Alaska earthquakes

M3.1 earthquake 229 km SE of Chiniak, Alaska

A magnitude 3.1 earthquake struck 229 km SE of Chiniak, Alaska on Sun, Sep 30, 2018, 7:19 AM AKDT (15:19 UTC), 10 km (6 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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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: Sun, Sep 30, 2018, 7:19 AM AKDT
UTC: 2018-09-30 15:19:08 UTC
Depth: 9.7 km (6.0 mi), shallow
Epicenter: 55.982° N, 149.971° 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 9.8 km horizontally, 8.8 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 230°, poorly surrounded by stations
Stations used: 40

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 199 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 199.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000h9jg (also filed as ak20267600, ak018cjqrche, aacse018cjqrche). Read Tue, Sep 29, 2026, 5:56 PM UTC.