Time Migration Velocity Analysis with Anisotropy Applied to PS Seismic Data

E014 TIME MIGRATION VELOCITY ANALYSIS WITH ANISOTROPY APPLIED TO PS SEISMIC DATA Introduction 1 Recently intensive efforts have been carried to develop processing workflows for converted S-waves particularly for velocity analysis and time imaging. In all approaches the difficulty comes from the high number of velocity parameters required to obtain flat accurate common conversion gathers. In vertically heterogeneous VTI media Thomsen (1999) showed that the location of the conversion point is asymptotically controlled by the effective dimensionless parameter γeff and at finite offsets also by the ratio γ0 between vertical S and P travel times. The moveout curve is described