Alaska earthquakes

M3.8 earthquake 263 km SE of Chiniak, Alaska

A magnitude 3.8 earthquake struck 263 km SE of Chiniak, Alaska on Sat, Mar 31, 2018, 8:38 PM AKDT (04:38 UTC), 8 km (5 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: 3.8 (mb), minor
Local time: Sat, Mar 31, 2018, 8:38 PM AKDT
UTC: 2018-04-01 04:38:53 UTC
Depth: 7.7 km (4.8 mi), shallow
Epicenter: 55.931° N, 149.250° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.0 km horizontally, 6.6 km in depth
Magnitude uncertainty: ±0.29
Depth from: From location
Station coverage gap: 152°
Stations used: 247

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 us1000dc1h (also filed as ak01846kil2t, ak18876372). Read Sun, Sep 27, 2026, 1:27 AM UTC.