||Measuring velocity from zero-offset data by image focusing analysis||
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Measuring velocity from zero-offset data by image focusing analysis
Migration velocity can be estimated from zero-offset data
by analyzing focusing and defocusing of residual-migrated images.
The accuracy of these velocity estimates is limited
by the inherent ambiguity between velocity and reflector curvature.
However, velocity resolution improves
when reflectors with
different curvatures are present,
as demonstrated by simple synthetic examples.
The application of the proposed method to
zero-offset field data recorded in the New York harbor
yields a velocity function that is consistent with available
geologic information and clearly improves the
focusing of the reflectors.