Survey Identifier: HM7302


Format Acronym: MGD77
Data Center File Number: J1030008
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19801222
Source Institution: HYDROGRAPHIC DEPT.
Country: JAPAN
Platform Name: MEIYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): SYOICHI OSIMA
Project: THE BASIC MAP OF SEA OF CONTINENTAL SHELVES
Survey Departure Date (yyyymmdd): 19730518
Port of Departure: MOJI
Survey Arrival Date (yyyymmdd): 19730621
Port of Arrival: MOJI
Navigation Instrumentation: DECCA
Geodetic Datum/Position: DECCA
Bathymetry Instrumentation: 50KHZ,BEAM-WIDTH 15-DEGREE*2
Additional Forms of Bathymetric Data: ANALOG RECORD
Magnetics Instrumentation: PROTON MAG
Additional Forms of Magnetics Data: TOTAL INTENSITY CHART 6344M,6345M
Gravity Instrumentation: TSSG-H1 SENSOR P1
Additional Forms of Gravity Data: FREE AIR ANOMALY CHART 6344G,6345G
Seismic Instrumentation: AIR GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +35
Bottommost Latitude: +33
Leftmost Longitude: +127
Rightmost Longitude: +131
General Digitizing Rate of Bathymetry: 100
General Sampling Rate of Bathymetry: 1/SECOND
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 07
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 06
Magnetic Sensor Tow Distance: 250
Reference Field Code: 03
Reference Field: DGRF
Method of Applying Residual Field: DIURNAL CORRECTIONS USING OBSERVATORY DATA
General Digitizing Rate of Gravity: 100
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM(1967)
Reference System: SYSTEM JGSN75
Corrections Applied: DRIFT,ETOVOS
Departure Base Station Gravity: 9796920
Departure Base Station Description: MOZI 33-56.4N,130-577.7E JGSN75
Arrival Base Station Gravity: 9796270
Arrival Base Station Description: KARATSU 33-27.9N,129-58.2E JGSN
Additional Documentation: CRUISE NAME:FUKUOKA OKI, OBSERVERS:K.MATSUMOTO AND Y.SOMEYA, HAKATA 33-36.2N,13024.3E 979649 MGAL JGSN 75, REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY Y.GANEKO,T.YANAGI, AND K.KUBO OF THE ASTRONOMICAL DIV,JHD. magnetics records follow bathy and mag; no times for mag OLD NGDC:56070008
Number of Data Records: 6374

Min/Max Data Record:
Date: 1973 05 24
Latitude: +33.60675
Longitude: +127.90502
Bathymetry, Corrected Depth: 33.0
Magnetics Total Field, 1st Sensor: 466400
Magnetics Residual Field: -08653
Observed Gravity: 9796000
Free-Air Anomaly: -0347

Min/Max Data Record:
Date: 1973 06 20
Latitude: +34.93975
Longitude: +130.42160
Bathymetry, Corrected Depth: 206.0
Magnetics Total Field, 1st Sensor: 494400
Magnetics Residual Field: +12485
Observed Gravity: 9797680
Free-Air Anomaly: +0667