USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1975-002-FA

Other ID: ATL2 89-1; 89, Leg 1

Status: Completed

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

Funding Program(s):

Location: mid-Atlantic outer continental shelf, Baltimore Canyon trough area, United States, North America, North Atlantic;

Principal Investigator(s): John Grow

Affiliate Investigator(s):

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.

Vehicle(s):

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

Affiliate Staff:
Dick Edwards - Watch Stander
Felicity Oram - Watch Stander; USGS-Reston: Harold Krivoy - Watch Stander; WHOI: Steve Gegg - Computer Processor
Gus Tollios - Computer Hardware

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.
Project = Geophysics of the Atlantic Outer Continental Shelf, Geophysics of the Atlantic Outer Continental Shelf

Location Map:

Platform(s):

photo of Atlantis II
Atlantis II

Publications

(Gravity)

(Magnetics)

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
3.5 kHz --- Sub Bottom Profiler
1975-002-FA-BA-001 ( Digital tape(s) of GR, NV, SEIS, NV,GR,BT,MG, NV,BT,MG, GR-O/P FTCOPY, )
Alpine Vibracorer --- Geology
Raytheon 3.5 kHz sonar (CESP II) system --- Sub Bottom Profiler
Seismic Engineering streamer --- Air Gun / Water Gun
Boomer
Sparker
Del Norte 26 sparker --- Sparker
1975-002-FA-SE-001 ( Collection of paper record displays of seismic data( AIR) for lines )
1975-002-FA-SE-002 ( microfilm of )
1975-002-FA-SE-003 ( analog tape of seismic data)
1975-002-FA-SE-004 ( Digital tape(s) of GR, NV, SEIS, NV,GR,BT,MG, NV,BT,MG, GR-O/P FTCOPY, )
Varian V-75 magnetometer --- Magnetics
1975-002-FA-GP-001-01 ( Magnetic and gravity data recovered from 9 track tape)
Magnavox satellite positioning system --- Navigation
Loran-C --- Navigation
1975-002-FA-LN-002 ( Digital tape(s) of GR, NV, SEIS, NV,GR,BT,MG, NV,BT,MG, GR-O/P FTCOPY, )
1975-002-FA-LN-001-02 ( Field Track Map for ATL2 89 Leg 1 (pdf file) Field track map with irregular ticks.)
1975-002-FA-LN-001-01 ( Track Map for ATL2 89 Legs 1, 2 and 3 (pdf file) Drafted airgun track map with line numbers and hourly ticks for ATL2 89 Legs 1, 2 and 3.)
1975-002-FA-LN-001-03 ( Trackmap for ATL2 89 Legs 1, 2 and 3 with dates and hour marks: .pdf format.)
1975-002-FA-LN-001-04 ( Trackmap for ATL2 89 Leg 1 with dates and hour marks: .pdf format; Inv. # TK00015.)