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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1985-037-FA

Other ID: 85 Leg 3B; FRNL 85-3B

Status: Completed

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

Funding Program(s):

Principal Investigator(s): N. Terence Edgar

Affiliate Investigator(s): Lindsay Parson - British Institute of Oceanographic Sciences (IOS)

Information Specialist(s):

Data Type(s): Sonar: Sidescan, Seismics: Air Gun / Water Gun, Seismics: Boomer, Seismics: Bubble Gun, Seismics: Sparker, Seismics: Sub Bottom Profiler, Electro-Magnetic: Magnetics, Sonar: Single Beam, Location-Elevation: Navigation

Scientific Purpose/Goals: To ensonify the central region of the Cayman Trough with the GLORIA sidescan system.


Start Port/Location: Key West, FL

End Port/Location: San Juan, Puerto Rico

Start Date: 1985-10-22

End Date: 1985-11-02

Equipment Used: 3.5 kHz, Air gun, Single channel hydrophone, 10 kHz Bathymetry, Magnavox satellite positioning system, GLORIA sidescan, ABC navigation system, Loran-C, Marine magnetometer

Information to be Derived:

Summary of Activity and Data Gathered: The Cayman Trough is a narrow rectangular deep which contains a sea floor spreading system. The survey took place over the coastal region of the spreading ridge and along one line to the eastern extremity of the Trough. These data provide detailed information of the history of spreading in the trough and thus the nature of the northern Caribbean plate boundary.

Staff: Dann Blackwood, Kathryn Scanlon Catanach, William Dillon, N. Terence Edgar, Gary W. Hill

Affiliate Staff:
IOS: Lindsay Parson - co-Ch. Sci.
Derek Bishop - GLORIA engineer
Robin Bonner - airgun tech.
Jon Campbell - GLORIA engineer
John Cherriman - GLORIA engineer
Andrew Harris - GLORIA engineer
Colin Jacobs - geologist; RVS: Doriel Jones - shipboard computing
Derek Lewis - shipboard computing

Notes: Participating agencies include: U.S. Geological Survey (USGS), British Institute of Oceanographic Sciences (IOS), and British Research Vessel Services (RVS). Original Center People field contained: N. Terence Edgar - co-Ch. Sci., USGS-Reston; Dann Blackwood - photographer, USGS-Woods Hole; William Dillon - geologist, USGS-Woods Hole; Gary Hill - geologist, USGS-Reston; Kathy Scanlon - geologist, USGS-Woods Hole.
Project = GLORIA Survey 1985, GLORIA Survey 1985


Cayman Trough, Cayman Islands, Caribbean Sea, North America, North Atlantic;

North: 22 South: 17.5 West: -85.5 East: -75


photo of Farnella



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
GLORIA sidescan --- Sidescan
Mosaic ( )
1985-037-FA-SO-002 ( Digital tapes of NV, GLORIA PASSES 1-34, and PROCESSED GLORIA: inventory #2966, 2967, 2968, 3617, 3618, and 3619.)
Air gun --- Air Gun / Water Gun
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
1985-037-FA-SE-002 ( microfilm of )
1985-037-FA-SE-003 ( analog tape of seismic data)
Marine magnetometer --- Magnetics
NGDC MGD77 data ( )
3.5 kHz --- Sub Bottom Profiler
10 kHz Bathymetry --- Single Beam
1985-037-FA-SE-001 ( Collection of paper record displays of seismic data( 10K) for lines )
NGDC MGD77 data ( )
ABC navigation system --- Navigation
Magnavox satellite positioning system --- Navigation
Loran-C --- Navigation
1985-037-FA-LN-001 ( Digital tapes of NV, GLORIA PASSES 1-34, and PROCESSED GLORIA: inventory #2966, 2967, 2968, 3617, 3618, and 3619.)

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