f True amplitude migration taking fine layering into account

The underlying assumption of any migration scheme is that a macro model of the subsurface accurately accounts for the propagation effects from the acquisition surface to the target and vice versa. A macro model consists of a number of geologically oriented macro layers, separated by macro boundaries. In general, the velocity and density in each macrolayer are chosen to be simple functions of position (for instance linear functions of depth, accounting for the depth dependent compaction properties).