Alaska earthquakes

M4.3 earthquake 39 km SSW of Adak, Alaska

A magnitude 4.3 earthquake struck 39 km SSW of Adak, Alaska on Tue, Nov 3, 2020, 11:35 PM HAST (09:35 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 124 km SW 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: 4.3 (mb), light
Local time: Tue, Nov 3, 2020, 11:35 PM HAST
UTC: 2020-11-04 09:35:46 UTC
Depth: 33.4 km (20.8 mi), shallow
Epicenter: 51.543° N, 176.830° 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 IV, light shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.3 km horizontally, 6.5 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 183°, poorly surrounded by stations
Stations used: 92

Nearby

Within 100 km, magnitude 1.5 and up: 150 in the 60 days after this one and 56 in the 30 days before it.

After

The first 60 of 150.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000ca9e (also filed as ak020e76mqkp). Read Mon, Sep 28, 2026, 4:01 AM UTC.