Alaska earthquakes

M4.8 earthquake 241 km ESE of Chiniak, Alaska

A magnitude 4.8 earthquake struck 241 km ESE of Chiniak, Alaska on Mon, Feb 5, 2018, 10:22 AM AKST (19:22 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: 4.8 (mb), light
Local time: Mon, Feb 5, 2018, 10:22 AM AKST
UTC: 2018-02-05 19:22:29 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.510° N, 148.844° 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 6.5 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.04
Depth from: Operator assigned
Station coverage gap: 141°
Stations used: 111

Nearest places

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

Nearby

Within 100 km, magnitude 1.8 and up: at least 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000cg7h (also filed as ak18354671, ak0181nusikw, iscgem611835911). Read Mon, Sep 28, 2026, 6:23 PM UTC.