Powerful 7.4-Magnitude Earthquake Hits Northern Japan Triggering Three-Meter Tsunami Warning

Northern Japan struck by a 7.4-magnitude earthquake. Tsunami warnings issued for Hokkaido, Aomori, and Iwate with 3-meter waves expected. Evacuations underway.

By: AXL Media

Published: Apr 20, 2026, 4:41 AM EDT

Source: Information for this report was sourced from Türkiye Today

Massive Seismic Event Rattles Pacific Coast

The Pacific coast of northern Japan was struck by a powerful 7.4-magnitude earthquake at 4:53 p.m. local time on April 20, 2026. According to the Japan Meteorological Agency (JMA), the epicenter was located off the coast of Iwate Prefecture at a significant depth. The tremors were felt as far south as Tokyo, where skyscrapers and large office buildings were reported to have swayed for several minutes. Early reports indicate that the seismic intensity was sufficient to disrupt high-speed rail services and trigger automatic shutdowns at regional power facilities as a precautionary measure.

Urgent Tsunami Warnings for Three Coastal Prefectures

Immediately following the quake, the JMA escalated its alert status to a full tsunami warning for three primary regions: Iwate Prefecture, Aomori Prefecture’s Pacific coast, and Hokkaido’s central Pacific coast. Forecasters warned that waves as high as three meters could strike the shoreline repeatedly. The agency emphasized that the first waves are often not the largest and that the threat can persist for several hours. Local municipalities have activated emergency sirens and broadcast systems to ensure that maritime vessels and coastal residents are aware of the impending surge.

Evacuation Orders Issued as Wave Arrival Times Noted

Authorities have issued "evacuate immediately" orders for tens of thousands of residents in the warning zones. In Iwate Prefecture, waves were expected to reach the cities of Miyako and Kamaishi by 11:10 a.m. (local arrival estimate adjustment). In Aomori, Hachinohe Port and Mutsu City were identified as high-risk areas with anticipated wave arrivals shortly thereafter. Emergency management officials stressed that the estimated arrival times are only approximations and that the actual tsunami could arrive sooner or later depending on the underwater topography.