Survey Identifier: EW9106
Format Acronym: MGD77
Data Center File Number: 01210017
Parameters Surveyed Code: 55531
File Creation Date (yyyymmdd): 19951119
Source Institution: LAMONT-DOHERTY EARTH OBSERVATORY (LDEO)
Country: USA
Platform Name: R/V MAURICE EWING
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): M.MCNUTT
Project: MARQUESAS FRACTURE ZONE
Funding: NSF OCE90-12949
Survey Departure Date (yyyymmdd): 19910921
Port of Departure: EASTER ISLAND, CHILE VIA TONGA
Survey Arrival Date (yyyymmdd): 19911101
Port of Arrival: LYTTLETON, NEW ZEALAND
Navigation Instrumentation: MAGNAVOX MX-1107RS TRANSIT, T-SET GPS
Geodetic Datum/Position: GPS/SATELLITE FIXES + SPEED/HEADING
Bathymetry Instrumentation: ATLAS HYDROSWEEP-DS MULTIBEAM SONAR
Additional Forms of Bathymetric Data: RAYTHEON 3.5KHZ, 12KHZ PDR
Magnetics Instrumentation: VARIAN V-75 MAGNETOMETER
Gravity Instrumentation: BODENSEEWERKE KSS-30 GRAVIMETER
Additional Forms of Gravity Data: BELL BGM-3 GRAVIMETER
Seismic Instrumentation: WATERGUNS, AIRGUNS
Topmost Latitude of Survey: -08
Bottommost Latitude: -44
Leftmost Longitude: +172
Rightmost Longitude: -109
General Digitizing Rate of Bathymetry: 010
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: 1-MINUTE INTERVALS
General Digitizing Rate of Magnetics: 010
Reference Field Code: 88
Reference Field: IGRF-90
Method of Applying Residual Field: BILINEAR INTERPOLATION IN 1-DEGREE SQUARE
General Digitizing Rate of Gravity: 010
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNATIONAL 30
Reference System Code: 2
Reference System: POTSDAM SYSTEM
Corrections Applied: DRIFT .0311 MGAL/DAY, DC 14.65
Departure Base Station Gravity: 9796325
Departure Base Station Description: ACIC 0301-1
Arrival Base Station Gravity: 9788712
Arrival Base Station Description: ACIC 0377-1
Additional Documentation: TIME: KINEMETRICS 468-DC, SPEED: FURUNO CI-30, HEADING: SPERRY MK-27, PHYSOCEAN DATA: XBTS; DIGITAL SINGLE CHANNEL SEISMIC COLLECTED SEPT.27-OCT.17, AVAILABLE FROM NGDC. SCIENCE OFFICER: B.FRANCIS; COMPUTER SYSTEMS:, S.BUDHYPRAMONO; DATA REDUCED BY LDEO MARINE OFFICE DATA REDUCTION GROUP, CONTACT LDEO MG&G ARCHIVIST WITH QUESTIONS/PROBLEMS: MGGDB@LDEO.COLUMBIA.EDU, ORIGINAL RECORDS ARCHIVED AT LDEO, NO MULTIBEAM DATA AVAILABLE AT NGDC WEST OF 175 W.
Number of Data Records: 58312
Min/Max Data Record:
Date: 1991 09 21
Latitude: -43.61299
Longitude: -180.00000
Bathymetry, 2- Way Traveltime: 000210
Bathymetry, Corrected Depth: 16.0
Magnetics Total Field, 1st Sensor: 315310
Magnetics Residual Field: -10000
Free-Air Anomaly: -2428
Min/Max Data Record:
Date: 1991 10 31
Latitude: -8.84379
Longitude: +179.99992
Bathymetry, 2- Way Traveltime: 128550
Bathymetry, Corrected Depth: 9929.0
Magnetics Total Field, 1st Sensor: 566490
Magnetics Residual Field: +07020
Free-Air Anomaly: +2090