Efficient 2D FD-K Modeling in Heterogeneous VTI Media

P183 EFFICIENT 2D FD-K MODELING IN HETEROGENEOUS VTI MEDIA 1 Summary An efficient 2D time-domain numerical modeling algorithm based on the hybrid finite-differencewavenumber (FD-K) method has been developed for the calculation of synthetic seismograms through heterogeneous isotropic and anisotropic (VTI) elastic grid models. The FD-K method is an extension of the Alekseev-Mikhailenko semi-analytical method of separation of variables to 2D VTI models with arbitrary lateral velocity variations. It represents a combination of the wavenumber (K-) transform with respect to the horizontal in-plane coordinate and a finite-difference (FD) scheme in the remaining vertical and time coordinates. We apply the K-transform to