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3.1-Magnitude Earthquake Hits Near Berkeley an Hour Before Great California ShakeOut

The 3.1 magnitude quake struck near the UC Berkeley campus on the Hayward Fault, highlighting the area's 33% risk of a major quake by 2043, officials said.

  • On Thursday morning, the United States Geological Survey recorded a magnitude 3.1 earthquake near Berkeley, striking at 9:23 a.m. about one mile east of the city with a depth of 5.8 miles.
  • Seismologists say the tremor likely occurred on the Hayward Fault, which the UC Berkeley Seismology Lab says has a 33% chance of a 6.7M+ rupture before 2043 and the Bay Area a 72% chance.
  • About an hour before the Great California ShakeOut drill scheduled for 10:16 a.m. Thursday, nearly 500,000 in Alameda County and millions statewide registered, seismologists say.
  • The tremor follows a stronger 4.3 magnitude quake nearly a month earlier that broke windows and knocked items off shelves, while Berkeley plans FEMA-funded Community Emergency Response Team training later this year.
  • Tomorrow, October 17, marks the 36th anniversary of the 6.9M Loma Prieta Earthquake that killed 63 people, MyShake app users will receive a test drill, and NBCBayArea.com/Quakes offers preparedness resources.
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NBC Bay Area broke the news in San Francisco, United States on Thursday, October 16, 2025.
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