Survey Identifier: HM7003
Format Acronym: MGD77
Data Center File Number: J1030004
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): YOSHIRO IWABUCHI
Project: THE BASIC MAP OF SEA OF CONTINENTAL SHELVES
Survey Departure Date (yyyymmdd): 19700818
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19700928
Port of Arrival: TOKYO
Navigation Instrumentation: LORAN A.2S1,2S2,2H7 LORAN C.SS3-W.SS3-X
Geodetic Datum/Position: LORAN.A.2S1,2S2,2H7 LORAN C.SS3-W
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 6370M
Gravity Instrumentation: TSSG-H1,SENSOR:P1
Additional Forms of Gravity Data: FREE AIR ANOMALY CHART 6370G
Seismic Instrumentation: AIR GUN
Formats of Seismic Data: ANALOG RECORD
Topmost Latitude of Survey: +40
Bottommost Latitude: +38
Leftmost Longitude: +141
Rightmost Longitude: +145
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: IGRF-65
Method of Applying Residual Field: DIURNAL CORRECTION USING DATA OF OBSERVATORY
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: 9801470
Departure Base Station Description: SIOGANA 38-18.9N,141-03.6E
Arrival Base Station Gravity: 9802110
Arrival Base Station Description: KESENNUMA 38-53.4N,141-35.4E
Additional Documentation: CRUISE NAME:SANRIKU OKI NANBU, OBSERVER:Y.YANAGI AND S.TAKEUCHI, KAMAISI :980261 MGAL, REDUCTION AND COMPILATION OF GRAVITY DATA HAVE BEEN MADE BY T.TAKEMURA, T.YANAGI AND S.NISHIYA OF THE ASTRONOMICAL DIV. CONVERSION POTSDAM INTO IGSN, 71 HAS CARRIED OUT BY Y.GANEKO. magnetics records follow bathy and grav. no times for mag OLD NGDC:56070004
Number of Data Records: 6651
Min/Max Data Record:
Date: 1970 09 19
Latitude: +38.03453
Longitude: +141.09135
Bathymetry, Corrected Depth: 25.0
Magnetics Total Field, 1st Sensor: 458200
Magnetics Residual Field: -05096
Observed Gravity: 9798422
Free-Air Anomaly: -1751
Min/Max Data Record:
Date: 1970 10 03
Latitude: +39.25491
Longitude: +144.63668
Bathymetry, Corrected Depth: 8595.0
Magnetics Total Field, 1st Sensor: 475600
Magnetics Residual Field: +04470
Observed Gravity: 9807032
Free-Air Anomaly: +6469