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Seismic Wave Propagation Through Random Media Published online by Cambridge University Press: 31 October 2024
In von Karmam-type random media, when the center wavenumber is higher than the corner wavenumber of the PSDF and the phase shift across the correlation length is not small enough, the conventional Born approximation is not applicable. To overcome this difficulty, Chapter 7 presents an ongoing study of a hybrid MC simulation using the spectrum division method for scalar/vector wavelet propagation. Taking the center wavenumber as a reference, we divide the PSDF into two parts, then we serially use the Born wide-angle scattering for the high-wavenumber spectral component and the Eikonal narrow-angle ray bending and travel distance fluctuation for the low-wavenumber spectral component. For the elastic case, the synthesized three-component RMS velocity amplitude time traces are compared with the ensemble average of the FD simulation results in realized random elastic media.
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