Dip‐moveout by fourier transform

Geological controls on focused fluid flow through the gas hydrate stability zone on the southern Hikurangi Margin of New Zealand, evidenced from multi-channel seismic data

“…Data pre-processing CMP gathers to be inverted were corrected for the effect of geometric spreading, broad band-pass filtered (corner frequencies of 4, 8, 100 and 120 Hz), and muted above the seafloor reflection. Where dipping reflections were involved, CMPs were corrected for the effect of dip-moveout (DMO) (Hale, 1984).…”

First seismic imaging results of tectonically complex structures at shallow depths beneath the northwest Canterbury Plains, New Zealand

“…To image reflections in regions of high structural complexity it was necessary to resort to partial pre-stack depth migration or dip-moveout (DMO) processing (Hale, 1984;Notfors and Godfrey, 1987). After application of DMO processing, adjacent and overlapping reflections with contrasting dips were separated, smearing of reflection points at dipping structures was minimised, the stacking velocities were independent of reflection dip and easier to pick, and steeply dipping artefacts were reduced, thus resulting in lower levels of migration noise (Notfors and Godfrey, 1987).…”

Squeezing dip moveout for depth‐variable velocity

“…Briefly, we derive a time-variable scaling function that we use to squeeze a constantvelocity DMO operator so that it approximates an exact DMO operator for a wide range of offsets and reflector dips. This approach was first proposed by Rocca (1982, personal communication), was developed by Rocca and others (Hale, 1983(Hale, , 1988Bolondi and Rocca, 1985;Deregowski, 1985Deregowski, , 1987, and has been used in various forms in the seismic processing industry. In this paper, we summarize and enhance this approach, and demonstrate its effectiveness with applications to synthetic and recorded seismic data.…”