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Abstract

We are now in a position to direct our attention specifically to seismology. Let SS again represent the trace of the plane surface of the earth. Until we are in a position to deal with low-velocity, uphole, elevation and other corrections, we shall assume ideal conditions, among which will be the supposition that the medium immediately below the surface is one for which the velocity is υ, a constant, in all directions. The shot-point, too, is assumed to be at the surface.

Immediately succeeding the shot-point explosion, seismic waves are excited which, by virtue of our assumptions, spread out equally in all directions in the earth. Consider the successive positions of the foremost wave front. It has the form of an expanding hemisphere concentric with the shot-point, whose radius is increasing at a rate equal to the velocity v.

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