SEGJ Technical Conference

Seismic interferometry analysis of short-period microtremors observed with a linear seismometer array for estimating two-dimensional shallow S-wave velocity structures -An experiment in Morioka City-

Abstract We analyzed the three component short-period microtremor records observed with a linear array based on seismic wave interferometry. First, for the cross-correlation analysis, we could see the characteristic phase propagating in the EW and UD directions but could not see the characteristic phase propagating in the NS components. For the group velocity estimation, the SN ratios were low especially in the NS direction, so we could not estimate the correct group velocity. On the other hand, the observed group velocity in the EW direction was good agreement with the calculated one in the frequency range of about 3 Hz to 8 Hz. As a result of displaying the group velocity in two dimensions, it was possible to express the pseudo structure with the transverse component in the 20 m survey line, and it was found that there was no change in the two dimensional velocity in the area.