Translations:Migration - book/12/en

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Many admissible depth points (x,y,z) can contribute to this amplitude (Figure 6a). All of those admissible depth points must be taken into account (Figure 6b). The digital process called migration takes the given amplitude and moves (i.e., migrates) that amplitude to each and every admissible depth point (x,y,z). This process is done for all the amplitudes on each primaries-only trace. The results then are summed, and behold, an image of the geologic structure g(x,y,z) emerges. The principle used is that of Huygens, in which the summation of all the individual responses yields the correct overall response.