Alaska earthquakes

M3.5 earthquake 130 km WSW of Nikolski, Alaska

A magnitude 3.5 earthquake struck 130 km WSW of Nikolski, Alaska on Sat, Sep 26, 2020, 10:24 PM HADT (07:24 UTC), 49 km (31 mi) below the surface.

A larger quake followed: M5.2 120 km SSW of Nikolski, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.5 (ml), minor
Local time: Sat, Sep 26, 2020, 10:24 PM HADT
UTC: 2020-09-27 07:24:57 UTC
Depth: 49.4 km (30.7 mi), shallow
Epicenter: 52.422° N, 170.591° 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 9.2 km horizontally, 9.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 175°
Stations used: 44

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 17 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 us6000c40a (also filed as ak020cgaycqn). Read Tue, Sep 29, 2026, 3:01 PM UTC.