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Study of Geothermal Structure and Processes of Hydrothermal Fluid Flow in the Central Kyushu, Japan

Research Project

Project/Area Number 08454132
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

YUSA Yuki  Kyoto University, Graduate School of SCIENCE, Professor, 理学研究科, 教授 (90025403)

Co-Investigator(Kenkyū-buntansha) TAKEMURA Keiji  Kyoto University, Graduate School of SCIENCE, Associate Professor, 理学研究科, 助教授 (00201608)
TANAKA Yoshikazu  Kyoto University, Graduate School of SCIENCE, Associate Professor, 理学研究科, 助教授 (00025420)
KITAOKA Koichi  Kyoto University, Graduate School of SCIENCE, Associate Professor, 理学研究科, 助教授 (30093230)
OHSAWA Shinji  Kyoto University, Graduate School of SCIENCE, Associate Professor, 理学研究科, 助教授 (30243009)
FUKUDA Yoichi  Kyoto University, Graduate School of SCIENCE, Associate Professor, 理学研究科, 助教授 (30133854)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1998: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsUndergoing structure / Tectonics / Origin of materials in hydrothermal system / Circulation of geothermal fluid / Evolution of hydrothermal system / Volcanic / Geothermal gases / self-potential / Central Kyushu, Japan / 地熱系の年齢 / 塩素収支 / 窒素の由来 / 赤色沈澱物 / 火山放出ガス量の測定 / 地溝の形成 / トリチウム濃度 / 火山噴出物量の測定法 / 深部熱水の由来
Research Abstract

1. Development of the underground structure in the central Kyushu is as follows :
(1) Before 1.5 million years, the half-graben was formed along the Median Tectonic Line (MTL) by the North-South extension. (2) Between 1.5 and 0.7 million years, the basic pull-apart basin was formed by a right lateral slip of two fault lines. (3) Since then, the basin structure has changed to be the present state following the reduction of the active zone of MTL.
2. Volcanic gases in the central Kyushu and the Ogasawara-Iwojima contain less nitrogen than those in the North-East Japan and the southern Kyushu. This indicates that the nitrogen in magmatic gases is originated from the nitrogen compounds in pre-Tertiary basement rocks.
3. The age of the Beppu hydrothermal system is estimated to be about 50 thousand years based on geochemical and hydrological data. More than 90% of chlorine discharged during this period are brought from the deep.
4. Circulation and flow of fluids in the Kuju-Iwoyama Volcano are characterized as follows :
(1) The deep circulation of geothermal fluid is driven by magmatic heat, and the average residence times of meteoric waters are short for the vapor system (about 7 years) and long for the liquid system (over 100 years). (2) Amounts of chlorine and magmatic water discharged during calm period are 3.7-8.7 and 360-1400 ton/day respectively. (3) When the volcanic activity increases, the atmospheric air is entrained into the volcanic system through the subsurface formation.
5. Self-potential measurements were conducted in Mt. Garan (Beppu) and in the central cone of Mt. Aso, and anomalies of electric potential suggesting flow paths of geothermal fluids were detected.
6. A temperature decline in the Beppu hydrothermal system during the last hundred years has been suggested by the change in compositions of red sediments in a hot pond.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (44 results)

All Other

All Publications (44 results)

