Survey Identifier: HS7703
Format Acronym: MGD77
Data Center File Number: J1020014
Parameters Surveyed Code: 55513
File Creation Date (yyyymmdd): 19810220
Source Institution: HYDROGRAPHIC DEPARTMENT
Country: JAPAN
Platform Name: SHOYO
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): TAKUZI OGINO
Funding: HYDROGRAPHIC DEP
Survey Departure Date (yyyymmdd): 19770618
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19770727
Port of Arrival: TOKYO
Navigation Instrumentation: LORAN-A 2H7.2S2,LORAN-C 9970-X.W,NNSS
Geodetic Datum/Position: LORAN-A 2H7.2S2,LORAN-C 9970-X.W,NNSS
Bathymetry Instrumentation: 50KHZ,BEAM-WIDTH 15-DEGREE*2
Magnetics Instrumentation: PROTON MAG
Gravity Instrumentation: TSSG-H3 SENSOR:P3
Seismic Instrumentation: AIR-GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +37
Bottommost Latitude: +35
Leftmost Longitude: +140
Rightmost Longitude: +144
General Digitizing Rate of Bathymetry: 081
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 0250
Reference Field Code: 03
Reference Field: DGRF
Method of Applying Residual Field: DIURNAL CORRECTION USING DATA OF OBSERVATORY
General Digitizing Rate of Gravity: 080
Additional Documentation: CRUISE NAME:ISIKAWA OKI, OBSERVER:T.YANAGI(GRAVITY), TOTAL MAG INTENSITY SECULAR CHANGE COEFFICIENTS ARE DETERMINED LOCALLY. *magnetics records follow bathy,grav and have no times. REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY Y.GANEKO,Y.HARADA, AND Y.KOMATSU OF THE ASTRONOMICAL DIVISION. OLD NGDC:56080014
Number of Data Records: 11306
Min/Max Data Record:
Date: 1977 06 18
Latitude: +35.69612
Longitude: +140.37450
Bathymetry, Corrected Depth: 37.0
Magnetics Total Field, 1st Sensor: 443400
Magnetics Residual Field: -07647
Observed Gravity: 9795608
Free-Air Anomaly: -2998
Min/Max Data Record:
Date: 1977 07 23
Latitude: +36.95150
Longitude: +143.90000
Bathymetry, Corrected Depth: 8130.0
Magnetics Total Field, 1st Sensor: 465300
Magnetics Residual Field: +08791
Observed Gravity: 9799948
Free-Air Anomaly: +1015