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Japan Earthquake Magnitude Revised to 7.7; Tsunami Warnings Lifted, Mega-Quake Alert Issued
The Pulse
EnvironmentGeneralHOT5h ago

Japan Earthquake Magnitude Revised to 7.7; Tsunami Warnings Lifted, Mega-Quake Alert Issued

TLDR

  • Japan struck by 7.7 magnitude earthquake on April 20, 2026.

  • 3-meter tsunami waves made landfall; warnings now lifted.

  • JMA warns of potential mega-quake across 182 cities.

  • Seven prefectures urged to prepare for future disaster.

A 7.4 magnitude earthquake struck off the northeastern coast of Japan on Monday, April 20, 2026, at a depth of 10 kilometres. The Japan Meteorological Agency (JMA) subsequently issued a tsunami warning for Iwate Prefecture, parts of Hokkaido, and Aomori Prefecture, anticipating waves up to 3 meters high. A tsunami advisory was also issued for Hokkaido, Aomori, Miyagi, and Fukushima prefectures. Following the quake, the Tohoku Shinkansen bullet train service was suspended between Tokyo and Shin-Aomori stations. Local broadcasters urged residents in affected coastal areas to evacuate to higher ground, recalling past disaster events.

3 Updates

Update #4\u00b7 Apr 20 · 1:01 PM

The earthquake's magnitude has been further revised to 7.7 on the Richter scale. While tsunami warnings have now been lifted, advisories remain in effect. The Japan Meteorological Agency has issued an alert for a potential mega-quake, citing an increased probability along two deep-sea trenches in the Pacific Ocean. This alert covers 182 cities and towns from Hokkaido to Chiba, with residents in seven prefectures urged to prepare for disaster. The quake registered an intensity of upper 5 on the Japanese scale.

Update #3\u00b7 Apr 20 · 11:18 AM

The earthquake's magnitude has been slightly revised to 7.4 on the Richter scale. Tsunami waves of approximately 10 feet (3 meters) have now been reported to have made landfall.

Update #2\u00b7 Apr 20 · 10:02 AM

The earthquake's magnitude has been updated to 7.5. First tsunami waves have been recorded, with heights of 40cm in Miyako port and 80cm elsewhere. Warnings for waves up to 3 meters remain for Iwate, Hokkaido, and Aomori prefectures. As a safety measure, Shinkansen services have been suspended. The epicenter was located 100km off the Sanriku coast at a depth of 10km. Japanese Prime Minister Sane Takaichi has urged residents to move to higher ground.

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