** Next:** Acknowledgments
** Up:** Vlad et al.: Improving
** Previous:** Results

We have shown ways of implementing the amplitude corrections
proposed by Zhang (1993) both by mixed-domain and by
finite-difference methods. We applied them to media of constant velocity, constant
vertical velocity gradient, and of laterally varying velocity. In constant velocity,
and especially for split-step modeling, the boundary condition
correction makes amplitudes comparable to the analytical ones, or to
those obtained by two-way wave equation modeling. In the constant vertical velocity gradient
medium, the correction has the same effect as the WKBJ
correction, but unlike it, it can also be applied in a *v*(*x*,*z*)
medium. Future work will include application of the same procedure to
other laterally varying velocity models and to real data and validation of
*v*(*x*,*z*) results by comparison with results of ray-tracing with amplitudes.

** Next:** Acknowledgments
** Up:** Vlad et al.: Improving
** Previous:** Results
Stanford Exploration Project

7/8/2003