Other ID: CI 7-78-1
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): James M. Robb
Data Type(s): Location-Elevation: Navigation, Seismics: Air Gun / Water Gun, Seismics: Sparker, Seismics: Sub Bottom Profiler, Sonar: Sidescan
Scientific Purpose/Goals: Study slumping or mass movements of sediments on the continental slope using high-resolution geophysical profiling gear.
Start Date: 1978-08-18
Start Port/Location: Miami, FL
End Date: 1978-09-04
End Port/Location: Woods Hole, MA
Equipment Used: Air gun, Teledyne single-channel 300-500J 40-tip minisparker, 3.5 kHz, ORE sidescan, Northstar 6000 LORAN-C, Single channel hydrophone
Information to be Derived: Sea floor map; Morphology;
Summary of Activity and Data Gathered: Slumping and mass downslope sediment movement occurs widely over the continental slope at small scale (small thickness, small displacement) as well as large scale. Individual slump features, although readily identifiable as large masses on individual seismic profiles, may have small lateral extent or may change considerably in their form and location on the slope within the 0.5 nautical mile spacing of our profiles. Continental slope topography cannot be described by dip (offshelf) profiles. Strike (longslope) lines show much rougher topography on the upper continental slope than a series of dip lines would imply. Rough and smooth upper slope topography give the same appearance on dip lines. Sidescan sonar data may show a grain of small (several meter) features paralleling the continental slope. Airgun: 2050 km; Minisparker: 2100 km; 3.5 kHz: 2100 km; Sidescan: 22 km.
Staff: Alan Goodman, John C., Jr. Hampson, Jack Kirby, Valerie Paskevich, James M. Robb, Phil Shea, David Twichell
Notes: Original Center People field contained: Jim Robb - Ch. Sci., Dave Twichell, John Hampson, Peter Stinger, Valerie Paskevich, Patricia Brady, Timothy Bishop, Phillip Shea, Gerard McCarthy, Nicholas Lefteriou, Alan Goodman, John Kirby.
Mid-Atlantic outer continental shelf and slope, United States, North America, North Atlantic;
Chaytor, J.D., ten Brink, Uri S., Solow, Andrew R., and Andrews, Brian D., 2009, Size distribution of submarine landslides along the U.S. Atlantic margin: Marine Geology, v. 264 no. 1-2, doi: 10.1016/j.margeo.2008.08.007.
Geist, E.L., Lynett, Patrick J., and Chaytor, Jason D., 2009, Hydrodynamic modeling of tsunamis from the Currituck landslide: Marine Geology, v. 264 no. 1-2, doi: 10.1016/j.margeo.2008.09.005.
Robb, J.M., 1980, High-resolution seismic-reflection profiles collected by the R/V COLUMBUS ISELIN, Cruise CI 7807-1, in the Baltimore Canyon Outer Continental Shelf area, offshore New Jersey: 3, download PDF.
ten Brink, U.S., Barkan, R., Andrews, B.D., and Chaytor, J.D., 2009, Size distributions and failure initiation of submarine and subaerial landslides: Earth and Planetary Science Letters, v. 287 no. 1-2, doi: 10.1016/j.epsl.2009.07.031.
Twichell, D.C., Chaytor, Jason D., ten Brink, Uri S., and Buczkowski, Brian, 2009, Morphology of late Quaternary submarine landslides along the U.S. Atlantic continental margin: Marine Geology, v. 264 no. 1-2, doi: 10.1016/j.margeo.2009.01.009.