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Earthquake swarm continues to shake up California border region

June 16, 2010 |  8:12 am

Earthquake map centered at 33°N,116°W

An earthquake swarm continued to produce hundreds of temblors along the California-Mexico border on Wednesday morning.

The swarm began with a 5.7 earthquake Monday night that was felt across Southern California. It was followed by more than 1,000 aftershocks, most of them tiny but some measured more than 4.0 magnitude.

Overnight, the Imperial County region was hit by seven quakes greater than magnitude 3.0.

All the quakes are believed to be aftershocks from the 7.2 Mexicali quake the struck the border area on Easter Sunday.

"With something as big as a 7.2, the aftershocks are going to continue for years or decades," said Susan Hough, a U.S. Geological Survey seismologist.

Many of the recent aftershocks have occurred near the small town of Ocotillo, just off Interstate 8 in Imperial County.

-- Shelby Grad

Map credit: U.S. Geological Survey

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