There have been hundreds of aftershocks from the magnitude 5.2 earthquake that rattled Southern California on Friday. Aftershocks are common after significant quakes, and Friday’s temblor – which was felt from San Diego to Los Angeles and beyond – produced a few larger than 3.0. Most were much smaller.

The quake occurred in a sparsely populated area near Borrego Springs in San Diego County but the 1:04 a.m. quake was felt across a wide area. “It’s the biggest one for a while,” said Egill Hauksson, a research professor of geophysics at Caltech. Friday’s temblor occurred on the San Jacinto fault, the most active in the region, Hauksson said. As of Saturday, the U.S. Geological Service listed more than 200 aftershocks in the Borrego Springs area, and there were others nearby. READ MORE