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Summary Information for Field Activity 1987-009-FA

Area of Operations: Cape Verde Islands, Africa, North Atlantic

Dates: March 26, 1987 to April 25, 1987

Chief scientist: Jim Dodd

Objectives: Collect gravity and bathymetry data around the Cape Verde Islands.

Type of Activity: Geophysical survey;Geophysical survey.

Information to be derived: Gravity and bathymetry data

Summary: The ship left Mindelo (Sao Vicente Island, Cape Verde Islands) on March 26, 1987. Two lines from Leg 1 were re-run using GPS navigation because all Racal shore-based navigation had been moved to the eastern and southern Cape Verde Islands. On March 27th, operations moved to Sal Island where Racal Survey had their radio navigation net set up. After a one-hour calibration, the survey was continued. We had to coordinate the survey at sea with the resources on land. While data are normally processed every few days, here the schedule was increased so that as soon as an area was surveyed the data from that area were processed so we could be sure we wouldn't have to return there. This leap-frogging system was made possible through the hard work of the Racal shore team and the help of many of the local Cape Verdeans. We moved south, surveying around the islands of Sal, Boa Vista, Maio, and Sao Tiago. There was a two-day port stop in Praia to exchange some of the crew from April 9-11. The cruise finished up the area around Sao Tiago and then moved on to survey around the islands of Fogo and Brava. After completing the survey, the ship docked in Praia (Sao Tiago) on April 25 to tie the gravity data to the gravity station there.

Contact: Jim Dodd ()

InfoBank: uses the identifier S-2-87-AF. Visit this site for more information.

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Platform Info:

Publications resulting from these data

Folger, David W., Irwin, Barry J., McCullough, James R., Bouse, Robin M., Polloni, Christopher F., Dodd, James E., and O'Brien, T. F.,1990, Map showing free-air gravity anomalies around the Cape Verde Islands: U.S. Geological Survey Miscellaneous Field Studies Map MF-2098-A, scale 1:750,000. (Available as a PDF version)

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