Alaska earthquakes

M3.4 earthquake 273 km SE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 273 km SE of Chiniak, Alaska on Fri, Feb 9, 2018, 8:21 PM AKST (05:21 UTC), 20 km (13 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: 3.4 (ml), minor
Local time: Fri, Feb 9, 2018, 8:21 PM AKST
UTC: 2018-02-10 05:21:50 UTC
Depth: 20.3 km (12.6 mi), shallow
Epicenter: 56.190° N, 148.620° 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 9.9 km horizontally, 11.1 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 224°, poorly surrounded by stations
Stations used: 84

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 us2000d04d (also filed as ak18419424, ak0181vw50ee). Read Mon, Sep 28, 2026, 4:03 PM UTC.