Combining surface-wave phase-velocity dispersion curves and full microtremor horizontal-to-vertical spectral ratio for subsurface sedimentary site characterization
Combining surface-wave phase-velocity dispersion curves and full microtremor horizontal-to-vertical spectral ratio for subsurface sedimentary site characterization
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DOI：
10.1190/int-2016-0021.1
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发表时间：
2016-11-01
影响因子：
1.2
通讯作者：
Sanchez-Sesma, Francisco Jose
中科院分区：
文献类型：
--
作者：
Lontsi, Agostiny Marrios;Ohrnberger, Matthias;Sanchez-Sesma, Francisco Jose
我们计算地震速度剖面联合反演的面波相速度频散曲线连同全频谱的微动水平垂直（H/V）的频谱比在两个沉积物覆盖的网站在德国。第一个试验场的沉积物厚度约为100米，第二个试验场的沉积物厚度约为400米。我们已经使用了扩展的物理模型的基础上的扩散波场假设的解释所观察到的微动H/V谱比。该扩展包括解释在深度（钻孔）观察到的微动H/V频谱比。这种全波场方法考虑了体波和表面波的能量贡献，因此可以反演浅层地下的特性。我们已经获得了多模相速度频散曲线从一个独立的研究，并描述提取的分支和他们的解释。反演结果表明，联合使用地震环境噪声和主动生成的面波数据的方法将提高重建的近地表速度模型的精度，微分区，岩土工程，地震静校正和储层成像的关键步骤。
We compute seismic velocity profiles by a combined inversion of surface-wave phase-velocity dispersion curves together with the full spectrum of the microtremor horizontal-to-vertical (H/V) spectral ratio at two sediment-covered sites in Germany. The sediment deposits are approximately 100 m thick at the first test site and approximately 400 m thick at the second test site. We have used an extended physical model based on the diffuse wavefield assumption for the interpretation of the observed microtremor H/V spectral ratio. The extension includes the interpretation of the microtremor H/V spectral ratio observed at depth (in boreholes). This full-wavefield approach accounts for the energy contribution from the body and surface waves, and thus it allows for inverting the properties of the shallow subsurface. We have obtained the multimode phase velocity dispersion curves from an independent study, and a description of the extracted branches and their interpretation was developed. The inversion results indicate that the combined approach using seismic ambient noise and actively generated surface-wave data will improve the accuracy of the reconstructed near-surface velocity model, a key step in microzonation, geotechnical engineering, seismic statics corrections, and reservoir imaging.