A study on dependence of long-period ground motions in Chukyo area on source locations based on observation and finite difference analysis

Abstract

This study clarify that the sedimentary basin on the seismic wave path affects the long-period seismic wave, based on the ground motion observation and the finite difference analysis. Seismic ground motion in Chukyo area shows long-period seismic wave propagation for an earthquake around the Niigata sedimentary basin. The same phenomena are simulated by the numerical analysis using the 3D finite difference method. Particularly an earthquake beneath the Niigata sedimentary basin generates long-period seismic wave. In addition, the sedimentary basin on the seismic wave path causes an increase of the amplitude and extension of the duration time, according to the result of the 3D finite difference analysis based on the reciprocity theorem of Green's function. These effects are different due to the shape and the size of the sedimentary basin and the seismic wave paths.