Download e-book for kindle: Applied Geophysics U.S.S.R. by Nicholas Rast

By Nicholas Rast

ISBN-10: 008009662X

ISBN-13: 9780080096629

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Example text

We plot the segment Ax from the point a along the direction of incidence of the ray. We now exam­ ine the two points on the projection of the ray which we have thus obtained: 706 and 756 m. At the first point the ray has not yet reached the reflecting boundary, since the 742 m contour passes through this point; at the second point it has intersected the interface since the depth of this point along the 756 m ray is greater than its depth along the 748 m contours. Conse­ quently, the projection of the point of incidence of the ray on to the refle­ cting boundary lies between the points 706 and 756 m along the ray and between the contours 740 and 750 m and is found by interpolating the depths.

Inter­ polating values for the depths between the struature contours 1300 and 14i)0m and also the depths of the section Ax 1300 —1400m, we obtain a point c in which the depths both along the structure contours of the interface and along the ray are the same—1330m. The point c is thus a projection of the trace of intersection of our chosen ray with the interface. Having made such constructions for many rays of the conic surface and having joined the points obtained in a smooth curved line we shall obtain on the plan the trace of intersection between the interface and our ray surface (line 2 in Fig.

Inter­ polating values for the depths between the struature contours 1300 and 14i)0m and also the depths of the section Ax 1300 —1400m, we obtain a point c in which the depths both along the structure contours of the interface and along the ray are the same—1330m. The point c is thus a projection of the trace of intersection of our chosen ray with the interface. Having made such constructions for many rays of the conic surface and having joined the points obtained in a smooth curved line we shall obtain on the plan the trace of intersection between the interface and our ray surface (line 2 in Fig.

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


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