Alaska earthquakes

M3.1 earthquake 254 km ESE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 254 km ESE of Chiniak, Alaska on Tue, Aug 28, 2018, 4:24 PM AKDT (00:24 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M4.0 248 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: 3.1 (ml), minor
Local time: Tue, Aug 28, 2018, 4:24 PM AKDT
UTC: 2018-08-29 00:24:07 UTC
Depth: 20.4 km (12.7 mi), shallow
Epicenter: 56.474° N, 148.637° 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, 9.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 235°, poorly surrounded by stations
Stations used: 39

Nearest places

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

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.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000h5yq (also filed as ak018b2knt2j, ak20269557, aacse018b2knt2j). Read Tue, Sep 22, 2026, 10:29 AM UTC.