Simulation of building damage distribution in downtown Mashiki, Kumamoto, Japan caused by the 2016 Kumamoto earthquake based on site-specific ground motions and nonlinear structural analyses

Abstract Most of the buildings damaged by mainshock 2016 Kumamoto earthquake were concentrated in downtown Mashiki Prefecture, Japan. We obtained 1D subsurface velocity structures at 535 grid points covering this area based on 57 identified models, used linear and equivalent analyses to obtain site-specific ground motions, generated detailed distribution maps peak acceleration Mashiki. determined construction period every individual building target corresponding updates Japanese codes. Finally, we estimated damage probability nonlinear response model wooden with different ages. The map probabilities was similar ratios from a field survey, moderate northwest where no survey conducted. found that both site amplification houses are important factors for evaluating seismic risk structures.