Effect of Considering Spatial Correlation of Ground Motion Intensity on Seismic Damage Estimation

The seismic damage estimation using the empirical attenuation relationship is conducted for evaluating effects of spatial correlation between intra-event residuals. By approximating the correlation matrix in a sparse matrix, we can generate intra-event residuals with considering a spatial correlation more efficiently and apply this method to a great earthquake. We estimate seismic damages on the Nankai Trough Earthquake and the Sagami Trough Earthquake. By comparison with seismic damages calculated with spatially correlated residuals and spatially uncorrelated residuals or perfect correlated residuals, we found the frequency distributions of damaged buildings are different. The result indicates our method takes into account diversity and uncertainty of earthquake in the seismic damage estimation simply.