STRONG MOTION ESTIMATION AT RESIDENTIAL AREA IN TATE NEW TOWN, ICHINOSEKI CITY FOR THE 2008 IWATE-MIYAGI INLAND EARTHQUAKE AND THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE BASED ON THE EMPIRICAL SITE AMPLIFICATION AND PHASE EFFECTS

Abstract

 In Tate New Town, a residential area in Ichinoseki City, fill slope was damaged by the 2011 off the Pacific coast of Tohoku Earthquake (M_W9.0), while it was not damaged by the 2008 Iwate-Miyagi Inland Earthquake (M_J7.2). To better understand the mechanism of the damage, it is necessary to have a better understanding on the seismic response of the fill slope during not only the 2011 event but also the 2008 event with high accuracy by taking into account site effects. In this study, we evaluated the seismic waveforms in the residential area based on moderate earthquake observation records. Furthermore, based on the estimated waveforms, we discussed the threshold ground motion which influences the seismic damages of the residential fill slope. The estimated waveforms and related discussion will be useful in future study of seismic performance of fill slope.