Page 549 - Acquisition and Processing of Marine Seismic Data

540 11. SEISMIC MIGRATION

FIG. 11.48 (A) Migration result of a stack section with 3.125-m trace interval using an unaliased migration operator.
(B) Migration result of decimated version of the same stack section used in (A) into 6.25-m trace interval. A Kirchhoff poststack
time migration is used as the imaging algorithm. Operator aliasing causes noisy migration images (red arrows).

FIG. 11.49 (A) A synthetic zero offset section with a diffraction hyperbola and a steeply dipping event, and its Kirchhoff
migration results (B) with and (C) without antialiasing filter option during the migration. Aliasing causes systematic noise
close to the surface.