Survey Identifier: TUGA02WT


Format Acronym: MGD77
Data Center File Number: 15040192
Parameters Surveyed Code: 55511
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. PHIPPS-MORGAN
Project: TORTUGA LEG 2
Funding: NSF OCE87-02835
Survey Departure Date (yyyymmdd): 19871109
Port of Departure: PUERTO QUETZAL, GUATEMALA
Survey Arrival Date (yyyymmdd): 19871201
Port of Arrival: ACADEMY BAY, GALAPAGOS IS.
Navigation Instrumentation: SATNAV/GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERT.BEAM(2&2/3DEG)&3.5KHZ(WIDE)
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
Topmost Latitude of Survey: +14
Bottommost Latitude: -02
Leftmost Longitude: -097
Rightmost Longitude: -090
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H20
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
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: 10
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: IGSN-71
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. GRAVITY REPROCESSED NOV. 1988
Number of Data Records: 31181

Min/Max Data Record:
Date: 1987 11 09
Latitude: -1.23553
Longitude: -96.51082
Bathymetry, 2- Way Traveltime: 001387
Bathymetry, Corrected Depth: 104.0
Magnetics Total Field, 1st Sensor: 309300
Magnetics Residual Field: -09900
Observed Gravity: 9778814
Free-Air Anomaly: -1311

Min/Max Data Record:
Date: 1987 12 01
Latitude: +13.92450
Longitude: -90.28851
Bathymetry, 2- Way Traveltime: 081467
Bathymetry, Corrected Depth: 6168.0
Magnetics Total Field, 1st Sensor: 392030
Magnetics Residual Field: +07786
Observed Gravity: 9784921
Free-Air Anomaly: +1439