Other ID: ATL2 89-1; 89, Leg 1
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): John Grow
Information Specialist(s): Nancy K. Soderberg
Data Type(s): Seismics: Sub Bottom Profiler, Sampling: Geology, Seismics: Air Gun / Water Gun, Seismics: Boomer, Seismics: Sparker, Electro-Magnetic: Magnetics, Location-Elevation: Navigation
Scientific Purpose/Goals: Conduct a geology and geophysics cruise along the Atlantic continental margin between Virginia and Cape Cod, concentrating on the continental shelf and slope between Virginia and Long Island where high-resolution seismic reflection profiling, vibracoring and bottom samples are needed for Bureau of Land Management (BLM) and USGS environmental impact studies in areas where petroleum lease sales are being considered. Single-channel seismic reflection profiles (airgun), gravity, and magnetics (Legs 1-3) programs for regional geologic resource assessment studies will also be conducted. Leg 1 was designed to obtain eight long geophysical lines across the continental shelf, slope and rise between Virginia and Cape Cod.
Start Date: 1975-04-13
Start Port/Location: Woods Hole, MA
End Date: 1975-04-28
End Port/Location: Woods Hole, MA
Equipment Used: 3.5 kHz, Alpine Vibracorer, Raytheon 3.5 kHz sonar (CESP II) system, Seismic Engineering streamer, Del Norte 26 sparker, Varian V-75 magnetometer, Magnavox satellite positioning system, Loran-C
Information to be Derived:
Summary of Activity and Data Gathered: Collected 8 long geophysical profiles across the margin from the inner continental shelf to the lower continental slope between Virginia and Cape Cod. Systems employed included airgun reflection (single-channel), high-resolution seismics (minisparker, Uniboom and 3.5 kHz sonar), gravity, and a magnetometer. Four of the lines provided potential field and high-resolution seismic data where 24- and 48-channel seismic profiles were available. The other four lines are in locations where the USGS expects to obtain new multichannel lines during 1975 and 1976. Although hampered and delayed by three major storms, the AII was able to complete the planned grid on schedule. 3.5 kHz records: 3,750 km; Gravity profiles: 3,750 km; Magnetic profiles: 3,050 km; Airgun profiles: 2,400 km; Minisparker: 600 km; Uniboom profiles: 50 km.
Staff: John Grow, Thomas Aldrich, Dennis Edwards, Patricia Forrestel, Deborah Hutchinson, Frank W. Jennings, Kathleen Kent, Charles J. O'Hara, Perry Parks, David Twichell
Notes: Original Center People field contained: John Grow - Ch. Sci., Thomas Aldrich - Gravity Systems, Dennis Edwards - Watch Leader, Dick Edwards - Watch Stander, Patty Forrestel - Watch Stander, Debbie Hutchinson - Watch Stander, Frank Jennings - Seismic Electronics, Kathy Kent - Watch Stander, Chuck O'Hara - Watch Leader, Felicity Oram - Watch Stander, Perry Parks - Gravity Electronics, Dave Twichell - Watch Leader.
mid-Atlantic outer continental shelf, Baltimore Canyon trough area, 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.
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.