M5.5 earthquake - 123 km NNE of Atka, Alaska
2179 d ago · 28 Oct 2020, 04:13 UTC 123 km NNE of Atka, Alaska
A tsunami flag was raised for this event. This does not mean a tsunami occurred. Always follow official tsunami warning centres and local authorities.
What happened
A magnitude 5.5 earthquake struck 123 km NNE of Atka, Alaska on 28 Oct 2020, 04:13 UTC at a depth of 240 km.
Earthquakes of this size are classed as Moderate. Can damage poorly built structures close to the epicentre. This was an intermediate-depth earthquake, so shaking is spread over a wider, gentler area.
Timeline
First reported by USGS
16 Oct 2026, 20:47 UTC
Community
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