Hundreds of Earthquakes Shake Southern California in Rare Seismic Swarm

Southern California residents were rattled Sunday when hundreds of earthquakes struck in what geologists are calling a rare "seismic swarm." It was the first time

since the 1970s that such an event had occurred in the area. The largest of the tremors was magnitude 5.3 and was felt as far east as Arizona. Some hospital patients had to be evacuated, but no one was injured.

William La Jeunesse filed this report on Happening Now.