A magnitude 3.8 earthquake occurred at 9:08 a.m. Saturday about 8 miles (13 km) north-northeast of Borrego Springs, producing brief, light shaking in many areas of San Diego County, according to the U.S. Geological Survey.
Shaking was reported in Borrego Springs, Julian, San Marcos, Escondido, Ramona, Poway, Boulevard, Campo, Fallbrook, Vista, Encinitas, San Diego and Chula Vista, the agency said.
The earthquake, which began 7 miles (12 km) deep underground, occurred on the San Jacinto Fault Zone, one of the most active seismic zones in Southern California. The strike-slip fault extends across parts of San Bernardino, Riverside, San Diego and Imperial counties.
The fault generally produces earthquakes in the 3.0 to 4.5 range. But it generated a 7.1 earthquake in the San Jacinto-Hemet area in 1899.
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