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• W2960441966 abstract "Abstract In multiparameter full-waveform inversion with acoustic approximation for vertically transverse isotropic (VTI) media, it is important to choose an appropriate modeling technique for computational efficiency and numerical stability. In addition, because the gradient is determined by the modeling algorithm used in the FWI process, we need to examine if the modeling algorithm yields the gradient similar to that obtained from the elastic scattering theory. The decomposed equation with mono-component has been proposed because it is computationally efficient and does not generate S-wave artifacts. However, the decomposed equation has the limitation that its numerical scattering potential for anisotropic parameter perturbations is quite different from the theoretical elastic scattering potential. To overcome the limitation, we propose using vector wavefields to compute the gradient in the FWI algorithm. By converting the mono-component (pressure) source and receiver wavefields into the two-component particle displacements using the equation of motion on the staggered grids, we obtain vector virtual sources to compute the gradient direction. Unlike the conventional method, our approach yields PP radiation patterns for anisotropic parameters similar to those obtained theoretically and numerically under the elastic assumption, while retaining computational efficiency achieved by using the mono-component. Numerical examples show that using the correct gradient direction for anisotropic parameters in the FWI process mitigates the trade-off between model parameters." @default.
• W2960441966 created "2019-07-23" @default.
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• W2960441966 date "2019-11-01" @default.
• W2960441966 modified "2023-10-07" @default.
• W2960441966 title "Mono-component multiparameter acoustic full waveform inversion in vertically transverse isotropic media using converted vector wavefields" @default.
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• W2960441966 doi "https://doi.org/10.1016/j.jappgeo.2019.07.010" @default.
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