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Summary for Field Activity Number 1983-003-FA

Alternate Leg ID: AST 83-03

Area of Operations: Penobscot Bay, Maine, United States, North America, North Atlantic

Dates: June 09, 1983 to June 19, 1983

Objectives: To define the geologic and geophysical characteristics of the bottom and sub-bottom sediments of Penobscot Bay.

Type of Activity: Sea floor mapping

Information to be derived:

Summary: R/V ASTERIAS left Woods Hole for Camden, ME on 9 June 1983 with Capt. Colburn onboard. Greg Miller, Harley Knebel, and Kathy Scanlon drove to Camden on 10 June, meeting ASTERIAS at Willey's Wharf in the evening. We began surveying with the EG&G Uniboom seismic profiling system on the morning of 11 June and continued each day through 17 June. On 13 June we began running the EDO sidescan sonar system on selected lines. On the evening of 14 June, Harley Knebel got off ASTERIAS, turning the Chief Scientist's duties over to Kathy Scanlon, and Dave Nichols joined us. LORAN-C time delays received by a Northstar 6000 unit and printed out and taped by a TI Silent 700 were used as the primary means of navigation. Capt. Colburn made frequent checks on our position using radar "distances off" and navigational buoys. After the cruise, the LORAN-C time delays that were recorded by the Northstar unit were calibrated by Barry Irwin against positions from the NOS chart of the bay; appropriate ASF corrections were applied to the recorded time delays. Equipment malfunctions were few and of short duration. The Uniboom and sidescan data were recorded on paper by flatbed recorders. All of the Uniboom data (except for 5 hours on 13 June) were also recorded on analog tape. We spent the nights of June 10, 12, 14, 16, and 17 tied up at Willey's Wharf in Camden, ME. The nights of June 11, 13, and 15 we anchored in convenient coves. On 18 June, Greg Miller and Kathy Scanlon drove from Camden to Woods Hole, while Capt. Colburn and Dave Nichols set out in ASTERIAS. They arrived in Woods Hole on the morning of 19 June. 243 km of Uniboom (high-resolution seismic reflection) and 71 km of sidescan sonar data collected.

USGS Project Number: 9470-02421

Contact: Harley Knebel (

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
photo of ASTERIAS
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