Alaska earthquakes

M3.0 earthquake 66 km N of Chickaloon, Alaska

A magnitude 3.0 earthquake struck 66 km N of Chickaloon, Alaska on Sun, Sep 20, 2020, 8:43 AM AKDT (16:43 UTC), 29 km (18 mi) below the surface.

A larger quake followed: M3.2 45 km S of Cantwell, Alaska. This one was a foreshock.

Sutton-Alpine forecast More in Alaska

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, Sep 20, 2020, 8:43 AM AKDT
UTC: 2020-09-20 16:43:18 UTC
Depth: 29.2 km (18.1 mi), shallow
Epicenter: 62.392° N, 148.339° W
Region: Alaska
Felt reports: 2
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 · ±0.025 · 218 stations

Did you feel it?

2 people 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: 185

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 60 in the 30 days before it.

After

The first 60 of 113.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak020c4vnt82 (also filed as us7000bqig). Read Thu, Oct 1, 2026, 10:57 AM UTC.