Alaska earthquakes

M3.5 earthquake 231 km SE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 231 km SE of Chiniak, Alaska on Thu, Aug 9, 2018, 4:09 AM AKDT (12:09 UTC), 19 km (12 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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Map

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

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The earthquake

Magnitude: 3.5 (ml), minor
Local time: Thu, Aug 9, 2018, 4:09 AM AKDT
UTC: 2018-08-09 12:09:55 UTC
Depth: 19.4 km (12.1 mi), shallow
Epicenter: 56.212° N, 149.462° 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 5.2 km horizontally, 9.3 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 204°, poorly surrounded by stations
Stations used: 57

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000g5ra (also filed as ak20038628, aacse018a5oyydo, ak018a5oyydo). Read Mon, Sep 28, 2026, 7:21 AM UTC.