US Geological Survey
The yellow dot denotes the epicenter of Friday’s earthquake. 
A magnitude 3.3 earthquake occurred 11 miles west-southwest of La Jolla at 1:09 p.m. Friday, causing brief shaking along the coast from Oceanside to San Diego and in some inland cities, including Escondido and Poway, the U.S. Geological Survey said.
“This happened on the Coronado Banks fault system, which is more than 60 miles long and capable of producing much larger quakes — ones above 6.0,” said Tom Rockwell, a geology professor at San Diego State University.
“This looks to be a garden-variety quake — a precursor to nothing bigger.”
The Coronado Banks fault is part of a larger network of offshore seismic zones, some of which are capable of generating shaking big enough to cause damage onshore.
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