Alaska earthquakes

M2.9 earthquake 238 km SE of Chiniak, Alaska

A magnitude 2.9 earthquake struck 238 km SE of Chiniak, Alaska on Sat, Aug 11, 2018, 7:28 PM AKDT (03:28 UTC), 10 km (6 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: 2.9 (ml), micro
Local time: Sat, Aug 11, 2018, 7:28 PM AKDT
UTC: 2018-08-12 03:28:54 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.269° N, 149.222° 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 7.9 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 221°, poorly surrounded by stations
Stations used: 31

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 us1000gc8r (also filed as ak018aaic97v, ak20111006, aacse018aaic97v). Read Tue, Sep 29, 2026, 3:07 PM UTC.