Alaska earthquakes

M2.8 earthquake 258 km ESE of Chiniak, Alaska

A magnitude 2.8 earthquake struck 258 km ESE of Chiniak, Alaska on Thu, Feb 22, 2018, 1:57 AM AKST (10:57 UTC), 21 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: 2.8 (ml), micro
Local time: Thu, Feb 22, 2018, 1:57 AM AKST
UTC: 2018-02-22 10:57:08 UTC
Depth: 21.5 km (13.3 mi), shallow
Epicenter: 56.453° N, 148.600° 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 5.8 km horizontally, 11.2 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 247°, poorly surrounded by stations
Stations used: 33

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 us2000d9wz (also filed as ak18573354, ak0182ftrz1a). Read Mon, Sep 28, 2026, 8:40 AM UTC.