抄録
Four Layered structure model with S-wave velocities of the Osaka Sedimentary Basin is presented in this paper to calculate long-period seismic response. We conducted microtremor array observation and obtained dispersion curves of Rayleigh waves at 16 sites in the basin. From the dispersion characteristics, we derived layered structure down to bedrock at each site. Compiling the results, we modeled a subsurface structure for the Osaka Sedimentary Basin. We found that the layered structure has common characteristics at all the sites in the Osaka Sedimentary Basin, and concluded that the basin structure can be modeled with four layers. Each layer has S-wave velocity of 0.35, 0.55, 1.0, and 3.2km/s, respectively.
