Alaska earthquakes

M3.6 earthquake 295 km SE of Chiniak, Alaska

A magnitude 3.6 earthquake struck 295 km SE of Chiniak, Alaska on Mon, Aug 20, 2018, 5:47 AM AKDT (13:47 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.9 250 km SE of Chiniak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.6 (ml), minor
Local time: Mon, Aug 20, 2018, 5:47 AM AKDT
UTC: 2018-08-20 13:47:05 UTC
Depth: 6.9 km (4.3 mi), shallow
Epicenter: 55.545° N, 149.257° 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 10.4 km horizontally, 8.6 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 216°, poorly surrounded by stations
Stations used: 35

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000gdx2 (also filed as ak20123657, aacse018anwp8yb, ak018anwp8yb). Read Tue, Sep 22, 2026, 2:45 PM UTC.