Alaska earthquakes

M4.2 earthquake 236 km SE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 236 km SE of Chiniak, Alaska on Sat, Feb 3, 2018, 12:13 AM AKST (09:13 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M5.4 252 km ESE 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: 4.2 (mb), light
Local time: Sat, Feb 3, 2018, 12:13 AM AKST
UTC: 2018-02-03 09:13:37 UTC
Depth: 17.6 km (10.9 mi), shallow
Epicenter: 55.994° N, 149.783° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.8 km horizontally, 6.9 km in depth
Magnitude uncertainty: ±0.24
Depth from: From location
Station coverage gap: 149°
Stations used: 164

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

After

The first 60 of at least 202.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000cf98 (also filed as ak18305941, ak0181kdpknx). Read Tue, Sep 29, 2026, 2:17 PM UTC.