Ground Motion Evaluation at Minamidai Residential Area, Tokai Village for the 2011 off the Pacific Coast of Tohoku Earthquake

Abstract

During the 2011 off the Pacific coast of Tohoku Earthquake, Minamidai Residential Area, Tokai Village, Ibaraki Prefecture, Japan, suffered significant damage including a large-scale landslide. In this study, to evaluate ground motions at the damage site, microtremor measurements and temporary aftershock observation were conducted at the site. The evaluated site amplification and phase effects between the damage site and SK-net Tokai site are very similar. It indicates that the observed ground motions at SK-net Tokai site during the 2011 main shock can be regarded as the ground motion at the damage site.