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List of Papers
Yasuhiro Fujimitsu Last modified date：2024.04.23

Professor / Earth Science and Technology / Department of Earth Resources Engineering / Faculty of Engineering


Papers
1. Marietta Wanjira MUTONGA, Yasuhiro FUJIMITSU, Evaluation of In-situ Stress Orientations within the Central Kenyan Rift, through Analysis of Borehole Images of Wells Drilled in Menengai Geothermal Field, Kenya, Geothermics, 10.1016/j.geothermics.2023.102908, 118, 22p, 2023.12.
2. Naoto YOSHIDA, Mitsuo MATSUMOTO, Yasuhiro FUJIMITSU, Numerical Simulation of Instability in Geothermal Production Well, Proceedings of International Symposium on Earth Science and Technology 2023, 561-564, 2023.11.
3. Amani BERRA, Yasuhiro FUJIMITSU, Status of Geothermal Development in Tanzania, Proceedings of International Symposium on Earth Science and Technology 2023, 434-434, 2023.11.
4. Pitoyo Anggit LISTYANTO, Yasuhiro FUJIMITSU, Geothermal Power Plant Development in PLN, Indonesia, Proceedings of International Symposium on Earth Science and Technology 2023, 274-274, 2023.11.
5. Habtamu ABATNEH, Yasuhiro FUJIMITSU, Geothermal Country Report of Ethiopia, Proceedings of International Symposium on Earth Science and Technology 2023, 270-270, 2023.11.
6. Fathia ABDI, Yasuhiro FUJIMITSU, Djibouti Country Update, Proceedings of International Symposium on Earth Science and Technology 2023, 139-139, 2023.11.
7. Caroline LEPATU, Yasuhiro FUJIMITSU, Country Report of Papua New Guinea, Proceedings of International Symposium on Earth Science and Technology 2023, 108-108, 2023.11.
8. Japhet TOWETT, Edwin KIRAREI, Yasuhiro FUJIMITSU, Country Report for Kenya (2), Proceedings of International Symposium on Earth Science and Technology 2023, 107-107, 2023.11.
9. Lameck MAKORI, Yasuhiro FUJIMITSU, Country Report for Kenya (1), Proceedings of International Symposium on Earth Science and Technology 2023, 106-106, 2023.11.
10. Jessica Arias HERNÁNDEZ, Yasuhiro FUJIMITSU, Costar Rica Country Update, Proceedings of International Symposium on Earth Science and Technology 2023, 105-105, 2023.11.
11. Marietta W. MUTONGA, Yasuhiro FUJIMITSU, 3D Natural State Model of Menengai East Geothermal Reservoir, Kenya, Geothermal Resources Council Transactions, 47, 3079-3092, 2023.10.
12. Marietta MUTONGA, Thomas TINDELL, Kotaro YONEZU, Yasuhiro FUJIMITSU, Characteristics of Fluid Inclusions in Menengai Geothermal Field, Kenya from Wells MW-35, MW-28A & MW-10B, Proceedings World Geothermal Congress 2023, 8p, 2023.09.
13. Gilbert BETT, Tatsuya WAKEYAMA, Yasuhiro FUJIMITSU, Application of Landsat 8 Images to Map Surface Heat Loss on Olkaria East and Southeast Geothermal Field, Naivasha, Kenya, 日本地熱学会誌, 10.11367/grsj.45.165, 45, 3, 165-173, 2023.07.
14. Mitsuo MATSUMOTO, Haruki OKADA, Ryuichi ITOI, Yasuhiro FUJIMITSU, Numerical Simulation of Periodic Wellbore Flow Due to the Inflow of Low-Enthalpy Fluid, Proceedings of Stanford Geothermal Workshop 2023 (48th Workshop on Geothermal Reservoir Engineering), 6p, 2023.02.
15. Tarek ARAFA-HAMED, Mohamed Abdel ZAHER, Gad EL-QADY, Hossam MARZOUK, Samah ELBARBARY, Yasuhiro FUJIMITSU, Deep Heat Source Detection Using the Magnetotelluric Method and Geothermal Assessment of the Farafra Oasis, Western Desert, Egypt, Geothermics, 10.1016/j.geothermics.2023.102648, 109, 13p, 2023.01.
16. Gilbert BETT, Yasuhiro FUJIMITSU, Integrated Geological Assessment and Numerical Simulation for Olkaria’s East and Southeast Geothermal Fields, Geothermics, 10.1016/j.geothermics.2023.102652, 109, 13p, 2023.01.
17. Keigo KITAMURA, Yuki FUJII, Haruhiro INAGAKI, Koki AIZAWA., Jun-ichiro ISHIBASHI, Hiroki SAITO, Yasuhiro FUJIMITSU, Evaluation of a Potential Supercritical Geothermal System in the Kuju Region, Central Kyushu, Japan, Geothermics, 10.1016/j.geothermics.2022.102602, 107, 12p, 2023.01.
18. Shunsuke ZAIMA, Jun NISHIJIMA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Deep Hydrothermal System Inferred from the MT and Gravity Survey in the Hohi Geothermal Area, Central Kyushu, Japan, Proceedings of International Symposium on Earth Science and Technology 2022, 425-428, 2022.12.
19. Gilbert BETT, Yasuhiro FUJIMITSU, Analytical Description of the Production Decline at the Olkaria East Geothermal Field, Naivasha Kenya, Proceedings of International Symposium on Earth Science and Technology 2022, 174-181, 2022.12.
20. Marietta MUTONGA, Yasuhiro FUJIMITSU, Geochemistry of Discharged Fluids from Production Well MW-20B Menengai Geothermal Field, Kenya, Proceedings of International Symposium on Earth Science and Technology 2022, 162-167, 2022.12.
21. Philip OMOLLO, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Kazuki SAWAYAMA, Resistivity Structural Imaging of the Olkaria Domes Geothermal Field in Kenya Using 2D and 3D MT Data Inversion, Geothermics, 10.1016/j.geothermics.2022.102414, 103, 17p, 2022.07.
22. Jun-ichiro. ISHIBASHI, Kei YAMASHITA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Syogo OSHIMA, Yumi. KIYOTA, Gas Geochemistry of Geothermal Fluids from the Hatchobaru Geothermal Field, Japan, Geothermics, 10.1016/j.geothermics.2022.102379, 102, 7p, 2022.03.
23. Mohamed BELHAI, Yasuhiro FUJIMITSU, Rosa Maria BARRAGAN-REYES, Tatsuto IWANAGA, Mamiko MAENO, Brahim AYAD, Fatima Zohra BOUCHAREB-HAOUCHINE, Jun NISHIJIMA, Djelloul BELHAI, Abdelhamid HAOUCHINE, Insights into Geochemical Characteristics of the Geothermal Fluids of Northwestern Algeria: An Updated Conceptual Model, Geothermics, 10.1016/j.geothermics.2021.102304, 99, 21p, 2021.12.
24. Marietta MUTONGA, Yasuhiro FUJIMITSU, An Insight of the Subsurface through Borehole Images Case Study of MW-34 Menengai Geothermal Field, Kenya, Proceedings 43rd New Zealand Geothermal Workshop, 7p, 2021.11.
25. Kevin GUTIERREZ, Yasuhiro FUJIMITSU, Mitsuo MATSUMOTO, Assessment of the Current Reservoir Conditions of Momotombo Geothermal Field, Nicaragua, Proceedings of International Symposium on Earth Science and Technology 2021, 149-152, 2021.11.
26. Haissama Osman ALI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Magnetotelluric MT Survey in Nord-Ghoubbet Geothermal Field (Djibouti), Proceedings of International Symposium on Earth Science and Technology 2021, 143-148, 2021.11.
27. Philip OMOLLO, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Unraveling the Subsurface Architectural Design of the Olkaria Geothermal Reservoir Using 2D and 3D MT Data Inversion, Proceedings of International Symposium on Earth Science and Technology 2021, 136-142, 2021.11.
28. Gilbert BETT, Yasuhiro FUJIMITSU, Assessing the Geophysical Enablers for the Olkaria’s East and Southeast Fields Huge Expansion, Proceedings of International Symposium on Earth Science and Technology 2021, 127-135, 2021.11.
29. Koki AIZAWA, Mitsuru UTSUGI, Keigo KITAMURA, Takao KOYAMA, Makoto UYESHIMA, Nobuo MATSUSHIMA, Shinichi TAKAKURA, Haruhisa INAGAKI, Hiroki SAITO, Yasuhiro FUJIMITSU, Magmatic Fluid Pathways in the Upper Crust: Insights from Dense Magnetotelluric Observations around the Kuju Volcanoes, Japan, Geophysical Journal International, 10.1093/gji/ggab368, 228, 2, 755-772, 2021.09.
30. Yohei MORIFUJI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Md. Bodruddoza MIA, Shuto ONIZUKA, Analysis of Heat Discharge Rate in Geothermal Areas Using Remote Sensing Techniques: Case Study of Unzen Geothermal Area, Japan; Papandayan and Tangkuban Perahu Geothermal Area, Indonesia, Pure and Applied Geophysics, 10.1007/s00024-021-02743-w, 178, 2241-2256, 2021.05.
31. Kazuki SAWAYAMA, Fei JIANG, Tatsunori IKEDA, Takuya ISHIBASHI, Takeshi TSUJI, Yasuhiro FUJIMITSU, Hiroshi ASANUMA, Estimation of Permeability and Water Saturation from the Resistivity and Elastic Wave Velocity: Insight from Laboratory Experiment and Digital Fracture Simulation, Proceedings World Geothermal Congress 2020+1, 10p, 2021.04.
32. Carlos POCASANGRE, Yasuhiro FUJIMITSU, Fidel CORTEZ, Rubén HENRIQUEZ, A Python-based Stochastic Library for Assessing Geothermal Power Potential in the Municipality of Nombre de Jesús, El Salvador, Proceedings World Geothermal Congress 2020+1, 12p, 2021.04.
33. Jun NISHIJIMA, Ryo TODA, Yasuhiro FUJIMITSU, Underground Structure Delineated from Gravity and AGG Data Analysis in the Hohi Geothermal Area, Central Kyushu, Japan, Proceedings World Geothermal Congress 2020+1, 6p, 2021.04.
34. Justus MAITHYA, Yasuhiro FUJIMITSU, Geophysical Characterization of the Eburru Geothermal Field, Kenya from the Analysis and Interpretation of Magnetotelluric and Gravity Techniques, Proceedings World Geothermal Congress 2020+1, 11p, 2021.04.
35. Isaack KANDA, Yasuhiro FUJIMITSU, Geophysical and Geochemical Characterization of Menengai Geothermal System, Kenya, Proceedings World Geothermal Congress 2020+1, 15p, 2021.04.
36. Yasuhiro FUJIMITSU, Jun NISHIJIMA, Sachio EHARA, Tohru MOGI, Transition of Numerical Models for the Hydrothermal System of the Kuju Volcano, Japan, Proceedings World Geothermal Congress 2020+1, 9p, 2021.04.
37. Mohamed BELHAI, Yasuhiro FUJIMITSU, Rosa Maria BARRAGAN-REYES, Tatsuto IWANAGA, Mamiko MAENO, Brahim AYAD, Fatima Zohra BOUCHAREB-HAOUCHINE, Jun NISHIJIMA, Djelloul BELHAI, Abdelhamid HAOUCHINE, Geochemical Characteristics of Thermal Fluids from Northwest Algeria, Proceedings World Geothermal Congress 2020+1, 11p, 2021.04.
38. Hiroshi ASANUMA, Toru MOGI, Noriyoshi TSUCHIYA, Noriaki WATANABE, Shigemi NAGANAWA, Yasuo OGAWA, Yasuhiro FUJIMITSU, Tatsuya KAJIWARA, Kazumi OSATO, Kuniaki SHIMADA, Seiki HORIMOTO, Takashi SATO, Shigeto YAMADA, Kimio WATANABE, Japanese Supercritical Geothermal Project for Drastic Increase of Geothermal Power Generation in 2050, Proceedings World Geothermal Congress 2020+1, 5p, 2021.04.
39. Samatar ABDI, Tatsuya WAKEYAMA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Hydrothermal Alteration Mapping Using ASTER Image of Arta, Geothermal Area of Djibouti, Proceedings World Geothermal Congress 2020+1, 9p, 2021.04.
40. Kazuki SAWAYAMA, Takuya ISHIBASHI, Fei JIANG, Takeshi TSUJI, Osamu NISHIZAWA, Yasuhiro FUJIMITSU, Scale-independent relationship between permeability and resistivity in mated fractures with natural rough surfaces, Geothermics, 10.1016/j.geothermics.2020.102065, 94, 18p, 2021.04.
41. Bekele Dejene MULUGETA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Hakim SAIBI, Interpretation of gravity data to delineate the subsurface structures and reservoir geometry of the Aluto–Langano geothermal field, Ethiopia, Geothermics, 10.1016/j.geothermics.2020.102093, 94, 17p, 2021.03.
42. Mitsuo MATSUMOTO, Haruki OKADA, Ryuichi ITOI, Yasuhiro FUJIMITSU, Preliminary study of dependence of the modification factor controlling generation of periodic wellbore flow, Proceedings of the 46th Stanford Geothermal Workshop, 4p, 2021.02.
