Event Brief
Magnitude 5.9 earthquake shakes eastern Japan; no tsunami
By The BriefBrief · Sources (6)
Filed: Aug 23, 2026 at 5:05 AM ET
Summary: A moderate earthquake with a preliminary magnitude of 5.9 struck eastern Japan, including the Tokyo area. No tsunami warning was issued following the quake.
WHO: Japan meteorological authorities
WHAT: A preliminary magnitude 5.9 earthquake shook eastern Japan, including the Tokyo area, and no tsunami warning was issued.
WHEN: Aug 22, 2026 at 3:19 PM ET
WHERE: Japan
WHY: Cause not yet established.
ℹ️ This event is analyzed using pattern arcs, velocity indicators, and source analysis in our MI Console.
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