USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1987-019-FA

Other ID: S3-87-CI

Status: Completed

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

Funding Program(s):

Location: Canary Islands, Africa, North Atlantic;

Principal Investigator(s): William J. Strahle, James E. Dodd

Affiliate Investigator(s):

Information Specialist(s): William J. Strahle, James E. Dodd

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

Scientific Purpose/Goals: Collect gravity and bathymetry data around the Canary Islands on a 3 nm grid with internal consistency of +/-3 mgals, while tying GE 810 correlation sonar into the Magnavox 5000 integrated navigation system and the USGS data collection system.

Vehicle(s):

Start Date: 1987-05-12

Start Port/Location: Las Palmas, Canary Islands

End Date: 1987-06-11

End Port/Location: Las Palmas, Canary Islands

Equipment Used: Racal/Decca Hyperfix, LaCoste-Romberg gravimeter G-179, Echosounder, Magnavox System 5000 integrated navigation system

Information to be Derived:

Summary of Activity and Data Gathered: The ship left Las Palmas, Gran Canaria Island, May 12, 1987, heading for Fuerteventura. Starting on the southern coast working east and north toward Lanzarote Island, we surveyed around Lanzarote then exchanged some crew members in Las Palmas. We ran one long line southwest along the west coast of Fuerteventura on the transit to Las Palmas, making the party exchange on May 18. Racal had a limited number of navigation stations and each station had limited range (15-20 nmi for Microfix, 150 nmi for Hyperfix), therefore the sea survey had to be coordinated with land resources. While data are normally processed every few days, the data were processed before leaving the area to eliminate the need to return and to allow the Racal navigation stations to be moved to the next area. On May 23rd, the east side of Gran Canaria Island was surveyed and scientific party was exchanged at Las Palmas. The survey then continued around Gran Canaria and the western islands of Tenerife, Gomera, Hierro, and La Palma. The cruise ended in Las Palmas on June 11, 1987, where the gravity data was referenced to the gravity station in Las Palmas.

Staff: Barry Irwin, William J. Strahle, Ronald C. Circe, Catherine Delorey, Carol A. Ryland, Candy Bostwick, James E. Dodd, Noemi Rosado

Affiliate Staff:
Jim McCullough - WHOI; John Haaglund - Nortech; John Ryland - Racal Survey

Notes: Original Center People field contained: James Dodd - co-Chief Scientist; William Strahle - co-Chief Scientist; Catherine Delorey; Candy Lane; Carol Renaud; Noemi Rosado; Barry Irwin; Ronald Circe.
Project = Defense Mapping Agency Gravity, Defense Mapping Agency Gravity

Location Map:

Platform(s):

photo of Starella
Starella

Publications

Folger, D.W., McCullough, James R., Irwin, Barry J., Dodd, James E., Strahle, William J., Polloni, Christopher F., and Bouse, Robin M., 1990, Map showing free-air gravity anomalies around the Canary Islands, Spain: URL: http://woodshole.er.usgs.gov/publications/folger/1990/86674_Folger1990.pdf, download PDF.

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Racal/Decca Hyperfix --- Navigation
LaCoste-Romberg gravimeter G-179 --- Gravity
1987-019-FA-GP-001 ( Digital tape(s) of NV/GRAV ARCHIVE, PROCESSED GRAV, )
Echosounder --- Single Beam
1987-019-FA-SE-001 ( Collection of paper record displays of seismic data( 12K) for lines )
Magnavox System 5000 integrated navigation system --- Navigation
1987-019-FA-LN-001 ( Digital tape(s) of NV/GRAV ARCHIVE, PROCESSED GRAV, )