| Identifier | 1975-002-FA | ||||||||
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| Alternate names | ATL2 89-1; 89, Leg 1 | ||||||||
| Purpose | 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. | ||||||||
| Location | mid-Atlantic outer continental shelf, Baltimore Canyon trough area, United States, North America, North Atlantic; | ||||||||
| Summary | 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. | ||||||||
| Comments | 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 | ||||||||
| Related activities |
1975-003-FA: Cruise legs
1975-006-FA: Cruise legs
1975-009-FA: Cruise legs
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| Bounds |
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| Organization |
384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
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| Principal investigators | John Grow | ||||||||||||||||||||
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| 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 |
| Data category: | Seismics, Sampling, Electro-Magnetic, Location-Elevation |
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| Data type: | Sub Bottom Profiler, Geology, Air Gun / Water Gun, Boomer, Sparker, Magnetics, Navigation |
| Equipment | Usage description | Data types | Datasets |
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| Boomer | Boomer | (no data reported) | |
| 3.5 kHz | Sub Bottom Profiler | 1 | |
| Alpine Vibracorer | Geology | (no data reported) | |
| Raytheon 3.5 kHz sonar (CESP II) system | Sub Bottom Profiler | (no data reported) | |
| Seismic Engineering streamer | Air Gun / Water Gun, Boomer, Sparker | 4 | |
| Del Norte 26 sparker | Sparker | (no data reported) | |
| Varian V-75 magnetometer | Magnetics | 1 | |
| Magnavox satellite positioning system | Navigation | (no data reported) | |
| Loran-C | Navigation | 6 |
| Dataset name | Equipment | Description | Dataset contact |
|---|---|---|---|
| 1975-002-FA-BA-001 | 3.5 kHz | Digital tape(s) of GR, NV, SEIS, NV,GR,BT,MG, NV,BT,MG, GR-O/P FTCOPY, | Nancy K. Soderberg |
| 1975-002-FA-SE-001 | Seismic Engineering streamer | Collection of paper record displays of seismic data( AIR) for lines Paper records exist for sparker, boomer, 3.5 kHZ, and AirGun. Check data library records. | Nancy K. Soderberg |
| 1975-002-FA-SE-002 | Seismic Engineering streamer | microfilm of (?not sure which seismic system, but assume it is all of them) **FIX** | Nancy K. Soderberg |
| 1975-002-FA-SE-003 | Seismic Engineering streamer | analog tape of seismic data (not sure which seismic system) **FIX** | Nancy K. Soderberg |
| 1975-002-FA-SE-004 | Seismic Engineering streamer | Digital tape(s) of GR, NV, SEIS, NV,GR,BT,MG, NV,BT,MG, GR-O/P FTCOPY, | Nancy K. Soderberg |
| 1975-002-FA-GP-001-01 | Varian V-75 magnetometer | Magnetic and gravity data recovered from 9 track tape | Nancy K. Soderberg |
| 1975-002-FA-LN-001 | Loran-C | Navigation trackline plot for field activity 75002 | Nancy K. Soderberg |
| 1975-002-FA-LN-001-01 | Loran-C | 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. | Nancy K. Soderberg |
| 1975-002-FA-LN-001-02 | Loran-C | Field Track Map for ATL2 89 Leg 1 (pdf file) Field track map with irregular ticks. | Nancy K. Soderberg |
| 1975-002-FA-LN-001-03 | Loran-C | Trackmap for ATL2 89 Legs 1, 2 and 3 with dates and hour marks: .pdf format. | Alice M. Orton |
| 1975-002-FA-LN-001-04 | Loran-C | Trackmap for ATL2 89 Leg 1 with dates and hour marks: .pdf format; Inv. # TK00015. | Alice M. Orton |
| 1975-002-FA-LN-002 | Loran-C | Digital tape(s) of GR, NV, SEIS, NV,GR,BT,MG, NV,BT,MG, GR-O/P FTCOPY, | Nancy K. Soderberg |