43. Kazuki SAWAYAMA, Takuya ISHIBASHI, Fei JIANG, Takeshi TSUJI, Yasuhiro FUJIMITSU, Relating Hydraulic-Electrical-Elastic Properties of Natural Rock Fractures at Elevated Stress and Associated Transient Changes of Fracture Flow, Rock Mechanics and Rock Engineering, 10.1007/s00603-021-02391-5, 54, 2145-2164, 2021.02.
44. Mitsuo MATSUMOTO, Ryuichi ITOI, Yasuhiro FUJIMITSU, Theoretical study of conditions for generation of periodic wellbore flow due to inflow of a lower-enthalpy fluid, Geothermics, 10.1016/j.geothermics.2020.101948, 89, 11p, 2021.01.
45. Samatar Abdi MOHAMED, Tatsuya WAKEYAMA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Hydrothermal Alteration Mapping using ASTER Image of Arta, Geothermal Area of Djibouti, Proceedings of International Symposium on Earth Science and Technology 2020, 264-269, 2020.11.
46. Kazuki SAWAYAMA, Fei JIANG, Takeshi TSUJI, Yasuhiro FUJIMITSU, Development of two-phase fracture flow simulation method using Shan-Chen type lattice Boltzmann model, Proceedings of International Symposium on Earth Science and Technology 2020, 250-253, 2020.11.
47. Hirofumi TAKAI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Tatsuya WAKEYAMA, Mitsuo MATSUMOTO, Study on the subsurface structure and the hydrothermal system at Harazuru hot spring, Fukuoka Prefecture, Proceedings of International Symposium on Earth Science and Technology 2020, 247-249, 2020.11.
48. Justus MAITHYA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Analysis of Gravity Data to Delineate Structural Features Controlling the Eburru Geothermal System in Kenya, Geothermics, 10.1016/j.geothermics.2019.101795, 85, 14p, 2020.05.
49. Marnel Arnold RATIOA, Jillian Aira GABO-RATIO, Yasuhiro FUJIMITSU, Exploring Public Engagement and Social Acceptability of Geothermal Energy in the Philippines: A Case Study on the Makiling-Banahaw Geothermal Complex, Geothermics, 10.1016/j.geothermics.2019.101774, 85, 13p, 2020.05.
50. Mitsuo MATSUMOTO, Ryuichi ITOI, Yasuhiro FUJIMITSU, Numerical Study on Conditions for Generation of Periodic Wellbore Flows, Proceedings of the 45th Stanford Geothermal Workshop, 2020.02.
51. Carlos POCASANGRE, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Interpretation of Gravity Data to Delineate the Geothermal Reservoir Extent and Assess the Geothermal Resource from Low-temperature Fluids in the Municipality of Isa, Southern Kyushu, Japan, Geothermics, 10.1016/j.geothermics.2019.101735, 83, 29p, 2020.01.
52. Kazuki SAWAYAMA, Takuya ISHIBASHI, Fei JIANG, Takeshi TSUJI, Yasuhiro FUJIMITSU, Changes in Hydraulic, Electric and Mechanical Properties with Aperture Closure: Insight from Experimental and Numerical Approaches, Proceedings of the YSRM2019 & REIF2019, Paper number 3-2-2, 2019.12.
53. Hiroki SHIMADA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Geothermal Structure in the Western Part of Kirishima Volcano, Proceedings of International Symposium on Earth Science and Technology 2019, 516-519, 2019.12.
54. Kentaro SHIMODA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Monitoring Geothermal Reservoir by Measuring Gravity Change in Ogiri Geothermal Area, Proceedings of International Symposium on Earth Science and Technology 2019, 512-515, 2019.12.
55. Ryosuke TSUTSUI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Subsurface Structure Analysis in Beppu Area by Gravity Survey to Clarify of Hot Spring Eruption Mechanism, Proceedings of International Symposium on Earth Science and Technology 2019, 508-511, 2019.12.
56. Tetsuya YAMAMOTO, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Research on Improving Accuracy of Heat Discharge Estimation System by Observing Fumarolic Gas, Proceedings of International Symposium on Earth Science and Technology 2019, 504-507, 2019.12.
57. Ryo TODA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Study on Elucidation of Hydrothermal System around Shishimuta Caldera, Proceedings of International Symposium on Earth Science and Technology 2019, 501-503, 2019.12.
58. Soshi KAMITAKI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Tatsuya WAKEYAMA, A Study on Detection of Anomalous Groundwater Level Using Machine Learning, Proceedings of International Symposium on Earth Science and Technology 2019, 462-465, 2019.12.
59. Justus MAITHYA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Three-Dimensional Gravity Modeling for Imaging the Geothermal Reservoir Border in Eburru
Geothermal Field, Kenya
, Proceedings of International Symposium on Earth Science and Technology 2019, 13-18, 2019.12.
60. Kyosuke OKAMOTO, Hiroshi ASANUMA, Takuya ISHIBASHI, Yusuke YAMAYA, Hanae SAISHU, Norio YANAGISAWA, Toru MOGI, Noriyoshi TSUCHIYA, Atsushi OKAMOTO, Shigemi NAGANAWA, Yasuo OGAWA, Kazuya ISHITSUKA, Yasuhiro FUJIMITSU, Keigo KITAMURA, Tatsuya KAJIWARA, Seiki HORIMOTO, Kuniaki SHIMADA, Geological and Engineering Features of Developing Ultra-high-temperature Geothermal Systems in the World, Geothermics, 10.1016/j.geothermics.2019.07.002, 82, 267-281, 2019.11.
61. Kazuki SAWAYAMA, Takeshi TSUJI, Yasuhiro FUJIMITSU, Coupling Approach of Lattice Boltzmann Fluid Simulation and Finite Element Analysis of Geophysical Properties: Application to Natural Rock Fracture in Geothermal Area, Proceedings of International Exchange and Innovation Conference on Engineering & Sciences, doi/10.15017/2552941, 5, 73-76, 2019.10.
62. Justus Mutuku MAITHYA, Yasuhiro FUJIMITSU, Analysis and interpretation of magnetotelluric data in characterization of geothermal resource in Eburru geothermal field, Kenya, Geothermics, 10.1016/j.geothermics.2019.04.003, 81, 12-31, 2019.09.
63. Kazuki SAWAYAMA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Effects of Water Saturation, Fracture and Salinity on Electric and Elastic Properties of Fractured Geothermal Rocks, 日本地熱学会誌, 10.11367/grsj.41.53, 41, 2, 53-59, 2019.04.
64. Isaack Kiprono KANDA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Geological Structures Controlling the Placement and Geometry of Heat Sources within the Menengai Geothermal Field, Kenya as Evidenced by Gravity Study, Geothermics, 10.1016/j.geothermics.2018.12.012, 79, 67-81, 2019.01.
65. Md. Bodruddoza MIA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Exploration of Hydrothermal Alteration and Monitoring of Thermal Activity Using Multi-source Satellite Images: A Case Study of the Recently Active Kirishima Volcano Complex on Kyushu Island, Japan, Geothermics, 10.1016/j.geothermics.2019.01.006, 79, 26-45, 2019.01.
66. Yoshiyuki MIZUSAWA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Gravity Changes as a Matching Parameter of 3D Numerical Simulation in Kuju Iwoyama, Proceedings of International Symposium on Earth Science and Technology 2018, 579-582, 2018.11.
67. Makoto ENOKIMARU, James CANNON, Kazuki SAWAYAMA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Dependence of Electrical Conductivity of Geothermal Fluid on Temperature, Pressure and NaCl Concentration Using Molecular Dynamics, Proceedings of International Symposium on Earth Science and Technology 2018, 494-497, 2018.11.
68. Kazuki SAWAYAMA, Tatsunori IKEDA, Takeshi TSUJI, Yasuhiro FUJIMITSU, Numerical Experiments of Elastic Wave Propagation through Digitalized Fractures under Various Aperture and Saturation Conditions, Proceedings of International Symposium on Earth Science and Technology 2018, 127-130, 2018.11.
69. Carlos POCASANGRE, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Three-dimensional Gravity modeling for Defining the Underground Volume of the Hydrothermal Alteration Zone in the Eastern Part of Isa City, Kagoshima Prefecture, Proceedings of International Symposium on Earth Science and Technology 2018, 42-47, 2018.11.
70. Justus MAITHYA, Yasuhiro FUJIMITSU, Three-dimensional Magnetotelluric Characterization of the Eburu Geothermal Field, Kenya, Proceedings of International Symposium on Earth Science and Technology 2018, 27-32, 2018.11.
71. Isaack KANDA, Yasuhiro FUJIMITSU, Geological Structures Controlling the Placement and Geometry of Heat Sources within Menengai Geothermal Field, Kenya as Evidenced by Gravity Study, Proceedings of 13th Society of Exploration Geophysicists of Japan (SEGJ) International Symposium, 10.1190/SEGJ2018-058.1, 2018.11.
72. Justus MAITHYA, Yasuhiro FUJIMITSU, Analysis and Interpretation of Gravity Data to Delineate Structural Features in Eburru Geothermal Field, Kenya, Proceedings of 13th Society of Exploration Geophysicists of Japan (SEGJ) International Symposium, 10.1190/SEGJ2018-058.1, 2018.11.
73. Carlos POCASANGRE, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Utilization of Gravity Data for Figuring Out both the Hydrothermal Alteration Zone and the Underground Structure so that Possible Geothermal Exploitation in the Municipality of Isa, Japan, Proceedings of 13th Society of Exploration Geophysicists of Japan (SEGJ) International Symposium, 10.1190/SEGJ2018-057.1, 2018.11.
74. Kazuki SAWAYAMA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Laboratory Measurements on Electric and Elastic Properties of Fractured Geothermal Reservoir Rocks under Simulated EGS Conditions, Geothermal Resources Council Transactions, 42, 2459-2475, 2018.10.
75. Hiroshi Asanuma, Toru Mogi, Noriyoshi Tsuchiya, Noriaki Watanabe, Shigemi Naganawa, Yasuo Ogawa, Yasuhiro Fujimitsu, Tatsuya Kajiwara, Kazumi Osato, Kuniaki Shimada, Seiki Horimoto, Takashi Sato, Tetsuya Ito, Shigeto Yamada, Kimio Watanabe, Yoshiharu Gotoh, Yutaka Nagasawa, Akira Kohyama, Status report on the Japanese Supercritical Geothermal Project for FY2017, Geothermal Resources Council 2018 Annual Meeting: Geothermal's Role in Today's Energy Market, GRC 2018 Geothermal's Role in Today's Energy Market - Geothermal Resources Council 2018 Annual Meeting, GRC 2018, 2366-2370, 2018.10, Japanese scientists have estimated that nationwide potential of “Supercritical Geothermal Resources in Japan”, originating by the subduction of oceanic plates, reaches hundreds GWs. Power generation from the supercritical geothermal resources in Japan can contribute significantly to both energy security and reduction of emissions of CO 2 . The temperature range of the target supercritical rock body is about 400-500 o C and its depth is expected to be less than several kilometers. The depths of the supercritical rock bodies in Japan are much shallower those in other areas in the world, which brings advantages in terms of accessibility, economy, and safety. However, there are a lot of scientific unknowns about their nature, especially regarding rock-mechanical and geochemical behavior under supercritical conditions. Technological breakthroughs will be necessary, because the temperature and pressure conditions in the supercritical geothermal systems are far beyond the current technological limitations and also because experiences in previous ultra-high temperature geothermal drilling suggest that the presence of acidic geothermal fluid is likely. The Japanese government has recognized that supercritical geothermal power generation is one of the key technologies in its strategy to drastically reduce CO 2 emissions in and after 2050 (NESTI2050). In FY2017, funded by NEDO (New Energy and Industrial Technology Development Organization), a team of Japanese researchers from 14 organizations have started a national project to improve understanding of the nature of supercritical rock bodies and the engineering necessary to extract geothermal energy. This project is a feasibility study combining science, engineering, economics, and environmental issues..
76. Relationship between Complex Resistivity, Elastic Wave and Water Saturation of Cracked Andesite under Laboratory Fluid-Flow Test
Kazuki SAWAYAMA, Keigo KITAMURA and Yasuhiro FUJIMITSU
BUTSURI-TANSA (Exploration geophysics), Vol.71, pp.71–85, October, 2018.
77. Md. Bodruddoza MIA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Monitoring of Thermal Activity at the Hatchobaru-Otake Geothermal Area in Japan Using Multi-source Satellite Images - With Comparisons of Methods, and Solar and Seasonal Effects, Remote Sensing, 10.3390/rs10091430, 10, 9, 40p, 2018.09.
78. Md. Bodruddoza MIA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Monitoring Thermal Activity of the Beppu Geothermal Area in Japan Using Multisource Satellite Thermal Infrared Data, Geosciences, 10.3390/geosciences8080306, 8, 8, 26p, 2018.08.
79. Carlos POCASANGRE, Yasuhiro FUJIMITSU, A Python-based Stochastic Library for Assessing Geothermal Power Potential Using the Volumetric Method in a Liquid-dominated Reservoir, Geothermics, 10.1016/j.geothermics.2018.07.009, 76, 164-176, 2018.07.
80. Jun NISHIJIMA, Daisuke YANAI, Yasuhiro FUJIMITSU, A Density Structure Inferred from Airborne Gravity Gradiometry Data in Kuju Geothermal Field, Central Kyushu, Japan, Proceedings of Grand Renewable Energy 2018, P-Ge-5, 4p, 2018.06.
81. Md. Bodruddoza MIA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Exploration and Monitoring of Hatchobaru-Otake Geothermal Field Using Aster Satellite Images, Proceedings of Grand Renewable Energy 2018, P-Ge-4, 4p, 2018.06.
