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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: Air gun, SIS-7000 sidescan, DGPS, Single channel hydrophone

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
Information from Foghorn: 2-channel digital seismic system, 160 cu. in. airgun, Datasonics SIS-7000 mid-range sidescan sonar (Bob) system


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

North: 32.26597464 South: 31.42657982 West: -76.07790455 East: -75.09147282


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.

Nealon, J.W., Dillon, W.P., Danforth, W.W., and O'Brien, T.F., 2002, Deep towed CHIRP profiles of the Blake Ridge collapse structure collected on USGS Cruises 92023 and 95023 aboard the R/V Cape Hatteras in 1992 and 1995: U.S. Geological Survey Open-File Report 2001-123,

Taylor, M.H., Dillon, W.P., Anton, C.H., and Danforth, W.W., 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

Documents associated with this activity

Title Survey Equipment Description
Seismic log Air gun Seismic log containing equipment configuration, line numbers, times, equipment performance, and data quality.
Q-Mips log SIS-7000 sidescan Q-Mips log including line and file names, equipment performance, and bottom features.

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, )
Chirp seismic data
1995-023-FA-SO-001 (Digital tape(s) of SSS-SBTM L7-9, SSS-SBTM L10-11, SSS-SBTM L8, )
DGPS --- Navigation
Nav data
1995-023-FA-LN-001-01 (Raw navigation)
1995-023-FA-LN-001-02 (Processed navigation)
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
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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