S-wave velocity profiling by joint inversion of microtremor dispersion curve and horizontal-to-vertical (H/V) spectrum
S-wave velocity profiling by joint inversion of microtremor dispersion curve and horizontal-to-vertical (H/V) spectrum
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DOI：
10.1785/0120040243
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发表时间：
2005-10-01
影响因子：
3
通讯作者：
Tokimatsu, K
中科院分区：
文献类型：
--
作者：
Arai, H;Tokimatsu, K
提出了一种利用地震动频散曲线和水平垂直(H/V)谱联合反分析估算地下土层S波速(V-S)剖面的方法。在反演中，微动频散和FIN数据都被假定为瑞利波频散曲线和表面(瑞利和乐福)波H/V谱，这是通过考虑其基模和高阶振型的影响而从理论上推导出来的。提出的联合反演方法和常规的单独利用频散资料的联合反演方法一样，是在四个有浅层V-S剖面的地点进行的，这些剖面一直延伸到工程基岩。与常规方法相比，联合反演法得到的V-S剖面与已有的井下速度测井曲线更加吻合。特别是，与传统的反演方法相比，该方法在估算基岩V-S构造方面有了显著的改进。敏感性分析表明，面波H/V比对基岩V-S构造的敏感性大于瑞雷波相速度，证实了H/V谱联合反演的应用前景。
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 FIN 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.