Slight north-south bands of noise show where data swaths abut. Image courtesy of Robert C. Tyce, University of Rhode Island. The areas of site study, Sea Beam bathymetry, and municipal sludge dumpsite are outlined. Rectangle shows location of data illustrated below. Airgun seismic-reflection profile along upper continental rise near base of slope shows strata of uppermost rise, slump structures, and faults.
Labeled scarp is shown in higher resolution profile below.
Labeled scarp is crossed by airgun profile above. Arrow marks transition between area of smooth surface to the northeast, and rough, acoustically impenetrable surface, probably of blocky debris-flow deposits to the southwest. Boulders observed during dives of RV Alvin in 1989. Boulders are about 2 m in diameter. Rectangle locates next image.