Survey Identifier: PLUM04WT
Format Acronym: MGD77
Data Center File Number: 15040212
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): J.ORCUTT, D.FORSYTH
Project: PLUME LEG 4
Funding: NSF
Survey Departure Date (yyyymmdd): 19900308
Port of Departure: RECIFE, BRAZIL
Survey Arrival Date (yyyymmdd): 19900411
Port of Arrival: MONTEVIDEO, URUGUAY
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
Topmost Latitude of Survey: -08
Bottommost Latitude: -36
Leftmost Longitude: -057
Rightmost Longitude: -013
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: 9781620
Departure Base Station Description: DOD 2242-5 RECIFE BRAZIL
Arrival Base Station Gravity: 9781620
Arrival Base Station Description: DOD 2242-5 RECIFE, BRAZIL
Additional Documentation: SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. 12.158 kHz, 16 beams, PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRPAHY, 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. time instrumentation = Hewlett-Packard HP-5065A rubidium frequency standard, NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS may not exactly correspond to the multibm data available.
Number of Data Records: 48889
Min/Max Data Record:
Date: 1990 03 08
Latitude: -35.55866
Longitude: -56.22510
Bathymetry, 2- Way Traveltime: 001320
Bathymetry, Corrected Depth: 99.0
Magnetics Total Field, 1st Sensor: 235080
Magnetics Residual Field: -07137
Observed Gravity: 9780638
Free-Air Anomaly: -0582
Min/Max Data Record:
Date: 1990 04 11
Latitude: -8.04566
Longitude: -13.08436
Bathymetry, 2- Way Traveltime: 081013
Bathymetry, Corrected Depth: 6135.0
Magnetics Total Field, 1st Sensor: 264220
Magnetics Residual Field: +04481
Observed Gravity: 9799158
Free-Air Anomaly: +1171