Other ID: AST 81-2
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Block Island Sound, Rhode Island, Connecticut, Long Island Sound, United States, North America, North Atlantic;
Principal Investigator(s): Sally Needell
Affiliate Investigator(s): Ralph Lewis - CT DEP, LISRC
Data Type(s): Location-Elevation: Navigation, Seismics: Boomer, Seismics: Sub Bottom Profiler, Sonar: Sidescan
Scientific Purpose/Goals: Define the geology and shallow structure of Block Island Sound and eastern Long Island Sound; determine the geologic framework and Quaternary development of Block Island Sound; identify and map potential geologic hazards; and complement a similar study in Rhode Island Sound.
Start Date: 1981-09-10
Start Port/Location: Woods Hole, MA
End Date: 1981-09-18
End Port/Location: Woods Hole, MA
Equipment Used: EG&G 234, Edo Western Sidescan and 2.5 kHz sub-bottom system, Loran-C, Single channel hydrophone
Information to be Derived: Sea floor map; Morphology;
Summary of Activity and Data Gathered: High-resolution seismic reflection profiling: 702 km; Sidescan sonar recording: 402 km.
Staff: Frank W. Jennings, Sally Needell
Notes: Operational procedures: Seismic sound source/receiver position = 10 m astern; Seismic sound source/receiver separation = 10 m; Seismic recorder sweep rate = 0.25 s; Seismic sound source trigger interval = 0.5 s; Band pass filter setting = 400-4000 Hz; Sidescan sonar fish off starboard beam; Sidescan slant range varied 400, 200, 100 m each side of vessel; LORAN-C master transmitter in Seneca, NY (9960 Northeast chain); LORAN-C slave transmitters: W = Caribou, ME and Y = Carolina Beach, NC (9960 Northeast chain); Position logged at 5 min. intervals; Average ship speed = 5 kts. Original Center People field contained: Sally Wood Needell - Ch. Sci., Frank Jennings - ET.
Needell, S.W., and Lewis, Ralph S., 1982, High-resolution seismic-reflection profiles and sidescan-sonar records collected on Block Island Sound by U.S. Geological Survey, R/V ASTERIAS Cruise AST 81-2: U.S. Geological Survey Open-File Report 82-322, 2 p., download PDF.
Poppe, L.J., Paskevich, V.F., Lewis, R.S., and DiGiacomo-Cohen, M.L., 2002, Geological framework data from Long Island Sound, 1981-1990; a digital data release: U.S. Geological Survey Open-File Report 02-002, DVD-ROM, URL: http://woodshole.er.usgs.gov/openfile/of02-002/.