Alaska earthquakes

M3.5 earthquake 270 km ESE of Chiniak, Alaska

A magnitude 3.5 earthquake struck 270 km ESE of Chiniak, Alaska on Fri, Mar 2, 2018, 7:01 AM AKST (16:01 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M5.4 252 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 (ml), minor
Local time: Fri, Mar 2, 2018, 7:01 AM AKST
UTC: 2018-03-02 16:01:18 UTC
Depth: 20.1 km (12.5 mi), shallow
Epicenter: 56.359° N, 148.463° 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 7.7 km horizontally, 10.3 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 195°, poorly surrounded by stations
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 202 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 202.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000db3n (also filed as ak18575242, ak0182t5bd6f). Read Sun, Sep 27, 2026, 1:36 PM UTC.