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| | Abstract | | The purpose of this research is to perform seismic wave interferometry analysis for microtremor horizontal records of 10 broadband linear array observations made in Fukushima prefecture. The cross correlation functions were calculated for the observed microtremor horizontal records and the group velocity dispersion curves and the SN ratios were estimated by multiple filter analysis. From a comparison of the observed group velocities with calculated ones by Nishida's Vs model, the observed group velocities were smaller than the calculated ones. We tried to distinguish body waves and surface waves by using RZ and ZR cross-correlation functions based on Takagi et al. (2014) method, and the group velocity dispersion curves and the SN ratios were estimated. The SN ratios calculated from surface waves, RR and ZZ were compared. The SN ratios of the surface wave has almost the same value as ones of ZZ, but it was found that the surface wave as a larger value than ones of RR. And three group velocities were calculated and compared. It was found that the three group velocities were almost the same at the periods with the SN ratio of 10 or more and were continuously distributed at about 2-3 km/s. |
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