Event Brief
Dec 9, 2025 at 4:05 AM ET
Long-period ground motion felt in eastern Japan
By The BriefBrief
Residents experienced long, slow shakes due to a type of quake affecting tall buildings.
WHO: Residents of eastern Japan
WHAT: Long-period ground motion earthquake
WHEN: Dec 8, 2025 at 7:00 PM ET
WHERE: Eastern Japan
WHY: Natural seismic activity
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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