7.5-Magnitude Quake Off Japan Prompts Tsunami Evacuations

Residents along Japan's northern coast rushed to higher ground Monday evening as a powerful earthquake sent tsunami warnings rippling through a region still marked by memories of past devastation. The 7.5-magnitude tremor struck at 4:52 p.m. local time off the Pacific coast of Iwate prefecture. Waves up to three meters high remained possible even after smaller surges arrived.

Japan Meteorological Agency officials placed the epicenter in the ocean at a depth of 10 kilometers. The quake registered upper 5 on Japan's seismic intensity scale. That level can make standing difficult and collapse unreinforced walls. Two hours later, an 80-centimeter wave had been measured at one port in Iwate prefecture, with a smaller one recorded nearby, according to the agency. Warnings stayed in effect for Iwate, Aomori, parts of Hokkaido and milder advisories for Miyagi and Fukushima.

No casualties or major damage had been reported as night fell, Japan's top government spokesperson Minoru Kihara told reporters. Prime Minister Sanae Takaichi said a crisis management team had been established. She urged those in warned areas to move immediately to high ground or evacuation centers and stay there until alerts lifted. Several port towns, including Otsuchi and Kamaishi — both heavily damaged in the 2011 disaster — ordered evacuations for thousands of residents. Bullet train services halted across affected lines. Some motorways closed.

The agency cautioned that large aftershocks could strike for days or weeks. Operators of idled nuclear facilities in the region, including those run by Hokkaido Electric Power and Tohoku Electric Power, reported no abnormalities. The tremor occurred in the Ring of Fire, where Japan experiences roughly one-fifth of the world's magnitude-6.0 or greater earthquakes. The 2011 magnitude-9.0 event and its tsunami killed about 18,500 people, displaced hundreds of thousands and triggered meltdowns at Fukushima.

A 7.5-magnitude quake in December had injured dozens in the same general area. This time the immediate human toll appeared limited. Yet the gap between expected three-meter waves and those observed so far left one central tension unresolved: whether the threat had largely passed or whether further surges and aftershocks could still test Japan's preparedness. Live footage from public broadcaster NHK showed calm port areas with no visible destruction in the first hours. Officials continued assessing impacts.

The Japan Meteorological Agency emphasized that even smaller tsunamis can flood low-lying buildings and sweep people away in currents. Its advice was direct. Evacuate coastal and riverside zones. Do not return until the warning ends. That message, broadcast on television and phones across the country, reflected a system refined after 2011. Then, as now, early alerts gave people precious minutes. This time the sea rose modestly. The ground, however, keeps its habits. Aftershocks remain a concern. So does the long shadow of the Nankai Trough, where stronger events have been feared in recent years. For now the story is one of urgent movement, official caution and an outcome still coming into focus.