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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1977-021-FA

Other ID: OC 27

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Seismics: Boomer, Seismics: Sub Bottom Profiler, Sonar: Sidescan

Scientific Purpose/Goals: 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.


Start Port/Location: Woods Hole, MA

End Port/Location: Woods Hole, MA

Start Date: 1977-06-08

End Date: 1977-06-14

Equipment Used: Single channel hydrophone, ORE 140 transceiver/1036 transducer sub-bottom profiler, EG&G 234, ORE sidescan, Loran-C

Information to be Derived: Sea floor map; Morphology;

Summary of Activity and Data Gathered: 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.

Staff: Diane M. Eskenasy, Alan Goodman, Deborah Hutchinson, Charles Paull, Stephanie Pfirman, David Twichell

Affiliate Staff:
Timothy Bishop
Nicholas Lefteriou
Gerard McCarthy; John Cowles - tech.

Notes: Original Center People field contained: Dave Twichell - Chief Scientist, Timothy Bishop, Diane Eskenasy, Alan Goodman, Debbie Hutchinson, Nicholas Lefteriou, Gerard McCarthy, Charles Paull, Stephanie Pfirman.


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

North: 39.5 South: 37.95 West: -75 East: -72


photo of Oceanus


Twichell, D.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..


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
ORE 140 transceiver/1036 transducer sub-bottom profiler --- Sub Bottom Profiler
1977-021-FA-SE-002 ( microfilm of SUBBOTTOM SURVEY 1-6 LINES 1-10)
1977-021-FA-SE-001 ( Collection of paper record displays of seismic data( 3.5K) for lines )
ORE sidescan --- Sidescan
1977-021-FA-SO-001 ( microfilm of SUBBOTTOM SURVEY 1-6 LINES 1-10)
EG&G 234 --- Boomer
Loran-C --- Navigation
1977-021-FA-LN-002-01 ( Navigation data)
1977-021-FA-LN-001 ( Navigation trackline plot for field activity 77021)
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler

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