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S-Wave Velocity Profiling by Inversion of Microtremor H/V Spectrum

Earthquake Disaster Mitigation Research Center
National Research Institute for Earth Science and Disaster Prevention
4th Floor, Human Renovation Museum
1-5-2 Wakinohama-kaigan-dori, Chuo-ku
Kobe, Hyogo 651-0073, Japan
arai{at}edm.bosai.go.jp
(H.A.)

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 method for estimating the S-wave velocity (V_S) profile of subsurface soils is proposed, based on inversion of the horizontal-to-vertical (H/V) spectrum of microtremors observed with a three-component sensor. For this purpose, theoretical formulas are derived for computing the H/V spectrum of surface waves propagating on a layered half-space in which the effects of the fundamental and higher modes are taken into account. An inverse analysis using microtremor H/V spectrum is then presented for estimating S-wave velocity profiles of subsurface soils. Assuming that either the V_S values or the thicknesses of the shallow soil layers are known, the remaining unknowns are sought. The inverse analyses are performed using the H/V spectra observed at six sites, and their shallow V_S profiles are estimated. The inverted S-wave velocity profiles are consistent with available downhole velocity logs at the sites. The standard error ratios of the inverted values are less than about 0.1, with a maximum of 0.2.

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