Alaska earthquakes

M3.6 earthquake 282 km SE of Chiniak, Alaska

A magnitude 3.6 earthquake struck 282 km SE of Chiniak, Alaska on Mon, Aug 23, 2021, 5:07 AM AKDT (13:07 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.0 247 km ESE of Chiniak, Alaska. This one was a foreshock.

Kodiak forecast More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 3.6 (mb), minor
Local time: Mon, Aug 23, 2021, 5:07 AM AKDT
UTC: 2021-08-23 13:07:44 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.114° N, 148.541° 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 8.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.50
Depth from: Operator assigned
Station coverage gap: 182°, poorly surrounded by stations
Stations used: 32

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 12 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 us6000fa0z (also filed as ak021asv2si5). Read Wed, Sep 23, 2026, 10:14 PM UTC.