A powerful magnitude 7.6 earthquake struck off the coast of Aomori Prefecture at 11:15 PM on December 8, 2025, triggering tsunami warnings and causing widespread disruption across northern Japan. Foreign residents in affected areas should understand the ongoing risks and safety protocols as authorities continue monitoring the situation.

The earthquake, centered 50 kilometers deep in waters east of Aomori, produced the strongest shaking ever recorded in the prefecture. Hachinohe City experienced intensity 6-strong (shindo 6-kyō) tremors, while neighboring municipalities including Oirase and Hashikami towns recorded 6-weak intensity. The quake was felt across Hokkaido, throughout Tohoku, and as far south as Tokyo.

According to NHK, tsunami warnings were initially issued for Hokkaido, Aomori, and Iwate prefectures, with predicted wave heights of up to three meters. The Japan Meteorological Agency downgraded these to tsunami advisories at 2:45 AM on December 9, though coastal residents were urged to remain away from shorelines. Observed tsunami waves reached 30-40 centimeters at multiple locations along the Pacific coast.

Injury reports remain relatively limited given the earthquake's magnitude. The Minister for Disaster Management reported one serious injury and eight minor injuries during a 3:00 AM government disaster response meeting, with four additional injuries of undetermined severity. In Hachinohe, multiple hotel guests sustained injuries, while in Hokkaido's Hidaka region, one woman was injured after slipping on ice while evacuating.

Infrastructure damage has been significant. The Tohoku Shinkansen suspended all service between Fukushima and Shin-Aomori stations, with three trains stranded between stations carrying passengers overnight. According to JR East, no timeline has been established for service resumption. The Hachinohe Expressway closed completely between Hachinohe and Jōbōji interchanges. Power outages affected approximately 3,900 homes in Aomori and 300 in Iwate as of midnight.

Water service disruptions were reported in Mutsu City and Shichinohe Town in Aomori Prefecture. A section of prefectural road in Tōhoku Town collapsed, causing one vehicle to fall into the resulting crater, though the driver escaped with minor injuries. In Aomori City, a fire broke out near a nursery school, with authorities investigating potential earthquake connections.

Critically, the Japan Meteorological Agency and Cabinet Office issued a "Hokkaido-Sanriku Offshore Follow-up Earthquake Advisory" at 2:00 AM on December 9. This marks the first-ever activation of this warning system, indicating elevated risk of another major earthquake along the Japan and Kuril trenches. According to the JMA, the probability of a magnitude 7 or greater earthquake occurring within one week is relatively higher than normal conditions. Residents should maintain heightened preparedness.

Nuclear facilities in the region reported no abnormalities. The Rokkasho reprocessing plant in Aomori experienced minor water overflow but confirmed no external environmental impact. Hokkaido's Tomari Nuclear Power Plant, with all reactors in long-term shutdown, reported no earthquake-related issues.

Prime Minister Takaichi established a crisis response office immediately after the earthquake and dispatched a Cabinet Office investigation team to Aomori. Defense Minister Koizumi ordered Self-Defense Force aircraft and helicopters to conduct aerial damage assessments, reporting no large-scale fires as of midnight.

For foreign residents, authorities emphasize several precautions during this heightened risk period. The JMA warns that earthquakes of similar intensity to the initial shock may occur within one week, with particular caution needed for the first two to three days. Residents should verify emergency supplies, confirm evacuation routes, and monitor official information sources. All Hachinohe City public schools announced closures for December 9.

Expats should be aware that misinformation spreads rapidly after major disasters. NHK specifically warned against fake AI-generated disaster videos and unverified social media reports. Rely on official sources including NHK, local government websites, and the Japan Meteorological Agency for accurate, updated information.

As northern Japan continues recovery efforts and monitoring for potential aftershocks, foreign residents should prioritize safety, maintain emergency preparedness, and follow all official evacuation orders and advisories.