Tsunami waves measuring 80 centimetres reached the northern Japanese coastline on Monday following a powerful 7.4-magnitude earthquake that struck off the coast of Iwate Prefecture.
The Japan Meteorological Agency (JMA) confirmed that the first surges hit the port of Kuji approximately 40 minutes after the initial tremor, which occurred at 4:53 pm.
While the initial waves measured under a metre, authorities have maintained a high-alert status, warning that waves could eventually reach heights of three metres. Residents in coastal and riverside areas have been ordered to move to higher ground or dedicated evacuation buildings immediately. “Tsunami waves are expected to hit repeatedly. Do not leave safe ground until the warning is lifted,” the JMA stated, emphasizing that the danger has not passed.
The earthquake was powerful enough to shake skyscrapers in Tokyo, hundreds of kilometres away.
Prime Minister Sanae Takaichi's office has activated a crisis management centre to coordinate emergency responses. Although early footage from broadcaster NHK showed no immediate large-scale destruction at local ports, the government is working to confirm reports of injuries or property damage.
This seismic activity follows a period of heightened anxiety in Japan, coming after recent “megaquake” advisories that have kept the nation on edge.