Alaska earthquakes

M3.3 earthquake 257 km ESE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 257 km ESE of Chiniak, Alaska on Tue, Apr 10, 2018, 2:36 PM AKDT (22:36 UTC), 23 km (15 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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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Tue, Apr 10, 2018, 2:36 PM AKDT
UTC: 2018-04-10 22:36:39 UTC
Depth: 23.5 km (14.6 mi), shallow
Epicenter: 56.442° N, 148.632° 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 7.7 km horizontally, 10.4 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 198°, poorly surrounded by stations
Stations used: 72

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 us2000e01q (also filed as ak19226464, ak0184lr21te). Read Fri, Sep 25, 2026, 9:01 PM UTC.