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Abstract

It has probably occurred to some of the readers that the basis of interpretation by means of the so-called “dip-shooting” method can be found in the last two lessons. It is therefore opportune at this stage to include some pages in which we shall attempt to outline the general ideas and, by a few exercises, to direct the reader's attention to the possibilities of the method.

Suppose, then, that centering about a point P, at a distance x from a shotpoint 0, we have a spread of pickups, Δx in overall length, in line with 0 and over which a reflected wave-front shows a difference in travel-time of Δt (of Figure 37). If, as usual, we indicate the emergence angle of this wave-front at P by α, then we have, for practical purposes, the relation

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