Alaska earthquakes

M3.5 earthquake 141 km SE of Atka, Alaska

A magnitude 3.5 earthquake struck 141 km SE of Atka, Alaska on Wed, Jun 24, 2020, 4:50 AM HADT (13:50 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.5 184 km E of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.5 (mb), minor
Local time: Wed, Jun 24, 2020, 4:50 AM HADT
UTC: 2020-06-24 13:50:22 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.426° N, 172.564° 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 6.9 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 194°, poorly surrounded by stations
Stations used: 57

Nearby

Within 100 km, magnitude 1.5 and up: 55 in the 60 days after this one and 19 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 us7000acz3 (also filed as ak02083amgsu). Read Wed, Sep 30, 2026, 4:11 PM UTC.