Alaska earthquakes

M3.6 earthquake 196 km SW of Nikolski, Alaska

A magnitude 3.6 earthquake struck 196 km SW of Nikolski, Alaska on Mon, Aug 17, 2020, 2:20 AM HADT (11:20 UTC), 23 km (15 mi) below the surface.

A larger quake followed: M4.4 126 km SSW of Nikolski, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.6 (mb), minor
Local time: Mon, Aug 17, 2020, 2:20 AM HADT
UTC: 2020-08-17 11:20:12 UTC
Depth: 23.4 km (14.5 mi), shallow
Epicenter: 51.863° N, 171.159° 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 6.6 km horizontally, 6.4 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 166°
Stations used: 106

Nearby

Within 100 km, magnitude 1.5 and up: 22 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 us6000bify (also filed as ak020akk9wj3). Read Tue, Sep 29, 2026, 6:14 PM UTC.