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4.3 earthquake in Baja California lightly shakes San Diego County

A magnitude 4.3 earthquake occurred near Ensenada before dawn on Monday, generating shaking that was briefly but widely felt across San Diego County, according to the U.S. Geological Survey.

The agency said the temblor happened shortly before sunrise at El Sauzal, a tiny community northwest of Ensenada in Mexico. It appears to have occurred on the Aqua Blanca fault, an 80-mile-long system that can produce quakes in the 7.0 range.

“This is probably just a garden variety 4.3 quake,” said Tom Rockwell, a seismologist at San Diego State University. “But that fault is known to produce big ones every 700 to 800 years.” The last big shaker happened more than 300 years ago.

The USGS said Monday’s quake was felt in such places as Chula Vista, San Diego, Encinitas, Oceanside and San Marcos.

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