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Shaker occurs where 'swarm' of smaller quakes have been happening since early March.
The Chino Hills, which produced a 5.4 earthquake last July, generated a 3.8 quake at 4:56 p.m. today, releasing seismic energy felt as far south as Aliso Vejio and as far north as Altadena, the U.S. Geological Survey says.
Click here for the real-time Southern California earthquake monitor.
Today's quake occurred just north of Yorba Linda, where a series of small quakes has been occurring since early March, seismologists say. (Click here for map of all quakes in O.C. area this month.)