2011年東北地方太平洋沖地震の余震被害調査報告

Abstract

This manuscript reports the structural damage before and after the aftershock on April 7. We conducted four-day aftershock observation at Sanuma, Hasama-cho, Tome city, where roads and houses were subjected to severe damage during the 2011 off the Pacific Coast of Tohoku Earthquake. Using these aftershock records, we evaluated the difference of site amplification effects between Sanuma and nearby seismic stations, and estimated strong motion at Sanuma district during the main shock. The seismic intensity duirng the main shock at Sanuma was estimated as 7 with the JMA intensity scale.