Major 7.5 Magnitude Earthquake Strikes Northern Japan, Triggering Tsunami Warnings and Mass Evacuations

December 09, 2025
 

A strong earthquake measuring 7.5 on the Richter scale hit off the northern coast of Japan late on Monday. This prompted immediate tsunami warnings and evacuations across several coastal prefectures. 

The tremor happened shortly after 11:15 p.m. local time. The epicenter was about 80 kilometers offshore from Aomori Prefecture at an estimated depth of 50 to 54 kilometers, according to the Japan Meteorological Agency (JMA).

Tsunami Warnings and Public Evacuations

The JMA issued tsunami warnings for Hokkaido, Aomori, and Iwate Prefectures, after the quake. The residents were warned about possible waves reaching up to 3 meters. Evacuation orders were given for around 90,000 residents in low-lying coastal areas. 

Sirens, emergency broadcasts, and local officials urged residents to move to higher ground. Shelters opened throughout the region. 

Tsunami Activity Lower Than Initially Feared

Despite the serious warnings, the tsunami waves observed along affected coastlines were much smaller than expected. Recorded waves ranged from 20 to 70 centimeters, which is far below the three-meter threshold that was previously feared. 

As a result, authorities later downgraded the tsunami warnings to advisories. However, they continued to urge caution due to the risk of aftershocks. 

Injuries and Infrastructure Disruptions

At least 23 people were reported injured, mostly from falling objects and minor structural damage. Many households faced temporary power outages, transport services, including regional rail lines and high-speed Shinkansen routes, were halted while safety inspections took place. 

Airports in northern Japan also experienced minor operational delays as officials checked runways and terminals for potential damage. 

Safety inspections at Nuclear and Industrial Facilities

Authorities quickly carried out inspections at nuclear plants and industrial facilities across the affected prefectures. No major damage or radiation concerns were reported. However, there was a small water spill at one reprocessing facility. Officials confirmed that this incident did not pose a safety threat. 

Risk of Aftershocks Remains

The JMA warned that strong aftershocks are likely in the coming days. Residents should stay alert, secure heavy household items, and follow the updated guidance from local officials. 

Japan sits along the seismically active Pacific “Ring of Fire” and experiences frequent earthquakes. Monday night’s tremor is one of the strongest recorded in the country this year.