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Series Of Mini-Quakes Rattle Chino Hills

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Mar 29, 2009 8:58 am US/Pacific

Series Of Mini-Quakes Rattle Chino Hills

CHINO HILLS (CBS) ―

Click to enlarge 1 of 1: 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. (File)
AP

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The small swarm of micro-earthquakes shaking up the Chino Hills continued Sunday, when a magnitude 1.5 tremor hit at 6:33 a.m.

At least seven similarly-sized tremors have shaken the area near Diamond Bar, close to the Pomona (60) and Orange (57) freeways, this weekend, according to automated seismographs operated by the U.S. Geological Survey and local universities.

The largest quake was a magnitude 1.9 movement, which hit at 3:36 Saturday morning.

Epicenters have generally been calculated to be 7 miles beneath the surface of the land, about 29 miles east of the Los Angeles Civic Center.

The quakes are far too small to cause damage, and may be too small to even be felt by people in the area.

The microquakes have hit at the same time that a much-stronger swarm of earthquakes alarmed residents of the Coachella Valley, 110 miles to the east. A magnitude 4.8 shaker last Tuesday kicked off a series of more than 300 aftershocks under the Salton Sea.

That area, along the southern-most reach of the San Andreas Fault, is long overdue for a major stress-releasing earthquake, according to seismologists. Such a quake could cause significant damage in the Los Angeles area, they have said.

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