National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

Data Center Description
The National Geophysical Data Center (NGDC) combines, in a single data center, the fields of seismology, geomagnetism, marine geology and geophysics, solar phenomena, the ionosphere, and snow and ice. NGDC collects, organizes, archives, publishes, and disseminates solid earth, solar-terrestrial physics and snow and ice data from worldwide sources. NGDC also operates the World Data Center A-Solid Earth Geophysics, the World Data Center A-Solar-Terrestrial Physics, and the World Data Center A for Marine Geology and Geophysics, and the World Data Center A-Glaciology (Snow and Ice). NGDC also contracts through the University of Colorado to handle data services for the National Snow and Ice Data Center (NSIDC).

Accelerograms, digitized strong-motion data, and historical file of earthquake epicenter data and tsunami occurrences are also part of the Center's holdings. Geomagnetic data consist primarily of worldwide geomagnetic, and aeromagnetic survey measurements, observatory magnetograms, digital values of various sample ratings, and indexes of magnetic activity. Holdings include about one million magnetograms which accumulate at a rate of 50,000 per year, most held on 35-millimeter microfilm, and hundreds of magnetic tapes containing digital data derived from magnetograms and survey measurements. The file maintained by the Center's Solar-Terrestrial Data Service Division now contains more than 12 million feet of ionogram film, 800,000 feet of all-sky camera film, 3 million sheets of graphical and numerical data, and additional information on magnetic tape received from NOAA and NOAA-supported stations as well as several hundred cooperating institutions. The National Snow and Ice Data Center holds data on all forms of snow and ice: one million transparencies and negatives of DMSP imagery; 400 computer-compatible magnetic tapes containing sea ice, snow cover, lake ice and ice core data; 200 microfiche and films reels of lake ice, climatological and snow cover data; 10,000 historical glacier photos, a 39-megabyte online database indexing the 20,000-document Information Center Collection, and an 19-megabyte Glacier Photo Index online database. The Marine Geology and Geophysics holdings include 10.2 million track miles of underway geophysical data, 35.5 million National Ocean Survey hydrographic records, and information on 132,000 ocean bottom geologic core samples and geochemical analyses of over 5100 marine mineral samples. System Contact:

Ordering / Price Policy: Services are available without restrictions. Working visits by US and foreign scientists to the Center are encouraged; facilities will be provided upon advance notice. NGDC staff is available for consultation and discussion in all relevant disciplines. Copies of primary data and data products are available to users on an exchange basis or at cost of the service. Contributors of data to NGSDC and its associated World Data Centers are entitled to an equivalent amount of data without charge.

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