Layer thickness is important model parameter as far as S-wave velocity that contributes to Rayleigh phase velocity. But, S-wave velocity is only inverted parameters in the traditional Rayleigh-wave inversion process. Thus, using erroneous thickness information in inversion process will cause unreliable or non-unique S-wave velocity profile. However, layer thickness can be incorporated into process by the joint inversion approach to increase accuracy of sub-surface model. This study presents 1D joint inversion of Rayleigh fundamental mode curve with electric sounding data, to use layer thickness as variable in the inversion process, contrary from separate inversion of Rayleigh dispersion curve. The proposed method was tested on noise-free and Gaussian noisy synthetic data. Results demonstrate that reliable vertical shear velocity profile can be obtained by the joint inversion approach, even there is no a priori.


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