Cupcake Quakes Rattle Chino Hills

Thursday, Jan 7, 2010  |  Updated 2:48 PM PDT
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Cupcake Quakes Rattle Chino Hills

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Seismograph (image does not depict recent Chino Hills activity... if it did, you would have felt something).

The Chino Hills are rattling again Saturday.

A swarm of micro-earthquakes has struck the area where the Los Angeles, Orange and San Bernardino county lines come together. Four tiny earthquakes have hit the area since midday Friday, according to seismographs operated by local universities and the U.S. Geological Survey.

The biggest quake, magnitude 1.9, struck at 3:36 a.m. Saturday with an epicenter in the hills south of the interchange of the Pomona (60) and the Chino Valley (71) freeways.

A quake hit at 6:33 a.m. Saturda, with a 1.8 magnitude. Such quakes are far too small to create damage, and likely would not be felt by most people, seismologists have said.

But the mini-swarm comes a week after a larger swarm of earthquakes hit 100 miles away, at the Salton Sea, which experts said may be a foreshock to major activity on the San Andreas Fault.

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