Estimation of shear velocities from P-P and P-S seismic data

Thais A. Guirigay, John C. Bancroft

Prestack migration of converted wave data requires accurate acoustic and shear velocities Vp and Vs. New methods to estimate the shear velocities using a single converted wave velocity Vc are shown in this paper.

The estimated shear velocity Vs is used with Vp in a full prestack migration using the equivalent offset method to form complete prestack migration gathers. This process is referred as converted wave equivalent offset migration (C-EOM). The quality of the method is demonstrated with a one real dataset.