Alaska earthquakes

M3.8 earthquake 258 km SE of Chiniak, Alaska

A magnitude 3.8 earthquake struck 258 km SE of Chiniak, Alaska on Wed, Aug 8, 2018, 11:06 PM AKDT (07:06 UTC), 21 km (13 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: 3.8 (ml), minor
Local time: Wed, Aug 8, 2018, 11:06 PM AKDT
UTC: 2018-08-09 07:06:35 UTC
Depth: 21.0 km (13.1 mi), shallow
Epicenter: 56.256° N, 148.841° 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 7.7 km horizontally, 9.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 203°, poorly surrounded by stations
Stations used: 150

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 us1000g5nq (also filed as ak018a5lz3nz, ak20036124, aacse018a5lz3nz). Read Wed, Sep 30, 2026, 9:31 AM UTC.