Foreign residents in northern Japan are navigating a period of heightened seismic activity following a series of significant earthquakes in December 2024, with authorities urging continued vigilance as infrastructure damage assessments reveal the extent of impact across the region.

On December 8, a magnitude 7.5 earthquake struck off the coast of Aomori Prefecture, registering a strong 6+ (shindo 6-kyō) in Hachinohe City. Just four days later on December 12, another magnitude 6.9 earthquake hit the same area, triggering tsunami warnings along the Pacific coast from Hokkaido to Miyagi Prefecture. According to NHK, the Japan Meteorological Agency issued tsunami advisories that were lifted by 2:05 PM on December 12, though experts warn that seismic activity remains elevated in the region.

The earthquakes have exposed critical infrastructure vulnerabilities. In Hachinohe, a telecommunications tower owned by NTT East Japan sustained damage during the December 8 quake. Aomori Governor Miyashita publicly criticized the company's response, stating that repair work had not yet begun despite the ongoing risk. NTT East Japan has been conducting drone inspections to assess the damage, and fortunately, the December 12 earthquake caused no additional structural harm to the tower. However, a nearby kindergarten and high school were forced to close temporarily due to safety concerns.

Transportation infrastructure has also suffered significant damage. JR East's Hachinohe Line elevated railway sustained serious structural damage, with experts warning that repairs could take considerable time. According to railway specialists cited by NHK, the bridge piers show damage to both reinforcing steel bars and internal concrete, complicating restoration efforts. Separately, on the Akita Nairiku Line, a train derailed after apparently colliding with fallen trees, plunging 6-8 meters from a bridge. The driver was injured, though no passengers were aboard.

For expats living in affected areas, the earthquakes have highlighted practical challenges in emergency response. Traffic analysis of Hachinohe immediately following the December 8 quake revealed congestion at six locations, including major roads and routes leading to evacuation centers on higher ground. This congestion could impede evacuation efforts during future emergencies, particularly for those unfamiliar with alternative routes.

The Japan Meteorological Agency has maintained a "post-event earthquake advisory" (kōhatsu jishin chūi jōhō) for the Kuril and Japan Trench areas, urging residents to review their disaster preparedness. However, officials clarified that the December 12 earthquake does not itself trigger additional post-event advisories, as it falls within the expected aftershock sequence.

Critical facilities have largely remained secure. Nuclear power plants in the region—including Higashidōri, Onagawa, Tomari, and the decommissioned Fukushima Daiichi—reported no abnormalities following either earthquake. In Mutsu City, Mutsu General Hospital experienced water leaks during the December 8 quake but has since begun returning patients who were temporarily transferred to other facilities.

Experts continue to analyze structural failures from previous disasters. A government committee investigating the 2024 Noto Peninsula earthquake determined that a building collapse in Wajima City, Ishikawa Prefecture, resulted from multiple factors, including foundation pile failure during seismic shaking. These findings underscore the importance of building standards and regular structural assessments.

For foreign residents in northern Japan, authorities recommend maintaining emergency supplies, identifying multiple evacuation routes to avoid congestion, and staying informed through official channels like the JMA website and local government alerts. With seismic activity expected to continue, preparedness remains essential for navigating this challenging period safely.