Event Brief
Dec 11, 2025 at 11:08 AM ET
Japan’s Megaquake Advisory Explained
By The BriefBrief
A megaquake is significantly stronger than a 7-magnitude quake.
WHO: Japan Meteorological Agency
WHAT: Megaquake advisory issued
WHEN: Dec 10, 2025 at 7:00 PM ET
WHERE: Japan
WHY: To prepare for potential seismic events
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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