Alaska earthquakes

M3.4 earthquake 231 km SSE of Chiniak, Alaska

A magnitude 3.4 earthquake struck 231 km SSE of Chiniak, Alaska on Mon, Apr 2, 2018, 2:40 PM AKDT (22:40 UTC), 10 km (6 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: 3.4 (ml), minor
Local time: Mon, Apr 2, 2018, 2:40 PM AKDT
UTC: 2018-04-02 22:40:43 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 55.890° N, 150.145° 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 6.9 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 189°, poorly surrounded by stations
Stations used: 135

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 200 in the 60 days after this one and at least 199 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000dcs2 (also filed as ak18913013, ak01848is534). Read Fri, Sep 25, 2026, 3:21 PM UTC.