COMPARISON OF THE OBSERVED GROUND MOTION AT KIK-NET MASHIKI SITE BY THE 2016 KUMAMOTO EARTHQUAKE AND ESTIMATED GROUND MOTION BASED ON THE INFORMATION OF THE ACTIVE FAULT

Abstract

 The 2016 Kumamoto earthquake was occurred by the active fault which has been evaluated by the Headquarters for Earthquake Research Promotion. The magnitude of the main shock that caused severe damage on structures at Mashiki Town in Kumamoto Prefecture was M_JMA 7.3, but, the magnitude of the Futagawa segment of Futagawa fault zone through the Mashiki Town has been evaluated as M_JMA 7.0.
 In this study, estimated ground motion based on the information of the active fault was compared with the observed ground motion by the main shock at the KiK-net Mashiki site.
 In conclusion, the level of spectrum of estimated ground motion is close to the observation record, but it is lower than observation record at around 1 second period.