Last updated on April 19, 2014 at 5:20 EDT
Rocks Recovered from San Andreas Fault
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Rocks Recovered from San Andreas Fault

July 27, 2010
For the first time, geologists have extracted intact rock samples--or "cores"--from two miles beneath the surface of the San Andreas Fault, which runs 800 miles along the length of California. This is the first time that cores from deep inside an actively moving tectonic boundary have been available to study, and scientists hope they will help answer long-standing questions about the fault's composition and properties.