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Systematic understanding of magmatic hydrothermal system and reexamination of deep magma energy extraction

Research Project

Project/Area Number 14205152
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

EHARA Sachio  Kyushu University, Faculty of Engineering, Professor, 工学研究院, 教授 (10002346)

Co-Investigator(Kenkyū-buntansha) ITOI Ryuichi  Kyushu University, Faculty of Engineering, Professor, 工学研究院, 教授 (50108768)
FUJIMITSU Yasuhiro  Kyushu University, Faculty of Engineering, Associate Professor, 工学研究院, 助教授 (10264095)
NISHIJIMA Jun  Kyushu University, Faculty of Engineering, Research Associate, 工学研究院, 助手 (40315114)
Project Period (FY) 2002 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥30,160,000 (Direct Cost: ¥23,200,000、Indirect Cost: ¥6,960,000)
Fiscal Year 2005: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2003: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2002: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Keywordsvolcano energy / geothermal energy / heat extraction / volcanic eruption / volcano / Kuju volcano / monitoring / underground structure
Research Abstract

Geophysical monitoring system was installed in order to clarify the physical changes after the 1995 phreatic eruption of Kuju volcano, central Kyushu, Japan. The observational results were summarized as follows based on the data base which is consisted of thermal, geomagnetic, seismic, and gravity data.
(1)Changes in surface temperature and magnetization of the volcanic body show the quick and continuous cooling of the volcanic body after the 1995 phreatic eruption.
(2)Decrease in gravity at the central part of the volcano and decrease in steam discharge rate show that the quick and continuous cooling of the volcano was caused by the cold meteoric water recharge to the central part of the volcano. Such cold water recharge was induced by the sudden decrease in pressure of the volcanic geothermal reservoir accompanying with the phreatic eruption.
(3)The above quick and continuous cooling of the volcano was well simulated numerically. The numerical model is a three dimensional and transient model.
(4)The depths of volcanic earthquakes became deeper after the 1995 phreatic eruption. The physical mechanism of deepening of the hypocenters was interpreted in terms of the underground temperature decrease after the 1995 phreatic eruption.
(5)A numerical simulation code which includes the detailed degassing process accompanying with the cooling of magma was developed. The magmatic water discharge rate several tens thousands of years after the commencement of the magma cooling was estimated at several tens kg/sec which is similar to the present magmatic water discharge rate from Kuju volcano.
The present thermal structure beneath Kuju volcano was clarified based on the geophysical observations and numerical modeling. The thermal process after the 1995 phreatic eruption of Kuju volcano was similar to the geothermal fluid production without reinjection. This result implies a possible option of volcano energy utilization at Kuju volcano.

Report

(5 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (37 results)

All 2005 2004 Other

All Journal Article (24 results) Publications (13 results)

  • [Journal Article] Change in thermal state in a volcanic geothermal reservoir beneath an active fumarolic field after the 1995 phreatic eruption of Kuju volcano, Japan2005

    • Author(s)
      Ehara, S., Fujimitsu, Y., Nishijima, J.et al.
    • Journal Title

      Proc. World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Change in the shallow resistivity structure after the 1995 phreatic eruption at Kuju volcano, Japan2005

    • Author(s)
      Fukuoka, K., Ehara, S., Fujimitsu, Y., Nishijima,J.
    • Journal Title

      Proc. World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Micro-gravity monitoring and repeated GPS survey at Hatchobaru geothermal field, central Kyusyu, Japan2005

    • Author(s)
      Nishijima, J., Fujimitsu, Y., Ehara, S., Fukuoka, K.et al.
    • Journal Title

      Proc. World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Case studies on small-scale power generation with the Downhole Coaxial Heat Exchanger2005

    • Author(s)
      Morita, K., Tago, M., Ehara, S.
    • Journal Title

      Proc. World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The hydrothermal system of Merapi volcano, central Jawa, Indonesia2005

