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| | Abstract | | To evaluate ground response characteristics in the western to middle parts of Ashigara Valley, we performed temporary ground motion observation and microtremor array observation. The ground motions observed at temporary stations shows significant peak at a period of 1 sec at each station. Rayleigh wave phase velocity dispersion curve estimated using SPAC method revealed the low velocity above 5 Hz and showed significant dispersion below 5 Hz at temporary stations. The observed ground response characteristics has shown general peak at 1 sec and it was large especially at the stations, which observed large ground motion during the 2011 Tohoku earthquake. |
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