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Series of quakes shakes northern Baja

Five small earthquakes struck Saturday and Sunday in the same area of northern Baja California and were close enough to be felt in

San Diego County.

The largest hit Saturday just after 4 p.m. and was estimated at

magnitude 4.3. Its epicenter was about 30 miles southeast of Calexico and 100 miles east of Tijuana, according to the U.S. Geological Survey.

The first weekend quake was magnitude 3.2 at 1:40 p.m. Saturday, and itwas followed by a magnitude 3.2 at 12:52 a.m. and a 3.4 shaker at 2:36 a.m. Sunday, according to the USGS.

There was no known damage as a result of the quakes, the latest of

hundreds of small quakes that have been rattling the Imperial Valley and East County since 2007.

The swarm is centered near Guadalupe Victoria, a small farming town 19

miles southeast of Mexicali. A small volcano there erupted about 10,000 years ago, and geologists say the quake swarm emanates from shallow magma fields associated with tectonic forces that are steadily separating Baja California from the rest of North America.