  • [Publications] 大沢信二: "別府血の池地獄の温泉沈殿物の色彩変化"温泉科学. 46. 13-19 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 由佐悠紀: "温泉の起源(塩素の起源に関して)"温泉科学. 46. 105-108 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 竹村恵二: "湖沼・内湾堆積物の年代推定に果たすテフラの役割"月刊地球. 19. 480-484 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 大沢信二: "阿蘇火山地域から放出される噴気ガスの不活性ガス組成"温泉科学. 47. 56-67 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 大沢信二: "九重硫黄山の噴気地から放出される塩化水素・マグマ性水蒸気量の推定"日本地熱学会誌. 19. 73-83 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 北岡豪一: "トリチウムから推定される九重硫黄山における深部水循環"大分県温泉調査研究会報告. 48. 21-29 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 福田洋一: "別府地域の地下水変動と重力調査"大分県温泉調査研究会報告. 48. 31-39 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 田中良和: "九州中部におけるネットワークMT観測"CA研究会1998年論文集. 243-253 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 大沢信二: "岳湯地熱地域(熊本県小国町)の噴気・蒸気井から放出されるガスの化学組成"日本地熱学会誌. 20. 289-292 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 大沢信二: "海洋地域の沈み込み帯から放出される低N_2/He比のマグマ性ガス"温泉科学. 48. 9-14 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinji Ohsawa: "Entrainment of atmospheric air into the volcanic system during the 1995 phreatic eruption of Kuju Volcano,Japan"Journal of Volcanology and Geothermal Research. (印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yuki Yusa: "Age of the Beppu Hydrothermal System,Japan"Proceedings of WGC2000. (印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinji Ohsawa: "Discoloration of hot-spring deposits of the hot pool "Chinoike-Jigoku", in Beppu Geothermal Area, central Kyushu, Japan"J. Balneol. Soc. Japan. 46. 13-19 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yuki Yusa: "Origin of hot spring, with reference to origin of chlorine"J. Balneol. Soc. Japan. 46. 105-108 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Keiji Takemura: "Role of tephra for age determination of lake and bay sediments"Chikyu Monthly. 19. 480-484 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinji Ohsawa: "Inert gas compositions of fumarolic gases discharged from the Aso Volcanic-geothermal region, Japan"J. Balneol. Soc. Japan. 47. 56-67 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinji Ohsawa: "Estmation of HCI and magmatic steam fluxes from the fumarole area at Kuju-Iwoyama Volcano, central Kyushu, Japan"J. Geotherm. Res. Soc. Japan. 19. 73-83 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Koichi Kitaoka: "Deep circulation of water inferred from tritium in the Kuju-Iwoyama"Rep of Oita Hot spring Res. Soc.. 48. 21-29 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoichi Fukuda: "Groundwater variations in the Beppu Area and gravity measurements"Rep of Oita Hot Spring Res. Soc.. 48. 31-39 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoshikazu Tanaka: "Network MT measurements in the central Kyushu"1998 Bulletin CA Res. Soc.. 243-253 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinji Ohsawa: "Chemical compositions of gases discharged from fumaroles and steam wells in the Takenoyu Geothermal Area"J. Geotherm. Res. Soc. Japan. 20. 289-292 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinji Ohsawa: "Low NィイD22ィエD2/He ratio magmatic gas discharged from Ogasawara-Iwojima in Izu-Mariana Arc along an oceanic subduction zone between Pacific and Philippine-Sea plates"J. Balneol. Soc. Japan. 48. 9-14 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinji Ohsawa: "Entrainment of atmospheric air into the volcanic system during the 1995 phreatic eruption of Kuju Volcano, Japan"J. Volcanol. Geotherm. Res.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yuki Yusa: "Age of the Beppu Hydrothermal System, Japan"Proc. WGC2000. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 由佐悠紀: "温泉の起源(塩素の起源に関して)" 温泉科学. 46・3. 105-108 (1996)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大沢信二: "九重硫黄山の噴気地から放出される塩化水素・マグマ性水蒸気量の推定" 日本地熱学会誌. 19・2. 73-83 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Kusumoto: "Interpretation of gravity low in and around Beppu Bay, Kyushu, Japan" International Association of Geodesy Symposia. 117. 320-327 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 楠本成寿: "重力異常からみた九州中部地域東部の第四紀テクトニクス" 地学雑誌. 106. 635-643 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大沢信二: "阿蘇火山地域から放出される噴気ガスの不活性ガス組成" 温泉科学. 47・2. 56-67 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Kitaoka: "Changes in Chemical and isotopic compositions of deep geothermal waters through subsurface boiling at Kuju-Iwoyama Volcano, Central Kyushu, Japan" Proceedings of the 33rd Conference of SITH. 216-219 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大上和敏: "別府血の池地獄の色彩変化に関わる沈澱物の鉱物組成・温泉水の化学組成の変化" 温泉科学. 47・4. 157-165 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Itoh: "History of basin formation and tectonic evolution at the termination of a large transcurrent fault system: deformation mode of central Kyushu, Japan" Tectonophysics. 284. 135-150 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大沢信二: "海洋地域の沈み込み帯から放出される低N_2/He比のマグマ性ガス-伊豆マリアナ弧の小笠原硫黄島について-" 温泉科学. 48・1. 9-14 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Kusumoto: "Restoration of the depression structure at the eastern part of central Kyushu, Japan by means of dislocation modeling" Tectonophysics. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大沢 信二: "九重硫黄山の噴気地域から放出される塩化水素・マグマ性水蒸気量の推定" 日本地熱学会誌. 19・2. 73-83 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Shigekazu Kusumoto: "Interpretation of gravity low in and around Beppu Bay,Kyushy,Japan" International Association of Gecdesy Symposia. 117. 320-327 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大沢 信二: "阿蘇火山地域から放出される噴気ガスの不活性ガス組成" 温泉科学. 47・2. 56-67 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Koichi Kitaoka: "Changes in chemical and isotopic compositions of deep geothermal waters through subsurface boiling at Kuju-Iwotama Volcano,Central Kyusyu,Japan" Proceedings of the 33rd Conference of SITH. 216-219 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大上 和敏: "別府血の池地獄の色彩変化に関わる沈澱物の鉱物組成・温泉水の化学組成の変化" 温泉科学. 47・4. 159-167 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大沢 信二: "海洋地域の沈み込み帯から放出される低N_2/He比のマグマ性ガス〜伊豆マリアナ号弧の小笠原硫黄島について〜" 温泉科学. 48・印刷中. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 由佐悠紀: "温泉の起源(塩素の起源に関して)" 温泉科学. 46・3. 105-108 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 北岡豪一: "九重硫黄山における噴気と温泉水のトリチウム濃度" 大分県温泉調査研究会報告. 47. 21-28 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大沢信二: "大分平野の温泉水の起源について" 大分県温泉調査研究会報告. 47. 37-42 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大沢信二: "九重硫黄山の噴気地帯から放出される塩化水素・マグマ性水蒸気量の推定" 日本地熱学会誌. 19(印刷中). (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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