Government Agency
Appears in 3 stories
Tsunami warnings lifted; Subsequent Earthquake Advisory active through April 27 for 182 municipalities from Hokkaido to Chiba
A magnitude 7.7 earthquake (revised upward from an initial 7.5) struck 100 kilometers off Japan's Iwate Prefecture on Monday afternoon, along the Sanriku coastline where tsunamis killed tens of thousands in 1896, 1933, and 2011. The Japan Meteorological Agency issued tsunami warnings for waves up to three meters and ordered evacuations for nearly 172,000 people across five prefectures.
Updated May 31
Primary issuer of earthquake, tsunami, and subsequent earthquake advisories
On December 8, 2025, a magnitude 7.6 offshore earthquake struck off Aomori Prefecture in the Sanriku region at 23:15 JST. It shook Hachinohe at a maximum 'upper 6' intensity and triggered tsunami warnings forecasting waves up to three meters for parts of Hokkaido, Aomori, and Iwate.
Updated May 10
Issued tsunami alerts and the first megaquake ‘subsequent earthquake’ advisory after the Sanriku quake
Just before midnight on December 8, a magnitude-7.5 quake hit offshore near Aomori. It shook Hachinohe hard enough to topple furniture, cut power briefly, and send small tsunamis ashore, forcing about 90,000 people to evacuate from coastal towns.
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