A magnitude 7.5 (major) earthquake struck 262 km W of Port McNeill, Canada on 1929-05-26 22:40 UTC, at a depth of 15 km. See it live on Earth Live's real-time 3D globe.
Source: USGS event page. The TNT equivalent is computed from the magnitude with the standard Gutenberg–Richter energy relation; all other figures are USGS's own.
In the year before this quake, USGS recorded 1 earthquake of magnitude 2.5 or more within 300 km.
Strongest recorded within 300 km since 1900:
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