Alaska earthquakes

M2.5 earthquake 37 km NE of Adak, Alaska

A magnitude 2.5 earthquake struck 37 km NE of Adak, Alaska on Fri, Mar 5, 2021, 1:36 PM HAST (23:36 UTC), 110 km (68 mi) below the surface.

A larger quake followed: M3.5 22 km NNW 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: 2.5 (ml), micro
Local time: Fri, Mar 5, 2021, 1:36 PM HAST
UTC: 2021-03-05 23:36:16 UTC
Depth: 110.1 km (68.4 mi), intermediate-depth
Epicenter: 52.133° N, 176.288° 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 11.5 km horizontally, 7.1 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 184°, poorly surrounded by stations
Stations used: 15

Nearby

Within 100 km, magnitude 1.5 and up: 125 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 125.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000dwg2 (also filed as ak0212y8axog). Read Thu, Sep 24, 2026, 8:41 AM UTC.