Alaska earthquakes

M3.7 earthquake 257 km SE of Chiniak, Alaska

A magnitude 3.7 earthquake struck 257 km SE of Chiniak, Alaska on Thu, Oct 15, 2020, 1:56 AM AKDT (09:56 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M4.8 Gulf of Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.7 (ml), minor
Local time: Thu, Oct 15, 2020, 1:56 AM AKDT
UTC: 2020-10-15 09:56:05 UTC
Depth: 19.1 km (11.8 mi), shallow
Epicenter: 56.271° N, 148.836° 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 8.6 km horizontally, 9.5 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 197°, poorly surrounded by stations
Stations used: 55

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 11 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c8hd (also filed as ak020da407lc). Read Fri, Sep 25, 2026, 10:51 PM UTC.