f Migration velocity analysis by migration of velocity spectra

Migration of seismic data is required to collapse diffractions and position reflectors in the correct spatiallocation. Today's accurate migration algorithms applied to high-resolution seismic data can, in theory, produce accurate images of nearly vertical structures. However, in practice, migration accuracy depends not only on the accuracy of the migration algorithm, but also on the accuracy of the migration-velocity field. Indeed, as dip increases, accuracy in migration becomes critically dependent on the migration velocity.