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Published online by Cambridge University Press: 30 January 2017
The 1976/77 Norwegian Antarctic Research Expedition carried out studies of the sea bed by side-scan sonar. The equipment was operated from the expedition vessel down to about 350 m depth by personnel from the Continental Shelf Institute, Trondheim. Various types of plough marks mostly ranging from 10 to 100 m in width were observed. These included several generations of crossing plough marks as well as plough marks with abrupt changes in trend reflecting changing iceberg motion. The investigations will be expanded during the 1978/79 expedition to include towing at greater depths, and mapping of sea-bed morphology by mosaic towing patterns.
D. E. Thompson: What is the size of your side-scan swath before resolution is lost?
O. Orheim: Typically we were scanning from 50–100 m above the sea bed giving good resolution imagery of the bed over a 300 m wide swath to each side.
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