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| | Abstract | | A field experiment of 3D ambient noise tomography with a dense array has been conducted to evaluate the applicability of the method for near surface investigations. We observed ground motion caused by running around the receiver array as well as ambient noise at steady state by forty-nine cable-less seismographs deployed by 2.5 m intervals. Dispersion curves for the frequency range between 5 and 30 Hz were obtained by CMP-SPAC method. 1D S-wave velocity models were estimated by an inversion based on non-linear least square method at each CMP, and we converted them to a 3D model by a spatial interpolation. The obtained S-wave velocity model agrees with existing geological information at the site. The time required for the survey was only 3 hours including a deployment and removal of the receivers |
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