Alaska earthquakes

M3.8 earthquake 93 km ESE of Adak, Alaska

A magnitude 3.8 earthquake struck 93 km ESE of Adak, Alaska on Fri, Apr 23, 2021, 4:26 PM HADT (01:26 UTC), 50 km (31 mi) below the surface.

A larger quake followed: M3.9 55 km SSE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.8 (mb), minor
Local time: Fri, Apr 23, 2021, 4:26 PM HADT
UTC: 2021-04-24 01:26:28 UTC
Depth: 49.5 km (30.8 mi), shallow
Epicenter: 51.670° N, 175.327° 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 6.3 km horizontally, 2.3 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 144°
Stations used: 74

Nearby

Within 100 km, magnitude 1.5 and up: 46 in the 60 days after this one and 84 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 us6000e47v (also filed as ak02158k0mp5). Read Fri, Sep 25, 2026, 1:33 PM UTC.