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S-Wave Velocity Profiling by Joint Inversion of Microtremor Dispersion Curve and Horizontal-to-Vertical (H/V) Spectrum

¹ Earthquake Disaster Mitigation Research Center
National Research Institute for Earth Science and Disaster Prevention
Human Renovation Museum
1-5-2 Wakinohama-kaigan-dori, Chuo-ku, Kobe
Hyogo 651-0073, Japan
arai{at}edm.bosai.go.jp
 (H.A.)

² Department of Architecture and Building Engineering
Graduate School of Science and Engineering
Tokyo Institute of Technology
2-12-1 O-okayama, Meguro-ku
Tokyo 152-8552, Japan
kohji{at}o.cc.titech.ac.jp
 (K.T.)

A joint inverse analysis using both microtremor dispersion curve and horizontal-to-vertical (H/V) spectrum is proposed for estimating the S-wave velocity (V_S) profiles of subsurface soils. In the inversion, both microtremor dispersion and H/V data are assumed to be the Rayleigh-wave dispersion curve and the surface (both Rayleigh and Love) wave H/V spectrum that have been theoretically derived by taking into account the effects of their fundamental and higher modes. The proposed joint inversion as well as the conventional one using dispersion data alone is performed at four sites where shallow V_S profiles down to engineering bedrock are available. The V_S profiles estimated by the proposed joint inversion are more consistent with available down-hole velocity logs than those by the conventional method. In particular, the proposed inversion shows significant improvement in estimating bedrock V_S structures compared to the conventional inversion. Sensitivity analyses indicate that the surface-wave H/V ratio is sensitive to the bedrock V_S structure more than the Rayleigh-wave phase velocity, confirming that the proposed joint inversion including H/V spectrum is promising.

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