Event Brief
Dec 20, 2025 at 2:07 AM ET
San Francisco Hit by 4.0 Magnitude Earthquake Swarm
By The BriefBrief
A 4.0 magnitude earthquake rattled San Francisco, part of a swarm affecting the region, raising concerns among residents.
WHO: Residents of San Francisco
WHAT: 4.0 magnitude earthquake and ongoing seismic swarm
WHEN: Dec 19, 2025 at 7:00 PM ET
WHERE: San Francisco, CA
WHY: To inform the public about seismic activity and safety measures
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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