SIMULATION ANALYSIS OF LONG PERIOD GROUND MOTIONS IN COASTAL AREA OF ISE BAY DURING THE 2011 TOHOKU EARTHQUAKE AND AMPLIFICATION CHARACTERISTICS DEPENDING ON AZIMUTHAL ANGLES OF S-WAVE INCIDENCE

Abstract

During the 2011 Tohoku earthquake, long period ground motions were largely amplified in coastal area of Ise Bay. This report describes the 3-D wave propagation analyses results for the 3-D geological model including sedimentary basin of Nobi Plain by using the 3-D finite defference method. The records are well simulated and the long period ground motions are amplified in the coastal area mainly due to constructive interference of multi-passing waves. We also investigate amplification characteristics for various azimuthal angles of the incident S-wave, showing complexed spatial variation of local amplification.