Survey Identifier: PLUM09WT
Format Acronym: MGD77
Data Center File Number: 15040224
Parameters Surveyed Code: 55513
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): P.LONSDALE
Project: PLUME LEG 9
Funding: NSF
Survey Departure Date (yyyymmdd): 19900711
Port of Departure: MANZANILLO, MEXICO
Survey Arrival Date (yyyymmdd): 19900726
Port of Arrival: SAN DIEGO, CALIFORNIA
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)
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: WATER GUN
Formats of Seismic Data: ANAL. RECORDS, 35MM FILM
Topmost Latitude of Survey: +33
Bottommost Latitude: +19
Leftmost Longitude: -119
Rightmost Longitude: -104
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: 88
Reference Field: IGRF-1990
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: 9785815
Departure Base Station Description: OCEANOGRAPHIC INST. MANZANILLO
Arrival Base Station Gravity: 9795355
Arrival Base Station Description: SIO MAR FAC PIER SAN DIEGO
Additional Documentation: PROCESSED BY ANDRA BOBBITT(MPL), GRAV by UTA ALBRIGHT(GDC), SIO, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 16 beams, 12.158 kHz, time instrumentation = Hewlett-Packard HP-5065A rubidium frequency standard. 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. 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: 21606
Min/Max Data Record:
Date: 1990 07 11
Latitude: +19.00220
Longitude: -118.81421
Bathymetry, 2- Way Traveltime: 001453
Bathymetry, Corrected Depth: 109.0
Magnetics Total Field, 1st Sensor: 417730
Magnetics Residual Field: -03395
Observed Gravity: 9785011
Free-Air Anomaly: -1392
Min/Max Data Record:
Date: 1990 07 26
Latitude: +32.70667
Longitude: -104.30000
Bathymetry, 2- Way Traveltime: 063307
Bathymetry, Corrected Depth: 4759.0
Magnetics Total Field, 1st Sensor: 476120
Magnetics Residual Field: +05324
Observed Gravity: 9795432
Free-Air Anomaly: +0926