Other ID: STRL S7-87-AFR
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Ghana, Togo, Benin, Nigeria, Cameroon, Gabon, Equatorial Guinea, Africa, North Atlantic, South Atlantic;
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, magnetics and bathymetric data off the west coast of Africa on a 5 nmi grid with an internal consistency of +/- 3 milligals.
Start Date: 1987-09-24
Start Port/Location: Abidjan, Cote d'Ivoire
End Date: 1987-10-20
End Port/Location: Douala, Cameroon
Equipment Used: LaCoste-Romberg gravimeter G-179, 12 kHz, Geometrics G-856 magnetometer, GE 810 Correlation sonar, Gyro compass, GPS (wh)
Information to be Derived:
Summary of Activity and Data Gathered: Departed Abidjan, Ivory Coast on 24 Sep. On 25 Sep., resurveyed 2 Ghana lines due to high cross checks. On 26 Sep., surveyed 1 Togo line and 1 Benin line and started Nigeria survey. On 5 Oct., completed Nigeria and began Cameroon survey. On 8 Oct., completed Cameroon survey and began Gabon survey. 18 Oct., transit to Douala. 20 Oct., arrived Douala, Cameroon for crew change and provisions. The 810 Sonar/MK 29 Gyro system worked flawlessly as did gravimeters and all gravity processing equipment and software. Many lines had to be cut short on the eastern end due to shoals, or shifted due to restricted oil platform areas.
Staff: Nancy K. Soderberg, Catherine Delorey, George R. Driscoll
Folger, D.W., McCullough, James R., Irwin, Barry J., Driscoll, George R., Delorey, Catherine M., and Polloni, Christopher F., 1990, Map showing free-air gravity anomalies off the western coast of Africa; Nigeria to Gabon: , download PDF.