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| | Abstract | | It has already been demonstrated that an estimate of the Greens function can be obtained from the cross-correlation of long-time ambient noise between two stations, and it can be possible to extract the surface-wave group velocity. We have started observation of ambient noises in the southern Kanto area from March 2008, and the data were processed for estimating the Greens functions. The result shows that the estimated Greens functions propagate by the different velocities because of the complexity of geology of this area. Furthermore, they have specific azimuthal dependence. Finally, we estimated the surface wave velocity from the estimated Greens function assuming a straight path. The result compares favorably with previous estimates of microtremor exploration. |
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