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Summary Information for Field Activity 1987-040-FA

Area of Operations: Ghana, Togo, Benin, Nigeria, Cameroon, Gabon, Equatorial Guinea, Africa, North Atlantic, South Atlantic

Dates: September 24, 1987 to October 20, 1987

Chief scientist: George Driscoll

Objectives: Collect gravity, magnetics and bathymetric data off the west coast of Africa on a 5 nmi grid with an internal consistency of +/- 3 milligals.

Type of Activity: Geophysical survey;Geophysical survey

Information to be derived:

Summary: 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.

Contact: George Driscoll (

InfoBank: uses the identifier S-7-87-AF. Visit this site for more information.

Related Links:

Platform Info:

Publications resulting from these data

Folger, David 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: U.S. Geological Survey Miscellaneous Field Studies Map MF-2098-F, scale 1:1,500,000. (Available as a PDF version)

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Data Types and Locations:


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