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Update: 3.4-magnitude quake hits Peninsula

Several aftershocks reported throughout evening on anniversary of San Francisco's Great Quake of 1906

An earthquake with a magnitude of 3.4 and several smaller aftershocks rattled parts of the Bay Area Monday afternoon and evening.

Initially, the U.S. Geological Survey reported the quake had a preliminary magnitude of 3.8, which it has since revised numerous times. As of 9:50 p.m. Monday, the estimate of the strongest seismic event's magnitude was 3.4.

The largest quake, which occurred at 2:57 p.m., was centered about 2 miles southwest of San Bruno and two miles southeast of Pacifica, according to the USGS. It was followed at 3 p.m. by a second, smaller earthquake with a magnitude of 1.5. That quake was centered about two miles southwest of San Bruno and three miles southeast of Pacifica.

Caltrain service was not affected, and operations were not altered at San Francisco International Airport. Several aftershocks occurred in the same area throughout the evening, including a 2.4-magnitude tremor at 4:55 p.m. and a 2.2-magnitude quake at 8:35 p.m., both of which were centered two miles southeast of Pacifica.

The quakes occurred on the 105th anniversary of San Francisco's Great Quake of 1906.

For more information about the earthquake including a map of the region, visit earthquake.usgs.gov.

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Comments

Like this comment
Posted by nothing in midtown
a resident of Midtown
on Apr 18, 2011 at 3:29 pm

Didn't feel anything in midtown Palo Alto.


Like this comment
Posted by mmmmMom
a resident of Downtown North
on Apr 18, 2011 at 3:33 pm

Having coffee with a friend in Midtown - we definitely felt it!


Like this comment
Posted by jpham
a resident of Menlo Park
on Apr 18, 2011 at 3:36 pm

Felt it a little bit here in Menlo Park/EPA


Like this comment
Posted by Midtowner
a resident of Midtown
on Apr 18, 2011 at 3:46 pm

Not felt at home in Midtown.


Like this comment
Posted by CD
a resident of Community Center
on Apr 18, 2011 at 4:08 pm

Felt it at home in Community Center . . . increasing intensity of bumpiness (cresting at just a bit higher than the level of a passing heavy truck) for about 5-6 seconds


Like this comment
Posted by jenny
a resident of Stanford
on Apr 18, 2011 at 4:46 pm

Felt it here at Stanford West -- a huge jolt as if something enormous (like, our house) had been dropped. No vibrations.


Like this comment
Posted by Palo Verde Resident
a resident of Palo Verde
on Apr 18, 2011 at 4:47 pm

Thought a heavy truck was passing outside my house from the noise and the vibrations, didn't think earthquake at the time but realise it was.


Like this comment
Posted by SLACer
a resident of Menlo Park
on Apr 18, 2011 at 8:06 pm

Felt it shake the NW corner of B34 at SLAC.


Like this comment
Posted by pack
a resident of Midtown
on Apr 19, 2011 at 6:20 am

We felt in midtown, thought it was a truck accident on Middlefield road for a second when we heard the loud noise and then we realized it was a quake when the windows rattled.


Like this comment
Posted by Steven
a resident of another community
on Apr 19, 2011 at 6:22 am

Felt a couple sharp jolts in San Mateo. Our 5-story office building creaked alot.


Like this comment
Posted by Anon.
a resident of Crescent Park
on Apr 19, 2011 at 1:10 pm

There was a shake near Eleanor Park


Like this comment
Posted by Lisa
a resident of Old Palo Alto
on Apr 19, 2011 at 2:04 pm

We felt it as far south as Santa Clara - a sharp bump, i definitely knew it was an earthquake.


Like this comment
Posted by quake
a resident of Adobe-Meadow
on Apr 20, 2011 at 9:27 am

pretty good ride up the peninsula


Sorry, but further commenting on this topic has been closed.

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