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USGS CMG C-1-88-SP Metadata Skip navigational links Search InfoBank     Activities: by ID   by Platform   by Year   by Region   by Participant   by Organization   by Project/Theme   with Incomplete IDs   Disclaimer   Activity First Letter: A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   0   1   2   3   4   5   6   7   8   9   Virtual Globes: Atlas  (GE)    Samples  (GE)    Illuminate Oceans  (GE)    Earthquakes  (GE)    Get GE    InfoBank examples    State Waters C-1-88-SP links... Metadata & Data: Bathymetry   Gravity   Magnetics   Metadata   Navigation   bath (GE GM)   grav (GE GM)   mag (GE GM)   nav (GE GM)   times (GE GM)   Formal Metadata: Frequently-Anticipated Questions   Outline   Parseable Text   XML       Metadata ID C-1-88-SP Also Known As RC2901 Abstract Chief Scientists: Steven Cande, Stephen Lewis. Geophysical data (transitsatellite, GPS, magnetics, gravity) of field activity C-1-88-SP in Off Chile, Central Pacific from 01/07/1988 to 02/10/1988 Chief Scientist Steven Cande Stephen Lewis Activity Type Geophysical Platform Robert D. Conrad Area of Operation Off Chile, Central Pacific Location map Bounding Coordinates -32.95733 -76.76087     -70.82263 -53.92482 Dates 01/07/1988 (JD 007) to 02/10/1988 (JD 041) Analog Materials No analog holdings. Index map Crew Steven Cande Chief Scientist Stephen Lewis Chief Scientist Equipment Used transitsatellite GPS magnetics gravity Purpose The main focus of RC2901 was a geophysical study of the interaction between the Chilean ridge and trench. The inner trench slope accretionary processes and the extent of the continental crust were of particular interest. Multichannel seismic surveys were conducted in four areas: 35 -40 S were surveyed as a subcontract for the Chilean oil company, ENAP; three areas at 44 30'S, 46 S, and 48 S were surveyed as possible ODP drilling sites. Magnetics, gravity and Sea Beam were run at all times during these surveys. An intensive seven day Sea Beam survey was conducted from 45 30'S to 47 S in the area where the Chile trench is actively subducting a segment of the Chilean ridge. Single channel seismic, magnetics and gravity data were also collected during the survey. Notes Lamont-Doherty Geological Observatory NGDC Overview ! Converted to time format with year at start. ! DATA COLLECTION OVERVIEW (use NGDC GEODAS CD to retrieve data) MCG Data Collection ID --- C188SP Institution Data Collection ID --- C2901 NGDC ID --- 01010288 Funding --- (unspecified) Project, Cruise & Leg --- (unspecified) Study region --- -32.00000,-54.00000, -77.00000, -70.00000 Chief Scientist(s) --- STEVEN CANDE, STEPHEN LEWIS Name of vessel --- R/V Robert D. Conrad (surface ship) Date field data collection started --- 01/07/88 VALPARAISO, CHILE Date field data collection ended --- 02/10/88 PUNTA ARENAS, CHILE Parameters surveyed --- Bathymetry: surveyed, contained in data file Magnetics: surveyed, contained in data file Gravity: surveyed, contained in data file High-resolution seismics: not surveyed 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 --- 02/18/90 Contributing institution --- Lamont-Doherty Geological Observatory Country --- United States of A Navigation instrumentation --- FURUNO,TRANSIT SAT,GPS Position determination method --- FURUNO DR BETWEEN SAT FIXES Bathymetry instrumentation --- GENERL INSTRMNTS SEABEAM CENTER BEAM Additional forms of bathymetric data --- SWATH ALSO COLLECTED BY URI General rate of bathymetry in file --- 1.0 minutes General collection rate of bathymetry --- 1 each 6 sec Assumed sound velocity --- 1500.0 m/sec Bathymetric datum code --- No correction applied (sea level) Bathmetry interpolation scheme --- LOGGED ALL CNTR BEAM,CLOSEST TO 0 SECS. INTERP Magnetics instrumentation --- VARIAN V75 MAGNETOMETER Additional forms of magnetics data --- (unspecified) General rate of magnetics in file --- 1.0 minutes General collection rate of magnetics --- 20 seconds Magnetic sensor tow distance --- (unspecified) Magnetic sensor depth --- (unspecified) Two sensor horizontal separation --- (unspecified) Residual magnetics reference field --- IGRF-85 Method of applying residual field --- BILINEAR INTERP IN 1 DEG SQUARE Gravity instrumentation --- BELL AEROSPACE BGM-3 GRAVITY METER Additional forms of gravity data --- (unspecified) General rate of gravity in file --- 1.0 minutes General collection rate of gravity --- (unspecified) Theoretical gravity formula --- INTERNATIONAL 80 Reference system --- Potsdam system Corrections applied --- +.0328 MGAL/DAY, DC +.57 MGAL Starting land tie --- 978030.0 NOAA SHIP BASE NO.2,MIAMI,1/7/87 Ending land tie --- 981326.2 PORT ADMIN BLDG,P. ARENAS,2/13/S Seismic instrumentation --- DIGICON DSS-240 Formats of seismic data --- (unspecified) Notes --- THEORETICAL GRAVITY FORMULA: Yo = 978.0327 * ( 1 + a - b ) where b = .0000058 * sin( 2 * theta ) * sin( 2 * theta ) . NGDC has multibeam bathymetric data for this cruise, however the tracklines found here in GEODAS may not exactly correspond to the multibeam data. Got Help? For C-1-88-SP, we would appreciate any information on -- analog materials, contract, days at sea, dive count, funding, information specialist, information to be derived, kms of navigation, national plan, organization, owner, ports, project, project number, publications, scanned materials, seismic description, station count, station description, submersible, summary, tabulated info. Skip footer navigational links InfoBank   Menlo Park & Santa Cruz Centers   St. Petersburg Center   Woods Hole Center   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer

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U.S. Department of the Interior | U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/c/c188sp/html/c-1-88-sp.meta.html Page Contact: InfoBank staff Page Last Modified: Wed Jan 7 05:41:34 PST 2009  (wcs)