STRONG MOTION ESTIMATION FOR THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE BASED ON THE AFTERSHOCK OBSERVATION RECORDED AT SANUMA DISTRICT

Abstract

 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.