A pair of small earthquakes occurred one second apart late Sunday on different fault systems south of the U.S.-Mexico border, producing light shaking in areas of San Diego County, according to the U.S. Geological Survey. "That's absolutely crazy," said Tom Rockwell, a seismologist at San Diego State University. "It's very random that quakes on separate faults happen at about the same time." The first quake was a 3.4 temblor that hit at 5:13 p.m. about 5 miles west-southwest of Tecate, Mexico, and 15 miles west-southwest of Campo.
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