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Summary Information for Field Activity 1977-021-FA

Area of Operations: Baltimore Canyon, Wilmington Canyon, Hudson Canyon, U.S. Mid-Atlantic Continental Shelf, New Jersey, Virginia, United States, North America, North Atlantic

Dates: June 08, 1977 to June 14, 1977

Chief scientist: Dave Twichell

Objectives: Conduct a high-resolution sub-bottom and sidescan sonar survey of sandwaves and bedforms indicative of significant sediment movement at 4 locations on the U.S. mid-Atlantic shelf and 3 surveys at the heads of Baltimore, Wilmington and Hudson Canyons.

Type of Activity: Seismic profiling; Sea floor mapping;Sea floor mapping

Information to be derived: Sea floor map; Morphology;

Summary: Results obtained were good. After a brief and incomplete analysis of the records it seems unlikely, with the exception of the Wilmington Canyon area, that any of the survey areas have well developed sand waves in them. Off Delaware Bay a number of patches of different textured sea floor were crossed, and in other areas ripples were apparent on the sidescan records. Ripples were by no means continuous over the entire shelf. A man-made feature seen extensively on the shelf surface was trawl markings. Sub-bottom profiles: 699 km; Sidescan sonar: 711 km; Uniboom: 478 km.

Contact: Dave Twichell (

InfoBank: uses the identifier O-27-77-MC. Visit this site for more information.

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Platform Info:

Publications resulting from these data

Twichell, David C.,1979, Notes on the availability of single-channel seismic-reflection profiles and side-scan sonar records collected during June 8-14, 1977 in the Middle Atlantic Shelf area: U.S. Geological Survey Open-File Report 79-580, 5 p.. (Available as a PDF version)

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