Survey Identifier: Y7302MG
Format Acronym: MGD77
Data Center File Number: 07010036
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19741126
Source Institution: OREGON STATE UNIVERSITY
Country: U.S.A.
Platform Name: YAQUINA
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): DRS. M. GEMPERLE, D. JOHNSON
Project: YAQ7302 NAZCA PLATE, YQUINA LONG OCEAN CRUISE 1973 LEG 2
Funding: ONR, IDOE
Survey Departure Date (yyyymmdd): 19730920
Port of Departure: SAN DIEGO, CALIFORNIA
Survey Arrival Date (yyyymmdd): 19731004
Port of Arrival: PUNTARENAS, COSTA RICA
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 400 CU. IN. AIRGUNS, EPC
Formats of Seismic Data: SINGLE CHANNEL ANALOG, MICROFILM
Topmost Latitude of Survey: +33
Bottommost Latitude: +09
Leftmost Longitude: -118
Rightmost Longitude: -085
General Digitizing Rate of Bathymetry: 050
General Sampling Rate of Bathymetry: 1 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: NONE
Departure Base Station Gravity: 9795336
Departure Base Station Description: SEE ADD DOC /19,20 WA453
Additional Documentation: 14 U.S. COMMERCE PIER G=980104.3, 15 WA 453 WOOLLARD AND ROSE, 1963, PG 94, 15 GRAVITY ANOMALIES CALCULATED ORIGINALLLY 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: 4393
Min/Max Data Record:
Date: 1973 09 20
Latitude: +9.49480
Longitude: -117.75090
Bathymetry, 2- Way Traveltime: 005725
Bathymetry, Corrected Depth: 431.0
Magnetics Total Field, 1st Sensor: 377160
Magnetics Residual Field: -03200
Free-Air Anomaly: -0527
Min/Max Data Record:
Date: 1973 10 04
Latitude: +32.06520
Longitude: -85.02590
Bathymetry, 2- Way Traveltime: 059050
Bathymetry, Corrected Depth: 4433.0
Magnetics Total Field, 1st Sensor: 488770
Magnetics Residual Field: +04880
Free-Air Anomaly: +0676