More aftershocks -- some in the 5.0- to 6.0-magnitude range -- are expected to shake Southern California in the wake of Sunday's magnitude-7.2 earthquake near Mexicali. The quake was felt throughout Southern California.
"It sounds like it's felt by at least 20 million people at this point," USGS seismologist Dr. Lucy Jones said. "Most of Southern California felt this earthquake."
Initial reports said the quake was magnitude-6.9, but officials with the USGS later changed the figure to 7.2. The USGS timeline shows a swarm of aftershocks and other earthquakes....