Survey Identifier: TUNE06WT
Format Acronym: MGD77
Data Center File Number: 15040239
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): H.STAUDIGEL
Project: TUNES LEG 6
Funding: OCE91-02183
Survey Departure Date (yyyymmdd): 19911031
Port of Departure: KWAJALEIN, MARSHALL ISLANDS
Survey Arrival Date (yyyymmdd): 19911202
Port of Arrival: APRA, GUAM
Navigation Instrumentation: GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERTICAL BEAM (2&2/3DEG)&3.5KHZ
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: 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: +25
Bottommost Latitude: +08
Leftmost Longitude: +144
Rightmost Longitude: +168
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-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: 9783464
Departure Base Station Description: KWAJALEIN DOD2071-1
Arrival Base Station Gravity: 9785255
Arrival Base Station Description: GUAM DOD0061-7
Additional Documentation: NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS do not exactly correspond to the multibm data available. SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 12.158 kHz, 16 beams. NAVIGATION: DR CSE/SPD BETWEEN 10 MINUTE INTERVAL GPS FIXES. GPS PRESENT, 23+ HRS/DAY, Amatec-Straza 2-D Doppler spd log, Sperry MK-27 Gyro, Loran & GPS, GRAVITY: 1 SEC METER COUNTS FILTERED WITH 25 POLE FILTER WITH 148 SEC DELAY. MEDIAN FILTER WITH 7.5 MINUTE WIDTH THEN APPLIED TO GRAVITY TO REMOVE SPIKES
Number of Data Records: 45658
Min/Max Data Record:
Date: 1991 10 31
Latitude: +8.73232
Longitude: +144.56796
Bathymetry, 2- Way Traveltime: 000467
Bathymetry, Corrected Depth: 35.0
Magnetics Total Field, 1st Sensor: 324350
Magnetics Residual Field: -17633
Observed Gravity: 9781058
Free-Air Anomaly: -2511
Min/Max Data Record:
Date: 1991 12 02
Latitude: +24.41774
Longitude: +167.73453
Bathymetry, 2- Way Traveltime: 121320
Bathymetry, Corrected Depth: 9347.0
Magnetics Total Field, 1st Sensor: 386910
Magnetics Residual Field: +06565
Observed Gravity: 9792159
Free-Air Anomaly: +2663