New PDF release: Applied Geophysics U.S.S.R.

By Nicholas Rast

ISBN-10: 008009662X

ISBN-13: 9780080096629

Ebook by means of rast, nicholas

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By Nicholas Rast

ISBN-10: 008009662X

ISBN-13: 9780080096629

Ebook by means of rast, nicholas

Show description

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Extra resources for Applied Geophysics U.S.S.R.

Sample text

Surface with the interface as the geometric locus of the projection of traces of intersection with the interface of the individual rays. Let us take a particular example in order to examine the technique for deter­ mining the projection of the points of intersection of the ray with the interface. To do this we shall select from the total number of rays forming the conic surface one ray for example with an azimuth of 70°. Its projection on the horizontal plane is shown in Fig. 5, a, and the section of the vertical plane along the lines /—/, that is in the direction of the ray in Fig.

The construction of the medium is shown in Fig. 10, b. 2. The source of excitítion is in both cases above the slope of the dome. The general scheme for solving the problem is the same as for problem 1. The difference is that it is necessary to make aUowance for an intermediate interface. We do this by constructing projected traces of the intersections of the ray surfaces with the intermediate interface both before and after its reflection when we are tracing the ray surfaces. Let us examine the tracing of several ray surfaces.

Formula (11) — and so also the intensity of reflected waves above a shot point—do not depend on the transverse velocities in the media under consideration. In formula (3) only one coefficient of reflection depends on the transverse velocity values. When the reflection is from an interface with high acoustic rigidity, it depends mainly on the ratio of transverse to longitudinal velocities in the layer from which the reflection takes place; when the reflection is from an interface with lower acoustic rigidity the coefficient of reflection depends on the transverse velocity values on both sides of the reflecting boundary.

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Applied Geophysics U.S.S.R. by Nicholas Rast


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