SEGJ Technical Conference

Integration of the Structure Model at Fujisawa City, Estimated by S-wave Velocity Model using Microtoremors.

Abstract In this study, a detailed subsurface structure with about 50m intervals, was obtained based on microtremor measurements carried on in the whole area of Fujisawa city. An initial ground structural model was made by borehole data offered from the Fujisawa city. The reverse-analysis by the H/V spectral ratio and the phase velocity was applied on the initial model. A final structural model was made from statistic averaging the individual S wave velocity at the same geological layer. The spectral amplification rate obtained from our model is consistent with that of earthquake ground motion recorded by the K-NET Fujisawa station.