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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1971-003-FA

Other ID: UGEO Leg 3; CORPUS 17/18, U-03-71-CB, U0171CB

Status: Completed

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

Funding Program(s):

Principal Investigator(s): Louis E. Garrison

Affiliate Investigator(s):

Information Specialist(s):

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

Scientific Purpose/Goals: Scientific objectives of this cruise leg were: (1) to investigate the zone of juncture between the south flank of the Antillean ridge and the north edge of the Venezuelan Basin along the depressed Muertos Trough; (2) to examine structural deformation in the Anegada Trough where the Greater Antilles are joined by the Lesser Antilles and Aves Swell; and (3) to study the northeastern sector of the Puetro Rico Trench where predicted relative plate motion should be transitional between westward underthrusting of the Lesser Antilles and east-west strike-slip motion north of the Greater Antilles.


Start Port/Location: San Juan, Puerto Rico

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

Start Date: 1971-07-15

End Date: 1971-08-04

Equipment Used: 3.5 kHz, Sparker , Single channel hydrophone, Magnetometer (wh), Gravity meter (wh), Dredge, Decca radar system, ITT 4007 satellite navigation

Information to be Derived:

Summary of Activity and Data Gathered: Sub-bottom acoustic profiles were obtained over about 5,840 km of track line in the project area. One dredging station was occupied and three sonobuoy refraction profiles made. Total geophysical track miles: 3,028 (5,840 km); Time Log: #17a; Seismic Log: #17b; Gravity Log: #17c; Bathymetry Log: #17d; and Daily Log: #17e.

Staff: James V. A. Trumbull, Ray G., Jr. Martin, Louis E. Garrison

Affiliate Staff:
PMG - Mike Marlow
Allan Cooper
Robert Immel
Bob Patrick
Martin Hijmans
Trevor Hill

Notes: Data holdings at PCMSC.
Original Center People field contained: Louis Garrison - Chief Scientist, James Trumbull, Mike Marlow, Ray Martin, Allen Cooper, Robert Immel, Bob Patrick, Martin Hijmans, Trevor Hill.
Project = International Decade of Ocean Exploration (IDOE), International Decade of Ocean Exploration (IDOE)


eastern Greater Antilles, northeast Caribbean Sea, North America, North Atlantic;

North: 30.2871 South: 15.375 West: -68.9967 East: -58.5853


photo of United Geo I
United Geo I


Garrison, L.E., 1972, Acoustic reflection profiles, Eastern Greater Antilles, International Decade of Ocean Exploration, Leg 3, 1971 cruise, UNITEDGEO I: , USGS-GD-72-004, PB-207-596. 19 p.


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Dredge --- Biology
Sparker --- Sparker
ITT 4007 satellite navigation --- Navigation
1971-003-FA-LN-002 ( Zip file of trackchart maps)
1971-003-FA-LN-001 ( Navigation data in InfoBank)
Magnetometer (wh) --- Magnetics
NGDC MGD77 data ( )
1971-003-FA-GP-001 ( Gravity and magnetic data in InfoBank)
Gravity meter (wh) --- Gravity
NGDC MGD77 data ( )
Decca radar system --- Navigation
3.5 kHz --- Sub Bottom Profiler
1971-003-FA-BA-001 ( Bathymetric data in InfoBank)
NGDC MGD77 data ( )
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
1971-003-FA-SE-001 ( analog tape of seismic data)
1971-003-FA-SE-003 ( zip archive of scanned records sections used for publication (includes lines 1-50))
1971-003-FA-SE-002 ( zip archive of scanned record sections for line 35-46)

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