Survey Identifier: GH771-A
Format Acronym: MGD77
Data Center File Number: J2010020
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): TOMOYUKI MORITANI
Project: BASIC STUDY ON EXPLORATION OF DEEP-SEA MINERAL RESOURCES
Funding: GEOL. SURVEY JAPAN
Survey Departure Date (yyyymmdd): 19770112
Port of Departure: FUNABASHI,JAPAN
Survey Arrival Date (yyyymmdd): 19770121
Port of Arrival: MAJURO, MARSHALL ISLANDS
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 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: BOLT 120 CU.IN. AIR GUN
Formats of Seismic Data: ANALOG RECORDS
Topmost Latitude of Survey: +34
Bottommost Latitude: +04
Leftmost Longitude: +141
Rightmost Longitude: +171
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: DGRF1975
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 -.70 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 M. JOSHIMA AND T. ISHIHARA, ADDITIONAL INFORMATION IN GSJ CRUISE REPORT NO.12 (1979), OLD NGDC:56010020
Number of Data Records: 2348
Min/Max Data Record:
Date: 1977 01 12
Latitude: +4.96953
Longitude: +141.02963
Bathymetry, 2- Way Traveltime: 019867
Bathymetry, Corrected Depth: 1480.0
Magnetics Total Field, 1st Sensor: 337290
Magnetics Residual Field: -03390
Observed Gravity: 9780445
Free-Air Anomaly: -2591
Min/Max Data Record:
Date: 1977 01 20
Latitude: +33.69036
Longitude: +170.98486
Bathymetry, 2- Way Traveltime: 084933
Bathymetry, Corrected Depth: 6439.0
Magnetics Total Field, 1st Sensor: 370240
Magnetics Residual Field: +03010
Observed Gravity: 9796616
Free-Air Anomaly: +2149