By Nicholas Rast
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Extra resources for Applied Geophysics U.S.S.R.
We plot the section once again and obtain a point marked 1400m but the structure contour 1340m passes through this point on the plan and consequently our ray has not yet intersected the interface between the contours 1300 and 14iK)m. 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.
It has been noted in many works that the head waves excited at boundaries where there is a considerable discontinuity in the velocities are less intense than waves formed at boundaries which Ue higher and in wliich the difference in velocities is slight <^'^). Our inference that intense head waves, excited at weak interfaces do exist therefore agrees with experimental data. (d) According to the theory head waves suffer damping with distance as r"*/« (r—Γο)~/« and at greater distances r, as f^. But at distances r = lOr^ the replacement of (r—ΓΟ)~*^· by r"^ leads to an error of 15%.
Since the interface is not simple in form we shall find the projection of the trace of intersection of the ray * For the sake of brevity we shall henceforward call such a surface the **φ° ray surface". 56 Ε . I. GAL'PERÍN et al. 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.
Applied Geophysics U.S.S.R. by Nicholas Rast