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| RTM using effective boundary saving: A staggered grid GPU implementation | |
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To make sure that the proposed effective boundary saving strategy does not introduce any kind of error/artifacts for the source wavefield, the first example is designed using a constant velocity model: velocity=2000 m/s, 
,
. The source position is set at the center of the model. The modeling process is performed 
time samples. We record the modeled wavefield snap at 
and 
, as shown in the top panels of Figure 6. The backward propagation starts from 
and ends up with 
. In the backward steps, the reconstructed wavefield at
and
are also recorded, shown in the bottom panels of Figure 6. We also plot the wavefield in the boundary zone in both two panels. Note that the correctness of the wavefield in the original model zone is guaranteed while the wavefield in the boundary zone does not need to be correct.
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fig6
Figure 6. The wavefield snaps with a constant velocity model: velocity=2000 m/s,
,
, source at the center. The forward modeling is conducted with
time samples. (a-b) Modeled wavefield snaps at
and
. The backward propagation starts from
and ends at
. (c-d) Reconstructed wavefield snaps at
and
. Note the correctness of the wavefield in the original model zone is guaranteed while the wavefield in the boundary zone may be incorrect (32 layers of the boundary on each side are also shown in the figure).
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| RTM using effective boundary saving: A staggered grid GPU implementation | |
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