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.