Survey Identifier: EW9105
Format Acronym: MGD77
Data Center File Number: 01210016
Parameters Surveyed Code: 55511
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): J.COCHRAN
Project: SOUTHERN EAST PACIFIC RISE / WILKES TRANSFORM
Funding: NSF OCE89-11376
Survey Departure Date (yyyymmdd): 19910804
Port of Departure: VALPARAISO, CHILE
Survey Arrival Date (yyyymmdd): 19910911
Port of Arrival: EASTER ISLAND, 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
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: -06
Bottommost Latitude: -28
Leftmost Longitude: -113
Rightmost Longitude: -079
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 1.05
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, SCIENCE OFFICER: J.STENNETT; COMPUTER SYSTEMS: S.OHARA; DATA REDUCED BY LDEO, MARINE OFFICE DATA REDUCTION GROUP; ORIGINAL RECORDS ARCHIVED AT LDEO, CONTACT LDEO MG&G ARCHIVIST WITH QUESTIONS/PROBLEMS: MGGDB@LDEO.COLUMBIA.EDU, NGDC HAS MULTIBEAM BATHYMETRIC DATA FOR THIS CRUISE.
Number of Data Records: 63540
Min/Max Data Record:
Date: 1991 08 04
Latitude: -27.46909
Longitude: -112.41455
Bathymetry, 2- Way Traveltime: 002230
Bathymetry, Corrected Depth: 168.0
Magnetics Total Field, 1st Sensor: 268180
Magnetics Residual Field: -08300
Free-Air Anomaly: -0458
Min/Max Data Record:
Date: 1991 09 17
Latitude: -6.61569
Longitude: -79.68620
Bathymetry, 2- Way Traveltime: 070260
Bathymetry, Corrected Depth: 5296.0
Magnetics Total Field, 1st Sensor: 315910
Magnetics Residual Field: +05070
Free-Air Anomaly: +1712