Translations:Dictionary:Normal moveout (NMO)/2/en

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The NMO correction applied to long-offset data generally creates a ‘‘hockey-stick’’ effect giving long-offset traveltimes that are too small and causing waveshape broadening and loss of resolution. For long-offsets the reflection curvature becomes nonhyperbolic because of vertical changes in velocity and anisotropy and a nonhyperbolic normal-moveout analysis (q.v.) has to be used. Reflector dip also has effects that often require a DMO correction. The functions of the NMO and DMO operations are illustrated graphically in Figure D-20e.