Survey Identifier: GH824-A
Format Acronym: MGD77
Data Center File Number: J2010023
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19921016
Source Institution: GEOLOGICAL SURVEY OF JAPAN
Country: JAPAN
Platform Name: HAKUREI-MARU
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): MASATO NOHARA
Project: GEOLOGICAL STUDY OF DEEP-SEA MINERAL RESOURCES
Funding: GEOL. SURVEY JAPAN
Survey Departure Date (yyyymmdd): 19820814
Port of Departure: FUNABASHI, JAPAN
Survey Arrival Date (yyyymmdd): 19820910
Port of Arrival: APIA, WESTERN SAMOA
Navigation Instrumentation: MX1107 SATNAV
Geodetic Datum/Position: SATFIX & DEAD RECKONING
Bathymetry Instrumentation: NEC 12KHZ PDR & RAYTHEON 3.5 KHZ SBP
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: GEOMETRICS G801 PROTON PRECESSION MAG
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: LACOSTE & ROMBERG S-63 GRAVITY METER
Additional Forms of Gravity Data: ANALOG RECORDS
Seismic Instrumentation: 150 CI & 120 CI PAR AIR GUNS
Formats of Seismic Data: ANALOG RECORDS
Topmost Latitude of Survey: +34
Bottommost Latitude: -14
Leftmost Longitude: +141
Rightmost Longitude: -165
General Digitizing Rate of Bathymetry: 050
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 06
Magnetic Sensor Tow Distance: 0200
Reference Field Code: 88
Reference Field: DGRF1980
General Digitizing Rate of Gravity: 050
General Sampling Rate of Gravity: 10
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Corrections Applied: DRIFT CORRECTION 0.06 MGAL/DAY
Departure Base Station Gravity: 9797894
Departure Base Station Description: FUNABASHI, JAPAN
Arrival Base Station Gravity: 9797894
Arrival Base Station Description: FUNABASHI, JAPAN
Additional Documentation: BATHYMETRY CORRECTION ACCORDING TO CARTER'S TABLE, SAMPLING RATE OF NEC PDR IS 3/4 SEC. OR 1/8 SEC. DATA COMPILATION BY T. YAMAZAKI, EDIT BY T. ISHIHARA, ADDITIONAL INFORMATION IN GEOL. SURVEY OF JAPAN CRUISE REPORT NO.22 (1992), OLD NGDC:56010023
Number of Data Records: 7744
Min/Max Data Record:
Date: 1982 08 14
Latitude: -13.64110
Longitude: -179.99835
Bathymetry, 2- Way Traveltime: 020000
Bathymetry, Corrected Depth: 1495.0
Magnetics Total Field, 1st Sensor: 328570
Magnetics Residual Field: -13490
Observed Gravity: 9779049
Free-Air Anomaly: -2683
Min/Max Data Record:
Date: 1982 09 10
Latitude: +33.21407
Longitude: +179.98529
Bathymetry, 2- Way Traveltime: 123467
Bathymetry, Corrected Depth: 9521.0
Magnetics Total Field, 1st Sensor: 432610
Magnetics Residual Field: +04580
Observed Gravity: 9796788
Free-Air Anomaly: +1560