We present a case study where a multitude of walkaway vertical seismic profiling (WVSP) data was employed in evaluating the accuracy of anisotropic velocity models used in a prestack depth migration (PSDM) project. We integrated the WVSP traveltimes with surface seismic PSDM residual moveout on migrated common-image gathers (CIG) in a joint inversion that determined the anisotropic model parameters. The resulting anisotropic model significantly reduces the mis-ties between the modeled and observed first arrivals in the various WVSP lines, in addition to the enhancement in CIG flatness and significant im-provement in imaging.

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