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Summary for Field Activity Number 1982-028-FA

Alternate Leg ID: 82-G-9

Area of Operations: Alvin Canyon, Atlantis Canyon, Gilbert Canyon, Lydonia Canyon, Munson Canyon, Continental Slope, Bear Seamount, United States, North America, North Atlantic

Dates: August 08, 1982 to August 21, 1982

Objectives: Obtain color photographs of features interpreted from previously acquired data to represent sites of mass movement; acquire single-channel high-resolution seismic profiles along the photo traverses; and acquire gravity core samples of the photographed bottom at selected sites.

Type of Activity: Seismic profiling
Gravity Core Sampling

Information to be derived: Samples and chemical analysis

Summary: This cruise successfully accomplished its objectives. ANGUS photos were taken at 20 second intervals at 6-7 m above sea floor, the three synchronized cameras taking overlapping photos including an area as great as 450 sq. m. There was no photo overlap at nominal cruising speed of 0.75 knots. 6 nm of data were lost during the last day of the survey because heavy seas prevented safe launch of the camera vehicle. During times when the camera vehicle batteries were being recharged, we retraced the camera track with the minisparker in tow to obtain sub-bottom data along track. At selected sites along photo tracks the corer was deployed to obtain bottom samples. A dredge haul was made to identify a distinctive cliff-forming rock unit. ANGUS photography: 271 km; 3.5 kHz: 32.4 km; Minisparker: 241.4 km; 20 stations (19 core sites and 1 chain bag dredge).

USGS Project Number: 9840-51823

Contact: Dennis O'Leary ()

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
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