Abstract
The ocean floor exhibits a wide variety of geological characteristics that can affect incident acoustic radiation. Therefore, in order fully to understand and use any acoustic-backscatter measurements, it is necessary to obtain as much information as possible about the characteristics at the location of the measurements. Measurements have been made of the acoustic backscatters as a function of grazing angle at a location on the Blake Plateau, using an acoustic frequency of 1.78 kHz. For grazing angles below 65°, the scattering strengths are significantly lower than some data previously obtained at the same site using a frequency of 19.5 kHz. A number of bottom photographs and a seismic-refraction profile were obtained in close proximity to the location of the acoustic measurements. A number of photographs and a bottom sample have also been obtained on Challenger Bank, the location of some 2.5-kHz backscatter measurements.
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