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| | Abstract | | Long-period ground motions for a period of 2-3 seconds were excited in the western part of the Ashigara Valley, during the 2011 off the Pacific coast of Tohoku earthquake. To evaluate site effects for these periods in the Ashigara Valley, we installed temporary earthquake observations and performed subsurface structural surveys, such as array microtremor observations and microtremor measurements of single-station. In this paper, we report the outline of these observations and the tendency of Rayleigh wave phase velocities obtained by the SPAC method applied to data of array microtremors observations. |
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