Alaska earthquakes

M3.7 earthquake 254 km SE of Chiniak, Alaska

A magnitude 3.7 earthquake struck 254 km SE of Chiniak, Alaska on Thu, Mar 22, 2018, 12:33 AM AKDT (08:33 UTC), 22 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: 3.7 (mb), minor
Local time: Thu, Mar 22, 2018, 12:33 AM AKDT
UTC: 2018-03-22 08:33:07 UTC
Depth: 21.5 km (13.4 mi), shallow
Epicenter: 56.335° N, 148.806° W
Region: Alaska
Felt reports: 2
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

2 people 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 6.8 km horizontally, 8.6 km in depth
Magnitude uncertainty: ±0.29
Depth from: From location
Station coverage gap: 162°
Stations used: 97

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 us1000d7fd (also filed as ak0183q3hoev, ak18726485). Read Fri, Sep 25, 2026, 8:25 PM UTC.