USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1971-006-FA

Other ID: UGEO Leg 6; CORPUS 21

Status: Completed

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

Funding Program(s):

Location: transatlantic westward crossing, Liberia, Africa, Sierra Leone Rise, Vema Fracture Zone, mid-Atlantic Ridge, JOIDES 13,26,27, Charlotte Amalie, St. Thomas, U.S. Virgin Islands, Lesser Antilles, North Atlantic;

Principal Investigator(s): Martin F. Kane

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Electro-Magnetic: Gravity, Electro-Magnetic: Magnetics, Location-Elevation: Navigation, Seismics: Sonobouy, Seismics: Sparker, Seismics: Sub Bottom Profiler

Scientific Purpose/Goals: Objectives of this cruise were: (a) to investigate the acoustic reflection characteristics of the mid-Atlantic ridge and other oceanic structures such as the Vema fracture zone and the Sierra Leone rise; (b) to correlate data from JOIDES drill holes with sub-bottom acoustic reflection profiles in oceanic areas; and (c) to extend our knowledge of sediment distribution and thickness in the deep ocean.

Vehicle(s):

Start Date: 1971-11-24

Start Port/Location: Monrovia, Liberia

End Date: 1971-12-10

End Port/Location: Charlotte Amalie, St. Thomas, U.S. Virgin Islands

Equipment Used: 3.5 kHz, Sparker system, LaCoste-Romberg gravimeter G-179, Varian V-75 magnetometer, Seismic refraction, ITT 4007 satellite navigation, Decca radar system, Single channel hydrophone

Information to be Derived: Suspended sediment concentrations; Bathymetric maps; Magnetic intensity and gravity; Sub-bottom acoustic reflection profiles;

Summary of Activity and Data Gathered: The major result so far is that various geophysical data including continuous gravity, magnetics, and seismic reflection profiles and 18 seismic refraction and wide angle reflection (sonobuoy) profiles have been successfully recorded over a number of features. Gravity and magnetics records will require computer processing to be usable. Survey lines: 1, 2, 3, 4, 5, 6, 7, and 7A.

Staff: Frank W. Jennings, Martin F. Kane, Charles J. O'Hara, James M. Robb

Affiliate Staff:
USGS-Menlo Park: Harry Hill (Electronic Technician)
James Nicholson (Electronic Technician)
William Todd (Physical Science Technician); USGS-Denver: Gerald Evenden (Geophysicist); United Geophysical Corp. (Pasadena
CA): Trevor Hill (navigation tech.)

Notes: Original Center People field contained: Martin F. Kane (Chief Sci.), Jim Robb (Geologist), Chuck O'Hara (Geologist), Frank W. Jennings (Electronic Technician).
Project = International Decade of Ocean Exploration (IDOE), International Decade of Ocean Exploration (IDOE)

Location Map:

Platform(s):

photo of United Geo I
United Geo I

Publications

(Bathymetry) Steele, Wm. Clinton, Degnan, Carolyn H., Deeter, Gary B., and Riordan, Jean A., 1989, Description of marine geophysical data collected by the U.S. Geological Survey and how to obtain it: U.S. Geological Survey Open-File Report 89-167, 26 p.

(Magnetics) Steele, Wm. Clinton, Degnan, Carolyn H., Deeter, Gary B., and Riordan, Jean A., 1989, Description of marine geophysical data collected by the U.S. Geological Survey and how to obtain it: U.S. Geological Survey Open-File Report 89-167, 26 p.

(Gravity) Steele, Wm. Clinton, Degnan, Carolyn H., Deeter, Gary B., and Riordan, Jean A., 1989, Description of marine geophysical data collected by the U.S. Geological Survey and how to obtain it: U.S. Geological Survey Open-File Report 89-167, 26 p.

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
3.5 kHz --- Sub Bottom Profiler
1971-006-FA-BA-001 ( Bathymetry data in InfoBank)
Sparker system --- Sparker
LaCoste-Romberg gravimeter G-179 --- Gravity
1971-006-FA-GP-002 ( Gravity in InfoBank)
Varian V-75 magnetometer --- Magnetics
1971-006-FA-GP-001 ( Magnetics in InfoBank)
Seismic refraction --- Sonobouy
ITT 4007 satellite navigation --- Navigation
1971-006-FA-LN-002 ( Navigation data in InfoBank)
1971-006-FA-LN-001-01 ( Trackline chart with line numbers and times.)
Decca radar system --- Navigation
Single channel hydrophone --- Air Gun / Water Gun
Boomer
Bubble Gun
Sparker
Sub Bottom Profiler
1971-006-FA-SE-001 ( Collection of paper record displays of seismic data( SONO) for lines )
1971-006-FA-SE-002 ( microfilm of )