Abstract
In the period between March and August in 1997, earthquakes occurred in swarms with their epicenters near Sendai City, Kagoshima Prefecture. Motions of seismic intensity between slightly larger than 5 and a little smaller than 6 were frequently recorded in the Kushikino storage plant. During the earthquakes, invaluable data on hydraulic behavior in rock were obtained continuously.
In this study, behavior of the dynamic pore pressures measured during the earthquakes is studied by checking the rock conditions at measurement points, seismic behavior of the groundwater system in the storage area is considered, and knowledge about hydraulic behavior in rock obtained during the earthquakes is presented.
