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| | Abstract | | For the prediction of short-period ground motion, it is important to evaluate effects of the inhomogeneity of shallow soil structure. To model and extract the shallow soil structural variation in the vicinity of Tachikawa-Fault, we conducted microtremor explorations and estimated S-wave velocity structure. The survey was done along the survey line across Tachikawa-Fault with separation of about 50m between each site, and also done in spatially distributed sites. The observed phase velocities of Rayleigh wave show the significant differences in the dispersion across the fault. A 1D S-wave velocity structure was estimated at each site along the line using a hybrid heuristic inversion. The result shows the differences across the fault. The S-wave velocity has a lower velocity layer near the surface in the western part of the fault. |
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