82. Justus MAITHYA, Yasuhiro FUJIMITSU, Application of 2-D Magnetotelluric Data in Investigation of Geothermal Anomaly in Eburru Geothermal Field, Kenya, Proceedings of Grand Renewable Energy 2018, O-Ge-4-3, 4p, 2018.06.
83. Kazuki SAWAYAMA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Effects of Water Saturation, Fracture and Salinity on Electric and Elastic Properties of Fractured Geothermal Rocks, Proceedings of Grand Renewable Energy 2018, O-Ge-4-1, 4p, 2018.06.
84. Carlos POCASANGRE, Yasuhiro FUJIMITSU, Analysis of Gravity Data for Figuring Out Geothermal Reservoir Border and Assessment of Geothermal Potential in the Municipality of Isa, Kagoshima Prefecture, Proceedings of Grand Renewable Energy 2018, O-Ge-3-1, 4p, 2018.06.
85. Yasuhiro FUJIMITSU, Jun NISHIJIMA, Numerical Model of Futsukaichi Hot Springs, a Low-enthalpy Geothermal System in Japan, Proceedings of Grand Renewable Energy 2018, O-Ge-1-3, 4p, 2018.06.
86. Isaack Kiprono KANDA, Yasuhiro FUJIMITSU, Geochemical Modeling of Silica Oversaturated Peralkaline Volcanic Complex in Menengai Geothermal System, Kenya, Proceedings of Grand Renewable Energy 2018, O-Ge-1-1, 4p, 2018.06.
87. Kensho OTA, Jun NISHIJIMA, Shinji OHSAWA, Yasuhiro FUJIMITSU, Toru MOGI, Numerical Modeling to Evaluate the Sustainability of the Hot Spring Resources of the Beppu Geothermal Area in Southeastern Japan, Proceedings of International Symposium on Earth Science and Technology 2017, 746-749, 2017.11.
88. Kazuho SAKATA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, A Conceptual Model of Fluid Flow within the Oguni Area Incorporating Gravity and Other Survey Data in GIS Software, Proceedings of International Symposium on Earth Science and Technology 2017, 592-595, 2017.11.
89. Kazuki SAWAYAMA, Takeshi TSUJI, Keigo KITAMURA, Yasuhiro FUJIMITSU, Numerical Simulation and Laboratory Measurement of Hydraulic and Electric Properties of Digitalized Fractures, Proceedings of International Symposium on Earth Science and Technology 2017, 404-407, 2017.11.
90. Carlos POCASANGRE, Yasuhiro FUJIMITSU, Analysis of Preliminary Gravity Data for Figuring Out Geothermal Reservoir Border and Underground Structure in Hishikari Area, Kagoshima Prefecture, Proceedings of International Symposium on Earth Science and Technology 2017, 60-67, 2017.11.
91. Md. Bodruddoza MIA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Thermal Activity Exploration and Monitoring of Recently Active Kirishima Volcano in the Southern Kyushu Island in Japan Using Satellite Imageries, Proceedings of 39th New Zealand Geothermal Workshop, 7p, 2017.11.
92. Md. Bodruddoza MIA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Thermal Activity Monitoring of an Active Volcano Using Landsat 8/OLI-TIRS Sensor Images: A Case Study at the Aso Volcanic Area in Southwest Japan, Geosciences, 10.3390/geosciences7040118, 7, 4, 118-132, 2017.11.
93. Santia Ardi MUSTOFA, Md. Bodruddoza MIA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Using Landsat 8 Remote Sensing Data for Thermal Anomaly Mapping in the Pantar Geothermal Area, East Nusa Tenggara, Indonesia, 九大地熱・火山研究報告, 22, 77-81, 第22号，pp.77-81, 2017.03.
94. Philip OMOLOO, Miguel VILLEGAS, Chika UMEDA, Kento NARITOMI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Precise Microgravity Measurements of the Ogiri Geothermal Field, Japan, 九大地熱・火山研究報告, 22, 53-56, 第22号，pp.53-56, 2017.03.
95. Takashi ZAIZEN, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Subsurface Structure in Oita Hot Spring Area Inferred from Gravity Data, Eastern Kyushu, Japan, Proceedings of 42nd Workshop on Geothermal reservoir Engineering, Stanford University, 2017.02.
96. Monitoring Technique for Sustainable Geothermal Power Generation
Yasuhiro FUJIMITSU
Geotechnical Engineering Magazine, Vol. 65, No. 2, pp.10-11, February, 2017.
97. Mohamed BELHAI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, M. BERSI, Hydrochemical and Gas Geochemistry of the Northeastern Algerian Geothermal Waters, Arabian Journal of Geosciences, 10.1007/s12517-016-2790-2, 10, 1, 15p, 2017.01.
98. Jun NISHIJIMA, Yasuhiro FUJIMITSU, Interpretation of Gravity and Gamma-Ray Spectrometry Data in Low Temperature Hydrothermal Systems, Southeastern Part of Fukuoka, Japan, Acta Geochemica, 10.1515/acgeo-2016-0113, 64, 6, 2289-2304, 2016.12.
99. Santia Ardi MUSTOFA, Md. Bodruddoza MIA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Using Landsat 8 Remote Sensing Data for Thermal Anomaly Mapping in the Pantar Geothermal Area, East Nusa Tenggara, Indonesia, Proceedings of International Symposium on Earth Science and Technology 2016, 624-627, 2016.12.
100. Omollo Philip OMONDI, Miguel Angel Villegas ALVEREZ, Chika UMEDA, Kento NARITOMI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Precise Microgravity Measurements of the Ogiri Geothermal Field, Japan, Proceedings of International Symposium on Earth Science and Technology 2016, 600-603, 2016.12.
101. Kazuki SAWAYAMA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Measurements of Electric Impedance and Elastic Wave Velocity of Cracked Andesite under Laboratory Fluid-Flow Test, Proceedings of International Symposium on Earth Science and Technology 2016, 580-585, 2016.12.
102. Yohei MORIFUJI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Analysis of Heat Loss in Papandayan Geothermal Area Using Landsat 8 Data, Proceedings of International Symposium on Earth Science and Technology 2016, 570-575, 2016.12.
103. Pocasangre CARLOS, Yasuhiro FUJIMITSU, Volumetric Geothermal Resource Assessment in El Salvador by Using Open-Source Programming Language, Proceedings of International Symposium on Earth Science and Technology 2016, 564-569, 2016.12.
104. Isaack Kiprono KANDA, Yasuhiro FUJIMITSU, Reservoir Fluid Recharge to Menengai Geothermal System; Hydrological Constraints, Proceedings of International Symposium on Earth Science and Technology 2016, 557-563, 2016.12.
105. Shuto ONIZUKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Application of Heat Balance Technique to Measure Heat Discharge in Mt. Papandayan Geothermal Field, West Java, Indonesia, Proceedings of International Symposium on Earth Science and Technology 2016, 553-556, 2016.12.
106. Daisuke YANAI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Constructing the 3D Subsurface Density Model of the Kuju Area by Using Gravity Survey Data, Proceedings of International Symposium on Earth Science and Technology 2016, 537-540, 2016.12.
107. Daichi YOSHIOKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Estimation of the Geothermal Resources of a Caldera in Tohoku-region, Proceedings of International Symposium on Earth Science and Technology 2016, 533-536, 2016.12.
108. Yuki YAMAURA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, The Study of Earthquake Prediction Using Groundwater in Fukuoka, Proceedings of International Symposium on Earth Science and Technology 2016, 506-509, 2016.12.
109. Takashi ZAIZEN, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Estimation of Subsurface Structure in Oita Fault System Inferred from Gravity Data, Proceedings of International Symposium on Earth Science and Technology 2016, 502-505, 2016.12.
110. Shoji YAMASHITA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Constructing the Subsurface Model of the Kego Fault Zone from Dense Gravity Data, Proceedings of International Symposium on Earth Science and Technology 2016, 498-501, 2016.12.
111. The Study of Earthquake Prediction Using Groundwater in Fukuoka
Yuki YAMAURA, Yasuhiro FUJIMITSU and Jun NISHIJIMA
Proceedings of Japanese Association of Groundwater Hydrology Conference in the Autumn of 2016, pp.18-19, 2016.
112. The Investigations of Fluid-flows Behavior in Rocks by Electrical Impedance
Keigo KITAMURA, Kazuki SAWAYAMA and Yasuhiro FUJIMITSU
Proceedings of 135th Conference of Society of Engineering Geophysicists Japan, pp.157-158, 2016.
113. Jun NISHIJIMA, Chika UMEDA, Yasuhiro FUJIMITSU, Jun-ichi TAKAYAMA, Naoto HIRAGA, Satoru HIGUCHI, Repeat Absolute and Relative Gravity Measurements for Geothermal Reservoir Monitoring in Ogiri Geothermal Field, Southern Kyushu, Japan, Proceedings of 5th ITB International Geothermal Workshop 2016, 7p, 2016.03.
114. Kazuya ISHITSUKA, T. Tsuji, Toshifumi MATSUOKA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Heterogeneous Surface Displacement Pattern at the Hatchobaru Geothermal Field Inferred from SAR Interferometry Time-series, International Journal of Applied Earth Observation and Geoinformation, 44, 95-103, 2016.02.
115. Mohamed BELHAI, Yasuhiro FUJIMITSU, Fatima Zohra BOUCHAREB-HAOUCHINE, Tatsuto IWANAGA, Masami NOTO, Jun NISHIJIMA, Hydrogeochemical and Isotope Geochemical Study of Northwestern Algerian Thermal Waters, Arabian Journal of Geosciences, 10.1007/s12517-015-2252-2, 9, 17p, 2016.02.
116. Mohamed BELHAI, Yasuhiro FUJIMITSU, Fatima Zohra BOUCHAREB-HAOUCHINE, Abdelhamid HAOUCHINE, Jun NISHIJIMA, A Hydrochemical Study of the Hammam Righa Geothermal Waters in North-Central Algeria, Acta Geochemica, 10.1007/s11631-016-0092-8, 35, 1-17, 2016.01.
117. Yayan SOFYAN, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Shin YOSHIKAWA, Tsuneomi KAGIYAMA, Takahiro OHKURA, The Oscillation Model of Hydrothermal Dynamics beneath Aso Volcano, Southwest Japan after Small Eruption on May 2011: A New Understanding Model using Repeated Absolute and Relative Gravity Measurement, Journal of Volcanology and Geothermal Research, 10.1016/j.jvolgeores.2015.12.012, 310, 172-185, 2015.12.
118. Hiroki NAGAISHI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, The Hydrothermal System Modeling in Northwestern Part of Kirishima Geothermal Area, Special Issue of the Joint Program of Sustainable Resources Engineering, JPSRE, Proceedings of International Symposium on Earth Science and Technology 2015, 42-45, 2015.12.
119. Chika UMEDA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Junichi TAKAYAMA, Naoto HIRAGA, Satoru HIGUCHI, Research on Precise Gravity Measurements for Geothermal Reservoir Monitoring in Ogiri Geothermal Field, Special Issue of the Joint Program of Sustainable Resources Engineering, JPSRE, Proceedings of International Symposium on Earth Science and Technology 2015, 40-41, 2015.12.
120. Kento NARITOMI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, A Monitoring of Hot Spring Aquifer using Repeated Microgravity Measurements in Northern Part of Beppu, Japan, Proceedings of International Symposium on Earth Science and Technology 2015, 384-387, 2015.12.
121. Ryota KAMIMURA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Estimation of Subsurface Structure in Futsukaichi Hot Springs Area by Geophysical Explorations, Proceedings of International Symposium on Earth Science and Technology 2015, 380-383, 2015.12.
122. Shuto ONIZUKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Reparation of Automated Continual Measurement System for Micrometeorological Conditions and Improvement of the Heat Balance Technique for High-accuracy Heat Discharge Measurement, Proceedings of International Symposium on Earth Science and Technology 2015, 376-379, 2015.12.
123. Kento NARITOMI, Jun NISHIJIMA, Shinji OHSAWA, Yasuhiro FUJIMITSU, Monitoring of a Hot Spring Aquifer using Repeated Microgravity Measurements in the Northern Part of Beppu, Japan, Proceedings of 37th New Zealand Geothermal Workshop, 2015.11.
124. Geothermal Reservoir Monitoring by Repeated Precise Gravity Measurement –With Current State of Geothermal Power
Yasuhiro FUJIMITSU and Jun NISHIJIMA
Journal of Cryogenics and Superconductivity Society of Japan, Vol. 50, No. 9, pp.451-457, September, 2015.
