Survey Identifier: TN037


Format Acronym: MGD77
Data Center File Number: 20010043
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19981120
Source Institution: TEXAS A&M UNIVERSITY
Country: USA
Platform Name: R/V T.THOMSON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): W.SAGER, A.KLAUS
Project: SHATSKY RISE EXPEDITION LEG 1
Funding: NSF OCE93-14229
Survey Departure Date (yyyymmdd): 19940723
Port of Departure: HONOLULU, HAWAII
Survey Arrival Date (yyyymmdd): 19940904
Port of Arrival: AGANA, GUAM
Navigation Instrumentation: GPS
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: HYDROSWEEP
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 TAPE
Gravity Instrumentation: LA COSTE & ROMBERG S-METER
Additional Forms of Gravity Data: DIGITAL TAPE
Seismic Instrumentation: GI AIRGUN & 4 AIRGUN ARRAY
Formats of Seismic Data: SINGLE CHANNEL ANAL.& 6 CHANNEL DIG.
Topmost Latitude of Survey: +41
Bottommost Latitude: +13
Leftmost Longitude: +144
Rightmost Longitude: -157
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
Interpolation Scheme: 1 MINUTE VALUES EXTRACTED FROM VERTICAL BEAM
General Digitizing Rate of Magnetics: 003
General Sampling Rate of Magnetics: 06
Magnetic Sensor Tow Distance: 182M
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: 001
General Sampling Rate of Gravity: 10
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: 9791553
Departure Base Station Description: DOD 0027-4 BRISBANE, AUS
Arrival Base Station Gravity: 9807275
Arrival Base Station Description: DOD 0249-0 DUNEDIN,NEW ZEALAND
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT. NAVIGATION: DR BETWEEN 1 MINUTE INTERVAL GPS FIXES, GPS PRESENT 24 HRS/DAY, GRAVITY: 1 SEC METER COUNTS FILTERED WITH 99 DEC STD.DEV. GAUSSIAN, CONVOLUTION WINDOW. FREE AIR ANOMALY SPIKES PRESENT BECAUSE, SAME FILTER NOT USED FOR NAVIGATION
Number of Data Records: 60506

Min/Max Data Record:
Date: 1994 07 23
Latitude: +13.49017
Longitude: -179.99871
Bathymetry, 2- Way Traveltime: 000467
Bathymetry, Corrected Depth: 35.0
Magnetics Total Field, 1st Sensor: 357410
Magnetics Residual Field: -11519
Observed Gravity: 9783829
Free-Air Anomaly: -1804

Min/Max Data Record:
Date: 1994 09 03
Latitude: +40.15291
Longitude: +179.99787
Bathymetry, 2- Way Traveltime: 105293
Bathymetry, Corrected Depth: 8055.0
Magnetics Total Field, 1st Sensor: 430210
Magnetics Residual Field: +10928
Observed Gravity: 9802307
Free-Air Anomaly: +2867