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Japan Issues Rare Megaquake Advisory After 7.5 Quake Off Northern Coast

Officials describe the notice as a precaution with about a 1% short‑term chance of a larger quake.

Overview

  • Japan lifted tsunami alerts after modest surges of 20–70 cm were observed along ports from Aomori to Hokkaido.
  • Authorities reported roughly three dozen injuries and a residential fire, ordered or urged evacuations for about 90,000 people, and found no deaths.
  • The advisory covers 182 municipalities from Hokkaido to Chiba for about a week and is not a prediction of an imminent event.
  • Rail and air travel saw temporary disruptions, some Shinkansen segments paused for inspections, and utilities reported short-lived power and water outages.
  • Prime Minister Sanae Takaichi activated an emergency task force as nuclear operators reported no abnormalities at regional plants.