Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

Tomo Shibata; Ryo Takahashi; Hiroaki Takahashi; Takanori Kagoshima; Naoto Takahata; Yuji Sano; Daniele L. Pinti

doi:10.1186/s40623-020-01152-y

Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

Tomo Shibata^*, Ryo Takahashi, Hiroaki Takahashi, Takanori Kagoshima, Naoto Takahata, Yuji Sano, Daniele L. Pinti

^*Corresponding author for this work

Department of Natural and Environmental Science

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthquake were detected in three of the six wells, even though they are located hundreds of kilometers from the epicenter. The groundwater level changes are qualitatively consistent with the volumetric strain induced by the earthquake. We analyzed groundwater level responses to the M₂ tidal constituent before and after the earthquake, but related changes in amplitude and phase shifts remained within the usual variation. Observed coseismic change was explained by the response to the M₂ tidal constituent component and the calculated volumetric strain for one of the wells, where groundwater level decreased. The observed change in the other two was found to be much greater than the corresponding estimates of the volumetric strain.

Original language	English
Article number	23
Journal	Earth, Planets and Space
Volume	72
Issue number	1
DOIs	https://doi.org/10.1186/s40623-020-01152-y
State	Published - 2020/12/01

Keywords

2018 Hokkaido Eastern Iburi earthquake
Coseismic change
Groundwater level
Tidal response

ASJC Scopus subject areas

Geology
Space and Planetary Science

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10.1186/s40623-020-01152-y

Cite this

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title = "Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake",

abstract = "Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthquake were detected in three of the six wells, even though they are located hundreds of kilometers from the epicenter. The groundwater level changes are qualitatively consistent with the volumetric strain induced by the earthquake. We analyzed groundwater level responses to the M2 tidal constituent before and after the earthquake, but related changes in amplitude and phase shifts remained within the usual variation. Observed coseismic change was explained by the response to the M2 tidal constituent component and the calculated volumetric strain for one of the wells, where groundwater level decreased. The observed change in the other two was found to be much greater than the corresponding estimates of the volumetric strain.",

keywords = "2018 Hokkaido Eastern Iburi earthquake, Coseismic change, Groundwater level, Tidal response",

author = "Tomo Shibata and Ryo Takahashi and Hiroaki Takahashi and Takanori Kagoshima and Naoto Takahata and Yuji Sano and Pinti, {Daniele L.}",

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day = "1",

doi = "10.1186/s40623-020-01152-y",

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T1 - Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

AU - Shibata, Tomo

AU - Takahashi, Ryo

AU - Takahashi, Hiroaki

AU - Kagoshima, Takanori

AU - Takahata, Naoto

AU - Sano, Yuji

AU - Pinti, Daniele L.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthquake were detected in three of the six wells, even though they are located hundreds of kilometers from the epicenter. The groundwater level changes are qualitatively consistent with the volumetric strain induced by the earthquake. We analyzed groundwater level responses to the M2 tidal constituent before and after the earthquake, but related changes in amplitude and phase shifts remained within the usual variation. Observed coseismic change was explained by the response to the M2 tidal constituent component and the calculated volumetric strain for one of the wells, where groundwater level decreased. The observed change in the other two was found to be much greater than the corresponding estimates of the volumetric strain.

AB - Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthquake were detected in three of the six wells, even though they are located hundreds of kilometers from the epicenter. The groundwater level changes are qualitatively consistent with the volumetric strain induced by the earthquake. We analyzed groundwater level responses to the M2 tidal constituent before and after the earthquake, but related changes in amplitude and phase shifts remained within the usual variation. Observed coseismic change was explained by the response to the M2 tidal constituent component and the calculated volumetric strain for one of the wells, where groundwater level decreased. The observed change in the other two was found to be much greater than the corresponding estimates of the volumetric strain.

KW - 2018 Hokkaido Eastern Iburi earthquake

KW - Coseismic change

KW - Groundwater level

KW - Tidal response

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U2 - 10.1186/s40623-020-01152-y

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Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

Abstract

Keywords

ASJC Scopus subject areas

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