A magnitude 5.1 earthquake struck the region of Big Bear Lake on Saturday afternoon at 1:05 pm (PST). The event was located north of Big Bear Lake and thus north of the aftershock zone of the 1992 Big Bear earthquake (M6.2). The focal mechanism of the event shows strike-slip motion on a close to vertical fault.

The seismic history of the San Bernardino Mountains is characterized by M4.5-5.5 earthquakes every few years. The most recent was the M4.8 Whiskey Springs earthquake that occurred in October 1998.

As of 2:40 p.m. on Saturday, the SCSN had recorded 15-20 aftershocks to this event. The largest has been a M3.1. The average aftershock sequence to a M5.1 mainshock would include about 8 M>3 aftershocks in the next 7 days.

Felt reports for this earthquake range, so far, from Woodland Hills down to San Diego, of course being felt strongest in the epicentral area. According to the Governer's Office of Emergency Services, at this time there are no reports of damage in San Bernardino and Riverside counties.