A strong earthquake measuring magnitude 6.7 struck off the coast of northern Japan on Sunday evening, triggering a tsunami advisory for coastal regions and prompting authorities to urge residents to stay alert.
Where and When the Quake Hit
The quake hit at approximately 5:03 p.m. local time near the Sanriku coast, off the shores of Iwate Prefecture in northeastern Japan. The epicentre was located under the Pacific Ocean at a shallow depth of around 10 km, which helped intensify the shaking in nearby coastal zones.
What the Emergency Warnings Said
The Japan Meteorological Agency (JMA) promptly issued a tsunami advisory, warning that waves could reach up to 1 metre (3 feet) along the coast. Some localised areas were indicated to possibly face waves up to 3 metres (about 10 feet) in worst-case scenarios. Residents in coastal towns of Iwate were urged to move to higher ground immediately and avoid low-lying shoreline areas.
Impact and Aftermath
While the shaking was clearly felt in the Iwate and nearby regions, there have been no immediate reports of major structural damage or casualties. Systems at nearby nuclear plants remain normal, according to local authorities. Coastal monitoring stations recorded minor waves of 10-20 centimetres (4-8 inches) in some areas, far lower than the maximum suggested heights.
The advisory was later lifted after about three hours, though officials continue to caution that aftershocks may follow and the region remains under watch.
Why This Region Is Prone to Quakes
Japan lies along the Pacific Ring of Fire, a zone of frequent seismic activity where tectonic plates converge and subduct. The northeastern coast, including Iwate Prefecture, has experienced major quakes before — and the local readiness for earthquakes and tsunamis is well developed. Shallow-depth earthquakes like this one are particularly dangerous because the energy transfers quickly to the surface, increasing the likelihood of strong shaking and triggering tsunami potential.
What to Do If You’re in a Tsunami Advisory Area
If you live near the coast or are visiting a seaside area, it’s very important to know what to do when a tsunami warning is issued.
As soon as you feel strong shaking or hear a tsunami alert, move to higher ground right away. Don’t wait or stop to collect belongings — every minute matters.
Do not go back to the beach or coastline until the government or local authorities say it’s safe. Even small waves can be dangerous after an earthquake.
Keep listening to official announcements or weather updates from Japan’s Meteorological Agency or local news. They’ll share real-time safety information.
Also, be careful of aftershocks — smaller earthquakes that can follow the main one. Sometimes, they can trigger new waves.
In this case, the tsunami waves were small, but the warning showed how important it is to act fast. Staying aware and following safety instructions can save lives.