Alaska earthquakes

M3.3 earthquake 190 km WSW of Adak, Alaska

A magnitude 3.3 earthquake struck 190 km WSW of Adak, Alaska on Wed, Mar 10, 2021, 3:12 PM HAST (01:12 UTC), 68 km (42 mi) below the surface.

A larger quake followed: M4.3 225 km W 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: 3.3 (ml), minor
Local time: Wed, Mar 10, 2021, 3:12 PM HAST
UTC: 2021-03-11 01:12:41 UTC
Depth: 68.2 km (42.4 mi), shallow
Epicenter: 51.506° N, 179.331° 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 13.5 km horizontally, 16.3 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 211°, poorly surrounded by stations
Stations used: 49

Nearby

Within 100 km, magnitude 1.5 and up: 72 in the 60 days after this one and 71 in the 30 days before it.

After

The first 60 of 72.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000e1wq (also filed as ak02137sae7w). Read Thu, Sep 24, 2026, 12:17 PM UTC.