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A pair of small quakes about a second apart occurred late Sunday on various fault systems south of the US-Mexico border, causing mild shaking in areas of San Diego County, according to the US Geological Survey.
“It’s absolutely crazy,” said Tom Rockwell, a seismologist at San Diego State University. “It is very random that earthquakes occur when separate faults occur at about the same time.”
The first quake was a 3.4-magnitude earthquake at 5:13 p.m. about 5 miles west-southwest of Tecate, Mexico and 15 miles west-southwest of Campo. It was immediately followed by a magnitude 6 earthquake about 23 miles west-southwest of Progreso, Mexico and 31 miles east-southeast of Campo.
There was no immediate indication that the first earthquake caused the second.
Small earthquakes occur regularly in and around the US-Mexico border, Rockwell said, but rarely lead to large events.
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