Source: East County Magazine
August 26, 2011 (San Diego’s East County) – More than 200 earthquakes centered near Brawley in Imperial County have rocked our region in the past 24, many felt by residents across San Diego. The strongest measured 5.5 and 5.3 on the Richter scale; the most recent, a 5.1, rattled the area at 10 p.m.
View a map; hit “animation” to see the progression:
http://earthquake.usgs.gov/earthquakes/recenteqsanim/canv/.
According to the San Diego County Emergency website, the California Emergency Management Agency (Cal EMA) has conferred with scientists representing the California Geological Survey, US Geological Survey, Cal Tech and the Southern California Earthquake Center. Cal EMA is advising Imperial County that an increased likelihood exists for continued seismic activity for at least the next 24 hours, potentially including earthquakes larger than today's magnitude 5.5 earthquake.
Brawley has previously had swarms of quakes in the 1970s and 1930s. The Brawley fault cluster is tied to the San Andreas fault and is among the most seismically active places in California.