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Physical state of hydrothermal system to understand the mechanism of phreatic eruption

Research Project

Project/Area Number 19K21058
Project/Area Number (Other) 18H05877 (2018)
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund (2019)
Single-year Grants (2018)
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Seki Kaori  国立研究開発法人産業技術総合研究所, 地質調査総合センター, 研究員 (90828047)

Project Period (FY) 2018-08-24 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords水蒸気噴火 / 熱水系 / 火山ガス / 温泉水 / 箱根大涌谷 / 立山地獄谷 / 噴気 / 温泉 / シミュレーション / 水蒸気爆発
Outline of Research at the Start

水蒸気噴火の噴出物は、浅部熱水系で変質を受けた熱水変質鉱物を多く含むことから、水蒸気噴火の発生場は、火山体浅部に存在する熱水系であると考えられている。水蒸気噴火は、一般的にマグマ噴火に比べ規模が小さく、前駆現象の観測が難しいことから、噴火の予知には至っていない。浅部熱水系に起因した水蒸気噴火が発生しうる、または発生した火山である、立山地獄谷と箱根大涌谷を対象に、噴気および温泉水の化学・同位体比組成を調査し、得られた結果を基として、熱水流動のシミュレーションを行い、火山活動を正確に評価しうる指標を提案する。

Outline of Final Research Achievements

Phreatic eruption is one of the volcanic eruption style. Although phreatic eruption often occur in the world, the mechanism of phreatic eruption is not clear because of the small scale. In this study, I measured chemical and isotopic composition of hot-springs and fumarolic gases sampled at Owakudani in Hakone Volcano and Jigokudani Valley in Tateyama Volcano that have the potential of the phreatic eruptions. The temperature of the hydrothermal system beneath Owakudani was estimated to be less than 260 degrees. The temporary change of the chemical composition of the fumarolic gases were observed, which was estimated to be associated to the increased volcanic activity. Some fumarolic gases in the Jigokudani Valley was affected by isotopic fractionation at temperature of 100 degrees, and the others are separated from magmatic water and meteoric water at higher temperature. The hot-springs are classified into three types by the ratio of Cl and SO4.

Academic Significance and Societal Importance of the Research Achievements

水蒸気噴火は,国内でも数多く発生し,噴火頻度そのものは多いにも拘らず,その噴火規模が小さいため,発生機構は明らかになっていない.水蒸気噴火が発生しうる火山は,観光地となっている場合が多く,小規模な噴火であっても,深刻な自然災害となりうる.本研究では,水蒸気噴火が発生しうる火山において,火山ガスおよび温泉水の採取を行い,水蒸気噴火の発生場として考えられている,熱水系の構造を明らかにし,火山活動の評価を行ってきた.

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • Research Products

    (4 results)

All 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Variations in thermal state revealed by the geochemistry of fumarolic gases and hot-spring waters of the Tateyama volcanic hydrothermal system, Japan2019

    • Author(s)
      Seki Kaori、Ohba Takeshi、Aoyama Shinnosuke、Ueno Yuichiro、Sumino Hirochika、Kanda Wataru、Yaguchi Muga、Tanbo Toshiya
    • Journal Title

      Bulletin of Volcanology

      Volume: 81 Issue: 2 Pages: 8-8

    • DOI

      10.1007/s00445-018-1264-7

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Hydrothermal system beneath Owakudani, Hakone Volcano, inferred from 3D resistivity structure and composition of fumarolic gases2019

    • Author(s)
      Seki, K., Kanda, W., Mannen, K., Shinohara, H., Takakura, S., Koyama, T., Noguchi, R., Ishikawa, M., Fukai, M., Yukutake, Y., Harada, M., Abe, Y.
    • Organizer
      International Union of Geodesy and Geophysics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The chemical and isotopic changes of the hot springs and fumaroles in the Jigokudani Valley, Tateyama Volcano, Japan2019

    • Author(s)
      Seki, K., Ohba, T., Aoyama, S., Ueno, Y., Sumino, H., Kanda, W., Shinohara, H., Toyama, K.,The chemical and isotopic changes of the hot springs and fumaroles in the Jigokudani Valley, Tateyama Volcano, Japan Yaguchi, M., Tanbo, T.
    • Organizer
      IAVCEI Commission on Volcanic Lakes 10 Workshop
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Hydrothermal system beneath Owakudani, Hakone Volcano, inferred from 3D resistivity structure and composition of fumarolic gases2019

    • Author(s)
      Seki, K., Kanda, W., Mannen, K., Shinohara, H., Takakura, S., Koyama, T., Noguchi, R., Ishikawa, M., Fukai, M., Yukutake, Y., Harada, M., Abe, Y.
    • Organizer
      27th IUGG General Assembly
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

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Published: 2018-08-27   Modified: 2024-03-26  

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