5.1 earthquake rocks Mexico

CALEXICO, Calif. " A magnitude-5.1 earthquake struck the northern Baja California region of Mexico near the U.S. border today, just days after the region was hit with a magnitude-5.4 temblor, authorities said.

The quake was centered about 20 miles southeast of the border town of Mexicali at a depth of 4.3 miles, according to the U.S. Geological Survey. The epicenter was 23 miles south-southeast of the U.S. city of Calexico.

The latest temblor comes three days after the Mexicali area was rocked by a magnitude-5.4 quake that shut down factories and left 400,000 people without power.

There were no reports of immediate damage or injuries on the U.S. side, according to the Imperial County Sheriff's Department and Calexico police.

The quake was felt in parts of San Diego, Imperial and Orange counties and as far away as Yuma, Ariz., according to the USGS.

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U.S. Geological Survey: http://www.usgs.gov