Magnitude-4.5 quake, others shake San Diego area

SANTA ANA, Calif.-A moderate earthquake near the U.S.-Mexico border rattled parts of Imperial and San Diego counties as a swarm of seismic activity continues nearly a week after a magnitude-7.2 quake slammed the area.
The U.S. Geological Survey says the magnitude-4.5 quake hit at 2:12 a.m. Saturday, about 16 miles west southwest of Calexico.No damage or injuries have been reported.
More than a dozen quakes above magnitude-3.0 hit later in the day, including one at magnitude-3.7 shortly before noon....
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