Aftershock Observation and Ground Motion Evaluation at the Earth Banks in Yamamoto Town Damaged by the 2011 Tohoku Earthquake

Abstract

During the 2011 off the Pacific coast of Tohoku Earthquake, a lot of serious damage occurred to embankments in Yamamoto Town, Miyagi Prefecture, Japan. In this study, to evaluate ground motions at the damage sites, temporary aftershock observation was conducted at the sites. The result indicates that the ground motions at the damage sites were similar to those at either of the strong motions stations, namely, “KiK-net Yamamoto" or “Yamamoto Town Office". At Yamamoto Town Office, where the main shock waveforms were not recorded, the waveforms were estimated based on the extended site-effect substitution method.