Alaska earthquakes

M3.3 earthquake 268 km SE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 268 km SE of Chiniak, Alaska on Fri, Feb 23, 2018, 2:32 PM AKST (23:32 UTC), 24 km (15 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: 3.3 (ml), minor
Local time: Fri, Feb 23, 2018, 2:32 PM AKST
UTC: 2018-02-23 23:32:44 UTC
Depth: 23.7 km (14.7 mi), shallow
Epicenter: 56.297° N, 148.576° 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 9.6 km horizontally, 11.1 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 236°, 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 us2000dbht (also filed as ak18576700, ak0182howo6n). Read Mon, Sep 28, 2026, 2:19 AM UTC.