Earthquake now: Several small earthquakes rattled residents across San Bernardino and Riverside counties in Southern California on Thursday morning. The strongest, a 4.3-magnitude quake, struck near Muscoy, north of San Bernardino. Shaking was widely felt, from Bakersfield to San Diego. Seismologist Dr. Lucy Jones identified the quakes as "foreshocks" in the Fontana trend area, known for earthquake clusters.