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Then-US Secretary of the Interior Dirk Kempthorne (C) and United States Geological Service (USGS) Seismologist Lucy Jones (L) participate with students of Stevenson Elementary School as they drop, cover and hold on during the region-wide simulation of an expected catastrophic 7.8 magnitude earthquake on the San Andreas Fault during the Great Southern California ShakeOut earthquake drill, the largest earthquake preparedness event in US history, on Nov. 13, 2008 in Burbank.