BERKELEY (CBS 5 / KCBS) — A pair of earthquakes, with magnitudes of 4.0 and 3.8 respectively, rattled the San Francisco Bay Area on Thursday afternoon and evening, but local police agencies said there were no reports of serious damage or injuries.

Both quakes were centered near Berkeley with depths of around six miles. The 4.0 temblor occured at 2:31 p.m., followed by a 3.8 temblor nearly six hours later at 8:16 p.m., according to the U.S. Geological Survey.

USGS seismologist Jack Boatwright said the first one was a “sharp little earthquake” that had a “very nice impulsive character.” Other USGS scientists described the second quake as an aftershock.

>> Related Content: Special Earthquakes Section

Based on USGS maps, the quakes’ epicenters appeared to be beneath the University of California Berkeley’s Clark Kerr campus.

Both temblors created large jolts throughout the East Bay that were also felt across the bay in San Francisco — most notably shaking the city’s Civic Center area. The quakes were also felt in other parts of the region including Sausalito to the north and as far south as Santa Cruz.

“(There was) a medium jolt, then a significant low frequency shake for more than 5 seconds — by far the biggest in the 18 years I have lived here,” Foster City resident Jeff Arcuri said, in describing the nighttime quake to CBS 5.

“It was a nice jolt,” agreed Diane Coppini, who said the evening temblor was strong enough to knock photographs off the wall and glasses onto the floor at her Emeryville home.

Keith Knudsen, deputy director of the USGS Earthquake Science Center in Menlo Park, said Thursday’s temblors were standard Hayward Fault Line quakes of the typical “strike-slip” variety, in which two sides of the fault slide horizontally.

“We live on Hayward Fault and felt a rolling motion,” said resident Edward Berini in one of many e-mails sent to CBS 5 in the minutes after the first quake occured.

“My apartment shook for a couple of seconds,” e-mailed Melanie Johnson from downtown San Francisco, while Craig Cannon in Martinez wrote, “Felt it real good upstairs at home. It felt like one of those old fashioned massage beds.”

KCBS’ Chris Filippi Reports:

Staff members at the Rockridge Branch Library in Oakland said that a rumbling sound could be heard right before the first quake hit and sent a few pieces of mounted artwork askew.

“It was very dramatic here — the building shakes every time a truck goes by — so everyone in the building noticed it,” said Erica Siskind, a children’s librarian.

At Saul’s Restaurant and Deli in Berkeley, restaurant manager Taci Traverso said she also “heard it coming.”

“It’s hard to describe, but I was sitting on the sidewalk and I felt a rumbling sound before I felt the vibration,” she said.

Tami Humphrey, director of a pre-school just north of Berkeley, said she was outside with her students when the afternoon quake struck: “We felt it pretty good. It felt like a drop and then a shake.”

All Bay Area Rapid Transit trains were halted for about 15 minutes after each quake, BART officials said, as train operators conducted track inspections. No damage was found.

The USGS’ Knudsen said there was roughly a 5 percent chance that Thursday’s quake activity could be a foreshock to a larger seismic event, which San Francisco Mayor Ed Lee called “another reminder that we have to be prepared.”

The jolts were felt almost 22 years to the day after the Loma Prieta earthquake struck the Bay Area during the 1989 World Series. The magnitude 6.9 quake killed 63 people, injured almost 3,800 and caused up to $10 billion damage.

>> Photo Gallery: 1989 Loma Prieta Earthquake Damage

>> Photo Gallery: 1906 Great San Francisco Earthquake Damage

Thursday’s quakes also occurred on the same day that more than 8.5 million people participated in the state’s annual earthquake drill known as the Great California Shake Out.

(Copyright 2011 CBS San Francisco. All rights reserved.)

Comments (21)
  1. JoMama says:

    Ain’t no big thang! An earthquake this small isn’t even newsworthy.

  2. SFCARE says:

    waht ever but just the same?! We live in God’s etch a sketch! (so be prepared!)

  3. s.f. peaches says:

    I hope these small quakes persuade people to take inventory of their emergency supplies. Information such as contact phone numbers and sites where family members can meet should also be reviewed. Imagine a worst case scenario and consider your household’s individual needs. For some families it’s baby food, and for others it’s medication. It might be days before you receive outside help.

  4. Jc Meoff says:

    Too Funny! The KPIX reporter? asked the USGS employee if this was a foreshock for another earthquake? Wow! Didn’t know the technology had come so far as to determine if a quake is a foreshock or aftershock, let alone if this quake was predicted. Glad to know that high school graduates or less can still get a job at KPIX. Idiots Unite!

  5. Chet Ferdun says:

    Good standby KCBS. Fast with the news. Thought newspaper might have posted quake by now, no.
    My take on the rumble is though we didn’t have damage, I always worry about other areas that might have been closer to the center

  6. Bill says:

    Imagine watching a San francisco earthquake from a penthouse in the Marina District no. 122418

  7. Barbara Lockhart says:

    I felt the earthquake here in Sausalito. It was a difinite jolt and rumble. No damage.


    1. JoMama says:

      Big deal, I felt it too. Ain’t no big thang!

  8. proud_bay_man says:

    The second one felt MUCH stronger than the first. It rocked our building here in 941414

  9. Pam C says:

    Felt the eathquake in Terra Linda San Rafael. Just a little rattle. No damage

  10. mmh says:

    I live in San Jose downtown near the HP Pavilion and I felt prolonged (several seconds of) shaking inside our 3rd floor apt – but I am wondering if anyone else felt it here? None of the news channels are reporting that tremors were felt here in SJ…

  11. Christine says:

    No damage at my place in Benicia but lots of shaking. It seemed to last forever, even though it was just a few seconds.

  12. Bob says:

    My Cat noticed the 2nd jolt before I did…after the jolt we both went back to watching television…

  13. Craig says:

    The second earthquake felt larger in Pac Heights San Francisco.

  14. stann says:

    Earthquakes were predicted and more will come anywhere anytime .A sign of the beginiing of the end .Because we all cant get along on thiis planet . And if you dont believe thats ok. The end will still come beware

    1. Nadnerbus says:

      You must be from Berkley.

      1. Ed says:

        Stann are you going bye bye today with the rev. ….

    2. Dawg says:

      And your point is???

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