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- W2328479214 abstract "I present an unconditionally stable, implicit finite‐difference operator that corrects the constant‐velocity phase‐shift operator for lateral velocity variations. The method is based on the Fourier finite‐difference (FFD) method. Contrary to previous results, my correction operator is stable even when the medium velocity has sharp discontinuities, and the reference velocity is higher than the medium velocity. The stability of the new correction enables the definition of a new downward‐continuation method based on the interpolation of two wavefields: the first wavefield is obtained by applying the FFD correction starting from a reference velocity lower than the medium velocity; the second wavefield is obtained by applying the FFD correction starting from a reference velocity higher than the medium velocity. The proposed Fourier finite‐difference plus interpolation (FFDPI) method combines the advantages of the FFD technique with the advantages of interpolation.A simple and economical procedure for defining ..." @default.
- W2328479214 created "2016-06-24" @default.
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- W2328479214 date "2001-01-01" @default.
- W2328479214 modified "2023-09-27" @default.
- W2328479214 title "Stable wide‐angle Fourier‐finite difference downward extrapolation of 3‐D wavefields" @default.
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- W2328479214 doi "https://doi.org/10.1190/1.1816250" @default.
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