Story perspectives

Japan Issues Mega-Quake Alert as 7.7 Quake Strikes, No Casualties

4/23/2026

Summary

Story summary

Japan’s government issued a one-percent probability mega-quake advisory for the northern coast, the first since December.
A magnitude 7.7 quake struck off northeastern Japan on 20 April 2026, with officials reporting no major injuries.
The Japan Meteorological Agency warned of up to three-metre tsunami waves, then downgraded the alert after 80-centimetre waves were recorded.
About 100 households lost power, with service restored by nightfall and no casualties.

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Story summary

Japan’s government issued a one-percent probability mega-quake advisory for the northern coast, the first since December.
A magnitude 7.7 quake struck off northeastern Japan on 20 April 2026, with officials reporting no major injuries.
The Japan Meteorological Agency warned of up to three-metre tsunami waves, then downgraded the alert after 80-centimetre waves were recorded.
About 100 households lost power, with service restored by nightfall and no casualties.