Alaska earthquakes

M3.9 earthquake 263 km ESE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 263 km ESE of Chiniak, Alaska on Fri, May 4, 2018, 3:05 AM AKDT (11:05 UTC), 21 km (13 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: 3.9 (mb), minor
Local time: Fri, May 4, 2018, 3:05 AM AKDT
UTC: 2018-05-04 11:05:13 UTC
Depth: 20.8 km (12.9 mi), shallow
Epicenter: 56.413° N, 148.532° 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 7.6 km horizontally, 9.0 km in depth
Magnitude uncertainty: ±0.36
Depth from: From location
Station coverage gap: 187°, poorly surrounded by stations
Stations used: 196

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 us1000dxtu (also filed as ak0185p97wq5, ak19310816). Read Sat, Sep 26, 2026, 11:18 PM UTC.