Alaska earthquakes

M3.4 earthquake 257 km SE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 257 km SE of Chiniak, Alaska on Mon, Apr 9, 2018, 10:54 AM AKDT (18:54 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 276 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: 3.4 (ml), minor
Local time: Mon, Apr 9, 2018, 10:54 AM AKDT
UTC: 2018-04-09 18:54:28 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 56.320° N, 148.765° 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 7.8 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 190°, poorly surrounded by stations
Stations used: 87

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 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 us2000e04z (also filed as ak19161541, ak0184k18t0v). Read Fri, Sep 25, 2026, 4:37 PM UTC.