125. Md Bodruddoza Mia, Jun Nishijima, Yasuhiro Fujimitsu, Monitoring heat flow before and after eruption of Kuju fumaroles in 1995 using Landsat TIR images, Acta Geodaetica et Geophysica, 10.1007/s40328-014-0075-3, 50, 3, 295-305, 2015.09, The Kuju fumaroles in central Kyushu, Japan began to erupt as phreatic in nature on 11 October 1995. To infer the thermal activity, main objectives were to monitor the radiative heat flux (RHF) before and after eruption of Kuju fumaroles in 1995 using 4 sets of Landsat TM thermal infrared data from 1990 to 1996; and to calculate and monitor the heat discharge rate (HDR) after multiplying RHF using a relationship coefficient between RHF and HDR, derived from two previous studies. The RHF was estimated by using the Stefan–Boltzmann equation for heat flow where we applied satellite image-derived spectral emissivity and land surface temperature. An increasing trend of total radiant heat flux was obtained of about 22–39 MW before the Kuju fumaroles eruption from 1990 to 1994 and a declining trend total RHF of about 37–11 MW after eruption from 1995 to 1996. RHF was strongly correlated with land surface temperature (LST) above ambient in our study. Spatial distribution of RHF also showed a similar trend of total RHF. After using this relationship coefficient, we obtained the HDR from our study area about 144.64, 249.74, 239.67 and 68.54 MW in 1990, 1994, 1995 and 1996, respectively. The HDR was much higher before eruption in October 11, 1995 than that of after the eruption in our study. Fumaroles area also showed an abrupt increase of bared land and no vegetation just after eruption within the thematic map in 1995. Statistics of LST and RHF also showed evidences of heat loss activity before and after eruption in 1995. In conclusion, we infer from this study that Landsat TM thermal infrared images are fully competent to monitor thermal activity from any active volcano fumaroles for future eruption..
126. Evaluation of Soil Specific Thermal Resistance around Underground Power Transmission Lines Using
Kenji KUBOTA, Koichi SUZUKI, Hideshi KAIEDA, Takayoshi YAMAMOTO, Shinji YAMAMOTO and Yasuhiro FUJIMITSU
BUTSURI-TANSA, Vol. 68, No. 2, pp.131-147, April, 2015.
127. Precise Gravity Survey around Minou Fault System, Fukuoka Prefecture, Japan -Relationship between
Jun NISHIJIMA and Yasuhiro FUJIMITSU
Journal of Geothermal Research Society of Japan, Vol. 37, No. 2, pp.41-49, April, 2015.
128. Yasuhiro FUJIMITSU, Yohei ITO, Jun NISHIJIMA, Daisuke OKA, Numerical Modeling of Hydrothermal Systems around Kuju Volcanic Field -An Attempt of Numerical Modeling for a Broad Geothermal System-, Proceeding of World Geothermal Congress 2015, Paper No.16091, 2015.04.
129. Mohamed BELHAI, Yasuhiro FUJIMITSU, Fatima Zohra BOUCHAREB-HAOUCHINE, Jun NISHIJIMA, Geology, Geothermometry, Isotopes and Gas Chemistry of the Northern Algerian Geothermal System, Proceeding of World Geothermal Congress 2015, Paper No.14062, 2015.04.
130. Jun NISHIJIMA, Daisuke OKA, Satoru HIGUCHI, Yasuhiro FUJIMITSU, Jun-ichi TAKAYAMA, Naoto HIRAGA, Repeat Microgravity Measurements Using Absolute and Relative Gravimeter for Geothermal Reservoir Monitoring in Ogiri Geothermal Power Plant, South Kyushu, Japan, Proceeding of World Geothermal Congress 2015, Paper No.13086, 2015.04.
131. Yayan SOFYAN, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Yoichi FUKUDA, Makoto TANIGUCHI, Yunus DAUD, The Hybrid Gravimetry for Optimization Time Lapse Monitoring Data: A Case Study in Kamojang Geothermal Field, Proceeding of World Geothermal Congress 2015, Paper No.13003, 2015.04.
132. Heat Flow Observations in and around Wakamiko Crater in Kagoshima Bay, Kyushu, Japan
Keiko FUJINO, Toshiro YAMANAKA, Sachio EHARA and Yasuhiro FUJIMITSU
Journal of Geothermal Research Society of Japan, Vol. 37, No. 1, pp.13-26, January, 2015.
133. Shintaro OGAWA, Keigo KITAMURA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, The Relationship between the Percentage of Anhydrite in Rock Core and the Velocity of Elastic Waves in the Ogiri Area in Kagoshima Prefecture, Proceedings of International Symposium on Earth Science and Technology 2014, 366-368, 2014.12.
134. Naoaki OGATA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Heat Discharge Changes of Kuju Volcano and Comparison of Some Observed Data with Results of Numerical Modeling, Proceedings of International Symposium on Earth Science and Technology 2014, 293-296, 2014.12.
135. Mohamed BELHAI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Messaouda REZIG, The Northeastern Algeria Geothermal System: An Evidence of Crustal Source of the Geothermal Fluid by Helium Isotope Composition, Proceedings of International Symposium on Earth Science and Technology 2014, 139-148, 2014.12.
136. Kenji KUBOTA, Koichi SUZUKI, Yasuhiro FUJIMITSU, Estimation of Soil Thermal Conductivity by Geophysical Surveys -Relationship between Thermal Conductivity and Electrical Resistivity-, Proceedings of International Symposium on Earth Science and Technology 2014, 47-52, 2014.12.
137. Yuuka KAWABUCHI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, A Reservoir Monitoring and Modelling Using Repeat Microgravity Measurements at Ohaaki Geothermal Field, Proceedings of 36th New Zealand Geothermal Workshop, 2014.11.
138. Marnel Arnold R. RATIO, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Masahiko FUJII, Makoto TANIGUCHI, A Case Study of Impacts, Risks and Vulnerabilities of the Local Community of Makiling-Banahaw Geothermal Complex, Philippines, Proceedings of 36th New Zealand Geothermal Workshop, 2014.11.
139. Alamta SINGARIMBUN, Yasuhiro FUJIMITSU, Mitra DJAMAL, Rezkia Dewi ANDAJANI, Pressure Transient Modeling in Geothermal Reservoir by Using Picard-McLaurin Iteration, Advanced Materials Research, 10.4028/www.scientific.net/AMR.1025-1026.959, 1025-1026, 959-973, 2014.09.
140. Yasuhiro FUJIMITSU, Jun NISHIJIMA, Gravity Surveys in Kurume City, Fukuoka, Japan for Subsurface Structure of Non-volcanic Hydrothermal Systems, Proceedings of Grand Renewable Energy 2014, O-Ge-6-3, 4p, 2014.07.
141. Yohei ITO, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Thermal Modeling around Kuju Volcanic Field, Proceedings of Grand Renewable Energy 2014, P-Ge-4, 4p, 2014.07.
142. Yusaku YONEKURA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Interpretation of the Hydrothermal Systems in Southwestern Part of Kirishima Volcanic Area, Proceedings of Grand Renewable Energy 2014, O-Ge-4-3, 4p, 2014.07.
143. Daisuke OKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Gravity Monitoring and Modeling of the Takigami Geothermal System, Oita Prefecture, Japan, Proceedings of Grand Renewable Energy 2014, O-Ge-4-2, 4p, 2014.07.
144. Marnel Arnold R. RATIO, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Masahiko FUJII, Makoto TANIGUCHI, Perceived Knowledge and Social Acceptance of Geothermal Energy of the Local Community in Makiling-Banahaw Geothermal Complex, Proceedings of Grand Renewable Energy 2014, O-Po-1-5, 4p, 2014.07.
145. Yayan SOFYAN, Yunus DAUD, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Yustin KAMAH, Ahmad YANI, Yoichi FUKUDA, Makoto TANIGUCHI, The First Repeated Absolute Gravity Measurement for Geothermal Monitoring in the Kamojang Geothermal Field, Indonesia, Geothermics, 10.1016/j.geothermics.2014.05.002, 52, 114-142, 2014.05.
146. Interpretation of the Gravity Changes Patterns Observed at the Takigami Geothermal Field, Oita Prefecture, Japan
Daisuke OKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA
Journal of Geothermal Research Society of Japan, Vol. 36, No. 2, pp.75-84, April, 2014.
147. Md. Bodruddoza MIA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Exploration and Monitoring Geothermal Activity Using Landsat ETM + Images: A Case Study at Aso Volcanic Area in Japan, Journal of Volcanology and Geothermal Research, 10.1016/j.jvolgeores.2014.02.008, 275, 14-21, 2014.04.
148. Mohamed BELHAI, Yasuhiro FUJIMITSU, Fatima Zohra BOUCHAREB-HAOUCHINE, Tatsuto IWANAGA, Masami NOTO, Geochemistry of the North Western Algerian Geothermal System, Proceedings of 39th Workshop on Geothermal reservoir Engineering, Stanford University, 2014.02.
149. Yayan SOFYAN, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Shin YOSHIKAWA, Tsuneomi KAGIYAMA, Takahiro OHKURA, Monitoring Geothermal Activity at Aso Volcano, Japan, After Small Eruption in May 2011, Proceedings of 39th Workshop on Geothermal reservoir Engineering, Stanford University, 2014.02.
150. Mohamed BELHAI, Fatima Zohra BOUCHAREB-HAOUCHINE, Yasuhiro FUJIMITSU, Geochemistry of the Hammam Righa Thermal Manifestation North-Central Part of Algeria, Proceedings of International Symposium on Earth Science and Technology 2013, 268-273, 2013.12.
151. Yohei ITO, Yasuhiro FUJIMITSU, Thermal Modeling Focused on Fault Structure of Kuju Volcano, Proceedings of International Symposium on Earth Science and Technology 2013, 246-251, 2013.12.
152. Marnel Arnold Racelis RATIO, Yasuhiro FUJIMITSU, Challenges of Geothermal Energy Development in the Philippines from Social and Political Viewpoints, Proceedings of International Symposium on Earth Science and Technology 2013, 242-245, 2013.12.
153. Yuuka KAWABUCHI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, A Reservoir Monitoring Using Repeat Microgravity Measurements at Ohaaki Geothermal Field, Special Issue of the School on the Move in AJ-BCEP, 73-74, 2013.12.
154. Yusaku YONEKURA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Interpretation of the Hydrothermal System in Southwestern Part of Kirishima Volcano, Special Issue of the School on the Move in AJ-BCEP, 1-2, 2013.12.
155. Current State of Geothermal Energy Utilization in Japan
Yasuhiro FUJIMITSU
Proceedings of Annual Presentation of Institute of Cryogenic Engineering in FY2012, Cryogenics and Superconductivity Society of Japan, pp.35-38, July, 2013.
156. Yasuhiro FUJIMITSU, Precise Repeat Gravity Measurement for Estimation of Mass Balance in a Geothermal Reservoir, Proceedings of 2013 APEC Workshop on Geothermal Energy Development in Taipei, Taiwan, 2p, 2p, 2013.06.
157. Agus SETYAWAN, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Potential Assessment of Ungaran Geothermal Prospect for Conventional Electric Power Production Deduced from Numerical Model, 九大地熱・火山研究報告, 21, 2-8, 第21号，pp.2-8, 2013.03.
158. Md. Bodruddoza MIA, Yasuhiro Fujimitsu, Monitoring Heat Losses Using Landsat ETM+ Thermal Infrared Data — A Case Study at Kuju Fumarolic Area in Japan, Acta Geophysica, 10.2478/s11600-013-0115-3, 17p., 2013.03.
159. Satoru HIGUCHI, Jun Nishijima, Yasuhiro Fujimitsu, Integration of Geothermal Exploration Data and Numerical Simulation Data Using GIS in a Hot Spring Area, Procedia Earth and Planetary Science, 10.1016/j.proeps.2013.01.024, 6, 177-186, 2013.03.
160. Taiki ARIMA, Yasuhiro Fujimitsu, Jun Nishijima, Estimation of Subsurface Structure in Western Fukuoka City from Gravity Data, Procedia Earth and Planetary Science, 10.1016/j.proeps.2013.01.022, 6, 163-168, 2013.03.
161. Daisuke OKA, Yasuhiro Fujimitsu, Jun Nishijima, Yoichi FUKUDA, Makoto TANIGUCHI, Mass Balance from Gravity in the Takigami Geothermal Reservoir, Oita Prefecture, Japan, Procedia Earth and Planetary Science, 10.1016/j.proeps.2013.01.020, 6, 145-154, 2013.03.
162. Md. Bodruddoza MIA, Yasuhiro Fujimitsu, Landsat Thermal Infrared Based Monitoring of Heat Losses from Kuju Fumaroles Area in Japan, Procedia Earth and Planetary Science, 10.1016/j.proeps.2013.01.016, 6, 114-120, 2013.03.
163. Md. Bodruddoza MIA, Chris J. BROMLEY, Yasuhiro Fujimitsu, Monitoring Heat Losses Using Landsat ETM+ Thermal Infrared Data: a Case Study in Unzen Geothermal Field, Kyushu, Japan, Pure and Applied Geophysics, 10.1007/s00024-013-0662-1, 9p., 2013.03.
164. Md. Bodruddoza MIA, Yasuhiro Fujimitsu, Chris J. BROMLEY, Estimation and Monitoring Heat Discharge Rates Using Landsat ETM+ Thermal Infrared Data: a Case Study in Unzen Geothermal Field, Kyushu, Japan, Proceedings of SPIE Asia-Pacific Remote Sensing 2012, 8524, 85240J-1-85240J-9, 2012.10.
165. Md. Bodruddoza MIA, Md. Nuruzzaman, Yasuhiro Fujimitsu, Effect of Upstream Dams of Teesta River on Surface Water Bodies in Northwest Bangladesh: A Satellite Remote Sensing Approach, Proceedings of 3rd International Conference on Environmental Aspects of Bangladesh (ICEAB 2012), 9-11, 2012.10.
166. Satoru HIGUCHI, Jun Nishijima, Yasuhiro Fujimitsu, Integration of Geothermal Exploration Data and Numerical Simulation Data Using GIS in a Hot Spring Area, Proceedings of International Symposium on Earth Science and Technology 2012, 191-196, 2012.09.
