Magnitude 4.2 earthquake shocks Julian, California

Magnitude 4.2 earthquake shocks Julian, California

Dec 6, 2017

According to the San Diego Union Tribune, a magnitude 4.2 earthquake occurred eight miles northeast of Julian at 4:33 p.m. on Wednesday December 6, shaking a wide area of the county, the U.S. Geological Survey said.

The quake started nearly 10 miles beneath the earth’s surface, just east of the Earthquake Valley fault, one of the most active systems in Southern California.

The main shock was followed five minutes later by a 3.1 aftershock in the same spot.

The quake was felt in Julian, Warner Springs, Del Mar, Poway, Alpine, La Jolla, Ramona, Escondido, and El Cajon, the USGS said.

“We felt (the) floor shaking on the 7th floor of Jacobs Hall (at UC San Diego),” said Ioana Patringenaru, a campus spokesman. “It was fairly mild and followed by another mild wavy motion.”

Tom Rockwell, a seismologist at San Diego State University, said “This was probably on the Earthquake Valley fault, which is a parallel strand to the Elsinore system. It has about the same slip rate as the Elsinore. It can produce large earthquakes, and might have produced the historical 1890 earthquake, which was 6.3 or close to that.”

Source: San Diego Union Tribune

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