Alaska earthquakes

M3.4 earthquake 139 km E of Atka, Alaska

A magnitude 3.4 earthquake struck 139 km E of Atka, Alaska on Mon, Jun 22, 2020, 3:40 AM HADT (12:40 UTC), 77 km (48 mi) below the surface.

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

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The earthquake

Magnitude: 3.4 (mb), minor
Local time: Mon, Jun 22, 2020, 3:40 AM HADT
UTC: 2020-06-22 12:40:04 UTC
Depth: 76.6 km (47.6 mi), intermediate-depth
Epicenter: 52.307° N, 172.166° 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 10.6 km horizontally, 10.3 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 175°
Stations used: 52

Nearby

Within 100 km, magnitude 1.5 and up: 54 in the 60 days after this one and 13 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 us6000agp5 (also filed as ak0207zyw74h). Read Wed, Sep 30, 2026, 11:25 PM UTC.