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Abstract

It might already have occurred to some of the readers that the methods described in Lesson No.8 (pp. 31 et seq.) can readily be extended to cover the more general case of reflection data from a dipping interface. It is the purpose of this lesson so to extend those methods; and, as before, we shall do so by a numerical example. We might mention here, too, as we have mentioned before, that the method has its analytic analogue. The numerical method here described has been found to be the most practical for solving the problem with the type of data usually available.

To be specific, then, suppose that we have a spread on one side of a shot-point o running from 2,000 ft to 3;000 ft and that the corrected travel-times to the first and last pickups are, respectively, 1.332 and 1.353 sec. Suppose, further, that on the other side of 0 and in line with this spread we have another spread from 2,000 ft to 3,00'0 ft and that the travel-times to the first and last pick-up are, respectively, 1.377 and 1.420 sec. The situation is indicated in Figure 33.

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