Alaska earthquakes

M2.5 earthquake 284 km SE of Chiniak, Alaska

A magnitude 2.5 earthquake struck 284 km SE of Chiniak, Alaska on Sun, Aug 20, 2023, 11:56 PM AKDT (07:56 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.5 278 km SE of Chiniak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.5 (ml), micro
Local time: Sun, Aug 20, 2023, 11:56 PM AKDT
UTC: 2023-08-21 07:56:52 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 55.544° N, 149.558° 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 12.3 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.12
Depth from: Operator assigned
Station coverage gap: 285°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 10 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 us7000kssr (also filed as ak023apgq0k2). Read Mon, Sep 28, 2026, 1:24 AM UTC.