Translations:Mathematical foundation of 3-D migration/29/en

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Additional problems arise when more accuracy is desired; the X and Y terms in equation (G-3) no longer are decoupled. For example, the 45-degree approximation (Section D.4) to equation (G-3) introduces cross terms. Another approximation is to represent the single square root in equation (G-3) by two square roots [1] as

  1. Ristow (1980), Ristow, D., 1980, 3-D downward extrapolation of seismic data in particular by finite-difference methods: PhD thesis, University of Utrecht, The Netherlands.