Estimation of Shallow-to-Deep Shear Wave Velocity Structure from Joint Inversion of Surface-wave Phase and Group Velocities

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  • Rayleigh波位相速度と群速度の同時逆解析による浅部～深部地盤のS波速度構造の推定

Abstract

<p>We investigated the possibility of joint inversion of surface-wave phase and group velocities toward better estimation of subsurface S-wave velocity structure model. Our numerical experiments showed that the combined use of phase and group velocities that will be obtained from the same dataset has an advantage in constraining thickness and S-wave velocity of the shallower layers without deploying smaller arrays. We applied this technique to microtremor array data measured in the Kathmandu Valley, Nepal (sensor to sensor distances range from 137 to 801 m). Distinct wave trains corresponding to surface waves (Rayleigh and Love waves) were detected by seismic interferometry, making it possible to obtain dispersive characteristic of surface-wave group velocities in the higher frequency range. The estimated S-wave velocity structure model using the joint inversion without smaller array (r > 240 m) corresponds well to those of existing results, indicating that our approach can be a reasonable tool to reduce time and effort for actual microtremor survey.</p>

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