Signs on San Diego news link
...Over the past few years, small earthquakes have hit near Borrego Springs, Julian, Coronado, off La Jolla and near Mexicali in northern Baja. Yesterday's quake was larger, but still fairly routine, experts said.
“This will happen anywhere in Southern California every so often,” said Jean-Bernard Minster, a geophysics professor at the Scripps Institution of Oceanography.
Though the area isn't as seismically active as Los Angeles and San Francisco, fault lines run throughout the county. One, the Rose Canyon fault, goes through the city of San Diego. Not only that, but other fault lines near the region – especially the San Jacinto and San Andreas faults to the east – could cause considerable damage here if they unleash quakes.
Minster said geologists are especially concerned about the southern portion of the San Andreas fault, which extends roughly from the Salton Sea to Wrightwood. That portion usually breaks every 220 years or so but hasn't done so since 1680, he said...
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