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One of the GPS antenna placed on top of a hill in Parkfield, CA, that detects ground movements as small as 2 to 3 mm. The antenna feeds a vast network of seismic and GPS earthquake measurement devices. The town of Parkfield, located on the San Andreas Fault in central California, is one of the world’s most seismically active areas. It has been the site of an intensive earthquake study since the late 1970's and a team of scientists recently reached the fault’s active zone through a 2-mile deep borehole. This project, named SAFOD, is a major step in learning more about earthquakes and maybe predicting them.
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