Alternate number:

AST–80–6B

Platform:

R/V Asterias

Owner-Operator:

WHOI, Woods Hole, MA

Captain:

Dick Colburn, WHOI

Center Principal:

Charles J. O'Hara, Chief Scientist

Area of Operations:

Cox Ledge, Southern Rhode Island Sound, Martha's Vineyard, Muskeget Channel, Nantucket Sound, Massachusetts, United States, North America, North Atlantic

Bounding Coordinates (degrees)

North:

41.33

South:

41.17

West:

-71.50

East:

-70.50

Start and End Dates:

June 10, 1980, to June 12, 1980

Days at Sea:

3

Type of Activity:

Seismic profiling

Objectives:

To define the acoustic stratigraphy and structure of Cox Ledge, and to determine the occurrence and seaward extent of large, deeply buried preglacial valleys cut into the submerged coastal plain rocks beneath this part of the inner continental shelf.

Information to be derived:

Morphology of the sea-floor subbottom

Scientific Party
(USGS):

Charles J. O'Hara, Chief Scientist; John Eusden, Geological Field Assistant; Anne Whitney, Geological Field Assistant

Scientific Equipment:

EG&G Uniboom catamaran with mounted transducer
EG&G Trigger-Capacitor Bank
EPC Seismic Recorder (4100 series)
Teledyne Exploration Seismic Amplifier (Model 300)
Del Norte Hydrophone Streamer (30 element)
Krohn-Hite Band Pass Filter

Navigation techniques used:

Northstar 6000 LORAN-C

Summary of Results:

Uniboom: 226 kilometers of high-resolution subbottom profiles (122 nautical miles).

Continuous Data (in km):

226

Contact:

Charles J. O'Hara