Techniques of collecting data from the sea floor by towing a vehicle with SOund NAvigation and Ranging systems projecting beams of sound waves into the underwater environment. Data are collected from the returning echoes (backscatter) as the sound waves are relected back from the sea floor or sediments.
Report on sea floor marks in the Northeast Bering Sea and Chukchi Sea that were identified as pits and furrows caused by whales and walruses in the process of feeding on bottom crustaceans.
U.S. Department of the Interior |
U.S. Geological Survey