Abstract

This paper proposes an enhancement to the accuracy of the Fourier Finite Difference (FFD) method used in the one-way wave equation. Errors associated with FFD can be magnified in media with strong lateral variations in velocity. To reduce the magnitude of these errors, the reference velocity at each depth may be replaced by a velocity function which is a smooth version of the exact model. An isotropic phase-shift plus interpolation (PSPI) step is first employed to compute the wavefield propagation with this intermediate velocity function, followed by corrections for anisotropy and residual velocity variations implemented using finite difference (FD). To illustrate the accuracy of the method, several migration examples are shown.

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