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Effective filtering of artifacts for implicit finite‐difference paraxial wave equation migration 1
Author(s) -
Bunks C.
Publication year - 1995
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1995.tb00132.x
Subject(s) - paraxial approximation , extrapolation , wave equation , finite difference , stack (abstract data type) , finite difference method , mathematics , computer science , algorithm , mathematical analysis , physics , optics , beam (structure) , programming language
Implicit finite‐difference implementations of the paraxial wave equation are widely used in industrial prestack and post‐stack migration programs for imaging and velocity analysis. This type of implementation gives rise to numerical artifacts which, in general, do not degrade image quality but which do impede effective velocity analysis. This paper reviews the artifacts generated by the paraxial approximation and a post‐extrapolation, spatially varying filtering scheme is described which completely eliminates these artifacts. The method is illustrated with numerous examples.