Update: Quake magnitude revised to 3.4


An earthquake with a magnitude of 3.4 rattled the Peninsula this afternoon on the 105th anniversary of the 1906 San Francisco quake. Initially, the U.S. Geological Survey reported a preliminary magnitude of 3.8.

The quake, which occurred at 2:57 p.m., was centered about two miles southeast of Pacifica, according to the U.S. Geological Survey.

It was followed at 3 p.m. by a second, smaller earthquake with a magnitude of 1.4. That quake was centered about 2 miles southwest of San Bruno.

The first quake was felt in parts of the Bay Area including San Francisco and Oakland.

In the Menlo Park area, people reported feeling a short rattle.

An office worker in San Mateo said she felt a jolt. "I couldn't tell if it was an airplane crash or an earthquake. It was a booming jolt.

Caltrain service was not affected, and operations were not altered at San Francisco International Airport.

For more information from USGS, click here.

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