7.5-Magnitude Earthquake Strikes Off Japan, Triggers Tsunami Warnings

A major earthquake with a magnitude of 7.5 struck off the northeastern coast of Japan on April 20, 2026, at approximately 4:53 p.m. local time (07:53 UTC) ^[1][2]. The Japan Meteorological Agency (JMA) reported the quake’s epicenter in the Pacific Ocean near Iwate Prefecture, at a depth of about 10 kilometers ^[1][3].

Following the earthquake, tsunami warnings were issued for the Iwate, Aomori, and Hokkaido prefectures, with potential wave heights reaching up to 3 meters ^[1][4]. Within an hour, tsunami waves of approximately 80 centimeters were detected at Kuji Port in Iwate Prefecture ^[5][6].

Prime Minister Sanae Takaichi established an emergency task force and urged residents in the affected areas to evacuate to higher ground ^[1][7]. In response to the earthquake, bullet train services in Aomori were suspended as a precautionary measure ^[1][8].

The quake registered an “upper 5” on Japan’s seismic intensity scale, indicating strong shaking in the affected regions ^[1][9].

What Is Known

The earthquake’s magnitude was confirmed at 7.5 by the Japan Meteorological Agency, with initial estimates ranging between 7.4 and 7.7 ^[1][2]. Tsunami warnings remain in effect for several coastal areas, and authorities are closely monitoring the situation ^[1][4].

What Remains Unclear

While the immediate impact of the tsunami waves has been observed, the full extent of potential damage and any casualties remain unclear at this time. Further assessments are underway to determine the earthquake’s broader effects on infrastructure and communities in the region ^[1][5].