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| | Abstract | | Development of simplified method to examine a geological subsurface structure around the discontinuities, such as a gap and a step, between the active faults is one of the key issues for evaluation of total rupture length of active faults. In this research, we conducted microtremor measurements along a trench site of the Tachikawa fault in order to compare the distribution of shallow subsurface geological layers with the spatial variations of horizontal-to-vertical spectral ratio (H/V spectral ratio). We might found that the variation of peak frequencies of the H/V spectral ratios in higher frequency range indicates the difference of the thickness of the shallowest subsurface layer, which is observed in the trench across the fault. Our results suggest that the microtremor survey can be the applicable to the active fault research. |
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