Evaluation of seismic waveforms at the Kamikamato landslide site during the 2011 off the Pacific coast of Tohoku Earthquake and the 2011 Hamadori Fukushima Prefecture Earthquake based on moderate earthquake observation records

Abstract

  In Kamikamato Area, Iwaki City, a landslide was induced by the large scale aftershock (the 2011 Hamadori Fukushima Prefecture Earthquake (2011/04/11;Mj7.0)), while it was not induced by the 2011 off the Pacific coast of Tohoku Earthquake (2011/03/11;Mw9.0). In this study, we evaluated the strong motions at the landslide site based on moderate earthquake observation records. As a result, we found the similarity of site amplification factor between thelandslideareaand strong motion station, namely, “Iwaki-Yumoto IC”. At Iwaki-Yumoto IC site, where the waveforms were not recorded during the large scale aftershock, the waveforms were estimated based on the site-effect substitution method. Moreover, we examined the effect of frequency components of the estimated waveforms on the dynamic landslide based on one-side strength demand spectra.