Continuous Observation of Groundwater and Crustal Deformation for Forecasting Tonankai and Nankai Earthquakes in Japan |
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| Authors: | Satoshi Itaba Naoji Koizumi Norio Matsumoto Ryu Ohtani |
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| Institution: | 1. National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan, Active Fault and Earthquake Research Center, Site C-7, 1-1-1, Tsukuba, Ibaraki, 305-8567, Japan
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| Abstract: | In 2006, we started construction of an observation network of 12 stations in and around Shikoku and the Kii Peninsula to conduct research for forecasting Tonankai and Nankai earthquakes. The purpose of the network is to clarify the mechanism of past preseismic groundwater changes and crustal deformation related to Tonankai and Nankai earthquakes. Construction of the network of 12 stations was completed in January 2009. Work on two stations, Hongu-Mikoshi (HGM) and Ichiura (ICU), was finished earlier and they began observations in 2007. These two stations detected strain changes caused by the slow-slip events on the plate boundary in June 2008, although related changes in groundwater levels were not clearly recognized. |
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