167. Taiki ARIMA, Yasuhiro Fujimitsu, Jun Nishijima, Estimation of Subsurface Structure in Western Fukuoka City from Gravity Data, Proceedings of International Symposium on Earth Science and Technology 2012, 171-176, 2012.09.
168. Daisuke OKA, Yasuhiro Fujimitsu, Jun Nishijima, Yoichi FUKUDA, Makoto TANIGUCHI, Mass Balance from Gravity in the Takigami Geothermal Reservoir, Oita Prefecture, Japan, Proceedings of International Symposium on Earth Science and Technology 2012, 157-162, 2012.09.
169. Md. Bodruddoza MIA, Yasuhiro Fujimitsu, Landsat Thermal Infrared Based Monitoring of Heat Losses from Kuju Fumaroles Area in Japan, Proceedings of International Symposium on Earth Science and Technology 2012, 135-140, 2012.09.
170. Md. Bodruddoza MIA, Yasuhiro Fujimitsu, Mapping hydrothermal altered mineral deposits using Landsat 7 ETM+ image in and around Kuju volcano, Kyushu, Japan, JOURNAL OF EARTH SYSTEM SCIENCE, 10.1007/s12040-012-0211-9, 121, 4, 1049-1057, 2012.08.
171. Md. Bodruddoza MIA, Chris J. BROMLEY, Yasuhiro Fujimitsu, Monitoring Heat Flux Using LANDSAT TM/ETM+ Thermal Infrared Data- A Case Study at Karapiti (‘Craters Of The Moon’) Thermal Area, New Zealand, Journal of Volcanology and Geothermal Research, 10.1016/j.jvolgeores.2012.05.005, 235-236, 1-10, Vol.235-236, pp.1-10, 2012.08.
172. Benyu SU, Yasuhiro Fujimitsu, Jian-yong SONG, Surface-borehole Electric Potential Survey in Layered Media and Its Applications, Journal of Central South University of Technology, 10.1007/s11771-012-1116-0, 19, 4, 1109-1115, Vol.19, No.4, pp.1109-1115, 2012.04.
173. Benyu SU, Yasuhiro Fujimitsu, Jing-Ling XU, Jian-yong SONG, A Model Study of Residual Oil Distribution Jointly Using Crosswell and Borehole-surface Electric Potential Methods, Applied Geophysics, 10.1007/s11770-012-0309-5, 9, 1, 19-26, Vol.9, No.1, pp.19-26, 2012.03.
174. Magmatic Hydrothermal System beneath Kuju Volcano, Japan, and Its Change after the 1995 Phreatic Eruption
Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Koichiro FUKUOKA and Masayuki OZAWA
Geothermal and Volcanological Research Report of Kyushu University, No.20, pp.134-141, March, 2012.
175. Accuracy Estimation of Heat Balance Technique -Comparison with Measured Values Using a Sheet Heating Element-
Shohei OSHIKATA and Yasuhiro FUJIMITSU
Geothermal and Volcanological Research Report of Kyushu University, No.20, pp.105-111, March, 2012.
176. Yayan SOFYAN, Shin YOSHIKAWA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Yoichi FUKUDA, Tsuneomi KAGIYAMA, Takahito KAZAMA and Daisuke OKA, Preliminary Result of Gravity Monitoring on Aso Volcanic Field, Central Kyushu, 九大地熱・火山研究報告, 20, 97-104, 第20号，pp.97-104, 2012.03.
177. Mohamed Abdel Zaher MAHMOUD, Hakim SAIBI, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Hany MESBAH and Sachio EHARA, Exploration and Assessment of the Geothermal Resources in the Hammam Faraun Hot Spring, Sinai Peninsula, Egypt, Journal of Asian Earth Sciences, 45, 256-267, Vol.45, pp.256-267, 2012.02.
178. Yayan SOFYAN, Yunus DAUD, Supriyanto SUPARNO, Ahmad YANI, Tommy HERDIANSYAH, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Sachio EHARA and Yoichi FUKUDA, Declined Mass Trends of Unbalanced Production to Recharge Activity in Kamojang Geothermal Field, Indonesia: a Continuous Monitoring with Hybrid Gravimetry, Proceedings of 37th Workshop on Geothermal Reservoir Engineering, Stanford University, 6p., CD-ROM, 6p., 2012.01.
179. Md. Bodruddoza MIA, Chris J. BROMLEY, Yasuhiro FUJIMITSU, Heat Flux Monitoring Using Satellite Based Imagery at Karapiti (Craters of the Moon) Fumarole Area, Taupo, New Zealand, Proceedings of 37th Workshop on Geothermal Reservoir Engineering, Stanford University, 6p., CD-ROM, 6p., 2012.01.
180. Daisuke OKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Yoichi FUKUDA and Makoto TANIGUCHI, Evaluation of Geothermal Reservoir Mass Change from the Gravity Change at the Takigami Geothermal Area, Oita Prefecture, Japan, Proceedings of 37th Workshop on Geothermal Reservoir Engineering, Stanford University, 6p., CD-ROM, 6p., 2012.01.
181. Benyu SU and Yasuhiro FUJIMITSU, Research on Heavy Oil Thermal Recovery by CO2 Steam Flooding with Help of Combination of Borehole-Surface Electric Potential and Cross-Borehole Electric Potential, Energy Exploration & Exploitation, 29, 6, 797-816, Vol.29, No.6, pp.797-816, 2011.12.
182. Md. Bodruddoza MIA and Yasuhiro FUJIMITSU, Study on Satellite Images Based Spectral Emissivity, Land Surface Temperature and Land-Cover in and Around Kuju Volcano, Central Kyushu, Japan, Journal of Advanced Science and Engineering Research, 1, 2, 177-191, Vol.1, No.2, pp.177-191, 2011.12.
183. Yayan SOFYAN, Yustin KAMAH, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Sachio EHARA, Yoichi FUKUDA and Makoto TANIGUCHI, Mass Variation in Outcome to High Production Activity in Kamojang Geothermal Field, Indonesia: A Reservoir Monitoring with Relative and Absolute Gravimetry, Earth, Planets and Space, 1, 2, 1157-1167, Vol.63, No.11, pp.1157-1167, 2011.11.
184. Yasuhiro FUJIMITSU and Jun NISHIJIMA, Exploration of Non-volcanic Hydrothermal Systems in Fukuoka Prefecture, Japan, by Gravity Surveys, 日本地熱学会誌, 33, 2, 87-92, 第33巻，第2号，pp.87-92, 2011.04.
185. Daisuke OKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Yoichi FUKUDA and Makoto TANIGUCHI, Geothermal Fluid Flow Monitoring by the Repeat Gravity Measurement at the Takigami Geothermal Field, Japan -Application of Hybrid Gravity Measurement by an Absolute Gravimeter (A10) and Relative Gravimeters (CG-3M and CG-5)-, Proceedings of 36th Workshop on Geothermal Reservoir Engineering, Stanford University, 6p., CD-ROM, 6p., 2011.01.
186. Mohamed Abdel Zaher MAHMOUD, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA, Assessment of Low-Temperature Geothermal Resource of Hammam Faraun Hot Spring, Sinai Peninsula, Egypt, Proceedings of 36th Workshop on Geothermal Reservoir Engineering, Stanford University, 984-989, pp.984-989, 2011.01.
187. Benyu SU and Yasuhiro FUJIMITSU, A Study on the Methodology for Hydrocarbon Saturation Evaluation in Low-porosity and Low-permeability Shaly Sandstone Reservoir, Proceedings of International Symposium on Earth Science and Technology 2010, 133-138, pp.387-391, 2010.12.
188. Daisuke OKA, Sachio EHARA and Yasuhiro FUJIMITSU, Numerical Simulation of a Non-volcanic Hydrothermal System Caused by Formation of a High Permeability Fracture Zone, Proceedings of International Symposium on Earth Science and Technology 2010, 133-138, pp.133-138, 2010.12.
189. Jun NISHIJIMA, Yasuhiro FUJIMITSU, Yayan SOFYAN, Yoichi FUKUDA, Takashi HASEGAWA and Makoto TANIGUCHI, A Geothermal Reservoir Monitoring Using an Absolute Gravity Measurement Around Takigami Geothermal Power Plant, Central Kyushu, Japan, RENEWABLE ENERGY 2010 Proceedings, CD-ROM, 2010.10.
190. Daisuke OKA, Sachio EHARA and Yasuhiro FUJIMITSU, Numerical Simulation of a Non-volcanic Hydrothermal System Caused by Formation of a High Permeability Fracture Zone, RENEWABLE ENERGY 2010 Proceedings, CD-ROM, 2010.10.
191. Yayan SOFYAN, Yunus DAUD, Yustin KAMAH, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA, Combined Repeat Gravity Measurement and Numerical Simulation for Geothermal Sustainability Monitoring -An Application to the Kamojang Geothermal Field-, RENEWABLE ENERGY 2010 Proceedings, CD-ROM, 2010.10.
192. Yasuhiro FUJIMITSU and Jun NISHIJIMA, Exploration of Non-volcanic Hydrothermal Systems in Fukuoka Prefecture, Japan, by Gravity Surveys, RENEWABLE ENERGY 2010 Proceedings, CD-ROM, 2010.10.
193. Evolution of a Non-volcanic Hydrothermal System Caused by Formation of a High Permeability Fracture Zone
Daisuke OKA, Sachio EHARA and Yasuhiro FUJIMITSU
Journal of the Geothermal Research Society of Japan, Vol.32, No.3, pp.193-202, July, 2010.
194. Hossein YOUSEFI, Younes NOOROLLAHI, Sachio EHARA, Ryuichi ITOI, Amin YOUSEFI, Yasuhiro FUJIMITSU, Jun NISHIJIMA and Kyuro SASAKI, Developing the Geothermal Resources Map of Iran, Geothermics, 39, 2, 140-151, Vol.39, Issue 2, pp.140-151, 2010.06.
195. Agus SETYAWAN, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA, An Estimate of the Resources Potential of Ungaran Geothermal Prospect for Indonesia Power Generation, Proceedings of the World Geothermal Congress 2010, CD-ROM, 2010.04.
196. Jun NISHIJIMA, Hakim SAIBI, Yayan SOFYAN, Sachio SHIMOSE, Yasuhiro FUJIMITSU, Sachio EHARA, Yoichi FUKUDA, Takashi HASEGAWA and Makoto TANIGUCHI, Reservoir Monitoring Using Hybrid Micro-Gravity Measurements in the Takigami Geothermal Field, Central Kyushu, Japan, Proceedings of the World Geothermal Congress 2010, CD-ROM, 2010.04.
197. Yasuhiro FUJIMITSU, Daisuke OKA and Sachio EHARA, Numerical Simulation for Development Process of a Non-Volcanic Hydrothermal System Caused by a Permeable Fracture Zone, Proceedings of the World Geothermal Congress 2010, CD-ROM, 2010.04.
198. Densed Gravity Survey around the Kego Fault, Fukuoka City
Jun NISHIJIMA, Yasuhiro FUJIMITSU and Yuuki FUKUI
Chikyu Monthly, Vol.32, No.4, pp.251-257, April, 2010.
199. Possibility of Earthquake Prediction at Fukuoka Area, Southwestern Japan Based on the Changes in Groundwater Level Part 3, An Essay- Scenario of Expected Kego Earthquake
Sachio EHARA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Shinsuke MAESHIBA and Nobuaki MATSUO
Western Regional Division Report of Natural Disaster Research Council, No. 34, pp.25-28, February, 2010.
200. Yayan SOFYAN, Yunus DAUD, Yustin KAMAH, Hakim SAIBI, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA, Monitoring of Mass Balance Model during Production Capacity Increase at Kamojang Geothermal Field, Indonesia, Proceedings of the 35th Annual Workshop on Geothermal Reservoir Engineering, Stanford Geothermal Workshop California, USA, CD-ROM, 2010.02.
201. Underground Structure Deduced from the Densed Gravity Survey at Northeastern Part of Fukuoka City
Yuuki FUKUI, Jun NISHIJIMA and Yasuhiro FUJIMITSU
Geothermal and Volcanological Research Report of Kyushu University, No.18, pp.19-26, December, 2009.
202. Yasuhiro FUJIMITSU, Jun NISHIJIMA and Atsushi YAMASHITA, Densely-arranged Gravity Surveys of Tagawa Fault in Oto Town, Fukuoka, Japan, 九大地熱・火山研究報告, 18, 9-18, 第18号，pp.9-18, 2009.12.
203. Yayan SOFYAN, Yunus DAUD, Yustin KAMAH, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA, Sustainable Production Plan in the Geothermal Energy Development -A Case Study of Kamojang Geothermal Field, Indonesia-, Proceedings of the 4th International Symposium on Novel Carbon Resource Sciences: Environmental Science and Technology, 141-147, pp.141-147, 2009.12.
204. Hossein YOUSEFI, Sachio EHARA and Yasuhiro FUJIMITSU, Noise Distribution Modeling and Environmental Risk Assessment of Geothermal Power Plants, Proceedings of International Symposium on Earth Science and Technology 2009, 529-534, pp.529-534, 2009.12.
205. Yasuhiro FUJIMITSU and Jun NISHIJIMA, Exploration of Underground Structure in Oto Town, Fukuoka Prefecture, Japan, by Gravity Survey, Proceedings of 31st New Zealand Geothermal Workshop 2009, 5p, 5p, 2009.11.
