Alaska earthquakes

M4.0 earthquake 248 km SE of Chiniak, Alaska

A magnitude 4.0 earthquake struck 248 km SE of Chiniak, Alaska on Tue, Sep 18, 2018, 4:40 PM AKDT (00:40 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M4.8 218 km SE of Chiniak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 4.0 (ml), light
Local time: Tue, Sep 18, 2018, 4:40 PM AKDT
UTC: 2018-09-19 00:40:52 UTC
Depth: 21.9 km (13.6 mi), shallow
Epicenter: 56.163° N, 149.170° 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 7.3 km horizontally, 9.7 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 174°
Stations used: 125

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 us2000hgxn (also filed as ak018c1b1mdx, ak20258267, aacse018c1b1mdx). Read Sun, Sep 27, 2026, 6:18 AM UTC.