USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1978-026-FA

Other ID: CI 7-78-2

Status: Completed

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

Funding Program(s):

Location: North Atlantic outer continental shelf and slope, Georges Bank, United States, North America, North Atlantic;

Principal Investigator(s): John M. Aaron

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Seismics: Sparker, Seismics: Sub Bottom Profiler

Scientific Purpose/Goals: Determine location and frequency of mass sediment movement and other geological hazards on the North Atlantic Continental Slope (Georges Bank area) using high-resolution geophysical methods.


Start Date: 1978-09-08

Start Port/Location: Woods Hole, MA

End Date: 1978-09-27

End Port/Location: Woods Hole, MA

Equipment Used: Teledyne single-channel 300-500J 40-tip minisparker, ORE 140 transceiver/1036 transducer sub-bottom profiler, Northstar 6000 LORAN-C, Single channel hydrophone

Information to be Derived: Sea floor map; Morphology;

Summary of Activity and Data Gathered: Overall data quality is excellent, with good resolution and penetration. Some areas of rough topography obscured the underlying structure. Records show slumping and other mass sediment movement occurred at several places on the continental slope adjacent to Georges Bank. Slumping occurs in scales that range from small to large and in styles that range from simple downslope creep to major dislocation. Most slump bodies are found near the base of slope with marked erosional truncations above. Records from the edge of the continental shelf show numerous buried channels of varying size and configuration. Inside the 60 m isobath extensive fields of large sand waves are present. 3.5 kHz: 218 km; Minisparker: 2669 km; Airgun: 2142 km.

Staff: John M. Aaron, Thomas Aldrich, Sandra Conley, Alan Goodman, John C., Jr. Hampson, Kathleen Kent, Richard E. Sylwester

Affiliate Staff:
Charles J. McCreery
James Sullivan; Cecelia Gary - USGS-Reston
Dale Mihalyi - USGS-Corpus Christi

Notes: Original Center People field contained: John Aaron, Ch. Sci.; Richard Sylwester, Alan Goodman, Thomas C. Aldrich, Charles J. McCreery, John Hampson, Sandra Conley, Kathleen Kent, James Sullivan.
Project = North Atlantic OCS Environmental Assessment, North Atlantic OCS Environmental Assessment

Location Map:


photo of Columbus Iselin
Columbus Iselin


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Teledyne single-channel 300-500J 40-tip minisparker --- Sparker
ORE 140 transceiver/1036 transducer sub-bottom profiler --- Sub Bottom Profiler
Northstar 6000 LORAN-C --- Navigation
1978-026-FA-LN-001-01 ( Cruise track chart.)
1978-026-FA-LN-002 ( Digital tapes of NV and NV-NSTAR-FINAL data: inv. # 1757 thru 1760, 1762 thru 1780, and 2809.)
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
1978-026-FA-SE-003 ( analog tape of seismic data)
1978-026-FA-SE-001 ( Collection of paper record displays of seismic data( MSP) for lines )
1978-026-FA-SE-001-01 ( Electronic scans of some paper seismic profiles.)
1978-026-FA-SE-002 ( microfilm of )