377027308000462

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2007JB005058

その他リンク： http://onlinelibrary.wiley.com/doi/10.1029/2007JB005058/abstract

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.epsl.2005.03.023

その他リンク： http://www.sciencedirect.com/science/article/pii/S0012821X05002694

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2004GL019477

その他リンク： http://onlinelibrary.wiley.com/doi/10.1029/2004GL019477/abstract

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2004GL019462

その他リンク： http://onlinelibrary.wiley.com/doi/10.1029/2004GL019462/abstract

出版者・発行元：Earth Planets and Space  

(Figure presented.)

DOI： 10.1186/s40623-025-02209-6

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Geophysical Research Solid Earth  

Intraplate earthquakes occur more frequently in the Japanese islands than in other regions. Large intraplate earthquakes in the island arc preferentially occur in strain concentration zones detected by geological and geodetic studies. Crustal heterogeneity plays a crucial role in generating large intraplate earthquakes and strain concentrations. Thus, we elucidated the crustal heterogeneities beneath a strain concentration area on the back-arc side of the northeastern Japan Arc based on electrical resistivity, which is sensitive to weak zones in the crust. By deploying wideband magnetotelluric surveys, we revealed the three-dimensional electrical resistivity structure in the crust, suggesting the coexistence of two different types of strain-concentration mechanisms in the strain-concentration area. The shallow conductive layers and lower-crustal conductors appear to act as low-elastic-modulus and low-viscosity areas, respectively, and are responsible for the strain concentration. We found shallow and lower-crustal conductors in the strain concentration zone revealed by geological studies. Those conductive areas are considered to act as mechanically weak zones and cause stress loading on the brittle pars of pre-existing faults, resulting in large intraplate earthquakes. The resultant earthquakes presumably contribute to strain accumulation on a geological timescale. In addition, a spatial correlation between the epicenters of large intraplate earthquakes and edges of lower-crustal conductors implies the contribution of the fluids in the lower crust to the generation of large earthquakes. We also identified vertical conductors ranging from the lower crust to Quaternary volcanoes, which may indicate trans-crustal magmatic systems under these volcanoes.

DOI： 10.1029/2023JB028522

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記述言語：日本語   出版者・発行元：Conductivity Anomaly 研究グループ  

DOI： 10.60410/pcaw.2024.0_10

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記述言語：日本語   出版者・発行元：Conductivity Anomaly 研究グループ  

DOI： 10.60410/pcaw.2024.0_52

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記述言語：日本語   出版者・発行元：Conductivity Anomaly 研究グループ  

DOI： 10.60410/pcaw.2024.0_67

CiNii Research

記述言語：日本語   出版者・発行元：特定非営利活動法人 日本火山学会  

DOI： 10.18940/vsj.2024.0_195

CiNii Research

記述言語：日本語   出版者・発行元：特定非営利活動法人 日本火山学会  

DOI： 10.18940/vsj.2024.0_189

CiNii Research

記述言語：日本語   出版者・発行元：特定非営利活動法人 日本火山学会  

DOI： 10.18940/vsj.2024.0_98

CiNii Research

記述言語：日本語   出版者・発行元：特定非営利活動法人 日本火山学会  

DOI： 10.18940/vsj.2024.0_168

CiNii Research

記述言語：日本語   出版者・発行元：特定非営利活動法人 日本火山学会  

DOI： 10.18940/vsj.2023.0_128

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記述言語：日本語   出版者・発行元：特定非営利活動法人 日本火山学会  

DOI： 10.18940/vsj.2023.0_210

CiNii Research

記述言語：日本語   出版者・発行元：特定非営利活動法人 日本火山学会  

DOI： 10.18940/vsj.2022.0_79

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記述言語：日本語   出版者・発行元：一般社団法人日本地球化学会  

<p>同位体比分析から推定されるマグマ起源流体、地下電気比抵抗構造、地震活動の3者の数kmから数10 kmスケールの空間的な対応関係を整理することで得られつつある知見をまとめる(１)マグマ起源流体の寄与が大きい場所では低比抵抗体が深部まで伸びている。つまり低比抵抗体が深部からの流体の上昇経路として機能している。(２)深さ数10 kmの深部低周波地震は低比抵抗体の端部で発生する。(３)マグニチュード６以上の内陸地震は低比抵抗体の周辺から開始する。未解決問題としては以下のことを挙げたい。(１)低比抵抗体のどの部分が流体の上昇経路か (全体か、中心部か、端部か)。(２)マグマ、水、ガス (CO2) の上昇経路、上昇速度は同じか異なるか。(３)大地震に寄与する流体の実体はマグマか水かガス (CO2) か。(４)ヘリウム同位体比から推定されるマグマの起源 (マントルプルーム型 or島弧型) と比抵抗構造の関係。</p>

DOI： 10.14862/geochemproc.69.0_112

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熊本地震と地下比抵抗構造の関係を地球電磁気・地球惑星圏学会で発表した紹介。

導電性の差、地震生む？
地盤 危険性予測に活用
九大 熊本地震受け分析

鹿児島、宮崎県境のえびの高原で、地表に湧き出ている湯の温度が上昇していることが分かった。