Alaska earthquakes

M3.5 earthquake 256 km ESE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 256 km ESE of Chiniak, Alaska on Tue, Apr 3, 2018, 6:04 PM AKDT (02:04 UTC), 23 km (14 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: 3.5 (mb), minor
Local time: Tue, Apr 3, 2018, 6:04 PM AKDT
UTC: 2018-04-04 02:04:13 UTC
Depth: 22.6 km (14.0 mi), shallow
Epicenter: 56.477° N, 148.605° 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 6.9 km horizontally, 9.0 km in depth
Magnitude uncertainty: ±0.50
Depth from: From location
Station coverage gap: 170°
Stations used: 161

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 200 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 200.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000ddz4 (also filed as ak18943722, ak0184bhqdtk). Read Sat, Sep 26, 2026, 10:17 PM UTC.