Migration can be viewed in the time domain as a process whereby the plane waves echoed from a source to a geophone by a reflecting point are shifted in time to a common intersection. The time shift determines the phase shift applicable in the frequency domain to the associated Fourier component of the seismic section. Table of shifts for an appropriate sample of plane-wave directions, to be used for interpolation in the migration process. Computer experiments with synthetic data.--Modified journal abstract.

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