The earthquake had a preliminary magnitude of 5.2 and was near the mountain town of Julian, east of San Diego, according to the U.S. Geological Survey. Multiple aftershocks in the 2 and 3 magnitude range have been reported.

A series of aftershocks hit eastern San Diego County following a 5.2 magnitude earthquake that rattled much of San Diego and Southern California, with at least 9 aftershocks registered in the hour