Survey Identifier: C1218
Format Acronym: MGD77
Data Center File Number: 01010073
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19890706
Source Institution: LAMONT-DOHERTY GEOLOGICAL OBSERVATORY
Country: USA
Platform Name: ROBERT D. CONRAD
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): M. EWING
Project: CRUISE 12, LEG 18
Survey Departure Date (yyyymmdd): 19690623
Port of Departure: SASEBO, JAPAN
Survey Arrival Date (yyyymmdd): 19690706
Port of Arrival: HAKODATE, JAPAN
Navigation Instrumentation: SATELLITE
Geodetic Datum/Position: SATELLITE/ DEAD RECKONING
Bathymetry Instrumentation: (SEE ADD DOC / 18)
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: L-DGO MFG PROTON-PRECESSION
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: ANSCHUTZ ELECTRICTABLE, ASKANIA GSS2-6
Additional Forms of Gravity Data: ANALOG RECORDS
Seismic Instrumentation: L-DGO 25CU-IN-AIRGUN,EEL,DRUM RECORDER
Formats of Seismic Data: TWO, 2 CHANNEL SHEET RECORDS
Topmost Latitude of Survey: +42
Bottommost Latitude: +33
Leftmost Longitude: +128
Rightmost Longitude: +141
General Digitizing Rate of Bathymetry: 060
General Sampling Rate of Bathymetry: ONE SECOND
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: NONE
General Digitizing Rate of Magnetics: 41
Reference Field Code: 03
Reference Field: IGRF-65
Method of Applying Residual Field: LINEAR INTERPOLATION BETWEEN TWO NAV PTS
General Digitizing Rate of Gravity: 41
Theoretical Gravity Formula Code: 2
Theoretical Gravity Formula: INTERNAT'L 1930
Reference System Code: 2
Reference System: POTSDAM SYSTEM
Additional Documentation: 06 -3.5 AND 12 KHZ, WIDE BEAM (60 DEG), 1 SECOND SWEEP
Number of Data Records: 4311
Min/Max Data Record:
Date: 1969 06 23
Latitude: +33.26350
Longitude: +128.67830
Bathymetry, 2- Way Traveltime: 001025
Bathymetry, Corrected Depth: 77.0
Magnetics Total Field, 1st Sensor: 473630
Magnetics Residual Field: -06010
Free-Air Anomaly: -0368
Min/Max Data Record:
Date: 1969 07 06
Latitude: +41.35470
Longitude: +140.33360
Bathymetry, 2- Way Traveltime: 047875
Bathymetry, Corrected Depth: 3539.0
Magnetics Total Field, 1st Sensor: 506030
Magnetics Residual Field: +02960
Free-Air Anomaly: +0810