Computing near-surface velocity models for S-wave static corrections in the t-p domain

Cova, Raul (CREWES, University of Calgary) | Henley, David (CREWES, University of Calgary) | Innanen, Kristopher A. (CREWES, University of Calgary)


Near-surface velocity models for static corrections are usually derived from critically-refracted arrivals. In the processing of P-to-S converted-wave data, critically-refracted S-waves are difficult to identify since they are usually overwhelmed by the surface-wave train which propagates at similar velocities. Here we exploit the differences in the moveout of convertedwave events to compute a velocity model for the near-surface and its corresponding static effects. These effects are derived by crosscorrelating receiver gather data transformed to the τ-p domain. The τ-differences between receiver locations is then used in an inversion process to compute a near-surface velocity model. This velocity model can be used for building migration velocity models or to initialize elastic full waveform inversions.

Presentation Date: Tuesday, October 16, 2018

Start Time: 8:30:00 AM

Location: 213A (Anaheim Convention Center)

Presentation Type: Oral