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The Global Positioning System (GPS) is a constellation of 24 satellites
which is used for navigation and precise geodetic position measurements. Daily
position estimates are determined from satellite signals which are recorded by
GPS receivers on the ground. Data from the
IGS,
SCIGN,
BARD,
CORS,
BARGEN, and
PANGA
networks have been analyzed at the Jet Propulsion Laboratory, California
Institute of Technology under contract with the National Aeronautics and Space Administration. Horizontal velocities, mostly due to motion of the Earth's
tectonic plates and deformation in plate boundary zones, are represented on the
maps by arrows extending from each site. Click on the list of names to see
detailed time series for a particular site. Additional information may be
obtained from mbh@cobra.jpl.nasa.gov.
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