Survey Identifier: A2093L02
Format Acronym: MGD77
Data Center File Number: 02020061
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 1982 530
Source Institution: WOODS HOLE OCEANOGRAPHIC INST
Country: U.S.A.
Platform Name: ATLANTIS II
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DR.GEOFFREY THOMPSON
Project: CRUISE 93, LEG 2
Funding: NSF
Survey Departure Date (yyyymmdd): 19751119
Port of Departure: RECIFE,BRAZIL
Survey Arrival Date (yyyymmdd): 19751217
Port of Arrival: CAPETOWN, REP.OF SOUTH AR
Navigation Instrumentation: SATELLITE RECEIVER, DR
Geodetic Datum/Position: SAT. AND DR MERGED WITH SHIP VELOCITY
Bathymetry Instrumentation: PRIM-3.5,SEC-12, WIDE BEAM 1 SEC SWEEP
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: VARIAN PROTON-PRECESSION MAGNETOMETER
Additional Forms of Magnetics Data: ANALOG RECORDS, PUNCHED TAPES
Gravity Instrumentation: ARPA VIBRATING STRING ACCELEROMETER
Additional Forms of Gravity Data: ANALOG RECORDS, PUNCHED TAPE
Seismic Instrumentation: 40+80 CU.IN.AIRGUNS,SINGLE CHANNEL
Formats of Seismic Data: X-Y RECORDER SHEET RECORDS
Topmost Latitude of Survey: -10
Bottommost Latitude: -38
Leftmost Longitude: -033
Rightmost Longitude: +017
General Digitizing Rate of Bathymetry: 050
General Sampling Rate of Bathymetry: ONE/SECOND
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: 5- MINUTES AND BREAK SLOPE
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 03
Magnetic Sensor Tow Distance: 250
Reference Field Code: 04
Reference Field: IGRF 1975
Method of Applying Residual Field: LINER INTERPOLATION WITHIN ONE DEGREE SQUARE
General Digitizing Rate of Gravity: 050
General Sampling Rate of Gravity: 60
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IGA SYSTEM 1967
Reference System Code: 3
Reference System: IGSN 71
Corrections Applied: DRIFT=+.43MGAL/DAY BIAS=+11.6
Departure Base Station Gravity: 9781619
Departure Base Station Description: WHOI BASE STATION 886
Arrival Base Station Gravity: 9796390
Arrival Base Station Description: WHOI BASE STATION 888
Number of Data Records: 19309
Min/Max Data Record:
Date: 1975 11 19
Latitude: -37.22047
Longitude: -32.42170
Bathymetry, 2- Way Traveltime: 006375
Bathymetry, Corrected Depth: 480.0
Magnetics Total Field, 1st Sensor: 252110
Magnetics Residual Field: -07700
Observed Gravity: 9782111
Free-Air Anomaly: -0607
Min/Max Data Record:
Date: 1975 12 17
Latitude: -10.76708
Longitude: +16.42010
Bathymetry, 2- Way Traveltime: 080875
Bathymetry, Corrected Depth: 6125.0
Magnetics Total Field, 1st Sensor: 300000
Magnetics Residual Field: +08360
Observed Gravity: 9800376
Free-Air Anomaly: +1638