Survey Identifier: C3001


Format Acronym: MGD77
Data Center File Number: 01010302
Parameters Surveyed Code: 55513
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): JOHN MUTTER, ROBERT DETRICK
Project: MAR CREST MCS,NEAR AXIS SEDIMENT POND SCS SURVEY
Funding: NSF/JOI/NRL
Survey Departure Date (yyyymmdd): 19890111
Port of Departure: PONTA DELGADA, AZORES
Survey Arrival Date (yyyymmdd): 19890127
Port of Arrival: BRIDGETOWN, BARBADOS
Navigation Instrumentation: FURUNO,TRANSIT SATELLITE,GPS
Geodetic Datum/Position: FURUNO DR BETWEEN SAT FIXES
Bathymetry Instrumentation: GENERL INSTRMNTS SEABEAM CENTER BEAM
Additional Forms of Bathymetric Data: SWATH ALSO COLLECTED BY URI
Magnetics Instrumentation: VARIAN V75 MAGNETOMETER
Gravity Instrumentation: BELL AEROSPACE BGM-3 GRAVITY METER
Seismic Instrumentation: DIGICON DSS-240
Topmost Latitude of Survey: +38
Bottommost Latitude: +14
Leftmost Longitude: -058
Rightmost Longitude: -025
General Digitizing Rate of Bathymetry: 10
General Sampling Rate of Bathymetry: VAR W/ DEPTH
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 0
Interpolation Scheme: LOGGED ALL CNTR BEAM,CLOSEST TO 0 SECS. INTERP
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: 8
Theoretical Gravity Formula: INTERNATIONAL 80
Reference System Code: 2
Corrections Applied: +.0947 MGAL/DAY, DC +18.1 MGAL
Departure Base Station Gravity: 9801300
Departure Base Station Description: AZR METEOROLOGICAL OBS.ACIC 0226-
Arrival Base Station Gravity: 9782946
Arrival Base Station Description: CAMBRIDGE G&G NEW HARBOR JETTY
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 ) . PRECRUISE GRAVITY TIE IN AZORES AT 1130Z 9 JAN 89, POSTCRUISE GRAVITY TIE IN BARBADOS AT 1430Z 28 JAN 89, SAMPLING RATE IS APPROXIMATELY 1PING/6SEC BUT DOES VARY WITH DEPTH, Navigation for the multibeam bathymetry was adjusted to match bathymetry
Number of Data Records: 23204

Min/Max Data Record:
Date: 1989 01 11
Latitude: +14.74835
Longitude: -57.06916
Bathymetry, 2- Way Traveltime: 003623
Bathymetry, Corrected Depth: 273.0
Magnetics Total Field, 1st Sensor: 364850
Magnetics Residual Field: -03750
Observed Gravity: 9783958
Free-Air Anomaly: -0813

Min/Max Data Record:
Date: 1989 01 27
Latitude: +37.73849
Longitude: -25.65328
Bathymetry, 2- Way Traveltime: 083338
Bathymetry, Corrected Depth: 6342.0
Magnetics Total Field, 1st Sensor: 431940
Magnetics Residual Field: +04040
Observed Gravity: 9801746
Free-Air Anomaly: +1596