Hydrological responses induced by the Tokachi‐oki earthquake in 2003 at hot spring wells in Hokkaido, Japan

Akita, Fujio

doi:10.1029/2004gl020433

Cited by 41 publications

(22 citation statements)

References 15 publications

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“…Abrupt changes in well water levels in the nearfield (within 1-2 fault lengths) are often explained by the static poroelastic strain of aquifers caused by earthquakes (Akita and Matsumoto, 2004;Matsumoto and Roeloffs, 2003;Roeloffs and Bredehoeft, 1985;Shi et al, 2012;Shibata et al, 2010;Wakita, 1975;Wang and Chia, 2008;Zhang and Huang, 2011). In the intermediate and farfield (many fault lengths), the static poroelastic strains from displacement during earthquakes are small and can fail to explain the sign of the sustained variations in water levels .…”

Section: Introductionmentioning

confidence: 99%

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Lai

Xue

et al. 2014

Tectonophysics

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An important dataset to emerge from the Wenchuan earthquake Fault Scientific Drilling project is direct measurement of the permeability evolution of a fault zone. In order to provide context for this new observation, we examined the evolution of tidal responses in the nearfield region (within~1.5 fault lengths) at the time of the mainshock. Previous work has shown that seismic waves can increase permeability in the farfield, but their effects in the nearfield are more difficult to discern. Close to an earthquake, hydrogeological responses are generally a combination of static and dynamic stresses. In this work, we examine the well water level data in the region of the large M w 7.9 Wenchuan earthquake and use the phase shift of tidal responses as a proxy for the permeability variations over time. We then compare the results with the coseismic water level pattern in order to separate out the dynamic and static effects. The coseismic water level pattern for observed steps coincident with the Wenchuan mainshock mainly tracks the expected static stress field. However, most of the wells that have resolvable tidal responses show permeability enhancement after this large earthquake regardless of whether the coseismic response for the well water level is increasing or decreasing, indicating permeability enhancement is a distinct process from static poroelastic strain.

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Section: Introductionmentioning

confidence: 99%

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Lai

Xue

et al. 2014

Tectonophysics

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“…The tidal effects in the well water level are primarily the responses to the volumetric strain of the aquifer in the subsurface, which are usually not subjected to interference by rainfall, discharge and other factors. Therefore, to some extent, we can study tide anomalies from well level observations prior to earthquakes without the influence of these sources of noise (Akita and Matsumoto, 2004;Li and Jiao, 2001;Riedel et al, 2010;Taniguchi, 2002).…”

Section: Introductionmentioning

confidence: 99%

Tide-factor anomalies from observations of well level in the Sichuan Province prior to the great Wenchuan earthquake of 2008

Liu

Wang

Shi

et al. 2013

Journal of Geodynamics

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“…Quantitative evaluations of the relationship between the groundwater level and crustal static strain changes associated with earthquakes have been performed in recent years (Igarashi and Wakita, 1991;Quilty and Roeloffs, 1997;Koizumi et al, 2004). Akita and Matsumoto (2004) investigated coseismic groundwater level changes in a great many observation wells in Hokkaido, Japan induced by five earthquakes with M > 7.5 that occurred around the Hokkaido region. These researchers showed that groundwater level changes could generally be explained by coseismic static volumetric strain changes.…”

Section: Introductionmentioning

confidence: 99%

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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Hydrological responses induced by the Tokachi‐oki earthquake in 2003 at hot spring wells in Hokkaido, Japan

Cited by 41 publications

References 15 publications

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Tidal response variation and recovery following the Wenchuan earthquake from water level data of multiple wells in the nearfield

Tide-factor anomalies from observations of well level in the Sichuan Province prior to the great Wenchuan earthquake of 2008

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

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