Development and application of S-wave velocity structure estimation procedure based on generalized spectrum density ratios of microtremor

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The objectives of this study are to introduce the inversion analysis of the microtremor generalized spectrum density functions for estimating S-wave velocity structure of sedimentary site and to examine the reliability and accuracy of the proposed inversion procedure. The inversion analyses are conducted using the generalized spectrum density functions observed at 75 sites around the Fukui plain, and their S-wave velocity structures down to the Tertiary bedrock are estimated. The 3D configuration models of the Fukui Plain and the Ohno basin have been evaluated by using geo-statistical procedure. By comparing with the inverted structure of gravity anomaly observation and with the existing data, thevalidity of the estimated structure was confirmed.