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| | Abstract | | Microtremor observations were conducted in Matsumoto basin, Japan, to know S-wave structure down to the basement having an S-wave velocity of about 3km/s. We first estimate 1D S-wave profiles from array data of vertical microtremors at 8 sites. Then we made a long-term con tenuous observation of three-components of microtremors at two sites in the area. The data were processed with seismic interferometric procedures to deduce the Green function between the two sites. The group velocity for the vertical component was estimated form the Green function. The group velocity agrees with the calculated one for Rayleigh waves in the 1D profile from the microtremor array exploration. We also discussed group velocities estimated from the Green functions for the radial and transverse components. They are similar to calculated group velocities for Rayleigh and Love waves. |
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