206. Yasuhiro FUJIMITSU, Koichiro FUKUOKA, Sachio EHARA, Hiroto TAKESHITA and Fuminori ABE, Evaluation of Subsurface Thermal Environmental Change Caused by a Ground-coupled Heat Pump System, Current Applied Physics, 10.1016/j.cap.2009.11.014, Online, DOI 10.1016/j.cap.2009.11.014, 4p, 2009.11.
207. Hossein YOUSEFI, Younes NOOROLLAHI, Sachio EHARA, Ryuichi ITOI, Amin YOUSEFI, Yasuhiro FUJIMITSU, Jun NISHIJIMA and Kyuro SASAKI, Developing the Geothermal Resources Map of Iran, Geothermics, 10.1016/j.geothermics.2009.11.001, Online, DOI 10.1016/j.geothermics.2009.11.001, 12p, 2009.11.
208. Agus SETYAWAN, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Hakim SAIBI and Essam ABOUD, The Gravity Anomaly of Ungaran Volcano, Indonesia: Analysis and Interpretation, 日本地熱学会誌, 31, 2, 107-116, 第31巻，第2号，pp.107-116, 2009.04.
209. Agus SETYAWAN, Sachio EHARA, Yasuhiro FUJIMITSU and Hakim SAIBI, Assessment of Geothermal Potential at Ungaran Volcano, Indonesia Deduced from Numerical Analysis, Proceedings of Thirty-Fourth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, SGR-TR-187, 2009.02.
210. Possibility of Earthquake Prediction at Fukuoka Area, Southwestern Japan Based on the Changes in Groundwater Level（Part 2）Restructuring of a Strategy of Deterministic Earthquake Prediction
Sachio EHARA, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Shinsuke MAESHIBA and Yoshiaki MATSUO
Western Regional Division Report of Natural Disaster Research Council, No.33, pp.63-66, February, 2009.
211. Hossein YOUSEFI, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA, Environmental Impact Assessment and Management System of Geothermal Energy Development, 九大地熱・火山研究報告, 第17号，pp.12-26, 2008.12.
212. Evolution of a Non-volcanic Hydrothermal System Caused by Formation of a High Permeability Fracture Zone
Daisuke OKA, Sachio EHARA and Yasuhiro FUJIMITSU
Geothermal and Volcanological Research Report of Kyushu University, No.17, pp.27-49, December, 2008.
213. Agus SETYAWAN, Sachio EHARA and Yasuhiro FUJIMITSU, Numerical Model of Hydrothermal System at Ungaran Volcano, Central Java, Indonesia, Proceedings of International Symposium on Earth Science and Technology 2008, pp.695-702, 2008.12.
214. Kohtaro ARARAGI, Sachio EHARA and Yasuhiro FUJIMITSU, Evolution of Thermal Processes Associated with the Activity of the Magma Chamber in the Kuju Volcanic Region, Central Kyushu, Japan, Proceedings of International Symposium on Earth Science and Technology 2008, pp.107-112, 2008.12.
215. Yasuhiro FUJIMITSU, Daisuke OKA, Sachio EHARA and Akira ONO, Development of a Non-volcanic Hydrothermal System Caused by a Permeable Fracture Zone, Proceedings of 30th New Zealand Geothermal Workshop 2008, pp.228-233, 2008.11.
216. Yasuhiro FUJIMITSU, Koichiro FUKUOKA, Sachio EHARA, Hiroto TAKESHITA and Fuminori ABE, Evaluation of Subsurface Thermal Environmental Change Caused by a Ground-coupled Heat Pump System, Proceedings of RENEWABLE ENERGY 2008, CD-ROM, 2008.10.
217. Hakim SAIBI, Jun NISHIJIMA, Tomohiro HIRANO, Yasuhiro FUJIMITSU and Sachio EHARA, Relation between Structure and Low-temperature Geothermal Systems in Fukuoka City, Southwestern Japan, Earth, Planets and Space, Vol. 60, No. 8, pp.821-826, 2008.09.
218. Yasuhiro FUJIMITSU, Sachio EHARA, Ryosuke OKI and Ryohei KANOU, Numerical Model of the Hydrothermal System beneath Unzen Volcano, Japan, Journal of Volcanology and Geothermal Research, Vol. 175, No. 1-2, pp.35-44, 2008.07.
219. Agus SETYAWAN, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Koichiro FUKUOKA and Hakim SAIBI, Integrated Geophysical Surveys of Ungaran Volcano: Understanding the Hydrothermal System, The 2nd International Workshop and Conference on Earth Resource Technology: Stepping Towards Sustainable Mining, Metallurgical and Petroleum Technology Development, Chulalongkorn University, Bangkok, Thailand , pp.14-19, 2008.04.
220. Possibility of Earthquake Prediction at Fukuoka Area, Southwestern Japan Based on the Changes in Groundwater Level
Sachio EHARA, Koichiro FUKUOKA, Yoshiaki MATSUO, Yasuhiro FUJIMITSU and Jun NISHIJIMA
Western Regional Division Report of Natural Disaster Research Council, No.32, pp.37-40, February, 2008.
221. Koichiro FUKUOKA, Sachio EHARA, Yasuhiro FUJIMITSU, Udi HARMOKO, Agus SETYAWAN, Lucas D. SETIJADJI, Agung HARIJOKO, Subagyo PRAMUMIJOYO, Yidi SETIADI, WAHYUDI, Interpretation of the 27 May 2006 Yogyakarta Earthquake Hypocenter and Subsurface Structure Deduced from the Aftershock and Gravity Data, Karnawati, D., Pramumijoyo, S., Anderson, R., Husein, S. (Eds.) The Yogyakarta Earthquake of May 27, 2006, Star Publishing Company, Inc., California, pp.5.1-5.10, 2008.01.
222. Influence of the Artificial Exhaust Heat and the Surface Radiation on the Heat Balance of Fukuoka City
Kenta UCHIHASHI, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Koichiro FUKUOKA and Mitsuo MATSUMOTO
Geothermal and Volcanological Research Report of Kyushu University, No.16, pp.75-82.
223. Environmental Impact Assessment for Sustainable Geothermal Energy Development
Hossein YOUSEFI, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA
Geothermal and Volcanological Research Report of Kyushu University, No.16, pp.56-63.
224. Fluid Flow Change of Reservoir Estimated by Gravity Change Observation at Takigami Geothermal Field, Oita Prefecture
Sachio SHIMOSE, Jun NISHIJIMA, Yasuhiro FUJIMITSU, Koichiro FUKUOKA and Sachio EHARA
Geothermal and Volcanological Research Report of Kyushu University, No.16, pp.40-45.
225. Numerical Investigation of Deep Thermal Structure in the Kuju Volcanic Region, Central Kyushu, Japan
Kohtaro ARARAGI, Sachio EHARA and Yasuhiro FUJIMITSU
Geothermal and Volcanological Research Report of Kyushu University, No.16, pp.14-25.
226. Yasuhiro FUJIMITSU, Agus SETYAWAN, Koichiro FUKUOKA, Jun NISHIJIMA, Sachio EHARA and Hakim SAIBI, Geophysical Investigations of Ungaran Volcano, Central Java, Indonesia, Proceedings of 29th New Zealand Geothermal Workshop 2007, CD-ROM, 2007.11.
227. Densed Gravity Survey at the Western Edge of Minou Fault
Kohei YOSHIDA, Jun NISHIJIMA and Yasuhiro FUJIMITSU
Proceedings of 117th Conference of Society of Engineering Geophysicists Japan, pp.359-362.
228. Estimation of Fault Structure Using Densed Gravity Survey Data at Fukuoka City (part 2)
Tomohiro HIRANO, Jun NISHIJIMA and Yasuhiro FUJIMITSU
Proceedings of 117th Conference of Society of Engineering Geophysicists Japan, pp.5-8.
229. Mitsuo MATSUMOTO, Sachio EHARA and Yasuhiro FUJIMITSU, Numerical Study of Pressurization Process in a Magma Reservoir with Crystallization and Volatile Exsolution: Comparison with the Periodicity of Eruptive Activities, Proceedings of International Workshop on Earth Resources Technology, pp.85-91, 2007.04.
230. Udi HARMOKO, Yasuhiro FUJIMITSU, Sachio EHARA, Shallow Ground Temperature Anomaly and Thermal Structure of Merapi Volcano, Central Java, Indonesia, 日本地熱学会誌, 第29巻，第1号，pp.25-37, 2007.01.
231. Yasuhiro FUJIMITSU, Toshiharu KIDO, Jun NISHIJIMA, Sachio EHARA, High-Accuracy Estimation of Heat Discharge Rates from Unzen Geothermal Area, Japan, Using Infrared Imagery by a Helicopter-Borne Thermo-Camera, RENEWABLE ENERGY 2006 Proceedings, p.1557-1560 (CD-ROM), 2007.01.
232. Jun NISHIJIMA, Yasuhiro FUJIMITSU, Sachio EHARA, Geothermal reservoir monitoring using repeat gravity measurement at Takigami geothermal field, central Kyushu, Japan, RENEWABLE ENERGY 2006 Proceedings, P.1601-1604 (CD-ROM), 2007.01.
233. Hydrothermal Numerical Simulation Model of Obama Geothermal Field
Hakim SAIBI, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA and Koichiro FUKUOKA
Geothermal and Volcanological Research Report of Kyushu University, No.15, pp.49-57.
234. Compiling a Volcanic Activity Database of Kuju Volcano and Evaluation of the Volcanic Activity after the 1995 Phreatic Eruption Based on the Database
Chisuga IDE, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA and Koichiro FUKUOKA
Geothermal and Volcanological Research Report of Kyushu University, No.15, pp.23-29.
235. Estimation of Fault Structure Using Densed Gravity Survey Data at Fukuoka City
Tomohiro HIRANO, Jun NISHIJIMA and Yasuhiro FUJIMITSU
Geothermal and Volcanological Research Report of Kyushu University, No.15, pp.16-22.
236. Interpretation of the 27 May 2006 Yogyakarta Earthquake Hypocenter and Subsurface Structure Deduced from the Aftershock and Gravity Data
Koichiro FUKUOKA, Sachio EHARA, Yasuhiro FUJIMITSU, Harmoko UDI, Agus SETYAWAN, Lucas Donny SETIADJI,Agung HARIJOKO, Subagyo PRAMUMIJOYO, Yudi SETIADJI, WAHYUDI
Geothermal and Volcanological Research Report of Kyushu University, No.15, pp.2-9.
237. Hakim SAIBI, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA, Variations in Geothermometry and Chemical Composition of Hot Spring Fluids in the Obama Geothermal Field, Southwestern Japan, Proceedings of 4th International Workshop on Earth Science and Technology, pp.329-339, 2006.12.
238. Agus SETYAWAN, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Koichiro FUKUOKA and WAHYUDI, Preliminary Study Hydrothermal System of Ungaran Volcano, Indonesia, Inferred from Geophysical Surveys, Proceedings of 4th International Workshop on Earth Science and Technology, pp.163-168, 2006.12.
239. 藤光康宏，西島　潤，平野智弘, Densely-arranged Gravity Survey in Fukuoka City, Japan -Relation between the Subsurface Structure and the Low Temperature Hydrothermal System of Fukuoka-, Proceedings of 28th New Zealand Geothermal Workshop 2006, CD-ROM, 2006.11.
240. Numerical Investigation on Cooling Process of a Magma Chamber in Geothermal System -Suggestion of a Numerical Model and Analysis of Early Cooling Process-
Mitsuo MATSUMOTO, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA
Journal of the Geothermal Resources Society of Japan, Vol. 28, No. 4.
241. サイビ　ハキム，江原幸雄，藤光康宏，西島　潤, アルジェリアにおける地熱開発の進展, 日本地熱学会誌, 第28巻，第4号，pp.383-397, 2006.10.
242. Geothermal Fluid Flow Model in Shimabara Peninsula
Yasuhiro FUJIMITSU, Sachio EHARA and Ryosuke OKI
Journal of the Geothermal Resources Society of Japan, Vol. 28, No. 4.
243. Estimation of Fault Structure Using Densed Gravity Survey Data at Fukuoka City
Jun NISHIJIMA, Tomohiro HIRANO and Yasuhiro FUJIMITSU
Proceedings of 115th conference of Society of Engineering Geophysicists Japan, pp.232-235, October, 2006.
244. 江原幸雄，福岡晃一郎，藤光康宏，西島　潤, Changes in Groundwater Level Prior to an Earthquake in the Off-shore Area West of Fukuoka Prefecture, Japan, on 20 March 2005 and Several Subsequent Large Aftershocks, Offering the Possibility of Deterministic Earthquake Prediction, Proceedings of the 3rd International Symposium and Exhibition on Earth Resources and Geological Engineering Education, CD-ROM, 2006.08.
245. Earthquake off Western Part of Fukuoka Prefecture on March 20, 2005 and High Density Gravity Anomaly Map
Jun NISHIJIMA, Yasuhiro FUJIMITSU, Koichiro FUKUOKA and Sachio EHARA
News of Western Japan NDIC, No. 35.
246. Possibility of Predictions for “the Fukuoka Earthquake” by Observation of Groundwater Level Change
Sachio EHARA, Koichiro FUKUOKA, Yasuhiro FUJIMITSU and Jun NISHIJIMA
News of Western Japan NDIC, No. 35.
247. Geothermal Fluid Flow Derived from Microseismic Observation -A Case Study of Kuju Volcanic Field, Central Kyushu, Japan-
Kenji KUBOTA, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA
Butsuri-Tansa (Geophysical Exploration), Vol. 59, No. 2.
