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| Abstract | In order to clarify the difference of seismic intensities at Ofunato City, conventional microtremor array observations were carried out at 14 sites. An array consists of four vertical seismometes. The sensor spacing was 6m. Phase velocities of Rayleigh waves were estimated from array records of vertical microtremors by SPAC method. Average S-wave velocities were estimated from phase velocities of Rayleigh waves with a wavelength of 40 m by using empirical relations proposed by Nagao and Konno(2000). We compared to the estimated AVS distribution with the seismic intensity distribution. It was revealed that the AVS was small at the area where the seismic intensity was large. The correlation coefficient between the AVS distribution and the seismic intensity distribution was -0.82. |
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