Ms. Susan McLean, Director

Tel: +1 303 497 6478

WDC for Solid Earth Geophysics, Boulder

Fax: +1 303 497 6513

Maintained by: U.S. Department of Commerce, National Oceanic and Atmospheric Administration (NOAA). The WDC for Solid Earth Geophysics, Boulder is operated by, and collocated with, the National Geophysical Data Center (NGDC).

Summary of Data Held: The WDC for Solid Earth Geophysics (SEG), Boulder, manages all types of data from the solid Earth, including topography, geomagnetism, gravity, natural hazards, and other geophysical phenomena. Data are contributed by sources from around the world. Special emphasis is given to data supporting IUGG and UNEP programs.

• Geological Hazards: Information is available for historical tsunamis, significant earthquakes, volcanic eruptions, lava forms, and land slides. Digital data include historical tsunamis, earthquake epiCenters, and strong motion data. Other information is available as a series of slide sets and publications. The WDC for SEG, Boulder emphasises the economic impact and damage from significant past events. For information on current earthquake events, visit the WDCs for Seismology.
• Geomagnetism: Data include surface, ocean, airborne, and satellite measurements supporting models relating to analyses of the main field and its secular change - including the newly released World Magnetic Model and International Geomagnetic Reference Field model for 2005-2010. Magnetic observatory monthly and annual mean data, repeat station observations, and the complete Project Magnet vector survey data are among the databases available for model development.
• Topography: A number of regional and global topographic models are available, including the most recent release of a global 5-minute digital elevation model (DEM). The WDC-USA also participates in the GLOBE Project, initiated by the Committee on Earth Observing Satellites, to develop a 1-km gridded, quality-controlled DEM.
• Gravity: The latest gravity compilation contains over 100 data sets, including U.S. station data, absolute measurements, regional surveys from the U.S. and seven international surveys, 34 gridded regional data sets and nine gridded global data sets, and correlative data such as global geoids, geoids from the U.S., Canada, and a 5-minute topography grid.
• Paleomagnetism: The latest IAGA supported paleomagnetic data compilations are available including the Global Paleomagnetic Data Base, Paleointensity Data Base, Polarity Transitions Data Base, and Secular Variation Data Base.

User Services: The WDC for SEG is located in the David Skaggs Building at 325 Broadway, Boulder, Colorado. Visitors are welcome during normal working hours; advance notice is recommended. A visiting scientist program exists. Data processing, copying and analysis facilities are available. Data are available on most media including DVD, CD-ROM, via Internet, and other media on request. On-line access via Worldwide Web (URL address above), Gopher (gopher.ngdc.noaa.gov) and anonymous FTP (ftp.ngdc.noaa.gov). Login for FTP access is userid: anonymous, and password: your full e-mail address.

Publications: Solid Earth Reports, including annual reports on the global magnetic observatory network. Many reports are also available in digital form through the Worldwide Web. Some reports are published jointly with WDC for SEG, Moscow.

Special Projects: The WDC for SEG, Boulder is participating in the IUGG GeoRisk Project and in various international satellite programs to make accurate measurements of the magnetic field surrounding the Earth.