Alaska earthquakes

M4.3 earthquake 245 km ESE of Chiniak, Alaska

A magnitude 4.3 earthquake struck 245 km ESE of Chiniak, Alaska on Mon, Feb 26, 2018, 9:18 AM AKST (18:18 UTC), 10 km (6 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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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.3 (mb), light
Local time: Mon, Feb 26, 2018, 9:18 AM AKST
UTC: 2018-02-26 18:18:53 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.536° N, 148.740° 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 8.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.27
Depth from: Operator assigned
Station coverage gap: 168°
Stations used: 65

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 us2000ddka (also filed as ak18607785, ak0182mkgke0). Read Sun, Sep 27, 2026, 6:42 PM UTC.