Alaska earthquakes

M2.5 earthquake 178 km SE of Chiniak, Alaska

A magnitude 2.5 earthquake struck 178 km SE of Chiniak, Alaska on Mon, Sep 28, 2020, 8:56 PM AKDT (04:56 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M4.2 205 km SE of Chiniak, 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: 2.5 (ml), micro
Local time: Mon, Sep 28, 2020, 8:56 PM AKDT
UTC: 2020-09-29 04:56:11 UTC
Depth: 23.7 km (14.7 mi), shallow
Epicenter: 56.306° N, 150.577° 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 6.5 km horizontally, 11.2 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 276°, poorly surrounded by stations
Stations used: 21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 9 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c7tw (also filed as ak020cjkfi45). Read Sat, Sep 26, 2026, 4:35 AM UTC.