248. Geophysical Observations at Kuju Volcano by KGVRS (1995-2005)
Kuju Geothermal and Volcanological Research Station
Yasuhiro FUJIMITSU, Jun NISHIJIMA, Koichiro FUKUOKA and Sachio EHARA
Geothermal and Volcanological Research Report of Kyushu University, No.14.
249. Densed Gravity Survey around the Kego fault, Fukuoka city
Jun NISHIJIMA, Tomohiro HIRANO and Yasuhiro FUJIMITSU
Geothermal and Volcanological Research Report of Kyushu University, No.14.
250. Sachio EHARA, Koichiro FUKUOKA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Udi HARMOKO and Mitsuo MATSUMOTO, Changes in Groundwater Level Prior to an Earthquake in the Off-shore Area West of Fukuoka Prefecture, Japan, on 20 March 2005 and Several Subsequent Large Aftershocks, Offering the Possibility of Deterministic Earthquake Prediction, 九大地熱・火山研究報告, 第14号，pp.32-40, 2005.12.
251. Mitsuo MATSUMOTO, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA, Numerical Investigation of the Early Stage of a Cooling Magma Chamber Considering Natural Convection, Vesiculation and Degassing, 九大地熱・火山研究報告, 第14号，pp.9-18, 2005.12.
252. High-accuracy Estimation of Heat Discharge Rates from the Geothermal Areas of Unzen by the Heat Balance Method
Toshiharu KIDO, Yasuhiro FUJIMITSU, Jun NISHIJIMA and Sachio EHARA
Geothermal and Volcanological Research Report of Kyushu University, No.14.
253. Udi HARMOKO, Sachio EHARA and Yasuhiro FUJIMITSU, The Hydrothermal Study of Merapi Volcano, Central Java, Indonesia, Proceedings of 3rd International Workshop on Earth Science and Technology, pp.251-258, 2005.12.
254. 藤光康宏・木戸俊晴・西島　潤・江原幸雄, Estimation of Heat Discharge Rates from Unzen Geothermal Area, Japan, by Using the Heat Balance Technique, Proceedings of 27th New Zealand Geothermal Workshop 2005, On-line Paper, 2005.10.
255. Changes in Groundwater Level and Seismic Activity before and after the Earthquake off Western Part of Fukuoka Prefecture on March 20, 2005
Koichiro FUKUOKA, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Harmoko UDI and Mitsuo MATSUMOTO
Proceedings of 113th conference of Society of Engineering Geophysicists Japan.
256. Sachio EHARA, Koji MORITA, Koichro FUKUOKA, Takashi KURODA, Kotaro SAKEMI, Yasuhiro FUJIMITSU and Jun NISHIJIMA, Development of a New Heating and Cooling System with the Downhole Coaxial Heat Exchanger (DCHE) and Ground-Source Heat Pumps, Proceedings of SB05 Tokyo, CD-ROM, 2005.09.
257. Changes in Groundwater before and after the Earthquake off Western Part of Fukuoka Prefecture on March 20, 2005
Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Koichro FUKUOKA, Udi HARMOKO, Kenji KUBOTA, Mitsuo MATSUMOTO, Saibi HAKIM, SURYANTINI, Keiko FUJINO, Tukasa ENDO, Takasi, KURODA, YuichI NARASAKI, Toshiharu KIDO, Kotaro SAKEMI, Chisuga IDE, Shin KAMIOKA, Tomohiro HIRANO and Yudai YAMAMOTO
NEWS of WESTERN JAPAN NDIC, No.33.
258. Earthquake off Western Part of Fukuoka Prefecture on March 20, 2005 and High Density Gravity Anomaly Map
Jun NISHIJIMA, Yasuhiro FUJIMITSU, Koichiro FUKUOKA and Sachio EHARA
NEWS of WESTERN JAPAN NDIC, NO.33.
259. Research and Development on an Integrated Airborne Geophysical Prospecting (ii)
Kenichiro KUSUNOKI, Hideshi KAIEDA, Hisatoshi ITO, Toru MOGI, Yoshikazu TANAKA, Yasuhiro FUJIMITSU, Youichi YUUKI and Development Group
Proceedings of 112th conference of Society of Engineering Geophysicists Japan.
260. 藤光康宏・加納良平・西島　潤・江原幸雄, Hydrothermal System after the 1990-95 Eruption near the Lava Dome of Unzen Volcano, Japan, Proceedings of World Geothermal Congress 2005, CD-ROM, 2005.05.
261. Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Koichiro FUKUOKA and Masayuki OZAWA, Change in the Thermal State in a Volcanic Geothermal Reservoir beneath an Active Fumarolic Field after the 1995 Phreatic Eruption of Kuju Volcano, Japan, Proceedings of World Geothermal Congress 2005, CD-ROM, 2005.05.
262. Koichiro FUKUOKA, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA, Change in the Shallow Resistivity Structure after 1995 Phreatic Eruption at Kuju Volcano, Japan, Proceedings of World Geothermal Congress 2005, CD-ROM, 2005.05.
263. Jun NISHIJIMA, Yasuhiro FUJIMITSU, Sachio EHARA, Etsuro KOUNO and Masao YAMAUCHI, Micro-Gravity Monitoring and Repeated GPS Survey at Hatchobaru Geothermal Field, Central Kyushu, Japan, Proceedings of World Geothermal Congress 2005, CD-ROM, 2005.05.
264. H. Kaieda, K. Kusunoki, H. Ito, T. Mogi, Y. Tanaka, Y. Fujimitsu, Y. Yuuki, An integrated airborne survey around Aso volcano in Kyushu, Japan, 75th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2005 Society of Exploration Geophysicists - 75th SEG International Exposition and Annual Meeting, SEG 2005, 10.1190/1.2144395, 609-612, 2005.01, An integrated airborne survey was conducted around Aso volcano in Kyushu, Japan. In this survey, four geophysically different methods; the electromagnetics, the magnetics, the infrared images and the gamma-ray spectrometry, were applied in almost same survey lines by using a same helicopter. Electric resistivity structure down to 800m, vertical magnetic gradient map, temperature distribution on the ground surface and total gamma-ray intensity map were estimated and produced by the survey. These results were confirmed by comparing with the geology and the ground survey results in the survey area..
265. Hakim SAIBI, Jun NISHIJIMA, Sachio EHARA, Yasuhiro FUJIMITSU and Koichiro FUKUOKA, Determination of Shallow Groundwater Level Change Using Repeat Gravity Measurements at the Central Part of Unzen Volcano (Nagasaki Prefecture, Japan) from 1999 to 2004, Proceedings of 30th Annual Workshop Geothermal Reservoir Engineering, Stanford Geothermal Workshop, pp.201-208, 2005.01.
266. Koichiro FUKUOKA, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Reconnaissance Geophysical Surveys at Ungaran VoIcano, Central Java, Indonesia, Proc. of AUN-SEED-Net Fieldwise-Seminar and International Symposium, pp. 54-63, 2004.12.
267. Sachio EHARA, Koji MORITA, Koichiro FUKUOKA, Takashi KURODA, Kotaro SAKEMI, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Development of a New Heating and Cooling System for the House with the Downhole Coaxial Heat Exchanger (DCHE) and Ground-Source Heat Pumps, Proc. of First International Workshop on Sustainable Habitat Systems, pp. 41-44, 2004.12.
268. Study on High-accuracy Estimation of Heat Discharge Rate by Heat Balance Technique -Observation of Unzen Geothermal Area by Heliborne Infrared Thermal Imager-
Yasuhiro FUJIMITSU, Toshiharu KIDO, Jun NISHIJIMA, Sachio EHARA and Tomoya AKIRA
Geothermal and Volcanological Research Report of Kyushu University, No.13.
269. Research of Underground Structure at Obama Hot Spring Area in Nagasaki -Comparison the Results of Observation with Existing Data of Hot Springs-
Tsukasa ENDO, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA
Geothermal and Volcanological Research Report of Kyushu University, No.13.
270. The Design of Air Conditioning System for Homeothermic Gravity Room Utilizing the Thermal Functions of the Ground -Basic Design of the System and the Prediction of Operational Performance by Numerical Simulation-
Takashi KURODA, Koji MORITA, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA
Geothermal and Volcanological Research Report of Kyushu University, No.13.
271. 藤光康宏・大木良介・江原幸雄, Temperature Estimation around the Conduit of the 1990-95 Eruption at Unzen Volcano by Numerical Simulation, Proc. of 26th New Zealand Geothermal Workshop 2004, pp. 100-103, 2004.12.
272. Hakim SAIBI, Sachio EHARA, Yasuhiro FUJIMITSU and Jun NISHIJIMA, Aquifer Chemistry of Thermal Waters in Obama Geothermal Field, Japan -Between 1984 and 2001, Proc. of 26th New Zealand Geothermal Workshop 2004, pp. 29-35, 2004.12.
273. Takashi KURODA, Koji MORITA, Jun NISHIJIMA, Yasuhiro FUJIMITSU and Sachio EHARA, Design of Air Conditioning System with a Ground-coupled Heat Pump for a Gravity Meter Room, Proc. of 26th New Zealand Geothermal Workshop 2004, pp. 88-94, 2004.12.
274. Udi HARMOKO, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Change in Hypocenters after the July 1998 Eruption at Merapi VoIcano, Central Java, Indonesia, Proc. of 2nd International Workshop on Earth Science and Technology, pp. 21-26, 2004.12.
275. Hakim SAIBI, Sachio EHARA, Yasuhiro FUJIMITSU, Jun NISHIJIMA, Geochemistry and Geothermometry of Hot Waters from the Obama Geothermal Field, between 1984 and 2001, Proc. of 2nd International Workshop on Earth Science and Technology, pp. 27-34, 2004.12.
276. H. Kaieda, K. Kusunoki, H. Ito, T. Mogi, Y. Tanaka, Yasuhiro Fujimitsu, T. Igarashi, Development of an integrated airborne survey, SEG Technical Program Expanded Abstracts, 10.1190/1.1842422, 23, 1, 833-836, 2004.01, We have started to develop an integrated airborne survey system for three years from FY2003 to FY2005. In this system, we designed that the system could not only investigate underground structure but also survey water and temperature distribution for contributing disaster prediction. For these purposes, we will apply four geophysically different methods; the electromagnetics, the magnetics, the infrared images and the gamma-ray spectrometry in one survey and repeat this survey to monitor the underground structure and water and temperature distribution changes. In FY2003, a new electromagnetic survey system was designed and manufactured to investigate the underground structure to a depth of more than 300 m up to 1,000 m. Data acquisition and processing methods for the magnetics, the infrared images and the gamma-ray spectrometry were developed..
277. Interpretation of Various Kinds of Geophysical and Geochemical Observations at Unzen Volcano
R. Ohki, Y. Fujimitsu, J. Nishijima and S. Ehara
Geothermal and Volcanological Research Report of Kyushu University, No.12.
278. Simultaneous Geophysical Observations at Kuju Volcano, Central Kyushu, Japan
K. Fukuoka, S. Ehara, Y. Fujimitsu and J. Nishijima
Geothermal and Volcanological Research Report of Kyushu University, No.12.
279. Cooling of the Shallow Subsurface Beneath Kuju Volcano, Central Kyushu, Japan Deduced from Geomagnetic Changes
M. Ozawa, K. Fukuoka, J. Nishijima, Y. Fujimitsu and S. Ehara
Geothermal and Volcanological Research Report of Kyushu University, No.12.
280. 藤光康宏・加納良平, Numerical Modelling of the Hydrothermal System in Unzen Volcano, Japan, Proceedings of 25th New Zealand Geothermal Workshop 2003, pp.173-178, 2003.11.
281. 小澤正幸・福岡晃一郎・西島　潤・藤光康宏・江原幸雄, Cooling of the Shallow Subsurface beneath Kuju Volcano, Central Kyushu, Japan Deduced from Geomagnetic Changes, Proceedings of 25th New Zealand Geothermal Workshop 2003, pp.127-130, 2003.11.
282. 宇野木理恵・糸井龍一・福岡晃一郎・藤光康宏・江原幸雄, Soil Air Gas and Gamma-ray Surveys at Unzen Volcano, Japan, Proceedings of 25th New Zealand Geothermal Workshop 2003, pp.137-141, 2003.11.
283. 藤光康宏・西島　潤・大場　裕・江原幸雄, Low Temperature Hydrothermal System in the Southern Area of Fukuoka City, Japan, Proceedings of 38th International Conference of Societe Internationale des Techniques Hydrothermales, pp.119-124, 2003.09.
284. Remote Observation of Volcanic Gases by FT-IR at Unzen Volcano
T. Hirao, Y. Fujimitsu, J. Nishijima and S. Ehara
Geothermal and Volcanological Research Report of Kyushu University, No.11.
285. Cooling of the Heat Source beneath Kuju-Iwoyama Deduced from Geomagnetic Changes
M. Ozawa, K. Fukuoka, J. Nishijima, Y. Fujimitsu and S. Ehara
Geothermal and Volcanological Research Report of Kyushu University, No.11.
286. Underground Structure of Low Temperature Hydrothermal System -A Case Study of the Ijiri Area, Southern Part of Fukuoka City-
Y. Oba, J. Nishijima, Y. Fujimitsu and S. Ehara
Geothermal and Volcanological Research Report of Kyushu University, No.11.
