During the 1970s and early 1980s, poststack time migration of 3-D seismic data was routinely carried out in two steps: The 2-D migration of the traces in one direction was followed by their 2-D migration in the orthogonal direction. This approach was mainly dictated by the state of computer hardware at that time and allowed efficient 3-D migration of stacked data volumes as described in “Efficient 3-D migration in two steps” by Gibson et al. (Geophysical Prospecting, 1983). Advances in computer technology make 3-D poststack depth migration in one step possible on state-of-the-art workstations. However, 3-D prestack depth...

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