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We thank Guojian Shan for his advice regarding finite differencing
and for the two-way wave equation modeling program used
for curve 2 in the top and middle panels of Figure , to
Norm Bleinstein for bringing this topic to our attention during a
recent visit to SEP, and to Bill Symes for the velocity model shown in
Figure .
**triptik
**

Figure 4 Wavefields of a shot propagated
through the velocity model in Figure . **Left**
panels: split-step; **Right** panels: finite difference; **Upper**
panels: no amplitude correction; **Middle** panels: boundary
condition correction () correction only; **Lower**
panels: both boundary condition () and correction.

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Stanford Exploration Project

7/8/2003