Alaska earthquakes

M3.6 earthquake 18 km SSE of Nelson Lagoon, Alaska

A magnitude 3.6 earthquake struck 18 km SSE of Nelson Lagoon, Alaska on Thu, Apr 23, 2020, 9:58 AM AKDT (17:58 UTC), 165 km (103 mi) below the surface.

A larger quake followed: M4.5 55 km SW of Nelson Lagoon, Alaska. This one was a foreshock.

Sand Point forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.6 (mb), minor
Local time: Thu, Apr 23, 2020, 9:58 AM AKDT
UTC: 2020-04-23 17:58:47 UTC
Depth: 165.3 km (102.7 mi), intermediate-depth
Epicenter: 55.849° N, 161.082° 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 6.1 km horizontally, 6.3 km in depth
Magnitude uncertainty: ±0.22
Depth from: From location
Station coverage gap: 111°
Stations used: 51

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Sand Point, AlaskaPopulation 1,064. Forecast68 kmNNW

Nearby

Within 100 km, magnitude 1.5 and up: 24 in the 60 days after this one and 11 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 us60009epe (also filed as ak02058tqh29). Read Wed, Sep 30, 2026, 3:10 AM UTC.