Survey Identifier: GH805-B
Format Acronym: MGD77
Data Center File Number: J2010019
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19870623
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): 19800913
Port of Departure: HILO, HAWAII, U.S.A.
Survey Arrival Date (yyyymmdd): 19801008
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
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: GEOMETRICS G801 PROTON PRECESSION
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: LACOSTE & ROMBERG S-63 GRAVITY METER
Additional Forms of Gravity Data: ANALOG RECORDS
Seismic Instrumentation: TWO BOLT 120 CU.IN. AIRGUNS
Formats of Seismic Data: RAYTHEON UGR & LSR RECORDS
Topmost Latitude of Survey: +36
Bottommost Latitude: +07
Leftmost Longitude: +139
Rightmost Longitude: -154
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: PGRF1980
General Digitizing Rate of Gravity: 050
General Sampling Rate of Gravity: 10
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM (1971)
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Corrections Applied: 0.00 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 COMPILATION BY M. JOSHIMA AND T. ISHIHARA, GRAVIMETER DRIFT WAS CALCULATED FROM THE DIFFERENCE OF READINGS AT FUNABASHI, ON AUGUST 11 AND ON OCTOBER 9, 1980, OLD NGDC:56010019
Number of Data Records: 6057
Min/Max Data Record:
Date: 1980 09 13
Latitude: +7.50268
Longitude: -179.99878
Bathymetry, 2- Way Traveltime: 013867
Bathymetry, Corrected Depth: 1038.0
Magnetics Total Field, 1st Sensor: 321330
Magnetics Residual Field: -12680
Observed Gravity: 9781037
Free-Air Anomaly: -2772
Min/Max Data Record:
Date: 1980 10 08
Latitude: +35.57921
Longitude: +179.98315
Bathymetry, 2- Way Traveltime: 133320
Bathymetry, Corrected Depth: 9999.0
Magnetics Total Field, 1st Sensor: 448680
Magnetics Residual Field: +11610
Observed Gravity: 9798182
Free-Air Anomaly: +2026