Abstract
Reverse-time migration of zero-offset data for acoustic waves has been successfully implemented by Whitmore (1983), Baysal et al. (1983), McMechan (1983), and Loewenthal and Mufti (1983). In reverse-time migration, data recorded on the surface are used as the boundary condition and are extrapolated backward in time (Whitmore, 1983; Levin, 1984). Reverse-time migration is mathematically a well-posed problem. This is in contrast to conventional depth-extrapolation-migration schemes, in which the surface data are initial-value conditions for solving the wave equation. Reverse-time migration may offer improvements over conventional depth migration due to its freedom from dip-angle limitations.
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