Abstract
The times from detonation of a large number of explosive sources to the detection of their acoustic signals at long distances in the Northeast Pacific and North Atlantic oceans have been measured. The sound velocity structure at the former location shows a single, well-defined minimum at approximately 800 m, while at the latter there are minima at approximately 200 and 1200 m. Ray-tracing computations show that the signal travel time as a function of range will have periodic fluctuations about a linear function. The magnitude of the fluctuations is approximately the spacing between the first two multipath arrivals, which is 1 sec for the Pacific and 0.5 sec for the Atlantic. The measurements exhibit the phenomena predicted by the timing computations.
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