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Summary for Field Activity Number 1976-024-FA

Alternate Leg ID: 76-2

Area of Operations: Baltimore Trough, Mid-Atlantic Continental Shelf, United States, North America, North Atlantic

Dates: July 07, 1976 to July 14, 1976

Objectives: The purposes of this cruise were to: 1. survey the geologic and biologic conditions around the pipes and railroad wheels set in June 1975; 2. inspect the fully instrumented tripods in operation on the bottom prior to recovering them; 3. survey the COST drill site; and 4. make a downslope traverse near the shelf edge where Conservation Division seismic data suggested possible bottom instability.

Type of Activity: Sampling
Mooring work
Photography
submersible dives

Information to be derived: Time series data
Sea floor map
Mooring performance

Summary: Despite continuously poor weather, geology-biology surveys were carried out, 2 pipes not located, and tripod functions fully documented on bottom. At station 4119 lake or eel pouts interfered with sediment traps and curled into the current meter rotor vanes always oriented into the current, thus inhibiting short time variations in orientation. At station 4115 hake interfered with the current meters. Tripods were recovered in excellent condition. Moorings recovered: 2 (#113 and 114 deployed WHITEFOOT FA 76019 Jun. 14-17, 1976). Dives: 7 (#691, 692, 693, 694, 695, 696, and 697). Video; Submersible still photos; Niskin water samples: 3; Suspended matters samples: 9; XBTs: 8. Unable to locate 2 pipes.

USGS Project Number: EA

Contact: Dave Folger ()

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
photo of ATLANTIC TWIN
ATLANTIC TWIN
NEKTON GAMMA
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