Alaska earthquakes

M3.3 earthquake 257 km ESE of Chiniak, Alaska

A magnitude 3.3 earthquake struck 257 km ESE of Chiniak, Alaska on Sat, May 5, 2018, 1:01 AM AKDT (09:01 UTC), 20 km (12 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: Sat, May 5, 2018, 1:01 AM AKDT
UTC: 2018-05-05 09:01:12 UTC
Depth: 20.1 km (12.5 mi), shallow
Epicenter: 56.442° N, 148.622° 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 9.3 km horizontally, 10.7 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 217°, poorly surrounded by stations
Stations used: 49

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 us1000e07k (also filed as ak19355775, ak0185qvjizw). Read Sun, Sep 27, 2026, 12:23 AM UTC.