People in southern California dropped simultaneously to ground Thursday morning, huddled under tables and held on for about a minute in what is being billed as the largest earthquake drill in history.
More than 5 million people registered to participate in the drill. It was part of the weeklong Great Southern California ShakeOut, a series of events organized by scientists and emergency officials to prepare people for a major earthquake, something scientists and researchers think is overdue in the area.
Most participants -- whether in classrooms, offices or homes -- were expected to take cover under tables or desks and hold on as though a devastating earthquake were rattling buildings and structures. 
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All About California • Earthquakes • U.S. Geological Survey
