Alaska earthquakes

M5.3 earthquake 76 km SW of Atka, Alaska

A magnitude 5.3 earthquake struck 76 km SW of Atka, Alaska on Thu, Oct 1, 2020, 1:25 AM HADT (10:25 UTC), 40 km (25 mi) below the surface.

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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: 5.3 (mww), moderate
Local time: Thu, Oct 1, 2020, 1:25 AM HADT
UTC: 2020-10-01 10:25:07 UTC
Depth: 40.2 km (25.0 mi), shallow
Epicenter: 51.667° N, 174.917° 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 III, weak shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Reverse (thrust)
Moment magnitude: 5.3 Mww
Nodal plane 1: Strike 265°, dip 31°, rake 112°
Nodal plane 2: Strike 59°, dip 61°, rake 77°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.9 km horizontally, 4.4 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 38°
Stations used: 147

Nearby

Within 100 km, magnitude 2.3 and up: 51 in the 60 days after this one and 23 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c3t7 (also filed as pt20275001, ak020cmyw5da, iscgem619404995). Read Mon, Sep 28, 2026, 2:32 AM UTC.