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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1992-023-FA

Other ID: CH 12-92

Status: Completed

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

Funding Program(s):

Principal Investigator(s): William Dillon, William Schwab

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Seismics: Air Gun / Water Gun, Seismics: Sub Bottom Profiler, Sonar: Sidescan, Seismics: Multichannel

Scientific Purpose/Goals: To obtain digital seismic profiles in the area of gas hydrate development on the continental rise off North and South Carolina, and to test and obtain data from the new USGS/Datasonics deep-towed sidescan-sonar system.


Start Port/Location: Morehead City, NC

End Port/Location: Morehead City, NC

Start Date: 1992-09-21

End Date: 1992-10-04

Equipment Used: Multichannel seismics, Air gun, 3.5 kHz, SIS-7000 sidescan, Loran-C

Information to be Derived:

Summary of Activity and Data Gathered: Two research areas were studied; to the north at the head of the Cape Fear slide and to the south on the crest of Blake Ridge. The seismic profiling system worked perfectly and allowed collection of 163 km of excellent quality seismic data at the Cape Fear slide site and 1204 km at the Blake Ridge site. Unfortunately the outer section of the streamer was damaged during operations (presumably it went into the ship's propellers), but the damaged section was replaced by a spare section. Four sidescan sonar test lowerings were carried out. During the first 3 lowerings, only the port side provided data at operating depth. A leaking connector was identified and repaired. During the last day, the sidescan worked properly and collected 91 km data. Weather conditions prevented lowering of the sidescan for much of the cruise and one day was lost to Tropical Storm Earl.

Staff: Dwight Coleman, William Danforth, Barry Irwin, Thomas O'Brien

Affiliate Staff:
PMG - Larry Kooker
John Gann; Timothy Boynton - Duke/UNC; Mark Parent - Datasonics; Fred Hegg - Datasonics

Notes: Information from Foghorn: 2-channel seismic reflection profiling system w/160 cu. in. airgun, 30 kHz deep-towed sidescan sonar, 3.5 kHz profiling system


Cape Fear slide, Blake Ridge, United States, North America, North Atlantic;

North: 33.21418175 South: 31.42085035 West: -76.14414225 East: -75.04085242


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 1992-023-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
Cruise report (document not focused on specific equipment) General summary of the cruise with page size trackline plots. Includes personnel and equipment.
Q-MIPS log SIS-7000 sidescan Notes on navigation, linking files by name with operation times and events.
Geophysics log (document not focused on specific equipment) Overall catalog of data, with log of seismic operation.
Navigation printout (document not focused on specific equipment) Columnar printout of navigation data, without headings.

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Multichannel seismics --- Multichannel
1992-023-FA-SE-001 (microfilm of )
1992-023-FA-SE-002-01 (CD ROM disk of PROCESSED CDP, NAV, )
1992-023-FA-SE-002-02 (Processed SEG-Y Data)
1992-023-FA-SE-003 (Collection of paper record displays of seismic data( AIR) for lines )
Air gun data
1992-023-FA-SE-002 (Digital tape(s) of AIRGUN L1, AIRGUN L2, AIRGUN L2-3, AIRGUN L3-5, AIRGUN L6-7, AIRGUN L8-12, AIRGUN L13-15, AIRGUN L15-21, AIRGUN L22A, AIRGUN L23B-23, AIRGUN L1-5, AIRGUN L6-15B, AIRGUN L15C-23, NAV GPS+LORAN, SIS7000 SSS L24-25, SIS7000 SSS L26-27, SIS7000 SSS RAW+PROC, )
Air gun data 2
Air gun --- Air Gun / Water Gun
3.5 kHz --- Sub Bottom Profiler
SIS-7000 sidescan --- Sidescan
1992-023-FA-SO-001 (Digital tape(s) of AIRGUN L1, AIRGUN L2, AIRGUN L2-3, AIRGUN L3-5, AIRGUN L6-7, AIRGUN L8-12, AIRGUN L13-15, AIRGUN L15-21, AIRGUN L22A, AIRGUN L23B-23, AIRGUN L1-5, AIRGUN L6-15B, AIRGUN L15C-23, NAV GPS+LORAN, SIS7000 SSS L24-25, SIS7000 SSS L26-27, SIS7000 SSS RAW+PROC, )
Loran-C --- Navigation
1992-023-FA-LN-002-01 (Processed shotpoint navigation file prepared by MMS, New Orleans, LA in segp1 format.)
1992-023-FA-LN-002-02 (Navigation files for each line.)
1992-023-FA-LN-001-02 (Blake Ridge area trackmap of seismic lines 6-23.)
1992-023-FA-LN-001-01 (Cape Fear Slide trackmap of seismic lines 1, 2 and 5.)
Nav data

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