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A magnitude 7.4–7.5 earthquake struck off Japan’s northeastern coast on April 20, 2026, at about 16:53 local time, centered in the Pacific near Sanriku at a shallow depth of roughly 10 km.
The Japan Meteorological Agency issued tsunami warnings and advisories for Iwate, Aomori and parts of Hokkaido, forecasting waves as high as three metres; an 80 cm wave was detected at Kuji port in Iwate within an hour.
Local authorities issued evacuation advisories affecting more than 100,000 residents in several prefectures, and Prime Minister Sanae Takaichi said an emergency task force was convened.
Bullet train services in Aomori were suspended, ports prepared for waves and ships moved offshore.
Operators of idled nuclear facilities reported no abnormalities.
Officials warned of possible strong aftershocks over days to weeks and the Cabinet Office and JMA issued an advisory noting a small (about 1%) short-term increase in the chance of a larger “mega-quake” in the region.
Early reports indicated no major structural damage or confirmed casualties, but assessments were ongoing as rescue and monitoring teams continued operations.







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