Survey Identifier: C2902
Format Acronym: MGD77
Data Center File Number: 01010289
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19910219
Source Institution: Lamont-Doherty Geological Observatory
Country: United States
Platform Name: R/V Robert D. Conrad
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Drs. Johm Mutter and Peter Buhl
Survey Departure Date (yyyymmdd): 19880214
Port of Departure: PUNTA ARENAS, CHILE
Survey Arrival Date (yyyymmdd): 19880229
Port of Arrival: PUNTA ARENAS, CHILE
Navigation Instrumentation: FURUNO,TRANSIT SAT,GPS
Geodetic Datum/Position: FURUNO DR BETWEEN SAT FIXES
Bathymetry Instrumentation: Raytheon LSR 3.5 PDR
Magnetics Instrumentation: VARIAN V75 MAGNETOMETER
Gravity Instrumentation: BELL AEROSPACE BGM-3 GRAVITY METER
Seismic Instrumentation: DIGICON DSS-240
Topmost Latitude of Survey: -52
Bottommost Latitude: -58
Leftmost Longitude: -073
Rightmost Longitude: -064
General Digitizing Rate of Bathymetry: 10
General Sampling Rate of Bathymetry: 1 each 1 sec
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 0
General Digitizing Rate of Magnetics: 10
General Sampling Rate of Magnetics: 20
Magnetic Sensor Tow Distance: 0
Sensor Depth: 0
Horizontal Sensor Separation: 0
Reference Field Code: 88
Reference Field: IGRF-85
Method of Applying Residual Field: BILINEAR INTERP IN 1 DEG SQUARE
General Digitizing Rate of Gravity: 10
General Sampling Rate of Gravity: 0
Theoretical Gravity Formula Code: 2
Reference System Code: 2
Corrections Applied: +.0328 MGAL/DAY, DC +2.8 MGAL
Departure Base Station Gravity: 9780300
Departure Base Station Description: NOAA SHIP BASE NO.2,MIAMI,1/7/87
Arrival Base Station Gravity: 9813262
Arrival Base Station Description: PORT ADMN BLDG,P.ARENAS,2/13/87
Additional Documentation: THEORETICAL GRAVITY FORMULA: Yo = 978.0327 * ( 1 + a - b ) where, a = .0053024 * sin( theta ) * sin( theta ), b = .0000058 * sin( 2 * theta ) * sin( 2 * theta ) .
Number of Data Records: 21944
Min/Max Data Record:
Date: 1988 02 14
Latitude: -57.42806
Longitude: -72.68392
Bathymetry, 2- Way Traveltime: 000206
Bathymetry, Corrected Depth: 15.0
Magnetics Total Field, 1st Sensor: 335070
Magnetics Residual Field: -08810
Observed Gravity: 9812722
Free-Air Anomaly: -1547
Min/Max Data Record:
Date: 1988 02 29
Latitude: -52.34363
Longitude: -64.87021
Bathymetry, 2- Way Traveltime: 060171
Bathymetry, Corrected Depth: 4505.0
Magnetics Total Field, 1st Sensor: 360200
Magnetics Residual Field: +14130
Observed Gravity: 9818315
Free-Air Anomaly: +1257