Alaska earthquakes

M3.3 earthquake 35 km E of Adak, Alaska

A magnitude 3.3 earthquake struck 35 km E of Adak, Alaska on Fri, Oct 9, 2020, 12:44 AM HADT (09:44 UTC), 89 km (56 mi) below the surface.

A larger quake followed: M4.3 68 km SSE of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.3 (mb), minor
Local time: Fri, Oct 9, 2020, 12:44 AM HADT
UTC: 2020-10-09 09:44:24 UTC
Depth: 89.5 km (55.6 mi), intermediate-depth
Epicenter: 51.871° N, 176.117° 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 6.9 km horizontally, 4.3 km in depth
Magnitude uncertainty: ±0.20
Depth from: From location
Station coverage gap: 115°
Stations used: 38

Nearby

Within 100 km, magnitude 1.5 and up: 123 in the 60 days after this one and 85 in the 30 days before it.

After

The first 60 of 123.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c8cl (also filed as ak020d06pllp). Read Sun, Sep 27, 2026, 7:16 PM UTC.