Alaska earthquakes

M2.5 earthquake 120 km E of Atka, Alaska

A magnitude 2.5 earthquake struck 120 km E of Atka, Alaska on Sat, Apr 17, 2021, 6:44 AM HADT (15:44 UTC), 102 km (63 mi) below the surface.

A larger quake followed: M2.8 190 km E of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.5 (ml), micro
Local time: Sat, Apr 17, 2021, 6:44 AM HADT
UTC: 2021-04-17 15:44:03 UTC
Depth: 101.8 km (63.3 mi), intermediate-depth
Epicenter: 52.233° N, 172.441° 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 15.7 km horizontally, 17.8 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 194°, poorly surrounded by stations
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 19 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 us7000e2nf (also filed as ak0214x7p2nd). Read Thu, Sep 24, 2026, 5:40 AM UTC.