Evaluation of phreatic eruption potential by the precise imaging of subsurface structure and the detection of ground deformation
Project/Area Number |
25350494
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Natural disaster / Disaster prevention science
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Research Institution | Tokyo Institute of Technology |
Principal Investigator |
Kanda Wataru 東京工業大学, 火山流体研究センター, 准教授 (00301755)
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Co-Investigator(Kenkyū-buntansha) |
OGAWA YASUO 東京工業大学, 火山流体研究センター, 教授 (10334525)
TANBO TOSHIYA 公益財団法人立山カルデラ砂防博物館, 学芸課, 主任学芸員 (10574311)
KOBAYASHI TOMOKADU 国土地理院(地理地殻活動研究センター), 地理地殻活動研究室, 主任研究官 (40447991)
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Project Period (FY) |
2013-04-01 – 2016-03-31
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Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
|
Keywords | 火山災害 / 水蒸気爆発 / 比抵抗構造 / 地盤変動 / 熱水流体 |
Outline of Final Research Achievements |
We conducted the resistivity surveys, the ground deformation analysis of InSAR images, the thermal observation, and the geochemical analysis of hot-spring waters in the Jigokudani valley of Tateyama volcano, where phreatic eruptions repeatedly occurred in the past and the volcanic activity has been increasing. These analyses revealed a typical cap structure consisting of near-surface cap rock overlying a gas reservoir, which has been detected in many volcanoes known to undergo repeated phreatic eruptions. We confirmed that the shallow subsurface of the Jigokudani Valley is in the pressurized and high-temperature state. In addition, we clarified that all hot springs are formed by the mixing of magmatic fluid and local meteoric water and have a common parent fluid that differentiates into three types in the shallow hydrothermal system. From these findings, we consider that the shallow ground of Jigokudani Valley is satisfying the requirements for causing a phreatic eruption.
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Report
(4 results)
Research Products
(21 results)
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[Journal Article] Imaging the hydrothermal system beneath the Jigokudani valley, Tateyama volcano, Japan: implications for structures controlling repeated phreatic eruptions from an audio-frequency magnetotelluric survey2015
Author(s)
Seki, K., Kanda, W., Ogawa, Y., Tanbo, T., Kobayashi, T., Hino, Y., Hase, H.
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Journal Title
Earth Planets and Space
Volume: 67:6
Issue: 1
Pages: 1-9
DOI
NAID
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Presentation] Hydrothermal system beneath the Jigokudani valley, Japan2016
Author(s)
Seki, K., Kanda, W., Ohba, T., Tanbo, T., Nogami, K., Aoyama, S.
Organizer
Goldschmidt2016
Place of Presentation
横浜市
Year and Date
2016-07-01
Related Report
Int'l Joint Research
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[Presentation] 立山地獄谷の熱水系2016
Author(s)
関 香織, 神田 径, 丹保 俊哉, 大場 武, 小川 康雄, 高倉 伸一, 潮田 雅司, 鈴木 惇史, 齋藤 全史郎, 松永 康生
Organizer
日本地球惑星連合2016年大会
Place of Presentation
千葉市
Year and Date
2016-05-23
Related Report
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[Presentation] 立山地獄谷の熱水系2015
Author(s)
関 香織, 神田 径, 丹保 俊哉, 小川 康雄, 高倉 伸一, 潮田 雅司, 鈴木 惇史, 齋藤 全史郎, 松永 康生
Organizer
日本火山学会2015年秋季大会
Place of Presentation
富山市
Year and Date
2015-09-29
Related Report
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[Presentation] Hydrothermal system beneath the Jigokudani valley, Tateyama volcano, Japan, inferred from AMT surveys and hot spring water chemistry2015
Author(s)
Seki, K., Kanda, W., Tanbo, T., Ogawa, Y., Takakura, S., Ushioda, M., Suzuki, A., Saito, Z., Matsunaga, Y.
Organizer
26th IUGG General Assembly
Place of Presentation
プラハ(チェコ共和国)
Year and Date
2015-06-29
Related Report
Int'l Joint Research
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[Presentation] Hydrothermal system beneath the Jigokudani valley, Tateyama volcano, Japan, inferred from AMT surveys and hot spring water chemistry2015
Author(s)
Seki, K., Kanda, W., Tanbo, T., Ogawa, Y., Takakura, S., Ushioda, M., Suzuki, A., Saito, Z., Matsunaga, Y.
Organizer
26th IUGG General Assembly 2015
Place of Presentation
Prague Congress Centre (Czech Republic)
Year and Date
2015-06-28
Related Report
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[Presentation] Resistivity structure around the Jigokudani valley, Tateyama volcano, Japan, inferred from audio-frequency magnetotellurics2014
Author(s)
Seki, K., Kanda, W., Ogawa, Y., Hase, H., Hino, Y., Kobayashi, T., Tanbo, T.
Organizer
Geofluid-3 Symposium
Place of Presentation
東京工業大学
Related Report
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