ESTIMATION OF SUBSURFACE STRUCTURE FROM MICROTREMOR OBSERVATION AND STRONG GROUND MOTION EVALUATION AT SCHOOL DAMAGE SITES DUE TO THE 1943 TOTTORI EARTHQUAKE

Abstract

 On September 10, 1943, the Tottori earthquake occurred in the east of Tottori prefecture, and generated serious damage in Tottori city. We estimated subsurface velocity structure of damaged school sites in Tottori city using microtremor single station observation and array observation. Then we evaluated strong ground motion of the Tottori earthquake using stochastic green's function method at the sites. We found that predominant periods of response spectrum at heavily damaged sites agree with natural period of wooden building, and that estimated ground motions at damaged sites have large amplitude in period range between 1 to 2 sec, than lighter damage sites.