Alaska earthquakes

M4.2 earthquake 232 km SSE of Chiniak, Alaska

A magnitude 4.2 earthquake struck 232 km SSE of Chiniak, Alaska on Mon, Feb 12, 2018, 2:47 PM AKST (23:47 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M5.2 228 km SE 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: 4.2 (mb), light
Local time: Mon, Feb 12, 2018, 2:47 PM AKST
UTC: 2018-02-12 23:47:17 UTC
Depth: 7.1 km (4.4 mi), shallow
Epicenter: 55.877° N, 150.173° 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 6.6 km horizontally, 5.9 km in depth
Magnitude uncertainty: ±0.53
Depth from: From location
Station coverage gap: 184°, poorly surrounded by stations
Stations used: 106

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

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000d17r (also filed as ak18434939, ak0181zi30l8). Read Mon, Sep 28, 2026, 4:11 PM UTC.