Survey Identifier: YAQ7307


Format Acronym: MGD77
Data Center File Number: 07010040
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19741212
Source Institution: OREGON STATE UNIVERSITY
Country: U.S.A., PERU
Platform Name: YAQUINA
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DR. STEPHEN JOHNSON
Project: NAZCA PLATE, YAQUINA LONG OCEAN CRUISE 1973 LEG 7
Funding: IDOE
Survey Departure Date (yyyymmdd): 19740217
Port of Departure: CALLAO, PERU
Survey Arrival Date (yyyymmdd): 19740314
Port of Arrival: CALLAO, PERU
Navigation Instrumentation: SATELLITE
Geodetic Datum/Position: SATELLITE, DEAD RECKONING
Bathymetry Instrumentation: 12 AND 3.5 KHZ WIDE BEAM (60 DEG)
Additional Forms of Bathymetric Data: ANALOG RECORDS, MICROFILM
Magnetics Instrumentation: GEOMETRICS G801/3 PROTON PRECESSION
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: LACOSTE AND ROMBERG AIR-SEA S-42
Additional Forms of Gravity Data: ANALOG RECORDS
Seismic Instrumentation: 40 AND 120 CU. IN. AIRGUNS
Formats of Seismic Data: SINGLE CHANNEL ANALOG, MICROFILM
Topmost Latitude of Survey: -12
Bottommost Latitude: -20
Leftmost Longitude: -081
Rightmost Longitude: -071
General Digitizing Rate of Bathymetry: 050
General Sampling Rate of Bathymetry: 2 SEC SWEEP
Assumed Sound Velocity: 14300
Bathymetric Datum Code: 00
Interpolation Scheme: NONE (PEAKS, TROUGHS AND INFLECTIONS DIGITIZED)
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 03
Magnetic Sensor Tow Distance: 215
Sensor Depth: 30
Reference Field Code: 03
Reference Field: IGRF-65
Method of Applying Residual Field: LINEAR INTERPOLATION BETWEEN NAVIGATION POINTS
General Digitizing Rate of Gravity: 050
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM (1967)
Reference System: SEE ADD DOC / 18
Corrections Applied: 0.04 MGAL PER DAY DRIFT
Departure Base Station Gravity: 9783127
Departure Base Station Description: (SEE ADD DOC /19,20) WH1068
Arrival Base Station Gravity: 9783127
Arrival Base Station Description: WH1068 (SEE ADD DOC /19,20)
Additional Documentation: 14 U.S. COMMERCE PIER G=980104.3, 15 WH 1068 WOOLARD AND ROSE 1963 PG 121, 15 GRAVITY ANOMALIES CALCULATED ORIGINALLY RELATIVE TO COMM PIER G=980118.8, 15 AND 1930 THEO FORMULA THEN ADJUSTED TO NEW COMM PIER VALUE AND IAG 1967, 15 USING DELTA G(MGAL)=2.65+(-13.695+0.135*SIN(LAT)**2)*SIN(LAT)**2, 09 TWO SHIP SEISMIC REFRACTION + WIDE ANGLE REFLECTION ALSO COLLECTED
Number of Data Records: 13465

Min/Max Data Record:
Date: 1974 02 17
Latitude: -19.75070
Longitude: -80.31130
Bathymetry, 2- Way Traveltime: 000200
Bathymetry, Corrected Depth: 15.0
Magnetics Total Field, 1st Sensor: 259390
Magnetics Residual Field: -03850
Free-Air Anomaly: -2242

Min/Max Data Record:
Date: 1974 03 14
Latitude: -12.06680
Longitude: -71.93770
Bathymetry, 2- Way Traveltime: 096200
Bathymetry, Corrected Depth: 7319.0
Magnetics Total Field, 1st Sensor: 278820
Magnetics Residual Field: +03610
Free-Air Anomaly: +0401