EVALUATION OF GROUND MOTION AT AKITSU RIVER BRIDGE ALONG KYUSHU EXPRESSWAY DURING THE FORESHOCK OF THE 2016 KUMAMOTO EARTHQUAKE BASED ON TEMPORARY AFTERSHOCK OBSERVATION

Abstract

 Slope failure of expressway embankment was occurred in the abutment site for Akitsu River Bridge during the foreshock of the 2016 Kumamoto Earthquake. Therefore, to clarify the failure mechanism, it is necessary to estimate ground motions in the damage site with sufficient accuracy, taking into account local site effects. In this study, seismic waveforms in the damage site were estimated based on the extended site-effect substitution method considering location of the strong motion generation areas. The site effects in the damage site were also evaluated based on the temporary aftershock observation.