Anisotropy with PSDM

PSDM can use either an eta model, or grids of epsilon and delta.

Depth Interval Model

Eta Model

With Eta

Without Eta

Variable eta for Anisotropy

• PSTM uses either a single eta function, or a grid of eta values
• Eliminate the effects of anisotropy
• Pick the best eta to flatten the gathers
• Solved from analysis of p-wave data

Without Eta

The gather on the left is the original raw gather. The panel below is the same gather migrated with different settings of eta