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By using the PSPI algorithmGazdag and Sguazzero (1984), the
wave extrapolation with lateral velocity variations can be implemented.
I first use *v*_{1}
and *v*_{2} to do the wave extrapolation separately,
then inverse Fourier transform the wave field to the space domain. Then I
interpolate the wavefield between and
. Finally, I do the Fourier transform again to complete the next wavefield extrapolation in the same way. Figure 1 is a computational flow chart
of this process.

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Stanford Exploration Project

11/17/1997