Alaska earthquakes

M3.7 earthquake 206 km SE of Chiniak, Alaska

A magnitude 3.7 earthquake struck 206 km SE of Chiniak, Alaska on Thu, Feb 22, 2018, 12:59 AM AKST (09:59 UTC), 31 km (20 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: 3.7 (ml), minor
Local time: Thu, Feb 22, 2018, 12:59 AM AKST
UTC: 2018-02-22 09:59:15 UTC
Depth: 31.4 km (19.5 mi), shallow
Epicenter: 56.177° N, 150.134° 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 8.4 km horizontally, 12.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 188°, poorly surrounded by stations
Stations used: 69

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 us2000d6bf (also filed as ak18487473, ak0182ft6zc0). Read Mon, Sep 28, 2026, 9:51 AM UTC.