    • Author(s)
      Udi, Harmoko, Ehara, S., Fujimitsu, Y.
    • Journal Title

      Proc. 3^<rd> International Workshop on earth Science and Technology

      Pages: 251-258

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 坑井内同軸交換器を用いる小規模地熱発電システムの運転特性の検討2005

    • Author(s)
      盛田耕二, 田子 真, 江原幸雄
    • Journal Title

      日本地熱学会誌 27巻2号

      Pages: 149-162

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Change in thermal state in a volcanic geothermal reservoir beneath an active fumarolic field after the 1995 phreatic eruption of Kuju volcano, Japan2005

    • Author(s)
      S.Ehara, Y.Fujimitsu, J.Nishijima et al.
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Change in the shallow resistivity structure after the 1995 phreatic eruption at Kuju volcano, Japan2005

    • Author(s)
      K.Fukuoka, S.Ehara, Y.Fujimitsu, J.Nishijima
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Micro-gravity Monitoring and repeated GPS survey at Hatchobaru geothermal field, central Kyushu, Japan2005

    • Author(s)
      J.Nishijima, Y.Fujimitsu, S.Ehara, et al.
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Case studies on small -scale power generation with the Downhole Coaxial Heat Exchanger2005

    • Author(s)
      K.Morita, M.Tago, S.Ehara
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The hydrothermal system of Merapi volcano, central Jawa, Indoneshia2005

    • Author(s)
      U.Harmoko, S.Ehara, Y.Fujimitsu
    • Journal Title

      Proc.3^<rd> International Workshop on Eart Science and Technology

      Pages: 251-258

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Case studies on small-scale power generation with the Down Hole Coaxial Heat Exchanger2005

    • Author(s)
      K.Morita, M.Tago, S.Ehara
    • Journal Title

      J.Geotherm Res.Soc.of Japan Vol.27, No.2

      Pages: 149-162

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Change in thermal state in a volcanic geothermal reservoir beneath an active fumarolic field after the 1995 phreatic eruption of Kuju volcano, Japan2005

    • Author(s)
      Ehara, S, Fujimitsu, Y., Nishijima, J. et al.
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Change in the shallow resistivity structure after the 1995 phreatic eruption at Kuju volcano, Japan2005

    • Author(s)
      Fukuoka, K., Ehara, S., Fujimitsu, Y., Nishijima, J.
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Micro-gravity monitoring and repeated GPS survey at Hatchobaru geothermal field, central Kyushu, Japan2005

    • Author(s)
      Nishijima, J., Fujimitsu, Y., Ehara, S, Fukuoka, K.et al.
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Case studies on small-scale power generation with the Downhole Coaxial Heat Exchanger2005

    • Author(s)
      Morita, K., Tago, M., Ehara, S.
    • Journal Title

      Proc.World Geothermal Congress 2005 (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] The hydrothermal system of Merapi volcano, central Java, Indonesia2005

    • Author(s)
      Udi Hrmoko, Ehara, S., Fujimitsu, Y.
    • Journal Title

      Proc.3rd International Workshop on Earth Science and Technology,

      Pages: 251-258

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 坑井内同軸熱交換器を用いる小規模地熱発電システムの運転特性の検討2005

    • Author(s)
      盛田耕二, 田子 真, 江原幸雄
    • Journal Title

      日本地熱学会誌 27巻2号

      Pages: 149-162

    • NAID

      10015696238

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 地熱資源の持続可能性に対する観測的立場からの検討2004

    • Author(s)
      江原幸雄, 西島 潤
    • Journal Title

      日本地熱学会誌 26巻2号

      Pages: 181-193

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 地熱資源の持続可能な開発利用に関するオーガナイズトセッションの総括2004

    • Author(s)
      江原幸雄
    • Journal Title

      日本地熱学会誌 26巻2号

      Pages: 123-133

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 長崎県小浜町総合自然エネルギー特区における地熱エネルギー利用計画2004

    • Author(s)
      藤野敏雄, 江原幸雄, 今崎正敏
    • Journal Title

      地熱技術 29巻3/4号

      Pages: 57-68

    • NAID

      40006541116

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Change in hypocenters after the July 1998 eruption at Merapi, central Java, Indonesia2004

