From the original velocity model, we generated several velocity model
realizations by applying a percentile perturbation at the overburden zone.
Using each velocity realization, we applied a 2-D prestack wave-equation
migration Prucha et al. (1999) to the synthetic data.
The resulting image is a function of the offset ray parameter *p*_{hx}, which
is related to the aperture angle , the dip along the
in-line direction, and the velocity function ,as follows:

(1) |

Figure 4

4/28/2000