Other ID: STRL S4-87-AFR
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): George R. Driscoll
Information Specialist(s): George R. Driscoll
Data Type(s): Electro-Magnetic: Gravity, Sonar: Single Beam, Electro-Magnetic: Magnetics, Location-Elevation: Navigation
Scientific Purpose/Goals: Collect gravity and bathymetric data offshore W. Sahara, Mauritania and Senegal on a 3 nm grid with internal consistency +/-3 mgals. The GE 810 correlation sonar was tested around Gran Canaria during the first part of the cruise.
Start Port/Location: Las Palmas, Canary Islands
End Port/Location: Dakar, Senegal
Start Date: 1987-06-12
End Date: 1987-07-17
Equipment Used: LaCoste-Romberg gravimeter G-179, 12 kHz, Geometrics G-856 magnetometer, GE 810 Correlation sonar, Gyro compass, GPS (wh), Magnavox satellite positioning system
Information to be Derived:
Summary of Activity and Data Gathered: Departed Las Palmas, Gran Canaria 12 June 1987 to test General Electric 810 Correlation Sonar along the coast of Western Sahara. On 19 June returned to Las Palmas to offload test personnel and resumed survey along offshore Western Sahara. Survey continued off Mauritania and Senegal. The 810 Sonar/MK 29 Gyro system worked flawlessly. Most lines were cut short on the eastern end due to shoals.
Staff: Barry Irwin, Nancy K. Soderberg, William J. Strahle, Ronald C. Circe, Lester D. North, George R. Driscoll
Bob Bowles (6/26 - 7/18); Jim McCullough - WHOI (6/12-18); William Bookheimer - General Electric (6/12-18); Amadou T. Diaw - U. Senegal
Notes: Original Center People field contained: George Driscoll, party chief (6/12 - 7/18); Barry Irwin (6/12-24); Ron Circe (6/12-24); Bill Strahle (6/12-18); Nancy Soderberg (6/26 - 7/18); Lester North (6/26 - 7/18).
Project = Defense Mapping Agency Gravity, Defense Mapping Agency Gravity
Canary Islands, Western Sahara, Mauritania, Senegal, Africa, North Atlantic;
|North: 26||South: 13||West: -17.5||East: -15|
Folger, D.W., Irwin, Barry J., McCullough, James R., Driscoll, George R., and Polloni, Christopher F., 1990, Map showing free-air gravity anomalies off the western coast of Africa; Western Sahara to Senegal (north of 15 degrees north latitude): U.S. Geological Survey Miscellaneous Field Studies Map MF-2098-C, scale 1:1,500,000.
|Survey Equipment||Survey Info||Data Type(s)||Data Collected|
|LaCoste-Romberg gravimeter G-179||---||Gravity|
|12 kHz||---||Single Beam||1987-022-FA-SE-001 ( Collection of paper record displays of seismic data( 12K) for lines )|
|Geometrics G-856 magnetometer||---||Magnetics|
|GE 810 Correlation sonar||---||Navigation|
|Magnavox satellite positioning system||---||Navigation|