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Groundwater oxygen anomaly related to the 2016 Kumamoto earthquake in Southwest Japan

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Cited 1 time in scopus
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Title
Groundwater oxygen anomaly related to the 2016 Kumamoto earthquake in Southwest Japan
Other Titles
일본 남서 쿠마모토에서 2016년에 발생한 지진으로 인한 지하수의 산소동위원소 이상 연구
Authors
SANO, Yuji
ONDA, Satoki
KAGOSHIMA, Takanori
MIYAJIMA, Toshihiro
TAKAHATA, Naoto
SHIBATA, Tomo
NAKAGAWA, Chika
ONOUE, Tetsuji
Kim, Nak Kyu
LEE, Hyunwoo
KUSAKABE, Minoru
PINTI, Daniele L.
Subject
Science & Technology
Keywords
groundwater; earthquake precursors; hydrogen isotopes; oxygen isotopes; 2016 Kumamoto earthquake
Issue Date
2020-07
Citation
SANO, Yuji, et al. 2020. "Groundwater oxygen anomaly related to the 2016 Kumamoto earthquake in Southwest Japan". PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES, 96(7): 322-334.
Abstract
Here, we report the groundwater oxygen isotope anomalies caused by the 2016 Kumamoto earthquake (M_JMA 7.3) that occurred in Southwest Japan on April 16, 2016. One hundred and seventeen groundwater samples were collected from a deep well located 3 km to the southeast of the epicenter in Mifune Town, Kumamoto Prefecture; they were drinking water packed in PET bottles and distributed in the area between April 2015 and March 2018. Further, the oxygen and hydrogen isotopes were evaluated via cavity ring-down spectroscopy without performing any pretreatment. An anomalous increase was observed with respect to the δ18O value (up to 0.51‰) soon after the earthquake along with a precursory increase of 0.38‰ in January 2016 before the earthquake. During these periods, there was no noticeable change in the hydrogen isotopic ratios. Rapid crustal deformation related to the earthquake may have enhanced the microfracturing of the aquifer rocks and the production of new surfaces, inducing δ18O enrichment via oxygen isotopic exchange between rock and porewater without changing δ2H.
URI
https://repository.kopri.re.kr/handle/201206/11881
DOI
http://dx.doi.org/10.2183/pjab.96.024
Appears in Collections  
2020-2020, Antarctic geology and meteorite research based on the Jangbogo station: Crustal evolution of Victoria Land and characteristics of asteroidal materials (20-20) / Lee, Mi Jung (PE20200)
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