A powerful earthquake struck off the coast of Japan’s Iwate Prefecture on Sunday evening, prompting the Japan Meteorological Agency (JMA) to issue a tsunami advisory for the region. The tremor, initially reported as magnitude 6.7 and later revised to 6.9, occurred at 5:03 p.m. local time and triggered warnings of potential tsunami waves up to one metre high along the coastline.
The quake struck off the eastern coast of Honshu at a shallow depth of around 10 to 16 kilometres, according to JMA estimates. In the city of Morioka and surrounding towns, the shaking registered at “shindo 4” on Japan’s seismic intensity scale — a level at which lights may swing and unsecured objects can topple. Immediately after the quake, the JMA issued a tsunami advisory for the Iwate coast, warning of waves potentially up to one metre. Small tsunami waves of about 20 centimetres were observed in ports such as Ofunato and Kuji.
While no major damage or injuries were initially reported, the earthquake did cause some disruptions. Certain services on the Tōhoku Shinkansen bullet train line were briefly suspended between Sendai and Shin-Aomori stations due to a power cut triggered by the quake. Authorities confirmed that nearby nuclear power plants did not report any abnormalities. Power outages were reported in parts of Iwate and Aomori, but most were restored within hours as emergency crews worked to assess infrastructure conditions.
The tsunami advisory was lifted after roughly three hours, once the tsunami threat was deemed to have subsided. Nonetheless, the JMA warned that aftershocks and further quakes remain possible in the coming days. Experts noted that the Sanriku coastal region, including Iwate, sits in one of Japan’s most seismically active zones because of the subduction of the Pacific Plate beneath the Eurasian Plate.
Japan is no stranger to seismic disasters. The 2011 magnitude-9.0 earthquake and ensuing tsunami devastated parts of the Tōhoku region, including Iwate and neighbouring prefectures, and triggered the nuclear accident at Fukushima. While Sunday’s event was much smaller in scale, it serves as a reminder of the region’s ongoing vulnerability and the importance of maintaining strict safety and evacuation measures.
Sunday’s earthquake off Iwate Prefecture triggered a timely tsunami advisory, caused brief infrastructure disruptions, and prompted authorities to remain vigilant for further tremors. Although the observed tsunami waves were minor and no immediate damage was reported, the incident underscores the continuing seismic risk in Japan’s northeast coastal zone. Residents and visitors are urged to stay alert, heed official warnings, and remain aware of evacuation protocols in the event of larger aftershocks or future tsunami-generating events.
