Abstract
Dispersed high-order modes have been observed at frequencies as high as 300 Hz and at ranges of 600 km for shots detonated and received on the axis of a SOFAR channel located in the western Mediterranean Sea. Spectrum analysis of shot records has revealed as many as five identifiable group-velocity profiles that correlate with modes as high as 70. Accurate prediction of observed group-velocity profiles is obtained by applying WKB mode theory to sound-velocity data. In addition, dispersion of individual resolved multipath arrivals, for which low frequencies tend to arrive later, is observed and analyzed by a modified ray theory including diffraction effects.
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