United States Geological Survey, Menlo Park, California. Chief Scientists: Alan Cooper, Fred Davey. Geological and Geophysical data (3dot5khz, 12khz, gradiometer, uniboom, airgunmonitor, airgun, sonobuoy, gravitycore, chaindredge, dartcore, magnetics, Digitrack, heatflow, integratednavigation, transitsatellite, 24channel) of field activity L-2-84-AN in Antarctica from 02/03/1984 to 03/03/1984
Location
Antarctica
Summary
physical data holdings
Approximately 2,350-line km of multichannel seismic-reflection data, as well as 4,500 km of other geophysical profile data including gravity, magnetic gradiometer, and echo-sounding profiles for the western Ross Sea, Antarctica were collected. The seismic source consisted of a tuned five-airgun array totaling 1,311 cu.in. pressurized to 1,900 psi, towed at a depth of 10.5 m. The receiver consisted of a 24-channel hydrophone streamer, with 100-m group lengths containing 60 hydrophones in each group. The streamer was towed at a depth of 12.5 m. The data were recorded with a GUS Model HDDR-4200 recording system. All lines were recorded to 12 sec, with exception of Line 407 (15 sec) and Line 419 (8 sec). Magnetic data were recorded continuously with a Geometrics proton-procession gradiometer to remove the large temporal magnetic variations commonly recorded at polar latitudes. The gradiometer system consisted of two proton-precession magnetometers separated horizontally by 500 ft (152 m) with the forward sensor lying 225 m aft of the ship. Both sensors were towed at a depth of approximately 20-40m. Data were sampled at 4-sec intervals. Gravity data were recorded continuously with a LaCoste and Romberg sea gravimeter (S53) on a two-axis stabilized platform. The data were collected at 20-sec intervals and subsequently desampled to 2 min or greater for plotting and modeling.
Info derived
Seismic reflection profiles, gravity, magnetics, lithology, and bathymetry.
Comments
Based on data in best navigation file, l-2-84-an.070, cumulative trackline distance to the nearest tens of kilometers is 8120 kilometers.
Staff information imported from InfoBank
Aaron Dunwald - Chief Engineer
Al McClenaghan - Ship Captain
Alan Cooper - Chief Scientist
Andy Stevenson - Geologist
Brian Edwards - Geologist
Dave Howell - Geologist
Dennis Mann - Chief Watchstander
Donna Blackman - Watchstander
Erk Reimnitz - Geologist
Fred Davey - Chief Scientist
Herman Karl - Geologist
Holly Ryan - Watchstander
Jim Vaughan - Chief Engineer
Joe Edwards - Mechanical Technician
John Behrendt - Geophysicist
John Rapp - Geochemist
Kaye Kinoshita - Navigator
Kevin O'Toole - Mechanical Technician
Pat Moore - Chief Mate
Roy Fields - Electronics Technician
Shawn Dadisman - Dafe Curator
Skip Pelletier - Watchstander
Platform
Samuel Phillips Lee
USNS S. P. Lee (T-AGS-31), Length 208 feet, Beam 39 feet, Draft 14 feet, Speed 12 knots
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