Other ID: CI 7-78-2
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: North Atlantic outer continental shelf and slope, Georges Bank, United States, North America, North Atlantic;
Principal Investigator(s): John M. Aaron
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
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.