Alaska earthquakes

M4.1 earthquake 71 km SSW of Adak, Alaska

A magnitude 4.1 earthquake struck 71 km SSW of Adak, Alaska on Fri, Feb 19, 2021, 5:33 AM HAST (15:33 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.4 44 km SE 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: 4.1 (mb), light
Local time: Fri, Feb 19, 2021, 5:33 AM HAST
UTC: 2021-02-19 15:33:08 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.252° N, 176.867° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.3 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 96°
Stations used: 78

Nearby

Within 100 km, magnitude 1.5 and up: 158 in the 60 days after this one and 95 in the 30 days before it.

After

The first 60 of 158.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000dixq (also filed as ak0212axzy6w). Read Sat, Sep 26, 2026, 6:31 PM UTC.