The first special section on prestack depth migration (PSDM) was published in May 2001. The papers provided a synopsis of the state of PSDM at that time. In fact, some issues limiting greater employment of PSDM described in that special section are still prevalent today—i.e., poor data quality, improper geologic models and velocity fields, inaccurate processing algorithms, anisotropy, near surface effects, lack of true amplitude preservation, and relatively high computing costs to run the full wave equation PSDM algorithms. However, the industry has since made great strides to resolve these issues because of the rapid growth in computing power and...

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