Correlation of Some SOFAR Arrivals in the Western North Atlantic

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Abstract
During a sound transmission experiment in the western North Atlantic, background noise was continuously recorded at four stations from hydrophones located on the bottom approximately in the SOFAR channel. Separations between stations were as great as 1100 miles. During the five-day period during which this monitoring was accomplished, forty strong arrivals correlated well between stations and were plotted on a great circle chart by delay time positioning. Four main types of signals were noted in addition to SOFAR shots detonated by Hudson Laboratories for navigational purposes: (1) groups of SOFAR-like pulses with small geographic scatter; (2) isolated short pulses with large geographic scatter; {3) earthquake T-phases; and (4) T-phase arrivals that do not correlate with known earthquakes. It is pointed out that the method of correlating and plotting has applications in navigation, earthquake epicenter location and in the detection of bomb explosions. (This work was sponsored by the Office of Naval Research.)

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