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Earthquake Magnitude

Japan Issues Rare Megaquake Advisory as Injuries Rise After M7.5 Off Northern Coast

The alert denotes a roughly 1% one-week risk of an M8+ along the Hokkaido–Sanriku coast.

Tsunami Warnings Downgraded After Magnitude-8.8 Quake Off Kamchatka

Tsunami Watches Lifted After Magnitude 7.4 Quake Sequence Off Kamchatka Peninsula

Tsunami Advisory Canceled After 7.3 Magnitude Quake Off Alaska Peninsula