Survey Identifier: DSDP20GC
Format Acronym: MGD77
Data Center File Number: 15050018
Parameters Surveyed Code: 55113
File Creation Date (yyyymmdd): 19791122
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: D/V GLOMAR CHALLENGER
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): HEEZEN B.C.,MACGREGOR I.
Project: DEEPSEA DRILL.LG 20 <NSF>
Survey Departure Date (yyyymmdd): 19710917
Port of Departure: YOKOHAMA,JAPAN
Survey Arrival Date (yyyymmdd): 19711110
Port of Arrival: SUVA,FIJI
Navigation Instrumentation: SATNAV,MANUAL ENTRY GYRO AND SPD CHANGES
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: 12KHZ/GIFFT RECORDER/WIDE(60DEG)BEAM
Additional Forms of Bathymetric Data: ANAL.RECORDS,CARDS,35MMFILM
Magnetics Instrumentation: VARIAN MFD PROTON PRECESSION MOD 4970
Additional Forms of Magnetics Data: ANAL.RECORDS,CARDS,35MMFILM
Gravity Instrumentation: NONE COLLECTED
Seismic Instrumentation: 20TO300CU.IN.AIRGUN,10-300HZ,EDO PSR REC
Formats of Seismic Data: ANAL.RECORDS,35MM MICROFILM
Topmost Latitude of Survey: +35
Bottommost Latitude: -19
Leftmost Longitude: +139
Rightmost Longitude: +179
General Digitizing Rate of Bathymetry: 050
General Sampling Rate of Bathymetry: 1SECONDSWEEP
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: 5 MINUTE INTERVAL
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF 1965
Method of Applying Residual Field: LIN.INTERP.AT 30DEG C/C OR 500MI ALONG TRACK
Additional Documentation: *TIME*NAV AND RECORDS ORIGINALLY IN LOCAL TZ. DIGITIZED DATA CONVERTED TO GMT.
Number of Data Records: 6794
Min/Max Data Record:
Date: 1971 09 17
Latitude: -18.62770
Longitude: +139.70240
Bathymetry, 2- Way Traveltime: 000500
Bathymetry, Corrected Depth: 38.0
Magnetics Total Field, 1st Sensor: 338500
Magnetics Residual Field: -08000
Min/Max Data Record:
Date: 1971 11 09
Latitude: +34.86680
Longitude: +178.35740
Bathymetry, 2- Way Traveltime: 099500
Bathymetry, Corrected Depth: 7592.0
Magnetics Total Field, 1st Sensor: 450450
Magnetics Residual Field: +15800