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Summary for Field Activity Number 1987-040-FA

Alternate Leg ID: STRL S7-87-AFR

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

Dates: September 24, 1987 to October 20, 1987

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

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.

USGS Project Number: DMA GRAV

Contact: George Driscoll (

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

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
photo of STARELLA

The following materials for this field activity are available in the Information Archives:

Paper seismic/sidescan bottom profiles:

Inventory #LinesFolderStart TimeEnd TimeProfile TypeRemarks
04869133,97,98,990200116:20 09/23/198719:05 10/06/1987 12K-
0487015900220:19 10/06/198710:39 10/18/1987 12K-
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