Overview
- The offshore quake struck near Misawa in Aomori at 11:15 p.m. local time, with the magnitude revised to 7.5 and a depth of about 50–54 kilometers.
- Tsunami advisories issued for Aomori, Iwate and Hokkaido were downgraded within hours and fully lifted by early Tuesday, with the highest observed wave around 70 centimeters at Kuji.
- Prime Minister Sanae Takaichi reported about 30 injuries and no confirmed fatalities, as emergency inspections and damage assessments continued across northern prefectures.
- The Japan Meteorological Agency issued a first-of-its-kind advisory under a 2022 system, citing an elevated short-term chance of a major quake and urging residents to keep evacuation plans and supplies ready.
- Operators reported no abnormalities at nuclear facilities in Aomori, Miyagi, Fukushima and Hokkaido, while coastal evacuations, temporary Tohoku Shinkansen suspensions and localized power outages were recorded.