Abstract
Previous long range acoustic experiments show that the Mid‐Atlantic Ridge, a major topographic feature rising to the deep sound channel axis, can have a significant effect on SOFAR propagation. [R. J. Urick, J. Acoust. Soc. Am. 35, 1413 (1963)]. In order to quantify this effect, data has been analyzed from a recent SOFAR experiment which deployed SUS charges during several transits across the Ridge. The signals were received on a hydrophone located near Bermuda, a distance of approximately 2500 km. These results are compared with data from Atlantic seamounts of similar height and ridges in other oceans. [K. M. Guthrie, J. Acoust. Soc. Am. Suppl. 1 68, S52(A) (1980)]. The enhancement or shadowing of SOFAR propagation is presented as a function of source depth and frequency for various geometries. [Work supported by NAVSEA.]
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