Abstract
FM slide and pulsed-tone signals at 2, 4, 8, and 16 kHz were transmitted from a source to a receiver at the same depth 1100 m distant. Three wholly refracted paths were observed in the return signals, and a discussion of the six-hour time series of the arrival times and amplitudes for each path is presented. Evidence is given of acoustic frequency-dependent scattering, and scattering from oceanic fine structure is suggested as the most likely physical mechanism to explain the observations.
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