Joint inversion of high-frequency surface waves with fundamental and higher modes |
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| Authors: | Yinhe Luo Jianghai Xia Jiangping Liu Qingsheng Liu Shunfang Xu |
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| Institution: | aInstitute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei 430074, China;bKansas Geological Survey, The University of Kansas, 1930 Constant Avenue, Lawrence, Kansas 66047-3726, USA |
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| Abstract: | Joint inversion of multimode surface waves for estimating the shear (S)-wave velocity has received much attention in recent years. In this paper, we first analyze sensitivity of phase velocities of multimodes of surface waves for a six-layer earth model, and then we invert surface-wave dispersion curves of the theoretical model and a real-world example. Sensitivity analysis shows that fundamental mode data are more sensitive to the S-wave velocities of shallow layers and are concentrated on a very narrow frequency band, while higher mode data are more sensitive to the parameters of relatively deeper layers and are distributed over a wider frequency band. These properties provide a foundation of using a multimode joint inversion to define S-wave velocities. Inversion results of both synthetic data and a real-world example demonstrate that joint inversion with the damped least-square method and the singular-value decomposition technique to invert high-frequency surface waves with fundamental and higher mode data simultaneously can effectively reduce the ambiguity and improve the accuracy of S-wave velocities. |
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| Keywords: | Surface wave Fundamental mode Higher modes Sensitivity Joint inversion |
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