USGS Open File Report 01-123: Cruise-reports menu

Deep-Towed Chirp Profiles of the Blake Ridge Collapse Structure: USGS OFR 01-123

2. Cruise Reports

This section details information regarding the data, equipment, and scientific parties of the two cruises.

Cruise Number

92023

Old designator: CHAT12-92

95023

Old designator: CHAT17-95 L1

Dates of Cruise

21 Sep 1992 - 4 Oct 1992

11 Oct 1995 - 19 Oct 1995

Equipment Used on Both Cruises

The Ship: R/V Cape Hatteras

Built in 1981, the R/V Cape Hatteras is owned by the National Science Foundation and is operated and maintained jointly by Duke University and the University of North Carolina. The ship's homeport is the Duke University Marine Lab in Beaufort, North Carolina.

Visit their web page at: http://www.env.duke.edu/marinelab/hatteras/Hatteras.html

Image shows Research Vessel Cape Hatteras

Data source: Datasonics SIS 7000 "Bob"

The Datasonics Inc. SIS 7000 deep-towed sidescan sonar and chirp profiling unit was developed in 1990 in conjunction with the USGS. Nicknamed "Bob", the unit is able to be towed at great depths (more than 3000 meters) in order to create images of the deep sea floor. The "Bob" has 5 data channels, 2 sidescan, 2 bathymetry, and 1 chirp channel. Only the sidescan and chirp channels were used during these cruises.

Images shows Datasonics Inc. sidescan sonar and chirp profiling unit

Data Collected

92023

Deep towed chirp: 58 km of deep-towed data. See map for trackline locations. On the map solid lines refer to 1992 data.

Side Scan Sonar: 78 km² sidescan mosaic

Air gun single channel seismic reflection: approximately 1000 km of profiles. These data were reported by Taylor, M. Dillon, W. Anton, C., and Danforth, 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 (2 CD-ROMs).

95023

Deep towed chirp: 100 km of deep-towed data. See map for trackline locations. On the map dashed lines refer the 1995 data

Side Scan Sonar: 152 km ² sidescan mosaic

GI gun single channel seismic reflection: approximately 244.3 km of profiles.

This dataset was collected in conjunction with the Ocean Drilling Program Leg 164.

Further Cruise- Report Items

CRUISE SERIAL NUMBER:

92023

Alternate Leg or Cruise Number:

CH 12-92

Platform:

CAPE HATTERAS

Submersible (if any):

Owner-Operator:

Duke, UNC

Captain:

Center Principal and Affiliate Principal(if any):

W. Dillon, W. Schwab;

Area of Operations:

Blake Ridge

Bounding Coordinates

North:

31 30 33N

South:

West:

-75 76 30

East:

Start and End Dates:

SEP 21, 1992 to OCT 4, 1992

Start and End Ports:

from Morehead City to Morehead City

Number of Days at Sea:

Cruise Objectives:

To obtain digital seismic profiles in the area of gas hydrate development on the continental rise of N. and S. Carolina. To test and obtain data from the new USGS/Datasonics deep-towed sidescan sonar system.

Scientific Party

Crew Member	Affiliation	Duties
William Dillon	USGS, Woods Hole, MA	Co- Chief Scientist
William Schwab	USGS, Woods Hole, MA	Co- Chief Scientist
Tommy O'Brien	USGS, Woods Hole, MA	Scientist
B. Irwin	USGS, Woods Hole, MA	Scientist
L. Kooker	USGS, Woods Hole, MA	Scientist
William Danforth	USGS, Woods Hole, MA	Scientist
J. Gann	USGS, Woods Hole, MA	Scientist
Dwight Coleman	USGS, Woods Hole, MA	Scientist
Timothy Boynton	Duke Marine Lab, Beaufort, NC	Science Liaison
Fred Hegg	Datasonics Inc., Boston, MA	Equipment Consultant
Mark Parent	Datasonics Inc., Boston, MA	Equipment Consultant

Scientific Equipment:

2-channel srp w/160 cu. in. airgun, 30 kHz deep-towed SSS, 3.5 kHz profiling system; integrated loran-C (SAIL) system-Duke;

Navigation techniques used:

DGPS

Cruise Funding Source:

Project Title:

Contract:

Remarks:

Tabulated Information:

Days at Sea:

Continuous Data (in Km):

1458

Number of Stations Occupied:

Number of Submersible Dives:

Station Description:

Seismic Line Descriptions:

Track Plot:

Related Web Sites:

Report Date: 8:51 1/5/1998
Submitted by: Bill Dillon

CRUISE SERIAL NUMBER:

95023

Alternate Leg or Cruise Number:

CH 17-95 Leg1

Platform:

CAPE HATTERAS

Submersible (if any):

Owner-Operator:

Duke/UNC

Captain:

Dick Ogus

Center Principal and Affiliate Principal(if any):

Bill Dillon
Joe Gettrust-NRL-Stennis Space Center

Area of Operations:

Blake Ridge/Spur, SC

Bounding Coordinates

North:

32.1

South:

31.5

West:

-76.

East:

-75.3

Start and End Dates:

OCT 11, 1995 to OCT 19, 1995

Start and End Ports:

from Beaufort, NC to Beaufort, NC

Number of Days at Sea:

Cruise Objectives:

Sidescan sonar, seismic imaging of Blake Ridge collapse structure.

Scientific Party

Crew Member	Affiliation	Duties
William Dillon	USGS, Woods Hole, MA	Co- Chief Scientist
William Schwab	USGS, Woods Hole, MA	Co- Chief Scientist
Tommy O'Brien	USGS, Woods Hole, MA	Scientist
B. Irwin	USGS, Woods Hole, MA	Scientist
L. Kooker	USGS, Woods Hole, MA	Scientist
William Danforth	USGS, Woods Hole, MA	Scientist
J. Gann	USGS, Woods Hole, MA	Scientist
Dwight Coleman	USGS, Woods Hole, MA	Scientist
Timothy Boynton	Duke Marine Lab, Beaufort, NC	Science Liaison
Fred Hegg	Datasonics Inc., Boston, MA	Equipment Consultant
Mark Parent	Datasonics Inc., Boston, MA	Equipment Consultant

Scientific Equipment:

2-channel digital seismic system, 160 cu in airgun, Datasonics SIS-7000 mid-range sidescan sonar (Bob) system; NRL sidescan system

Navigation techniques used:

DGPS and P-Code

Cruise Funding Source:

Project Title:

Gas Hydrate

Contract:

Remarks:

Tabulated Information:

Days at Sea:

Continuous Data (in Km):

Number of Stations Occupied:

Number of Submersible Dives:

Station Description:

Seismic Line Descriptions:

Track Plot:

Related Web Sites:

Report Date: 15:50 5/16/2001
Submitted by: Tom O Brien

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