Survey Identifier: YAQ7305
Format Acronym: MGD77
Data Center File Number: 07010038
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. COUCH, KULM, VON HUENE
Project: NAZCA PLATE, YAQUINA LONG OCEAN CRUISE 1973 LEG 5
Funding: IDOE
Survey Departure Date (yyyymmdd): 19740104
Port of Departure: VALPARAISO, CHILE
Survey Arrival Date (yyyymmdd): 19740114
Port of Arrival: VALPARAISO, CHILE
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: TWIN 40 OR 120 CU. IN. BOLT AIRGUNS, EPC
Formats of Seismic Data: SINGLE CHANNEL ANALOG, MICROFILM
Topmost Latitude of Survey: -33
Bottommost Latitude: -40
Leftmost Longitude: -077
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 (SEE ADD DOC / 18)
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 / 19
Corrections Applied: 0.46 MGAL PER DAY DRIFT
Departure Base Station Gravity: 9805724
Departure Base Station Description: SEE ADD DOC / 20,21
Arrival Base Station Gravity: 9805724
Arrival Base Station Description: SEE ADD DOC /20,21
Additional Documentation: 12 12KHZ ALSO AT 1 SEC SWEEP (PEAKS, TROUGHS AND INGLECTIONS WERE DIGITIZED, 14 U.S. COMMERCE PIER G=980104.3, 15 VALPARISO TIED TO CORVALLIS OSU-OC BERG AND THIRUVATHUKAL, 1965, 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+.135*SIN(LAT)**2)*SIN(LAT)**2
Number of Data Records: 5593
Min/Max Data Record:
Date: 1974 01 04
Latitude: -39.69690
Longitude: -76.55140
Bathymetry, 2- Way Traveltime: 000300
Bathymetry, Corrected Depth: 22.0
Magnetics Total Field, 1st Sensor: 265170
Magnetics Residual Field: -02950
Free-Air Anomaly: -1788
Min/Max Data Record:
Date: 1974 01 14
Latitude: -33.03510
Longitude: -71.78990
Bathymetry, 2- Way Traveltime: 072000
Bathymetry, Corrected Depth: 5425.0
Magnetics Total Field, 1st Sensor: 295380
Magnetics Residual Field: +03620
Free-Air Anomaly: +0869