USGS CMG L-1-76-MX Metadata

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

MCG Data Collection ID ---         L176MX
Institution Data Collection ID --- L176MX
NGDC ID ---                        06050056
Funding ---                        (unspecified)
Project, Cruise & Leg ---          (unspecified)
Study region ---                   +38.00000,+20.00000,-123.00000,-106.00000
Chief Scientist(s) ---             JIM BISCHOFF,BILL NORMARK,J.HEIN
Name of vessel ---                 Lee (surface ship)
Date field data collection started --- 01/06/76     LV E DK PRUDHOE BAY
Date field data collection ended ---   02/17/76     LA PAZ, MEXICO
Parameters surveyed ---
   Bathymetry:                     surveyed, contained in data file
   Magnetics:                      (unspecified)
   Gravity:                        (unspecified)
   High-resolution seismics:       (unspecified)
   Deep penetration seismics:      (unspecified)
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 ---     04/15/87
Contributing institution ---       USGS Branch of Pacific Marine Geology
Country ---                        United States

Navigation instrumentation ---     SATNAV,LORAN-A,DOPPLER SONAR
Position determination method ---  PRIM-SATNAV, SEC-LORAN-A

Bathymetry instrumentation ---            3.5 KHZ WIDE 1 SEC
Additional forms of bathymetric data ---  RECORDER ROLLS
General rate of bathymetry in file ---    40.2 minutes
General collection rate of bathymetry --- 20/SECONDS
Assumed sound velocity ---                1463.0 m/sec
Bathymetric datum code ---                No correction applied (sea level)
Bathmetry interpolation scheme ---        (unspecified)

Magnetics instrumentation ---            PROTON PRECESSION MAG-GEOMETRICS G-801
Additional forms of magnetics data ---   ANALOG RECORDS
General rate of magnetics in file ---    (unspecified)
General collection rate of magnetics --- 4 seconds
Magnetic sensor tow distance ---         213 meters
Magnetic sensor depth ---                (unspecified)
Two sensor horizontal separation ---     (unspecified)
Residual magnetics reference field ---   IGRF-75
Method of applying residual field ---    LINEAR INTERP. BETWEEN NAV POINTS

Gravity instrumentation ---            (unspecified)
Additional forms of gravity data ---   (unspecified)
General rate of gravity in file ---    (unspecified)
General collection rate of gravity --- (unspecified)
Theoretical gravity formula ---        (unspecified)
Reference system ---                   (unspecified)
Corrections applied ---                (unspecified)
Starting land tie ---                  (unspecified)
Ending land tie   ---                  (unspecified)

Seismic instrumentation --- MINISPARKER,UNIBOOM,SINGLE CHANNEL ARCER
Formats of seismic data --- RECORDER ROLLS

Moore, J.G., Normark, W.R., Hess, G.R., and Meyer, C.E., 1977, Petrology of basalt from the
East Pacific Rise near 21 degrees North latitude: Journal of Research of the 
U.S. Geological
Survey, v. 5, no. 6, p. 753-759.


Hein, J.R., and Yeh, H.W., 1979, Some effects of hydrothermal activity at the 
intersection of
spreading centers and fracture zones in the Gulf of California: Geological Society of America
Abstracts with Programs, v. 11, no. 7, p. 442. 


Bischoff, J.L., and Niemitz, J.W., 1980, Bathymetric maps of the Gulf of 
California:
U.S. Geological Survey Miscellaneous Investigations Series I-1244, 4 sheets.


Niemitz, Jeffery W., and Bischoff, James L., 1981, Tectonic elements of the 
southern part
of the Gulf of California: Geological Society of America Bulletin, v. 92, no. 3,
p. I 101-I 104, II 360-II 407.