Abstract
A method is presented whereby, through the use of the direct water wave first arrival from a shot fired on the ocean bottom, and the first and second reflections of sound from the surface of the sea, the following data may be obtained: (1) the ratio of the depth of the shot below the surface of the sea to the lateral distance between the shot and detector; (2) the lateral distance between the shot and the detector at the bottom of the sea; and finally, (3) the time of detonation or the time break in terms of the time scale of the detecting recorder. The velocity of sound in sea water shows a linear variation of the velocity with depth in definite zones with rather abrupt changes in slope of the velocity‐depth curve from zone to zone. Curvature due to refraction is found to be negligible in the calculations made for true oceanic depths. Sample computations are given.
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