Survey Identifier: GH771-B
Format Acronym: MGD77
Data Center File Number: J2010021
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): 19770124
Port of Departure: MAJURO, MARSHALL ISLANDS
Survey Arrival Date (yyyymmdd): 19770213
Port of Arrival: APIA, WESTERN SAMOA
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: +12
Bottommost Latitude: -14
Leftmost Longitude: +171
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 0.00 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:56010021
Number of Data Records: 4529
Min/Max Data Record:
Date: 1977 01 24
Latitude: -13.51377
Longitude: -179.98639
Bathymetry, 2- Way Traveltime: 019733
Bathymetry, Corrected Depth: 1472.0
Magnetics Total Field, 1st Sensor: 328950
Magnetics Residual Field: -04780
Observed Gravity: 9780212
Free-Air Anomaly: -0419
Min/Max Data Record:
Date: 1977 02 12
Latitude: +11.16206
Longitude: +179.99457
Bathymetry, 2- Way Traveltime: 085200
Bathymetry, Corrected Depth: 6461.0
Magnetics Total Field, 1st Sensor: 382730
Magnetics Residual Field: +07770
Observed Gravity: 9783444
Free-Air Anomaly: +2336