Alaska earthquakes

M3.1 earthquake 169 km S of Nikolski, Alaska

A magnitude 3.1 earthquake struck 169 km S of Nikolski, Alaska on Thu, Jul 30, 2020, 11:10 PM AKDT (07:10 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 129 km SSW of Nikolski, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Thu, Jul 30, 2020, 11:10 PM AKDT
UTC: 2020-07-31 07:10:38 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.422° N, 168.665° 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 6.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 220°, poorly surrounded by stations
Stations used: 38

Nearby

Within 100 km, magnitude 1.5 and up: 37 in the 60 days after this one and 6 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 us6000be4s (also filed as ak0209sdp6r9). Read Wed, Sep 30, 2026, 6:48 AM UTC.