Survey Identifier: GH814-B
Format Acronym: MGD77
Data Center File Number: J2010026
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): SEIZO NAKAO
Project: GEOLOGICAL STUDY OF DEEP-SEA MINERAL RESOURCES
Funding: GEOL. SURVEY JAPAN
Survey Departure Date (yyyymmdd): 19810916
Port of Departure: PAGO PAGO, AMERICAN SAMOA
Survey Arrival Date (yyyymmdd): 19811012
Port of Arrival: FUNABASHI, JAPAN
Navigation Instrumentation: MX-702 SATNAV
Geodetic Datum/Position: SATFIX & DEAD RECKONING
Bathymetry Instrumentation: NEC 12KHZ PDR & RAYTHEON 3.5 KHZ SBP
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 PAR AIR GUN & 80 CI T-WATER GUN
Formats of Seismic Data: ANALOG RECORDS
Topmost Latitude of Survey: +35
Bottommost Latitude: -15
Leftmost Longitude: +140
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 0.02 MGAL/DAY
Departure Base Station Gravity: 9797889
Departure Base Station Description: FUNABASHI, JAPAN
Arrival Base Station Gravity: 9797889
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 COLLECTED AND COMPILED BY T. ISHIHARA & T. YAMAZAKI, ADDITIONAL INFORMATION IN GEOLOGICAL SURVEY JAPAN CRUISE REPORT NO.21 (1986), OLD NGDC:56010026
Number of Data Records: 6384
Min/Max Data Record:
Date: 1981 09 17
Latitude: -14.35137
Longitude: -179.98767
Bathymetry, 2- Way Traveltime: 000640
Bathymetry, Corrected Depth: 49.0
Magnetics Total Field, 1st Sensor: 330540
Magnetics Residual Field: -09490
Observed Gravity: 9779658
Free-Air Anomaly: -3144
Min/Max Data Record:
Date: 1981 10 11
Latitude: +34.44493
Longitude: +179.99435
Bathymetry, 2- Way Traveltime: 119680
Bathymetry, Corrected Depth: 9213.0
Magnetics Total Field, 1st Sensor: 448800
Magnetics Residual Field: +04890
Observed Gravity: 9797487
Free-Air Anomaly: +2342