Alaska earthquakes

M3.3 earthquake 179 km SSE of Adak, Alaska

A magnitude 3.3 earthquake struck 179 km SSE of Adak, Alaska on Thu, Oct 8, 2020, 12:50 PM HADT (21:50 UTC), 30 km (18 mi) below the surface.

A larger quake followed: M4.0 97 km S of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Thu, Oct 8, 2020, 12:50 PM HADT
UTC: 2020-10-08 21:50:08 UTC
Depth: 29.8 km (18.5 mi), shallow
Epicenter: 50.309° N, 176.017° 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 8.9 km horizontally, 15.2 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 261°, poorly surrounded by stations
Stations used: 24

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 0 in the 30 days before it.

After

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c8nr (also filed as ak020cyqcprf). Read Tue, Sep 29, 2026, 3:17 AM UTC.