Detection of Groundwater Level Changes Related to Earthquakes
An earthquake is a waveform representing catastrophic release of strain energy that was gradually accumulated in the crust. Crustal strain is considered to be changed by some causes immediately before the huge destruction, and leveling, tilt, volumetric strain, groundwater level and radon concentration in groundwater are continuously observed with an aim of detecting precursory changes mainly in the South Kanto and the Tokai districts. The most famous example of crustal deformation preceding a large earthquake is the change of level in Kakegawa, Shizuoka Prefecture before the 1944 To-Nankai Earthquake (M7.9; Mogi, 1985).
KeywordsPermeability Covariance Radon Geophysics
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