Survey Identifier: EW9210


Format Acronym: MGD77
Data Center File Number: 01210049
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19961104
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.C.SEMPERE, M.PURDY, D.TOOMEY
Project: FARA / MID-ATLANTIC RIDGE
Funding: NSF OCE90-17975
Survey Departure Date (yyyymmdd): 19920930
Port of Departure: BRIDGETOWN, BARBADOS
Survey Arrival Date (yyyymmdd): 19921109
Port of Arrival: ST. GEORGE, BERMUDA
Navigation Instrumentation: MAGNAVOX MX-1107RS, T-SET & MX-4200 GPS
Geodetic Datum/Position: GPS/TRANSIT FIXES + SPEED/HEADING
Bathymetry Instrumentation: ATLAS HYDROSWEEP-DS MULTIBEAM SONAR
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: +36
Bottommost Latitude: +13
Leftmost Longitude: -065
Rightmost Longitude: -036
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 .086 MGAL/DAY, DC 4.7
Departure Base Station Gravity: 9782944
Departure Base Station Description: ACIC 0865-4
Arrival Base Station Gravity: 9798214
Arrival Base Station Description: BERMUDA BIO STATION
Additional Documentation: TIME: KINEMETRICS GPS-DC, SPEED: FURUNO CI-30, HEADING: SPERRY MK-27, OTHER DATA: OBS, SCIENCE OFFICER: J.STENNETT 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
Number of Data Records: 59104

Min/Max Data Record:
Date: 1992 09 29
Latitude: +13.10397
Longitude: -64.68275
Bathymetry, 2- Way Traveltime: 000190
Bathymetry, Corrected Depth: 14.0
Magnetics Total Field, 1st Sensor: 366930
Magnetics Residual Field: -15840
Free-Air Anomaly: -0987

Min/Max Data Record:
Date: 1992 11 09
Latitude: +35.05464
Longitude: -36.28083
Bathymetry, 2- Way Traveltime: 077850
Bathymetry, Corrected Depth: 5905.0
Magnetics Total Field, 1st Sensor: 474800
Magnetics Residual Field: +00590
Free-Air Anomaly: +3192