Survey Identifier: WEST01MV


Format Acronym: MGD77
Data Center File Number: 15020148
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 20031009
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V MELVILLE
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): URABE,T. (GEOL. SURV. JAPAN)
Project: WESTWARD LEG 1 (RIDGE FLUX PROJECT-MELVILLE)
Funding: NSF
Survey Departure Date (yyyymmdd): 19931123
Port of Departure: SAN DIEGO, CALIFORNIA
Survey Arrival Date (yyyymmdd): 19931230
Port of Arrival: PAPEETE, TAHITI
Navigation Instrumentation: GPS,TRIMBLE MOD. 4000AX
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM 2000 w/ SIDESCAN
Additional Forms of Bathymetric Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS MAGNETOMETER MOD-G 801/3
Additional Forms of Magnetics Data: ANAL.REC, 35MM FILM, DIGITAL TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL TAPE
Seismic Instrumentation: NONE COLLECTED
Topmost Latitude of Survey: 32
Bottommost Latitude: -19
Leftmost Longitude: -150
Rightmost Longitude: -111
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
Interpolation Scheme: 1 MINUTE VALUES EXTRACTED FROM SEABEAM VERTICAL BEAM
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF-1990
Method of Applying Residual Field: LIN.INTERP.POINTS WITHIN ONE DEGREE SQUARE
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 01
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Corrections Applied: EOTVOS AND METER DRIFT
Departure Base Station Gravity: 9795355
Departure Base Station Description: SIO MARFAC PIER, SAN DIEGO
Arrival Base Station Gravity: 9786989
Arrival Base Station Description: DOD 2080-9 PAPEETE,TAHITI
Additional Documentation: PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY, DEPTHS CORRECTED FOR 5 METER SHIP DRAFT; NAVIGATION: DR BETWEEN 1 MINUTE, INTERVAL GPS FIXES; GRAVITY: 1 SEC METER COUNTS FILTERED WITH 99 DEC STD.DEV. GAUSSIAN. CONVOLUTION WINDOW. FREE AIR ANOMALY SPIKES PRESENT BECAUSE SAME, FILTER NOT USED FOR NAVIGATION. FOLLOWING INFO FROM MULTIBEAM BATHYMETRY:, Heading Sensor Sperry MK 23 Gyro; Vertical reference unit sensor Datawell, Hippy Model 120; Uncorrected meters, 1500m/sec; Surface sound velocity sensor.
Number of Data Records: 52728

Min/Max Data Record:
Date: 1993 11 24
Latitude: -18.72271
Longitude: -149.60783
Bathymetry, 2- Way Traveltime: 009920
Bathymetry, Corrected Depth: 741.0
Magnetics Total Field, 1st Sensor: 300040
Magnetics Residual Field: -04447
Observed Gravity: 9779971
Free-Air Anomaly: -0597

Min/Max Data Record:
Date: 1993 12 30
Latitude: +31.52055
Longitude: -111.74780
Bathymetry, 2- Way Traveltime: 065093
Bathymetry, Corrected Depth: 4897.0
Magnetics Total Field, 1st Sensor: 434200
Magnetics Residual Field: +04655
Observed Gravity: 9789714
Free-Air Anomaly: +1428