USGS CMG W-6-88-NP Metadata

Scripps Institution of Oceanography

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DATA COLLECTION OVERVIEW  (use NGDC GEODAS CD to retrieve data)

MCG Data Collection ID ---         W688NP
Institution Data Collection ID --- RNDB06WT
NGDC ID ---                        15040182
Funding ---                        (unspecified)
Project, Cruise & Leg ---          ROUNDABOUT LEG 6
Study region ---                   +55.00000,+48.00000,+164.00000,-166.00000
Chief Scientist(s) ---             P. LONSDALE, L. KEIGWIN
Name of vessel ---                 R/V T.WASHINGTON (surface ship)
Date field data collection started --- 08/05/88     DUTCH HARBOR, ALASKA
Date field data collection ended ---   09/05/88     DUTCH HARBOR, ALASKA
Parameters surveyed ---
   Bathymetry:                     surveyed, contained in data file
   Magnetics:                      surveyed, contained in data file
   Gravity:                        (unspecified)
   High-resolution seismics:       surveyed, but not contained in data file
   Deep penetration seismics:      surveyed, but not contained in data file
Format --- 

(I1,A8,F5.2,4I2,F5.3,F8.5,F9.5,I1,F6.4,F6.1,I2,i1,3F6.1,I1,F5.1,F6.0,F7.1,F6.1,F5.1,A8,4I1)
Date of data input to NGDC ---     00/00/00
Contributing institution ---       SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country ---                        USA

Navigation instrumentation ---     SATNAV/GPS,AUTO LOG GYRO+2D DOPPLER SPD
Position determination method ---  LINEAR INTERP.BETWEEN ADJACENT FIXES

Bathymetry instrumentation ---            SEABEAM VERTICAL BEAM (2&2/3 DEG)& 3.5
Additional forms of bathymetric data ---  ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
General rate of bathymetry in file ---    1.0 minutes
General collection rate of bathymetry --- 1PING IN H2O
Assumed sound velocity ---                1500.0 m/sec
Bathymetric datum code ---                No correction applied (sea level)
Bathmetry interpolation scheme ---        1 MINUTE AVERAGES EXTRACTED FROM 
SEABEAM VERTICAL BEAMS

Magnetics instrumentation ---            GEOMETRICS MAGNETOMETER MOD G-801/3
Additional forms of magnetics data ---   ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
General rate of magnetics in file ---    1.0 minutes
General collection rate of magnetics --- 6 seconds
Magnetic sensor tow distance ---         (unspecified)
Magnetic sensor depth ---                (unspecified)
Two sensor horizontal separation ---     (unspecified)
Residual magnetics reference field ---   IGRF-65
Method of applying residual field ---    LIN.INTERP.POINTS WITHIN ONE DEGREE 
SQUARE

Gravity instrumentation ---            BELL BGM-3 METER
Additional forms of gravity data ---   DIGITAL MAG TAPE
General rate of gravity in file ---    1.0 minutes
General collection rate of gravity --- 1 seconds
Theoretical gravity formula ---        IAG System 1967
Reference system ---                   System IGSN 71
Corrections applied ---                EOTVOS AND METER DRIFT
Starting land tie ---                  981538.4  DOD 2178-0 DUTCH HARBOR
Ending land tie   ---                  981538.4  DOD 2178-0 DUTCH HARBOR

Seismic instrumentation --- 80 CU IN H2O & 1900C-BOLT AIRGUN
Formats of seismic data --- ANAL.REC.,35MM FILM,DIGITAL MAG TAPE

Notes ---
PROCESSED BY GEOLOGICAL DATA CENTER, SCRIPPS INSTITUTION OF OCEANOGRAPHY
GRAVITY PROCESSED IN NOVEMBER 1989