Conclusions

We continue the work of Vlad et al. (2003) on implementing the Zhang amplitude corrections for wavefield extrapolation imaging. We apply the corrections to the case of propagation through a less particular v(x,z) velocity model than the one used in the previous paper. The corrections result in an increase in wavefield focusing. We apply with encouraging results the boundary condition correction to the linearized downward continuation used in wave-equation migration velocity analysis. The propagation operator correction, however, is not applicable to linearized downward continuation.