Alaska earthquakes

M3.3 earthquake 263 km SE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 263 km SE of Chiniak, Alaska on Wed, Oct 24, 2018, 6:56 AM AKDT (14:56 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M4.8 218 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: 3.3 (ml), minor
Local time: Wed, Oct 24, 2018, 6:56 AM AKDT
UTC: 2018-10-24 14:56:52 UTC
Depth: 20.3 km (12.6 mi), shallow
Epicenter: 56.224° N, 148.777° 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 4.6 km horizontally, 9.7 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 198°, poorly surrounded by stations
Stations used: 134

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000i4zf (also filed as ak018dnfa9hd, ak20289789, aacse018dnfa9hd). Read Tue, Sep 22, 2026, 6:49 PM UTC.