Lesson No. 19: Single Layer Reflection and Refraction Paths
Published:January 01, 1959
In addition to the two “minimum time” paths from 0 to P of Figure 54 (the “direct,” straight line path OP, and the reflected path ORP) that we have discussed in the last lesson, there is yet another of basic importance, insofar as the problem of two beds is concerned, provided that the velocity of propagation, V2, in the lower bed is greater than the velocity, VI, in the upper bed. This third path which we shall now introduce is a refraction path.
We begin by reconsidering the wave fronts involved in these two minimum time paths. As a consequence of the shot explosion at 0 (Figure 56), the energy radiates from that point so that the successive positions of the wave front are spheres and the corresponding paths are the straight lines radiating from O. We consider simply a vertical plane section of this situation and, for the present, also assume the interface 1'1 to be a plane parallel to the surface S'S, so that all vertical sections through 0 are alike.
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Lessons in Seismic Computing
“An elementary text and problem book containing 44 lessons in seismology arranged for selection or combination to cover the normal 36-week course, or for condensation into an 18-week course. The lessons begin without assuming more than secondary school mathematics. An elementary knowledge of calculus is desirable, though not required, for the last half of the book.”