The most exciting news of late is the recovery of rock samples from 2 miles beneath the surface of the San Andreas Fault. The San Andreas Fault system is one of the most active that runs for 800 miles along the length of California. It was the cause of the Great San Francisco earthquake and the Loma Prieta temblor.
Geologists from Stanford and the USGS now know the rock type that comprises the fault and can study how the system works. The work is a result of the San Andreas Fault Observatory at Depth (SAFOD) project, which is establishing the world’s first underground earthquake observatory.
See: “Geologists Recover Rocks Yielding Unprecedented Insights into San Andreas Fault” from the USGS
Image: Portion of the San Andreas fault. Image generated using data from the Shuttle Radar Topography Mission (SRTM)Courtesy NASA/JPL/NIMA