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At about 16:53 local time on April 20, 2026, a powerful earthquake of preliminary magnitude 7.4–7.5 struck in the Pacific Ocean off the Sanriku coast of northern Japan at a shallow depth of roughly 10 km, the Japan Meteorological Agency said.
The tremor registered an “upper 5” on Japan’s intensity scale and was felt as far as Tokyo.
JMA issued tsunami warnings for Iwate, Aomori and parts of Hokkaido, warning of waves up to three metres; first waves were reported, including an 80‑centimetre surge at Kuji port and smaller swells at Miyako and Hachinohe.
Prime Minister Sanae Takaichi said a crisis management task force was activated and urged coastal residents to evacuate to higher ground.
Rail services, including the Tohoku Shinkansen, were suspended, vessels moved out of ports, and utilities and plant operators performed safety checks at nearby nuclear facilities with no immediate abnormalities reported.
Authorities warned of repeated tsunami waves and aftershocks; local emergency responses and damage assessments are ongoing.








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