Abstract
During the 1948 Fukui earthquake, most of the heavily damaged areas concentrated in the Fukui plain covered with thick Quaternary deposits. This suggests that the Quaternary deposits can be one of the most important factors to elucidate the damage distribution. In this study, the S-wave velocity structure of east-west cross section of the Fukui plain has been estimated based on microtremor array observation. Vertical microtremors were observed at 8 sites around Fukui plain. The Rayleigh wave phase velocities were estimated from a spatial autocorrelation analysis. The phase velocities at each site were inverted to a vertical S-wave profile using a genetic algorithm. For the inversion analysis, initial S-wave models were set by using the correlation between the phase velocities of the Rayleigh wave and the travel-time-weighted average S-wave velocities of the sites. It was confirmed that the estimated S-wave velocity structures are harmonized with existing boring profiles and elastic-wave reflection surveys.
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