Survey Identifier: YAQ7306


Format Acronym: MGD77
Data Center File Number: 07010039
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19750102
Source Institution: OREGON STATE UNIVERSITY
Country: U.S.A., CHILE
Platform Name: YAQUINA
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DRS. R. BLAKELY, R. PRINCE
Project: NAZCA PLATE, YAQUINA LONG OCEAN CRUISE 1973 LEG 6
Funding: IDOE
Survey Departure Date (yyyymmdd): 19740119
Port of Departure: VALPARAISO, CHILE
Survey Arrival Date (yyyymmdd): 19740210
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: TWO BOLT 40 CU IN AIRGUNS,EEL,EPC RECORD
Formats of Seismic Data: SINGLE CHANNEL ANALOG, MICROFILM
Topmost Latitude of Survey: -12
Bottommost Latitude: -35
Leftmost Longitude: -078
Rightmost Longitude: -070
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: .20 MGAL PER DAY DRIFT
Departure Base Station Gravity: 9805724
Departure Base Station Description: SEE ADD DOC / 19,21
Arrival Base Station Gravity: 9783127
Arrival Base Station Description: WH1068 (SEE ADD DOC/20,21)
Additional Documentation: 14 U.S. COMMERCE PIER G=980104.3, 15 VALPARISO TIED TO CORVALLIS OSU-OC BERG AND THIRUVATHUKAL, 1965, 15 WH1068 WOOLLARD 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 1AG 1967, 15 USING DELTA G(MGAL)=2.65+(-12.695+.135*SIN(LAT)**2)*SIN(LAT)**2
Number of Data Records: 8927

Min/Max Data Record:
Date: 1974 01 19
Latitude: -34.54810
Longitude: -77.26240
Bathymetry, 2- Way Traveltime: 000400
Bathymetry, Corrected Depth: 30.0
Magnetics Total Field, 1st Sensor: 251610
Magnetics Residual Field: -04070
Free-Air Anomaly: -2527

Min/Max Data Record:
Date: 1974 02 10
Latitude: -12.24740
Longitude: -70.43930
Bathymetry, 2- Way Traveltime: 105275
Bathymetry, Corrected Depth: 8041.0
Magnetics Total Field, 1st Sensor: 277020
Magnetics Residual Field: +07310
Free-Air Anomaly: +0873