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43m ago

Japan Issues Rare Megaquake Advisory After M7.5 Offshore Quake as Tsunami Alerts Are Lifted

Officials put the short-term chance of an M8+ event at about 1%, urging preparedness across 182 coastal municipalities.

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A vehicle rests on the edge of a collapsed road in Tohoku town in Aomori Prefecture on Dec. 9, 2025, following a 7.5 magnitude earthquake off northern Japan. The quake on Dec. 8 left at least 30 injured, authorities said, damaging roads and leaving thousands without power in freezing temperatures.
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Overview

  • Japan’s weather agency lifted tsunami alerts after observing waves of 20–70 cm at several ports, including a 70 cm surge at Kuji in Iwate.
  • A weeklong megaquake advisory now covers the Pacific coast from Hokkaido to Chiba, reflecting elevated short‑term risk along the Japan and Chishima trenches.
  • Authorities emphasize the notice is not a prediction, asking residents to review evacuation plans, secure furniture, and keep emergency kits ready.
  • Injuries total at least 34 with no deaths reported, with some regional tallies citing 39 as damage assessments continue.
  • Nuclear plants reported no abnormalities after checks, about 800 homes briefly lost power, and Shinkansen services were suspended before resuming.