next up previous [pdf]

Next: Migration with low velocity Up: GULF OF MEXICO SALT Previous: Aliased migration

Anti-aliasing is not needed to image the salt flank

The interesting thing about the images migrated without anti-aliasing is that in all cases the salt flank is nicely imaged at late times. This is because in this region the migration velocity is fast and the operator does not have much dip, so that $f_{op} > f_s$ and operator aliasing is not a problem. At earlier times, the migration velocity is lower and the operator has significant dip so that $f_{op} < f_s$ and operator aliasing is a problem.