A powerful 6.7-magnitude earthquake struck off the northern coast of Japan on Friday, heightening concerns in a region already reeling from a stronger quake earlier in the week. The Japan Meteorological Agency (JMA) revised its initial estimate of the tremor from 6.5 to 6.7 after assessing seismic data, and issued a warning that tsunami waves of up to one metre could reach parts of the northern Pacific coastline.
The offshore quake was recorded only days after a 7.5-magnitude earthquake hit the same area, injuring at least 50 people and damaging roads, buildings and critical infrastructure. Local authorities have spent the past several days assessing structural damage, repairing power lines and restoring transport networks. Friday’s tremor added fresh urgency to ongoing emergency measures, prompting officials to advise residents in coastal towns to stay alert for rising sea levels and potential aftershocks.
The JMA said the latest quake originated at a considerable depth offshore, a factor that reduced the likelihood of widespread tsunami destruction but still posed risks to low-lying regions. Coastal communities in Hokkaido and parts of Aomori Prefecture were instructed to move away from beaches and riversides, while emergency broadcast systems urged vessels near the shoreline to head to deeper waters.
Rail operators in the north temporarily suspended some services to conduct safety inspections, and airports in the region initiated standard runway checks. Authorities also reported scattered power outages, though most were restored quickly. No major damage had been confirmed in the immediate aftermath, but officials stressed that assessments were ongoing.
Prime Minister Fumio Kishida’s office said disaster response teams were monitoring developments closely and coordinating with local governments. Fire and rescue units were placed on standby, while the Self-Defense Forces were instructed to prepare for potential deployment should communities report significant damage.
Residents described the quake as strong enough to shake buildings for several seconds, with many still recovering emotionally from Monday’s larger tremor. Supermarkets, schools and public offices that had just reopened after completing inspections faced renewed concerns as structural engineers prepared for another round of checks.
The series of earthquakes has raised broader questions about seismic resilience in Japan’s northern regions, where population centres are spread across both coastal and mountainous terrain. Japan sits on multiple tectonic plates and experiences thousands of earthquakes each year, but back-to-back major quakes have put pressure on local authorities already stretched by recovery efforts.
As the JMA continues to track seismic activity, officials are encouraging the public to remain cautious but calm, reminding residents that aftershocks are common in the days and weeks following major events. Emergency shelters remain available for those unwilling to return home until the situation stabilises.
