Survey Identifier: V3105
Format Acronym: MGD77
Data Center File Number: 01030178
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19890703
Source Institution: LAMONT-DOHERTY GEOLOGICAL OBSERVATORY
Country: USA
Platform Name: VEMA
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): JOHN DAMUTH
Project: CRUISE 31, LEG 05
Funding: NSF GA27281
Survey Departure Date (yyyymmdd): 19740508
Port of Departure: RIO DE JANEIRO, BRAZIL
Survey Arrival Date (yyyymmdd): 19740531
Port of Arrival: FORTALEZA, BRAZIL
Navigation Instrumentation: SATELLITE/ SEXTANT
Geodetic Datum/Position: SATELLITE/ DEAD RECKONING
Bathymetry Instrumentation: (SEE ADD DOC / 18)
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: L-DGO MFG PROTON-PRECESSION
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: GRAF-ASKANIA GSS2-12
Additional Forms of Gravity Data: ANALOG RECORDS
Seismic Instrumentation: L-DGO 25CU-IW-AIRGUN,EEL,DRUM RECORDER
Formats of Seismic Data: TWO,2-CHANNEL SHEET RECORDS
Topmost Latitude of Survey: -01
Bottommost Latitude: -24
Leftmost Longitude: -044
Rightmost Longitude: -025
General Digitizing Rate of Bathymetry: 060
General Sampling Rate of Bathymetry: ONE SECOND
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: NONE
General Digitizing Rate of Magnetics: 060
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF-65
Method of Applying Residual Field: LINEAR INTERPOLATION BETWEEN TWO PTS
General Digitizing Rate of Gravity: 100
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNAT'L 1930
Reference System Code: 2
Reference System: POTSDAM SYSTEM
Additional Documentation: 06 -3.5 AND 12 KHZ, WIDE BEAM (60 DEG), 1 SECOND SWEEP, GA27281, GA3463, GX2867, GA17122
Number of Data Records: 6860
Min/Max Data Record:
Date: 1974 05 08
Latitude: -23.34570
Longitude: -43.12090
Bathymetry, 2- Way Traveltime: 000350
Bathymetry, Corrected Depth: 26.0
Magnetics Total Field, 1st Sensor: 235440
Magnetics Residual Field: -05300
Free-Air Anomaly: -0746
Min/Max Data Record:
Date: 1974 05 31
Latitude: -1.63410
Longitude: -25.66320
Bathymetry, 2- Way Traveltime: 075225
Bathymetry, Corrected Depth: 5687.0
Magnetics Total Field, 1st Sensor: 277330
Magnetics Residual Field: +03620
Free-Air Anomaly: +2184