Groundwater-level Changes Due to Pressure Gradient Induced by Nearby Earthquakes off Izu Peninsula, 1997 |
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| Authors: | Masao Ohno Tsutomu Sato Kenji Notsu Hiroshi Wakita Kunio Ozawa |
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| Institution: | (1) Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan;(2) Geological Survey of Japan, AIST, Tsukuba 305-8567, Japan;(3) Shizuoka Prefecture Office, Shizuoka 420-8601, Japan;(4) Graduate School of Social and Cultural Studies, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan;(5) Present address: Gakushuin Women's College, |
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| Abstract: | Anomalous water level changes were observed at two wells associated with seismic swarm activity off Izu Peninsula on March,
1997. These are coseismic water level drops followed by gradual postseismic water level rise at the time of large earthquakes
during the swarm activity. The post-seismic water level rises, which can be fitted by an exponential function with a time
constant of about six hours, are explained in terms of the horizontal pressure diffusion due to the pressure gradient in the
aquifer induced by the coseismic static strain. |
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| Keywords: | Groundwater water level earthquake strain |
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