What is the fine-grained topic of the following text: I describe a processing technique which takes seismic data in the frequency - slowness (u) — p) domain, properly corrects it for slant wave propagation in a finely layered medium, and produces an instantaneous AVO intercept and an azimuthally varying AVO gradient as functions of vertical traveltime. Only return the topic.
Seismic data processing technique for slant wave propagation correction