Kirchhoff migration of 2-D post-stack seismic data after subband decomposition

In this paper we present a subband decomposition approach to seismic migration. It gives an interpretation of the seismic data in terms of a multiscale representation. The proposed subband migration consists of the usual extrapolation and imaging steps and provides a scheme that in principle is efficient. The extrapolation and imaging stages are performed completely in the subband domain without synthesis filtering into the space domain at each time step. Unfortunately, unwanted cross-terms are introduced due to aliasing. Nevertheless, a step-by-step multiscale approach gives the user a handle to choose between resolution and efficiency. The applicability of the proposed subband migration is illustrated with synthetic 2-D post-stack seismic data examples