Abstract
Observations with the GLORIA sonar in coastal waters have shown regular patterns in the reverberation. These are interpreted as due to the interference between the first two normal modes, having characteristics similar to those in the surface duct, but with insonification below the thermocline. Up to four peaks have been seen at a spacing of about 3 km, in good agreement with expectation for the 6.4-kHz frequency. The main scatterers appear to be shallow biological targets such as fish, probably located close to the thermocline.
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