Survey Identifier: PLUM02WT
Format Acronym: MGD77
Data Center File Number: 15040210
Parameters Surveyed Code: 55531
File Creation Date (yyyymmdd): 19
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V T.WASHINGTON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): CHRISTIE,D. & DUNCAN, R.
Project: PLUME LEG 2
Funding: NSF
Survey Departure Date (yyyymmdd): 19900117
Port of Departure: GALAPAGOS ISLANDS, ECUADOR
Survey Arrival Date (yyyymmdd): 19900212
Port of Arrival: GALAPAGOS ISLANDS, ECUADOR
Navigation Instrumentation: SATNAV/GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERTICAL BEAM (2&2/3 DEG) & 3.5
Additional Forms of Bathymetric Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS MAGNETOMETER MOD G-801/3
Additional Forms of Magnetics Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: NONE COLLECTED
Formats of Seismic Data: NONE COLLECTED
Topmost Latitude of Survey: +03
Bottommost Latitude: -04
Leftmost Longitude: -093
Rightmost Longitude: -085
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
Interpolation Scheme: 1 MINUTE AVERAGES EXTRACTED FROM SEABEAM VERTICAL BEAMS
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF-1985
Method of Applying Residual Field: LIN.INTERP.POINTS WITHIN ONE DEGREE SQUARE
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 01
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Corrections Applied: EOTVOS AND METER DRIFT
Departure Base Station Gravity: 9795355
Departure Base Station Description: SIO MAR FAC PIER SAN DIEGO
Arrival Base Station Gravity: 9781620
Arrival Base Station Description: DOD 2242-5 RECIFE BRAZIL
Additional Documentation: DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. THE NAVIGATION HAS BEEN ADJUSTED FOR SEABEAM CROSSINGS ON SURVEYS. GRAVITY: 1 SEC METER COUNTS FILTERED WITH 25 POLE FILTER WITH 148 SEC DELAY. FREE AIR ANOMALY SPIKES PRESENT BECAUSE SAME FILTER NOT USED, FOR NAVIGATION.
Number of Data Records: 38510
Min/Max Data Record:
Date: 1990 01 16
Latitude: -3.33078
Longitude: -92.25662
Bathymetry, 2- Way Traveltime: 000893
Bathymetry, Corrected Depth: 67.0
Magnetics Total Field, 1st Sensor: 293760
Magnetics Residual Field: -22901
Observed Gravity: 9778965
Free-Air Anomaly: -0973
Min/Max Data Record:
Date: 1990 02 12
Latitude: +2.00333
Longitude: -85.14966
Bathymetry, 2- Way Traveltime: 048667
Bathymetry, Corrected Depth: 3642.0
Magnetics Total Field, 1st Sensor: 333690
Magnetics Residual Field: +13863
Observed Gravity: 9782314
Free-Air Anomaly: +1316