Alaska earthquakes

M3.3 earthquake 235 km SE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 235 km SE of Chiniak, Alaska on Wed, Aug 1, 2018, 10:21 PM AKDT (06:21 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M4.9 250 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, Aug 1, 2018, 10:21 PM AKDT
UTC: 2018-08-02 06:21:39 UTC
Depth: 20.4 km (12.6 mi), shallow
Epicenter: 56.002° N, 149.768° 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 3.1 km horizontally, 9.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 187°, poorly surrounded by stations
Stations used: 101

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 193 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 us1000g1m5 (also filed as ak0189u0pgrm, ak20003473, aacse0189u0pgrm). Read Tue, Sep 29, 2026, 12:24 AM UTC.