Changes in Groundwater Level and Crustal Strain in and around the Kinki District Related to the Western Tottori Earthquake in 2000

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

doi:10.4294/zisin1948.55.1_75

Cited by 2 publications

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“…In the following discussion we did not con- sider the results at the groundwater stations where there were no or only one coseismic change related to those earthquakes. We also focused our attention on those groundwater level changes at the observation stations where estimated coseismic volumetric strain changes were smaller Geiyo Earthquake (Koizumi et al, 2002). Contours denote the coseismic volumetric strain changes calculated from the fault model of the Geographical Survey Institute (2001).…”

Section: Discussionmentioning

confidence: 99%

“…Using this model, we calculated the coseismic volumetric strain change at each station using the program of Okada (1992 (Geographical Survey Institute, 2001; Koizumi et al, 2002) and the Western Tottori Earthquake in 2000 (Geographical Survey Institute, 2000;Takahashi et al, 2002). The results of these analyses were compared with those of the Noto Hanto Earthquake.…”

Section: Observation and Methodsmentioning

confidence: 99%

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Groundwater level changes related to the ground shaking of the Noto Hanto Earthquake in 2007

et al. 2008

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The Geological Survey of Japan, AIST has been monitoring groundwater using the observation network of about 40 stations in and around the Kinki and Tokai districts for earthquake prediction research. The Noto Hanto Earthquake in 2007 (M JMA 6.9) occurred in the northwestern part of the Noto Hanto Peninsula, Japan on March 25, 2007. The epicentral distance to the nearest and furthest observation well is about 100 km and 400 km, respectively. Changes in groundwater level related to the Noto Hanto Earthquake were detected at many stations. Most of these were changes in the long-term trend and/or short-term oscillation; there were a few steplike changes. The coseismic static volumetric strain changes calculated from the fault model ranged between 10 −9 and 10 −10 at most of the observation stations. These changes were therefore considered to be groundwater changes caused by the ground shaking because groundwater level sensitivity to crustal volumetric strain is a few centimeters to 10 −8 strain at the most. We compared the coseismic groundwater level changes for the Noto Hanto Earthquake with those for five recent large earthquakes and obtained rough characteristics of the effect of the ground shaking on the groundwater level at each of the observation stations.

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Section: Discussionmentioning

confidence: 99%

Section: Observation and Methodsmentioning

confidence: 99%

Groundwater level changes related to the ground shaking of the Noto Hanto Earthquake in 2007

et al. 2008

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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 Western Tottori Earthquake in 2000

Cited by 2 publications

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Groundwater level changes related to the ground shaking of the Noto Hanto Earthquake in 2007

Groundwater level changes related to the ground shaking of the Noto Hanto Earthquake in 2007

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

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