Alaska earthquakes

M2.5 earthquake 191 km SSE of Atka, Alaska

A magnitude 2.5 earthquake struck 191 km SSE of Atka, Alaska on Fri, Apr 23, 2021, 9:11 AM HADT (18:11 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.7 126 km SSE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.5 (ml), micro
Local time: Fri, Apr 23, 2021, 9:11 AM HADT
UTC: 2021-04-23 18:11:07 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.729° N, 172.761° 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 7.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 320°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 4 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 us7000e4x9 (also filed as ak021576ieb8). Read Thu, Sep 24, 2026, 8:42 AM UTC.