Japan Earthquake Alert: Powerful 7.7 Quake Strikes Sanriku Coast, Tsunami Warning Issued and Megaquake Risk Raised

Japan earthquake alert map showing tsunami warning zones along the Sanriku coast on April 20, 2026

The quake hit on Monday at 4:53 p.m. local time off Iwate prefecture on the Pacific coast, according to the Japan Meteorological Agency (JMA). It was felt across a wide area, shaking buildings in Tokyo, hundreds of kilometres to the south. This powerful disturbance originated at a relatively shallow depth of 19 kilometres, and the […]

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