Survey Identifier: EW9104
Format Acronym: MGD77
Data Center File Number: 01210030
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19951118
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): R.LARSON
Project: JUAN FERNANDEZ MICROPLATE
Funding: NSF OCE89-17630
Survey Departure Date (yyyymmdd): 19910616
Port of Departure: PAPEETE, TAHITI
Survey Arrival Date (yyyymmdd): 19910727
Port of Arrival: VALPARAISO, CHILE
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 PDR, GLORIA SIDESCAN
Magnetics Instrumentation: VARIAN V-75 MAGNETOMETER
Gravity Instrumentation: BODENSEEWERKE KSS-30 GRAVIMETER
Additional Forms of Gravity Data: BELL BGM-3 GRAVIMETER
Seismic Instrumentation: NO SEISMIC DATA COLLECTED
Topmost Latitude of Survey: -17
Bottommost Latitude: -36
Leftmost Longitude: -150
Rightmost Longitude: -080
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 -.0107 MGAL/DAY, DC 1.5
Departure Base Station Gravity: 9786993
Departure Base Station Description: THT-N PAPEETE
Arrival Base Station Gravity: 9796325
Arrival Base Station Description: ACIC 0301-1
Additional Documentation: TIME: KINEMETRICS 468-DC, SPEED: FURUNO CI-30, HEADING: SPERRY MK-27, SCIENCE OFFICER: J.GREER COMPUTER SYSTEMS: S.OHARA, 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
Number of Data Records: 55116
Min/Max Data Record:
Date: 1991 06 16
Latitude: -35.21991
Longitude: -149.59578
Bathymetry, 2- Way Traveltime: 010700
Bathymetry, Corrected Depth: 799.0
Magnetics Total Field, 1st Sensor: 310300
Magnetics Residual Field: -05200
Free-Air Anomaly: -0504
Min/Max Data Record:
Date: 1991 07 25
Latitude: -17.45435
Longitude: -80.71030
Bathymetry, 2- Way Traveltime: 067390
Bathymetry, Corrected Depth: 5077.0
Magnetics Total Field, 1st Sensor: 384510
Magnetics Residual Field: +13250
Free-Air Anomaly: +2139