Alaska earthquakes

M2.5 earthquake 164 km SE of Old Harbor, Alaska

A magnitude 2.5 earthquake struck 164 km SE of Old Harbor, Alaska on Wed, Feb 21, 2018, 4:50 AM AKST (13:50 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.6 105 km SSE of Akhiok, 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: 2.5 (ml), micro
Local time: Wed, Feb 21, 2018, 4:50 AM AKST
UTC: 2018-02-21 13:50:51 UTC
Depth: 5.7 km (3.5 mi), shallow
Epicenter: 55.988° N, 151.795° 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 10.6 km horizontally, 9.5 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 274°, poorly surrounded by stations
Stations used: 31

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 37 in the 60 days after this one and 127 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000dbf1 (also filed as ak18576320, ak0182e7zihk). Read Mon, Sep 28, 2026, 8:38 AM UTC.