Abstract
Bottom reverberation was measured at five locations in the North Atlantic using a hydrophone and explosive charges suspended near the ocean floor. Measured backscattering strengths in the frequency range from 800 Hz to 12.8 kHz show a tendency to rise moderately with frequency. The dependence on grazing angle was found to vary between a sine to the one-half and a sine-squared relation. Measurements made at several depths indicate that a portion of the reverberation originates in the subbottom layer structure directly beneath the point of measurement. At frequencies above 400 Hz, this reverberation from the subbottom appears to contribute significantly only at the steeper grazing angles.
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