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Japan Earthquake Magnitude Revised to 7.7; Tsunami Warnings Lifted, Mega-Quake Alert Issued
The Pulse
EnvironmentGeneralHOTMonday, April 20, 2026

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

TLDR

  • Japan hit by M7.7 quake on April 20; tsunami warnings now lifted.

  • Authorities warn of M8.0+ mega-quake risk in the coming week.

  • New M6.2 quake struck Hokkaido on April 27; no tsunami, landslide risk.

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.

8 Updates

Update #9\u00b7 Apr 27 · 4:34 AM

Further details have emerged regarding the magnitude 6.2 earthquake that struck Northern Japan's Hokkaido region on April 27th. The tremor occurred shortly before 5:30 a.m. in Hokkaido's southern region. The Japan Meteorological Agency (JMA) reported its depth as 83 kilometers, and it registered an intensity of upper 5 on the Japanese seismic scale in the town of Urahoro, and lower 5 in Niikappu, both in Hokkaido.

Update #8\u00b7 Apr 27 · 2:31 AM

A new earthquake of magnitude 6.2 has struck Northern Japan's Hokkaido region today, April 27th, in the early morning. The Japan Meteorological Agency (JMA) confirmed no tsunami warning was issued for this tremor, and no property damage or casualties have been reported. However, the JMA has warned of an increased risk of rockfalls and landslides in areas that experienced strong shaking. The U.S. Geological Survey (USGS) placed the epicenter 18km west of Sarabetsu, at a depth of 81km.

Update #7\u00b7 Apr 21 · 1:01 PM

Japanese authorities have re-issued a warning for a severe earthquake in the coming week, marking it as the second such warning since tsunami advisories were lifted. They reiterate the potential for a tremor of magnitude 8.0 or higher.

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