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Algorithm efficiently migrates seismic data in inhomogeneous media, suggesting improvements for 3-D surveys.
The paper presents an algorithm of fast migration of seismic records oriented at two-dimensional background velocity models. Migration and focusing (stacking) of data from multifold coverage profiles are performed in the domain of space-time frequencies. Dynamics of the 3-D propagation and scattering of waves is taken into account in the framework of Born’s approximation for the models of effective velocities. in inhomogeneous media. The algorithm presented is used for a set of constant velocity values with a subsequent transformation of the derived set of sections into a final image-section with a presumed velocity law. Estimates of migration effective velocities are obtained simultaneously with synthesizing stacked sections. The algorithm discussed is easily generalized for the case of 3-D seismic surveys.
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Zhernjak et al. (1991) studied this question.
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