Changes in Groundwater Level and Crustal Strain in and around the Kinki District Related to the 2001 Geiyo Earthquake

Koizumi, Naoji; Kitagawa, Y.; Takahashi, Makoto; Sato, Tsutomu; Matsumoto, Norio; Ito, Hisao; Kuwahara, Yasuto; Cho, Akio; Sato, Takashi

doi:10.4294/zisin1948.55.2_119

Cited by 5 publications

(4 citation statements)

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“…5, which are KNM, OBK1, TNN, TKB3 and KWN-O. Koizumi et al (2002) presented a similar figure as Fig. 5 using data of the 2001 Geiyo earthquake, and discussed the relationship between the observed changes and the theoretical ones.…”

Section: Discussionsupporting

confidence: 63%

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Changes in groundwater level associated with the 2003 Tokachi-oki earthquake

et al. 2014

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Groundwater level and flow rate at 44 wells are continuously observed by the Geological Survey of Japan and the Shizuoka and Gifu Prefectural Governments for monitoring seismic and volcanic activities. The 2003 Tokachi-oki earthquake (M8.0) occurred off the south coast of Hokkaido Island, Japan on September 26, 2003. The epicentral distance to the nearest observation well is about 250 km and that to the farthest is about 1200 km. At the 22 wells, we detected changes in groundwater level or flow rate in relation to the earthquake. Most of the changes are coseismic step-like changes and/or short-period oscillations. In the nearest two observation wells, long-period oscillations with the periods of 39 and 53 minutes were also observed for several days after the earthquake, which is likely due to tsunami. In comparison between distributions of changes in groundwater level and theoretical coseismic strain by the fault model, it is clear that step-like increases were found in the contraction area of the coseismic strain. The relationship between amounts of the observed step-like groundwater-level changes and theoretical ones, calculated by the fault model using strain sensitivities of groundwater level indicates that the groundwater levels in the several wells responded to the coseismic strain.

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Section: Discussionsupporting

confidence: 63%

“…(2002) and Koizumi et al (2002) reported the groundwaterlevel changes and discussed relations between the changes and coseismic strain, respectively. The results show that groundwater-level responses in some wells are consistent with coseismic strain but that those in some wells are not.…”

Section: Introductionmentioning

confidence: 99%

Changes in groundwater level associated with the 2003 Tokachi-oki earthquake

et al. 2014

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“…3). This suggests that the changes in groundwater levels are qualitatively consistent with those of the volumetric strain (Koizumi et al 2002).…”

Section: Observation Sites Data and Methodssupporting

confidence: 65%

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

Shibata

Takahashi

et al. 2020

Earth Planets Space

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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 M 2 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 M 2 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.

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“…At KNG2, TYH1, and HTS, several previous postseismic changes in groundwater levels were mainly the same as the postseismic changes associated with the Sumatra earthquake (Tsukuda, 2000;Koizumi et al, 2002;Sato et al, 2005). In the case of the M7.1 and M7.4 off Kii peninsula earthquakes that occurred within 5 hours on September 5, 2004, postseismic groundwater level Table 3.…”

Section: Discussionmentioning

confidence: 80%

Changes in groundwater levels or pressures associated with the 2004 earthquake off the west coast of northern Sumatra (M9.0)

et al. 2006

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Associated with the 2004 earthquake off the west coast of northern Sumatra, changes in groundwater levels or pressures were observed at many observation stations in Japan which are more than 5000 km from the hypocenter. At 38 of the 45 observation stations, there were changes in groundwater levels or pressures. At the 10 observation stations in which the Ishii-type borehole strain instruments were established, changes in crustal strains were also observed. A major part of the changes in crustal strains and groundwater levels or pressures were dynamic oscillations due to a seismic wave. At some stations, coseismic or postseismic rises or drops were also observed. At five stations where both crustal stain and groundwater levels or pressures were observed, postseismic changes in groundwater levels or pressures were consistent with coseismic static steps in crustal strains. At the other five stations, postseismic changes in groundwater levels or pressures did not agree with the coseismic static steps. At two stations of these five stations, it is anticipated that the pore water pressure change in each aquifer locally occurred independently of the change in crustal strain. At another station, postseismic changes in groundwater level possessed the same characteristics as a model removing the temporary deposition. At the last two stations, the causes of the changes are unknown.

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Changes in Groundwater Level and Crustal Strain in and around the Kinki District Related to the 2001 Geiyo Earthquake

Cited by 5 publications

References 0 publications

Changes in groundwater level associated with the 2003 Tokachi-oki earthquake

Changes in groundwater level associated with the 2003 Tokachi-oki earthquake

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

Changes in groundwater levels or pressures associated with the 2004 earthquake off the west coast of northern Sumatra (M9.0)

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