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| | Abstract | | We performed micorotremor array measurement and continuous microtremore measurement to estimate S-wave velocity structure in Ojiya city, Niigata prefecture, Japan. We estimated S-wave velocity structure model for shallow soil at temporary strong motion stations which observed strong motions due to the M6.1 aftershock of the 2004 Mid Niigata prefecture earthquake. To understand the variety of strong ground motions in Ojiya city, we compared shallow soil and seismic intensities, but there was no clear correlation between average velocity of 30m depth and seismic intensities of strong ground motions due to the aftershock. Further analysis on deep sedimentary layers is necessary to understand variety of ground motions. |
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