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USGS Coastal and 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):

Principal Investigator(s): N. Terence Edgar

Affiliate Investigator(s): Juan Trias

Information Specialist(s):

Data Type(s): Electro-Magnetic: Gravity, 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 Port/Location: Roosevelt Roads, Puerto Rico

End Port/Location: Roosevelt Roads, Puerto Rico

Start Date: 1985-02-28

End Date: 1985-03-11

Equipment Used: Air gun, Single channel hydrophone, Gravity meter (wh), Magnavox System 5000 integrated navigation system

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).


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

North: 19 South: 17.5 West: -67 East: -64


photo of John Wesley Powell
John Wesley Powell


Edgar, N.T., and Scanlon, K.M., 1987, Single-channel seismic-reflection profiles collected aboard R/V POWELL, Cruises P-2-85, P-3-85, P-4-85 in the nearshore waters around Puerto Rico and the Virgin Islands: U.S. Geological Survey Open-File Report 87-147, 3 p..


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Air gun --- Air Gun / Water Gun
Gravity meter (wh) --- Gravity
NGDC MGD77 data ( )
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-001 ( Collection of paper record displays of seismic data( AIR) for lines )
1985-004-FA-SE-002 ( microfilm of )

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