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Shaded relief map of California showing the location of EarthScope's San Andreas Fault Observatory at Depth (SAFOD) in Parkfield, CA. Portions of the San Andreas Fault that ruptured in major historical earthquakes are shown in red, with the creeping and micro seismically active segment of the fault in blue. The SAFOD is a deep 2-mile 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.
Courtesy of EarthScope.
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