    • Author(s)
      Harumoko, Udi, Ehara, S. et al.
    • Journal Title

      Proceeding, of 2^<nd> International Workshop of Earth Science and Technology

      Pages: 21-26

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Geochemistry and geothermometry of hot waters from the Obama geothermal field, between 1984 and 20012004

    • Author(s)
      Saibi, H., Ehara, S.et al.
    • Journal Title

      Proceedings of 2^<nd> International Workshop on Earth Science and Technology

      Pages: 27-34

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Reconnaissance geophysical surveys at Ungaran volcano, central Java, Indonesia2004

    • Author(s)
      Fukuoka, K., Ehara, S.et al.
    • Journal Title

      Proceedings of AUN-SEED NET Fieldwise-seminar and International Sympojium

      Pages: 54-63

    • Related Report
      2004 Annual Research Report
  • [Publications] 江原幸雄, 西島潤: "九重火山1995年噴火の終息過程と次期噴火に向けての観測準備"自然災害研究協議会西部地区部会報・論文集. 27号. 45-48 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 江原幸雄, 福岡晃一郎, 大木良介, 田口幸洋: "1995年九重火山水蒸気爆発後の噴気地域下の熱的状態の変化"日本地熱学会誌. 25巻3号. 179-192 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Ozawa, Fujkuoka, Nishijima, Fujimitsu, Ehara: "Cooling of the shallow subsurface beneath kuju volcano, central Kyushu, Japan deduced from geomagnetic changes"Proceedings of 25^<th> New Zealand Geothermal Workshop 2003. 25. 127-130 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Ohki, Ehara, Fukuoka, Taguchi: "Drastic change of the thermal state beneath an active fumarolic field before and after the 1995 phreatic eruption of Kuju volcano, Japan"Proceedings of 25^<th> New Zealand Geothermal Workshop 2003. 25. 131-136 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 福岡晃一郎, 江原幸雄, 藤光康宏, 西島 潤: "九重火山における複数の地球物理学的手法を用いた同時連続観測"九大地熱・火山研究報告. 第12号. 2-9 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 三小田昌史, 西島 潤, 江原幸雄: "九重火山における高精度傾斜計による地盤変動解析"九大地熱・火山研究報告. 第12号. 30-39 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 江原幸雄, 糸井龍一, 渡邊公一郎: "中国大陸の火山・地熱・温泉-フィールド調査からみた自然の一断面-"九州大学出版会. 181 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Ehara, Y.Hujimitsu, J.Nishijima, K.Fukuoka, M.Ozawa: "Quick cooling of Kuju volcano, central Kyushu, Japan after the 1995 phreatic eruption"Proc. 24^<th> New Zealand Geothermal Workshop 2002. 279-282 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.Nishijima, Y.Fujimitsu, S.Ehara: "Repeated microgravity observations, GPS survey and continuous tilt measurements in Kuju volcano, central Kyushu, Japan"Proc. 24^<th> New Zealand Geothermal Workshop 2002. 159-164 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] R.Itoi, R.Unoki, T.Gotoh, T.Tanaka: "Environmental effects of Volcanic gases on regional rainwater chemistry at Kuju, Japan"Proc. 24^<th> New Zealand Geothermal Workshop 2002. 5-9 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Ehara, Y.Fujimitsu, J.Nishijima: "Monitoring of a volcanic geothermal reservoir through multi-parameter measurements -A case study of the central part of Kuju volcano, Japan-"Proceedings, Twenty-seven Workshop on Geothermal Reservoir Engineering, Stanford University. 379-381 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 江原幸雄, 藤光康宏, 西島 潤, 福岡晃一郎, 小澤正幸: "水蒸気爆発後の火山体の急速な冷却-1995年九重火山噴火の例-"月刊 地球. 号外39号. 174-178 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 西島 潤, 藤光康宏, 江原幸雄: "九重火山における重力変動観測・GPS測定・傾斜連続観測"月刊 地球. 号外39号. 179-186 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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