7.6-magnitude undersea earthquake struck off the coast of Aomori Prefecture

On December 8, 2025, a 7.6-magnitude undersea earthquake struck off the coast of Aomori Prefecture, shaking large parts of Japan’s Tohoku and Hokkaido regions late at night. The quake occurred at a depth of roughly 50 km and produced violent shaking, with seismic intensity reaching “upper-6” on Japan’s shindo scale.

Within minutes, the Japan Meteorological Agency (JMA) issued tsunami warnings for Aomori, Hokkaido, and Iwate, urging residents in coastal communities to move immediately to higher ground. Forecasts predicted waves of up to 3 meters, creating an urgent evacuation situation.

Early observations recorded tsunami waves between 20 and 50 centimeters at several ports, including Mutsu-Ogawara in Aomori and Urakawa in Hokkaido. Authorities cautioned that initial waves are often not the largest and instructed residents to remain evacuated until official all-clear notices are issued.

Transport services across the region were disrupted, with several train lines suspended for safety inspections. Nuclear facilities conducted precautionary checks, and emergency teams were deployed to assess coastal areas and support evacuation efforts.

Japan, located along the seismically active Pacific “Ring of Fire,” experiences frequent earthquakes. This latest event underscores the continued need for preparedness, rapid response systems, and strong infrastructure in one of the world’s most earthquake-prone nations.

Authorities continue to monitor sea levels and aftershocks as residents await updates on when it will be safe to return home.