Abstract
To investigate an application of seismic interferometry to exploration of subsurface layer, in this report, we applied the seismic interferometry to continuous microtremor data recorded at 5 stations deployed in a site, where horizontal stratification was approximately confirmed under the linear array of 340m. As a result, Rayleigh wave group velocity and phase velocity obtained by cross correlations of seismic interferometry agreed those velocities for the fundamental mode calculated by the subsurface layer, which was estimated by array microtremor data, in the frequency range of 2 to 10 Hz. The wavelength obtained by Rayleigh wave was in the range of the space and time response of two station array by the seismic interferometry; therefore, we concluded that Rayleigh wave group velocity and phase velocity in a frequency more than 2 Hz could be estimated, using continuous microtremor data in the linear array of several hundred meters. Also, by evaluating RMS of signal and noise for continuous microtremor data, we found that the stable results were obtained by seismic interferometry applying to microtremor data of 20 hours in this observation.
