APPLICATION LIMITATION AND EXPANSION OF ESTIMATION APPROACH OF VELOCITY STRUCTURE TO SEDIMENTARY BASIN WITH 3D IRREGULAR BASIN-BEDROCK INTERFACE USING

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The survey using microtremor H/V techniques is usefulness for estimating the basin structures. However, the reliability of subsurface structural models in the irregular region of a basin-bedrock interface estimated by the H/V spectra of microtremors is debatable because these features of microtremors are calculated from a 1D horizontally stratified model. To investigate the behavior of the H/V spectra in the irregular region, the 3D numerical simulation of microtremors for the Osaka 3D sedimentary basin model is conducted. It is concluded that the estimation of the depth of sedimentary layer based on the 1D model gives a result quite different from that of the reality at the irregular region.