Survey Identifier: POL7108
Format Acronym: MGD77
Data Center File Number: 03040056
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19800207
Source Institution: NOAA/POL
Country: UNITED STATES
Platform Name: OCEANOGRAPHER
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DR.R.E.BURNS-1ST HALF SEE AD.DOC
Project: JUAN DE FUCA RIDGE AND SOVANCO FRACTURE ZONE RP-5-OC-71
Survey Departure Date (yyyymmdd): 19710825
Port of Departure: 48.3666, -128.1366
Survey Arrival Date (yyyymmdd): 19710918
Port of Arrival: 48.8924, -129.0723
Navigation Instrumentation: AN/SRN-9 SATELLITE/LORAN-A/LORAN-C
Bathymetry Instrumentation: EDO-33A REC./EDO-248A/RAYTHEON-105 REC.
Additional Forms of Bathymetric Data: PUNCH CARDS
Magnetics Instrumentation: VARIAN(V4937) D.R. PROTON MAGNETOMETER
Additional Forms of Magnetics Data: PUNCH CARDS/ANALOG
Gravity Instrumentation: ASKANIA GSS2
Additional Forms of Gravity Data: PUNCH CARDS
Seismic Instrumentation: ELECTROMAGNETIC BUBLE-PULSE TRANS. 170 H
Topmost Latitude of Survey: +50
Bottommost Latitude: +48
Leftmost Longitude: -130
Rightmost Longitude: -128
General Digitizing Rate of Bathymetry: 137
Interpolation Scheme: 5-MINUTE INT. AND AT PEAKS AND DEEPS
General Digitizing Rate of Magnetics: 135
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 198
Reference Field Code: 03
Reference Field: IGRF-1965
General Digitizing Rate of Gravity: 142
Corrections Applied: SHAFT ENCODER/CROSS COUPLING/SEE AD DO
Additional Documentation: GRAVITY DRIFT: +0.6 MGALS(1ST PHASE), +1.5 MGALS(2ND PHASE), IGRF DERIVED FROM WORLD WIDE MEASUREMENTS(IAGA COMM. 2. 1969), CHIEF SCIENTIST: 2ND HALF-WILLIAM H. LUCAS, WARNING: MGD77 DATA RECORDS FOR THIS CRUISE MAY CONTAIN NEGATIVE GRAVITY, ANOMALY VALUES THAT SHOULD BE POSITIVE.
Number of Data Records: 2394
Min/Max Data Record:
Date: 1971 08 25
Latitude: +48.26330
Longitude: -129.62330
Bathymetry, 2- Way Traveltime: 015897
Bathymetry, Corrected Depth: 1173.0
Magnetics Total Field, 1st Sensor: 547100
Magnetics Residual Field: -03930
Free-Air Anomaly: -7079
Min/Max Data Record:
Date: 1971 09 18
Latitude: +49.34830
Longitude: -128.11830
Bathymetry, 2- Way Traveltime: 146490
Bathymetry, Corrected Depth: 10986.8
Magnetics Total Field, 1st Sensor: 590000
Magnetics Residual Field: +36990
Free-Air Anomaly: +0000