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A technician monitors the angle taken underground by the drill pipe of the San Andreas Fault Observatory at Depth (SAFOD) drilling rig in Parkfield, CA. The SAFOD is a deep 2-mile (3.2 km) borehole observatory that has reached, for the first time, the fault’s active zone early August 2005. The SAFOD will directly measure the physical conditions under which plate boundary earthquakes occur. It is a major step in learning more about earthquakes and maybe predicting them. The town of Parkfield, located on the San Andreas Fault in central California, is one of the world’s most seismically active areas and has been the site of an intensive earthquake study since the late 1970's
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