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タイトル: Groundwater helium anomaly reflects strain change during the 2016 Kumamoto earthquake in Southwest Japan
著者: Sano, Yuji
Takahata, Naoto
Kagoshima, Takanori
Shibata, Tomo
Onoue, Tetsuji
Zhao, Dapeng
キーワード: Geochemistry
Hydrogeology
Seismology
発行日: 2016年11月29日
出版者: Nature Publishing Group
掲載誌情報: Yuji Sano, Naoto Takahata, Takanori Kagoshima, Tomo Shibata, Tetsuji Onoue & Dapeng Zhao, "Groundwater helium anomaly reflects strain change during the 2016 Kumamoto earthquake in Southwest Japan", Scientific Reports Online Edition: 2016/11/29 (Japan time), doi:10.1038/srep37939.
関連URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/groundwater-helium-level-could-signal-potential-risk-of-earthquake.html
http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/groundwater-helium-level-could-signal-potential-risk-of-earthquake.html
https://dx.doi.org/10.1038/srep37939
抄録: Geochemical monitoring of groundwater and soil gas emission pointed out precursor and/or coseismic anomalies of noble gases associated with earthquakes, but there was lack of plausible physico-chemical basis. A laboratory experiment of rock fracturing and noble gas emission was conducted, but there is no quantitative connection between the laboratory results and observation in field. We report here deep groundwater helium anomalies related to the 2016 Kumamoto earthquake, which is an inland crustal earthquake with a strike-slip fault and a shallow hypocenter (10 km depth) close to highly populated areas in Southwest Japan. The observed helium isotope changes, soon after the earthquake, are quantitatively coupled with volumetric strain changes estimated from a fault model, which can be explained by experimental studies of helium degassing during compressional loading of rock samples. Groundwater helium is considered as an effective strain gauge. This suggests the first quantitative linkage between geochemical and seismological observations and may open the possibility to develop a new monitoring system to detect a possible strain change prior to a hazardous earthquake in regions where conventional borehole strain meter is not available.
内容記述: UTokyo Research掲載「地下水のヘリウム量は大地震の前触れを告げる指標になりうるか」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/groundwater-helium-level-could-signal-potential-risk-of-earthquake.html
UTokyo Research "Groundwater helium level could signal potential risk of earthquake" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/groundwater-helium-level-could-signal-potential-risk-of-earthquake.html
URI: http://hdl.handle.net/2261/61238
ISSN: 2045-2322
出現カテゴリ:014 自然科学
1392010 学術雑誌論文

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