Tsunami Warning Issued After 7.4 Magnitude Earthquake Hits Japan

A tsunami warning was issued for northeast and northern Japan after a magnitude-7.4 earthquake struck off the Sanriku Coast on Monday afternoon, prompting evacuation orders and heightened alert levels across Hokkaido and Iwate prefectures.

The Japan Meteorological Agency reported the quake occurred at 4:53 p.m. Local time, with its epicentre located approximately 10 kilometres beneath the Pacific Ocean off the coast of Iwate Prefecture. The agency initially issued a tsunami warning for coastal areas of Hokkaido and Iwate, forecasting waves potentially reaching up to three metres in height.

Authorities urged residents in affected zones to evacuate immediately to higher ground or designated shelters, emphasizing that the first waves were already approaching the coastline and could arrive in multiple successive surges. The warning remained in effect for several hours as monitoring agencies tracked sea level changes in real time.

No immediate reports of casualties or significant structural damage were confirmed by local authorities in the hours following the quake. However, transportation services, including portions of the Tohoku Shinkansen line and local rail networks, were temporarily suspended as a precautionary measure. Airports in the region also halted flights temporarily while safety assessments were conducted.

The Sanriku Coast, known for its ria coastline and vulnerability to tsunamis, has a history of seismic activity. It was severely impacted by the 2011 Great East Japan Earthquake and tsunami, which triggered a nuclear disaster at the Fukushima Daiichi power plant. Since then, Japan has upgraded its early warning systems, coastal defences, and evacuation protocols to improve resilience against such events.

As of Monday evening, the tsunami warning had been downgraded to an advisory in some areas, with officials continuing to monitor tidal levels. The Japan Meteorological Agency advised the public to remain cautious and follow instructions from local authorities, noting that minor sea level fluctuations could persist even after the main threat had passed.

Seismologists noted that while the quake was strong, its offshore location and depth helped limit the potential for widespread destruction on land. The event served as a reminder of the ongoing seismic risks faced by Japan, which sits atop the convergence of several major tectonic plates.

News Directory 3 will continue to monitor developments and provide updates as official information becomes available from Japanese authorities and verified sources.