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Summary for Field Activity Number 1987-029-FA

Alternate Leg ID: STRL S5-87-AFR

Area of Operations: Senegal, Gambia, Guinea-Bissau, Guinea, Sierra Leone, Africa, North Atlantic

Dates: July 22, 1987 to August 20, 1987

Objectives: Collect gravity, magnetics and bathymetric data around Senegal, Gambia, Guinea-Bissau, Guinea, and Sierra Leone to a 3 nm grid with internal consistency +/-3 mgals.

Type of Activity:

Information to be derived:

Summary: Departed Dakar at 1920 on 22 Jul. 1987. The ship proceeded south to survops area. After completing the two remaining lines in Senegal, all runable lines in the waters off The Gambia, Guinea-Bissau, Guinea and Sierra Leone were comleted. Most of the onshore lines run north of Sierra Leone were shortened due to shoals on the eastern ends. Gravimeter S-26 lost its 200 Hz power supply on 2 Aug. 87. The unit was swapped with the unit in meter S-41, which was then shut down. S-26 remained online for the remainder of the cruise and showed no evidence of data tears. Arrived in Freetown, Sierra Leone at 1230 on 20 Aug. 1987.

USGS Project Number: DMA GRAV

Contact: Barry Irwin (

InfoBank: uses the identifier S-5-87-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
04865881889,9922,993900102:17 07/22/198708:20 08/02/1987 12K- 77017743
048665502-5534,660100209:34 08/02/198713:12 08/18/1987 12K- 6629
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