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- W1974667244 abstract "Sonobuoy arrays located over the Mid-Atlantic Ridge have been used to measure the spatial coherence of sound radiated from sea quakes. These measurements were made with array elements separated by several kilometers and tracked to an accuracy of 20 m. Spatial coherence, defined as the normalized, cross-power spectral density, has been found to be as high as 0.7 at 14 Hz, to be typically about 0.5 between 16 and 60 Hz, and to drop sharply to zero above 60 Hz. Short-range events, distinguished by time delays of the order of 0.1 sec across the array and by a rapid onset of the pulse, are presumed to leave the bottom at sharp angles. These events are significantly more coherent than long-range events that have little time delay across the aperture and whose onset is smeared out in time. Long-range events are presumed to exit from the bottom at shallow angles. Significant processing gain is possible using high-resolution spectral analysis. Improvements over the conventional delay and sum processor of as much as five to one have been observed. The resolving power obtained with these sonobuoy arrays is consistent with measured spatial coherence." @default.
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- W1974667244 date "1975-04-01" @default.
- W1974667244 modified "2023-09-23" @default.
- W1974667244 title "Spatial coherence of sound radiated from sea quakes near the Mid‐Atlantic Ridge" @default.
- W1974667244 doi "https://doi.org/10.1121/1.1995165" @default.
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