Alaska earthquakes

M2.9 earthquake 21 km S of Atka, Alaska

A magnitude 2.9 earthquake struck 21 km S of Atka, Alaska on Sat, Oct 17, 2020, 4:03 PM HADT (01:03 UTC), 195 km (121 mi) below the surface.

A larger quake followed: M4.5 62 km N of Atka, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 2.9 (ml), micro
Local time: Sat, Oct 17, 2020, 4:03 PM HADT
UTC: 2020-10-18 01:03:11 UTC
Depth: 194.5 km (120.9 mi), intermediate-depth
Epicenter: 52.007° N, 174.170° 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 14.2 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 198°, poorly surrounded by stations
Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: 63 in the 60 days after this one and 53 in the 30 days before it.

After

The first 60 of 63.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000c849 (also filed as ak020dexjfvo). Read Mon, Sep 28, 2026, 12:48 AM UTC.