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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1987-035-FA

Other ID: STRL S6-87-AFR

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): James E. Dodd

Affiliate Investigator(s): Robert Rowland - Reston

Information Specialist(s):

Data Type(s): Electro-Magnetic: Gravity, Sonar: Single Beam, Electro-Magnetic: Magnetics, Location-Elevation: Navigation

Scientific Purpose/Goals: Collect gravity, magnetics and bathymetric data on continental shelf of Liberia, Cote d'Ivoire and Ghana to a 3 nm grid with internal consistency +/-3 mgals.


Start Port/Location: Freetown, Sierra Leone

End Port/Location: Abidjan, Cote dIvoire

Start Date: 1987-08-26

End Date: 1987-09-20

Equipment Used: GPS (wh), 12 kHz, Magnavox satellite positioning system, LaCoste-Romberg gravimeter G-179, Geometrics G-856 magnetometer, Gyro compass, GE 810 Correlation sonar

Information to be Derived:

Summary of Activity and Data Gathered: Departed Freetown 24 Aug. 87; 26 Aug.- 2 Sep., surveyed 973 nm in Liberia; 2-9 Sep., surveyed 1030 nm in Cote d'Ivoire; 9-10 Sep., Abidjan port day; 10-20 Sep., surveyed 1431 nm in Ghana. Returned Abidjan 10 Sep. 87.

Staff: James E. Dodd, Sarah Griscom, Robert Rowland

Affiliate Staff:
Linda Sheetz; Val Zadnik; Samuel Russ - Land
Mines and Energy
24 Aug. - 9 Sep.; Bakary Coulibaly - Ministere de la Marine
Cote d'Ivoire
24 Aug. - 9 Sep.; Samuel Amedofu
Joseph Odemetey - Geological Survey
10 Sep. - 20 Sep.

Notes: Original Center People field contained: Jim Dodd; Bob Rowland - party chief; Sarah Griscom; Linda Sheetz; Val Zadnik.
Project = Defense Mapping Agency Gravity, Defense Mapping Agency Gravity


Liberia, Cote d'Ivoire, Ghana, Africa, North Atlantic;

North: 6.82899 South: -2.63579 West: -13.8032 East: 3.51563


photo of Starella


Folger, D.W., Irwin, Barry J., McCullough, James R., Rowland, Robert W., and Polloni, Christopher F., 1990, Map showing free-air gravity anomalies off the southern coast of west-central Africa; Liberia to Ghana: U.S. Geological Survey Miscellaneous Field Studies Map MF-2098-E, scale 1:1,500,000.


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
LaCoste-Romberg gravimeter G-179 --- Gravity
12 kHz --- Single Beam
1987-035-FA-SE-001 ( Collection of paper record displays of seismic data( 12K) for lines )
Geometrics G-856 magnetometer --- Magnetics
GE 810 Correlation sonar --- Navigation
Gyro compass --- Navigation
GPS (wh) --- Navigation
Magnavox satellite positioning system --- Navigation

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