287. Quick Cooling of a Volcano after a Phreatic Eruption -A Case Study of 1995 Phreatic Eruption of Kuju Volcano, Central Kyushu, Japan-
S. Ehara, Y. Fujimitsu, J. Nishijima, K. Fukuoka and M. Ozawa
Chikyu Monthly, S39.
288. Repeated Microgravity Observations, GPS Survey and Continuous Tilt Measurements in Kuju Volcano
J. Nishijima, S. Ehara and Y. Fujimitsu
Chikyu Monthly, S39.
289. 藤光康宏・江原幸雄・西島　潤・加納良平・平尾龍也, Study on Hydrothermal System Development, Unzen Volcano, Japan: A Topic in Phase I of the Unzen Scientific Drilling Project, Proceedings of 24th New Zealand Geothermal Workshop 2002, pp.283-287, 2002.11.
290. 江原幸雄・藤光康宏・西島　潤・福岡晃一郎・小澤正幸, Quick Cooling of Kuju Volcano, Central Kyushu, Japan after the 1995 Phreatic Eruption, Proceedings of 24th New Zealand Geothermal Workshop 2002, pp.279-282, 2002.11.
291. 西島　潤・藤光康宏・江原幸雄, Repeated Microgravity Observations, GPS Survey and Continuous Tilt Measurements in Kuju Volcano, Central Kyushu, Japan, Proceedings of 24th New Zealand Geothermal Workshop 2002, pp.159-164, 2002.11.
292. Subsurface Structure of Kego Fault, Fukuoka, inferred from the Gravity Exploration (Part 2)
J. Nishijima, Y. Fujimitsu, S. Ehara, K. Fukuoka, D. Gerovska, T. Mogi, M. Kawaguchi and T. Kato
Proceedings of the 107th SEGJ Conference.
293. 江原幸雄・藤光康宏・西島　潤, Multi-parameter Monitoring of a Volcanic Geothermal Reservoir beneath Kuju Volcano by Laboratory of Geothermics, Kyushu University, Proceedings of Special Workshop on Earth Science and Technology, pp.101-104, 2002.09.
294. 藤光康宏・加納良平・西島　潤・江原幸雄・平尾龍也, Investigation and Modeling of Hydrothermal System of Unzen Volcano, Japan -A Study in the Unzen Scientific Drilling Project-, International Workshop on Intelligent Mining Systems, pp.15-20, 2002.04.
295. Comparison of Thermal Structures beneath Central Kyushu of Japan and Northeastern Part of Continental China
S. Ehara, Y. Fujimitsu and J. Nishijima
Proceedings of Meeting 13K-7, DPRI, Kyoto University.
296. Variation of Steam Discharge Activity during the Declining Stage of 2000 Eruption of Usu Volcano
S. Ehara, Y. Fujimitsu, J. Nishijima, K. Fukuoka, T. Kudo, H. Shibata, M. Kawaguchi, D. Gerovska and X. Han
Geophysical Bulletin of Hokkaido University No.65.
297. 江原幸雄・藤光康宏・西島　潤, Monitoring of a Volcanic Geothermal Reservoir through Multi-parameter Measurements -A Case Study of the Central Part of Kuju Volcano, Japan-, Proceedings of the 27th Workshop on Geothermal Reservoir Engineering, Stanford University, California, pp.379-381, 2002.01.
298. S. Ehara, Y. Fujimitsu and J. Nishijima
Chikyu Monthly, Vol.23, No.8, pp.528-534.
299. Development of a Hydrothermal Systems by Conductive Cooling of the Heat Source -A Case Study of Kakkonda Geothermal System, Japan-
S. Ehara, Y. Fujimitsu, S. Yamakawa and H. Baba
Journal of the Geothermal Research Society of Japan, Vol.23, No.1, pp.11-23.
300. Koichi Suzuki, Shinji Toda, Kenichiro Kusunoki, Yasuhiro Fujimitsu, Tohru Mogi, Akira Jomori, Case studies of electrical and electromagnetic methods applied to mapping active faults beneath the thick quaternary, Developments in Geotechnical Engineering, 10.1016/S0165-1250(00)80005-X, 84, C, 29-45, 2000.12, It is of considerable importance to explore the geological structure around active faults, especially near-surface unconsolidated layers, to estimate the faults' activity. There are numerous case studies to investigate active faults using geophysical exploration methods; however, only a few cases have been verified in detail by comparison with other geological information. We have applied electric and electromagnetic methods, which can be effective for exploring to several hundred meters depth, to reveal geological structures covered by thick Quaternary formations at four active fault sites in Japan. In this paper, we used the controlled source audio-frequency magnetotelluric (CSAMT) method, the direct current (dc) resistivity method, and the resistivity tomography method. The resistivity profiles were analyzed by two-dimensional inversion techniques, and the resulting models were verified by comparison with geological evidence obtained by drilling or trenching. Our results are as follows. (1) CSAMT is an effective method for defining an outline of geological structures around a fault to several hundred meters deep. It enables us to define a resistivity boundary between different kinds of bedrock with a fault contact. (2) The dc resistivity method distinguishes each sedimentary unit as a different resistivity zone and detects the vertical displacement in the Quaternary formations. (3) The resistivity tomography method is useful to determine in more detail the flexure structure produced by faulting. Using these latter two methods, we can select drilling positions and trenching locations. In addition, it is verified from the data measured along trench walls and electrical logging that the resistivity of softsedimentary layers and clayey cataclastic bedrock conforms to the relationship established between the resistivity and the clay content. These resistivity methods have the advantages of detecting clayey layers as very low resistivity zones. The overall conclusion is that the combination of these resistivity methods provides us with more detailed and accurate information for estimating fault activity..
301. Gravity Monitoring of Geothermal Reservoirs in the Takigami Geothermal Field, Central Kyushu, Japan -Gravity Changes Caused by Production and Reinjection of Geothermal Fluids-
Jun NISHIJIMA, Noriko SHIMOSAKO, Tatsuya MOTOYAMA, Yasuhiro FUJIMITSU, Sachio EHARA, Kazuhiro IKEDAY, Chitoshi AKASAKA, Shigetsugu FURUYA, Hiroki GoTOH and Toshiro MOTOMATSU
Journal of the Geothermal Research Society of Japan, Vol.22, No.2, pp.117-129.
302. Koichi Suzuki, Shinji Toda, Kenichiro Kusunoki, Yasuhiro Fujimitsu, Tohru Mogi, Akira Jomori, Case studies of electrical and electromagnetic methods applied to mapping active faults beneath the thick Quaternary, Engineering Geology, 10.1016/S0013-7952(99)00132-5, 56, 1-2, 29-45, 2000.04, It is of considerable importance to explore the geological structure around active faults, especially near-surface unconsolidated layers, to estimate the faults' activity. There are numerous case studies to investigate active faults using geophysical exploration methods; however, only a few cases have been verified in detail by comparison with other geological information. We have applied electric and electromagnetic methods, which can be effective for exploring to several hundred meters depth, to reveal geological structures covered by thick Quaternary formations at four active fault sites in Japan. In this paper, we used the controlled source audio-frequency magnetotelluric (CSAMT) method, the direct current (dc) resistivity method, and the resistivity tomography method. The resistivity profiles were analyzed by two-dimensional inversion techniques, and the resulting models were verified by comparison with geological evidence obtained by drilling or trenching. Our results are as follows. (1) CSAMT is an effective method for defining an outline of geological structures around a fault to several hundred meters deep. It enables us to define a resistivity boundary between different kinds of bedrock with a fault contact. (2) The dc resistivity method distinguishes each sedimentary unit as a different resistivity zone and detects the vertical displacement in the Quaternary formations. (3) The resistivity tomography method is useful to determine in more detail the flexure structure produced by faulting. Using these latter two methods, we can select drilling positions and trenching locations. In addition, it is verified from the data measured along trench walls and electrical logging that the resistivity of soft-sedimentary layers and clayey cataclastic bedrock conforms to the relationship established between the resistivity and the clay content. These resistivity methods have the advantages of detecting clayey layers as very low resistivity zones. The overall conclusion is that the combination of these resistivity methods provides us with more detailed and accurate information for estimating fault activity. (C) 2000 Elsevier Science B.V. All rights reserved..
303. 藤光康宏・江原幸雄・中野裕一・西島　潤・小屋政裕, Water Discharge and Recharge Balance of Kuju Volcano, Japan, Deduced from Thermal and Gravity Measurements, Geothermal Resources Council Transactions, Vol.23, pp.415-418, 1999.10.
304. Jun Nishijima, Yasuhiro Fujimitsu, Sachio Ehara, Tatsuya Motoyama, Noriko Simosako, Reservoir monitoring by observation of gravity changes at the Takigami geothermal field, central Kyushu, Japan, Transactions - Geothermal Resources Council, 23, 425-431, 1999.10, Repeat gravity measurement have been conducted at the Takigami geothermal field in Kyushu, Japan in order to monitor the underground geothermal fluid flow system. Gravity changes at 26 stations have been monitored since May 1991 to study reservoir behavior. The observed gravity changes included gravity changes due to shallow ground water level change. We removed the effect of shallow ground water level change on gravity by applying a statistical technique to isolate the gravity change due to the mass change associated with the commencement of the production and reinjection of geothermal fluids at the Takigami geothermal power station in November 1996. Multivariate regression analysis was applied in order to establish the relationship between gravity and precipitation; a good correlation was obtained. Therefore, it is now possible to estimate the gravity change due to ground water level change at each observation point by using the precipitation data collected prior to the gravity measurement. We thereby define the residual gravity, which is the observed gravity minus this estimated gravity. The results of repeat gravity measurement show that repeat gravity surveys is an effective method to monitor the underground hydrological systems..
305. Alamta Singarimbun, Sachio Ehara, Yasuhiro Fujimitsu, A numerical model of magmatic hydrothermal system and its application to Kuju volcano, central Kyushu, Japan, Memoirs of the Kyushu University, Faculty of Engineering, 56, 4, 229-243, 1996.12, The objective of this study is to develop a new numerical simulator for the investigation of thermal processes in the high temperature reservoir, which is part of the magmatic hydrothermal system. In this study the finite difference method (FDM) based on the mass and heat balance equations is used to obtain the pressure and the enthalpy distribution in the reservoir. The derived pressure and enthalpy are used to calculate the other parameters (thermodynamic properties of fluid). These parameters represent the thermal state of the fluid in the reservoir (liquid phase, two phase and superheated steam conditions). The development of the magmatic hydrothermal system is calculated by using the transient flow rate of magmatic water discharged from a magma chamber as a boundary condition at the bottom of the reservoir. This concept is applied to simulate the thermal processes beneath Kuju volcano, central Kyushu, Japan. In the numerical simulation, the initial condition of the reservoir is a liquid phase. Accompanying the development of the reservoir supplied by magmatic water, the fluid phase in the reservoir changes with time from liquid to two phase and superheated state. These processes interpret the development of magmatic hydrothermal system beneath Kuju volcano..
306. Experimental Study on Temperature Dependence of Resistivity of Dried Rocks
Toyohisa FUJITA, Yasuhiro FUJIMITSU, Satoshi AKIBAYASHI, Hiroyuki KOSUKEGAWA, Yuji YAMAMOTO and Toshio MIZUTA
Journal of the Geothermal Resources Society of Japan, Vol. 17, No. 2.
307. Application of Seismic, Resistivity and Radar Geotomographies for Surveying Geological Properties
Koichi SUZUKI, Ken-ichiro KUSUNOKI and Yasuhiro FUJIMITSU
Soil mechanics and foundation engineering, Vol. 42, No. 5.
308. Geophysical Exploration for Hot Dry Rock Geothermal Energy Development
Yoshinao HORI, Hideshi KAIEDA and Yasuhiro FUJIMITSU
Butsuri-Tansa (Geophysical Exploration), Vol. 44, No. 6.
309. Modeling of Geothermal Area by Simulation of Hydrothermal System
Yasuhiro FUJIMITSU
Electric Power Civil Engineering, No.234.
310. Numerical Model of Takenoyu-Sugawara Geothermal Area and an Interpretation of a Low Resistivity Zone with KYU88-1, the Simulator for Thermal Water Flow
Yasuhiro FUJIMITSU, Kozo YUHARA
Journal of the Geothermal Resources Society of Japan, Vol. 11, No. 4.
311. Kozo YUHARA, Yasuhiro FUJIMITSU, Takashi Okabe, Simulation of the Hydrothermal System at Hirayu Hot Springs, Japan, Hydrogeological Regimes and Their Subsurface Thermal Effects, Geophysical Monograph 47, IUGG Volume 2, pp. 107-118, 1989.01.
312. A Comparison of the ELF-MT Resistivity Structure and the Thermal Structure in Takenoyu Geothermal Area
Tohru MOGI, Sachio EHARA, Kozo YUHARA, Keishi ASOSHINA and Yasuhiro FUJIMITSU
Journal of the Geothermal Resources Society of Japan, Vol. 9, No. 3.
313. Infrared Imageries of Volcanic and Geothermal Areas in Kyushu by Helicopter
Kozo YUHARA, Sachio EHARA, Miyuki HARA and Yasuhiro FUJIMITSU
Journal of the Geothermal Resources Society of Japan, Vol. 9, No. 4.
314. Heat Discharge and Flow System of Obama Hot Springs, Nagasaki Prefecture
Kozo YUHARA, Sachio EHARA, Masao FUTAGOISHI and Yasuhiro FUJIMITSU
Journal of the Balneological Society of Japan, Vol. 37, No. 1.


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