Alaska earthquakes

M3.0 earthquake 11 km NNW of Four Mile Road, Alaska

A magnitude 3.0 earthquake struck 11 km NNW of Four Mile Road, Alaska on Sun, Oct 10, 2021, 4:05 AM AKDT (12:05 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M4.1 31 km SW of Salcha, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.0 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Sun, Oct 10, 2021, 4:05 AM AKDT
UTC: 2021-10-10 12:05:10 UTC
Depth: 21.2 km (13.2 mi), shallow
Epicenter: 64.692° N, 149.245° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.0	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.2	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.039 · 88 stations

Did you feel it?

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

How well it is located

Reviewed by a seismologist.

Stations used: 113

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 44 in the 60 days after this one and 23 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 ak021d089idi (also filed as us6000fthz). Read Fri, Oct 2, 2026, 10:27 AM UTC.