Survey Identifier: EW9101
Format Acronym: MGD77
Data Center File Number: 01210001
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19951118
Source Institution: LAMONT-DOHERTY EARTH OBSERVATORY (LDEO)
Country: USA
Platform Name: R/V MAURICE EWING
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): J.AUSTIN, T.SHIPLEY, J.MUTTER
Project: PACIFIC MARGIN OF ANTARCTICA
Funding: NSF OCE89-17332
Survey Departure Date (yyyymmdd): 19910201
Port of Departure: PUNTA ARENAS, CHILE
Survey Arrival Date (yyyymmdd): 19910316
Port of Arrival: PUNTA ARENAS, CHILE
Navigation Instrumentation: MAGNAVOX MX-1107RS TRANSIT, T-SET GPS
Geodetic Datum/Position: GPS/SATELLITE/LORAN + SPEED/HEADING
Bathymetry Instrumentation: ATLAS HYDROSWEEP-DS MULTIBEAM SONAR
Additional Forms of Bathymetric Data: RAYTHEON 3.5KHZ, 12KHZ PDR
Magnetics Instrumentation: VARIAN V-75 MAGNETOMETER
Gravity Instrumentation: BODENSEEWERKE KSS-30 GRAVIMETER
Additional Forms of Gravity Data: BELL BGM-3 GRAVIMETER
Seismic Instrumentation: DIGICON DMS-2000 MULTI-CHANNEL ARRAY
Formats of Seismic Data: SONOBUOYS
Topmost Latitude of Survey: -52
Bottommost Latitude: -70
Leftmost Longitude: -080
Rightmost Longitude: -055
General Digitizing Rate of Bathymetry: 010
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: 1-MINUTE INTERVALS
General Digitizing Rate of Magnetics: 010
Reference Field Code: 12
Reference Field: IGRF-85
Method of Applying Residual Field: BILINEAR INTERPOLATION IN 1-DEGREE SQUARE
General Digitizing Rate of Gravity: 010
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNATIONAL 30
Reference System Code: 2
Reference System: POTSDAM SYSTEM
Corrections Applied: DRIFT -.00755 MGAL/DAY, DC 22.76
Departure Base Station Gravity: 9813159
Departure Base Station Description: GW-97
Arrival Base Station Gravity: 9813159
Arrival Base Station Description: GW-97
Additional Documentation: TIME: KINEMETRICS 468-DC, SPEED: FURUNO CI-30, HEADING: SPERRY MK-27, LORAN: INTERNAV LC-408, DMEC NORTHSTAR-6000, Sound Velocity was corrected with XBT's and NODC historic data, The automatic correction feature was found to be as much as 20m/sec in error. SCIENCE OFFICER: J.STENNETT COMPUTER SYSTEMS: R.BLAES, DATA REDUCED BY LDEO MARINE OFFICE DATA REDUCTION GROUP, ORIGINAL RECORDS ARCHIVED AT LDEO
Number of Data Records: 62056
Min/Max Data Record:
Date: 1991 02 01
Latitude: -69.43559
Longitude: -79.81619
Bathymetry, 2- Way Traveltime: 000350
Bathymetry, Corrected Depth: 26.0
Magnetics Total Field, 1st Sensor: 327900
Magnetics Residual Field: -10670
Free-Air Anomaly: -1099
Min/Max Data Record:
Date: 1991 03 16
Latitude: -52.33850
Longitude: -55.46516
Bathymetry, 2- Way Traveltime: 070710
Bathymetry, Corrected Depth: 5286.0
Magnetics Total Field, 1st Sensor: 465180
Magnetics Residual Field: +19470
Free-Air Anomaly: +1347