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Analysis of depth-migrated gathers is the basis of most interval velocity estimation techniques. These gathers, known as common image gathers (CIGs), should consist of flat events when the velocity used for the migration is correct (Faye and Jeannot, 1986; Al-Yahya, 1989). As a result of this assumption, interval velocity analysis has become a procedure of flattening events in CIGs.
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Moshe Reshef (2001) studied this question.
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