Above: Artist's conception of a Global Positioning System (GPS) satellite in orbit. (Illustration courtesy of NASA.) Below: A GPS ground receiver -- here set up on the flank of Augustine Volcano (Cook Inlet, Alaska) -- recording the signals sent by four or more of the orbiting GPS satellites. (Photograph by Jerry Svarc, USGS.)
"Understanding
plate motions"
U.S. Department of the Interior |
U.S. Geological Survey
URL: https://pubsdata.usgs.gov/pubs/gip/dynamic/GPS.html
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