Alaska earthquakes

M3.7 earthquake 84 km SW of Atka, Alaska

A magnitude 3.7 earthquake struck 84 km SW of Atka, Alaska on Fri, Oct 2, 2020, 5:33 PM HADT (02:33 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.3 68 km SSE of Adak, 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: Fri, Oct 2, 2020, 5:33 PM HADT
UTC: 2020-10-03 02:33:43 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.584° N, 174.916° 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 III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 203°, poorly surrounded by stations
Stations used: 32

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 73 in the 30 days before it.

After

The first 60 of 107.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c532 (also filed as ak020cq595vr). Read Mon, Sep 28, 2026, 12:05 AM UTC.