USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1985-004-FA

Other ID: P-2-85

Status: Completed

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

Funding Program(s):

Location: U.S. Virgin Islands, Puerto Rico, United States, Caribbean Sea, North America, North Atlantic;

Principal Investigator(s): N. Terence Edgar

Affiliate Investigator(s): Juan Trias

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Seismics: Air Gun / Water Gun

Scientific Purpose/Goals: Collect high-resolution single-channel seismic reflection data near Puerto Rico and the U.S. Virgin Islands. This endeavor was secondary to the collection of gravity data by the USGS-Menlo Park personnel for the Defense Mapping Agency (DMA). This report covers the seismic reflection aspects of the cruise.


Start Date: 1985-02-28

Start Port/Location: Roosevelt Roads, Puerto Rico

End Date: 1985-03-11

End Port/Location: Roosevelt Roads, Puerto Rico

Equipment Used: Air gun, Magnavox System 5000 integrated navigation system, Single channel hydrophone

Information to be Derived:

Summary of Activity and Data Gathered: Seismic reflection data gathered: Lines 22, 19, 2, 1, 18, 48, 722, 4748A, 47, 722C, 24, 54A, 41, 40-TRANS, 40, 39-TRANS, 39, 38A, 15A, 26-EAST, 14A, 15-WEST, 14B, and 15B.


Affiliate Staff:
USGS-Menlo Park: Byron Ruppel - Gravity
Dick Tagg - Gravity
Dave Hogg - Electrical Tech.
John Erickson - Mechanical Tech.; USGS-Reston: Terence Edgar - Seismics; USGS-SJPR: Juan Trias - Seismics

Notes: Three cruises totaled 32 days at sea; 4,600 mi of seismic data. Cruise reports for Field Activities 85004, 85005 and 85007 detail the 3 legs of this project: LEG 2 - 02/28-03/11/1985 (FA 85004); LEG 3 - 03/15/-03/28/1985 (FA 85005); LEG 4 - 04/01-04/08/1985 (FA 85007).

Location Map:


photo of John Wesley Powell
John Wesley Powell


(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
Air gun --- Air Gun / Water Gun
Magnavox System 5000 integrated navigation system --- Navigation
1985-004-FA-LN-001-01 ( Trackmap for Leg 2 (pdf file) Trackline map for POWELL Leg P-2 only, including line numbers.)
1985-004-FA-LN-001-02 ( Trackmap for Legs 1, 2, 3 and 4 (pdf file) Composite trackmap for POWELL Legs P-1 (see InfoBank), P-2 (FA 85004), P-3 (FA 85005), and P-4 (FA 85007).)
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
1985-004-FA-SE-002 ( microfilm of )
1985-004-FA-SE-001 ( Collection of paper record displays of seismic data( AIR) for lines )