Alaska earthquakes

M3.3 earthquake 274 km SW of Adak, Alaska

A magnitude 3.3 earthquake struck 274 km SW of Adak, Alaska on Sat, Oct 10, 2020, 12:10 PM GMT-12 (00:10 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.9 182 km WSW of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Sat, Oct 10, 2020, 12:10 PM GMT-12
UTC: 2020-10-11 00:10:26 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.417° N, 179.809° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.3 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.12
Depth from: Operator assigned
Station coverage gap: 265°, poorly surrounded by stations
Stations used: 23

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 18 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c9pa (also filed as ak020d3c842x). Read Tue, Sep 29, 2026, 11:52 PM UTC.