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| | Abstract | | For the purpose of estimation on the S-wave velocity structure in the Ashigara Valley, we conducted microtremor array measurements with the array size of several meters to 500 meters. Small size of array exploration revealed the spacial variation of shallow soil structures in the vicinity of the damaged area during the 2011 off the Pacific coast of Tohoku Earthquake (Mw.9.0). The large size of array exploration revealed the deep structure which has the S-wave velocity of more than 1000 m/s. The comparison of H/V spectral ratio between observation and theory using the estimated S-wave velocity structure showed good agreement, suggesting the modeling of S-wave velocity structure is appropriate. Both of the shallow and deep S-wave velocity structure in the Ashigara Valley produce the ground motion at the period of about 2 seconds. |
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