Migration = focus + map , by Joe Dellinger & Francis Muir

Depth migration is viewed as a two-step process: the data is focused and then the focused image is mapped to true depth. It is not necessary to know the complete velocity and anisotropy structure to focus the data, but to make a true depth image it is. As a simple example, we consider the case of depth migration in the presence of elliptical anisotropy with an arbitrary axis. In this case standard isotropic constant-velocity migration focuses the data exactly, but a linear transformation is still required to map the result to a true depth image.


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