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Magnitude 5.6 earthquake shakes Northern California, triggers alert across Bay Area

ShakeAlert sent nearly 657,000 cellphone warnings as the 5.6 quake triggered aftershocks, minor damage and scattered outages, officials said.

  • On Wednesday, a 5.6-magnitude earthquake struck Northern California at 8:10 a.m. near Redwood Valley in Mendocino County, according to the U.S. Geological Survey.
  • Moderate shaking rippled from Humboldt County to Sonoma County, triggering the USGS ShakeAlert system on many mobile phones across the region.
  • California Governor Gavin Newsom was briefed on the situation, while utility crews worked to restore power for 3,145 customers in Willits with no major injuries reported.
  • The National Tsunami Warning Center confirmed no tsunami danger, while the USGS reported a preliminary 2.5-magnitude aftershock occurring about seven minutes later.
  • With tectonic stress in California reaching critically high levels, scientists emphasize preparing 72-hour emergency kits with food, water, and medication for future seismic events.
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Footage shows shaking, damage from magnitude 5.6 quake in California

Videos show food and wine shaken from grocery store shelves during a magnitude 5.6 earthquake that struck in Northern California on Wednesday morning.

·Albuquerque, United States
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NBC Bay Area broke the news in San Francisco, United States on Wednesday, June 24, 2026.
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