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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1995-023-FA

Other ID: CH 17-95 Leg 1

Status: Completed

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

Funding Program(s):

Principal Investigator(s): William Dillon

Affiliate Investigator(s): Joe Gettrust - NRL-Stennis Space Center

Information Specialist(s):

Data Type(s): Imagery: Photo, Imagery: Video, Location-Elevation: Navigation, Sampling: Geology, Seismics: Air Gun / Water Gun, Sonar: Sidescan

Scientific Purpose/Goals: Sidescan sonar and seismic imaging of Blake Ridge collapse structure.


Start Port/Location: Beaufort, NC

End Port/Location: Beaufort, NC

Start Date: 1995-10-11

End Date: 1995-10-19

Equipment Used: DGPS, Air gun, Single channel hydrophone, Sidescan sonar, SIS-7000 sidescan, ARGO

Information to be Derived:

Summary of Activity and Data Gathered:

Staff: William Danforth, Rebecca Drury, Barry Irwin, Thomas O'Brien

Affiliate Staff:
Joe Gettrust - NRL; Mary Rowe - NRL; Larry Kooker - tech. - USGS-Menlo; Fred Hegg - tech. - Datasonics

Notes: Original Center People field contained: Bill Danforth - Ch. Sci.; Tom O'Brien - tech., Rebecca Drury - data curator, Barry Irwin - nav. tech., Greg Miller - tech.
Project = Gas Hydrate, Gas Hydrate


Blake Ridge, Blake Spur, South Carolina, United States, North America, North Atlantic;

North: 32.5 South: 31.5 West: -76 East: -75


photo of Cape Hatteras
Cape Hatteras


Anton, C., Dillon, W.P., and Lee, M., 1999, Anomalous, nearly horizontal, seismic reflection at the Blake Ridge--Evidence for a gas trap crosses the base of gas hydrate stability [abs.]: Eos, Transactions, American Geophysical Union, Spring Meeting, v. 80 no. 17-supplement.

Taylor, M.H., Dillon, William P., Anton, Christopher H., and Danforth, William, 1999, Seismic-reflection surveys of the Blake Ridge, R/V CAPE HATTERAS 1992 and 1995; data acquisition, navigation and processing: U.S. Geological Survey Open-File Report 99-372, URL:


FAN 1995-023-FA has data viewable in the GeoMappApp/Virtual Ocean applications. To view this data in these applications go to and See the instructions for locating USGS data in these applications. You can also view the imagery created from the SEGY data at

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Air gun --- Air Gun / Water Gun
SIS-7000 sidescan --- Sidescan
1995-023-FA-SO-002 ( CD ROM disk of L7,8,9,10,11 BLAKE RIDGE, )
1995-023-FA-NL-002 ( CD ROM disk of L7,8,9,10,11 BLAKE RIDGE, )
Sidescan sonar --- Sidescan
DGPS --- Navigation
Nav data ( )
1995-023-FA-LN-001-01 ( Raw navigation)
1995-023-FA-LN-001-02 ( Processed navigation)
ARGO --- Photo
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
Chirp seismic data ( )
1995-023-FA-SE-001 ( Digital tape(s) of SSS-SBTM L7-9, SSS-SBTM L10-11, SSS-SBTM L8, )
1995-023-FA-SE-001-01 ( SEGY seismic data)

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