Strong Ground Motion Simulation for the 2005 Central Chiba Prefecture Earthquake with Pseudo Point-source Model

Abstract

Strong ground motion simulation was conducted for the 2005 Central Chiba Prefecture earthquake (M_J6.0) with the pseudo point-source model. For some sites where the site amplification factor was not available, it was newly evaluated by using past earthquake records at neighboring stations and microtremor measurements. Although the results showed generally good agreement with the observation, it was inferred that the model could be improved by considering directivity effect which was not included in the current model. At some stations, the peak frequency of Fourier spectrum was overestimated. The cause of the discrepancy should be revealed in the future study.