Alaska earthquakes

M3.5 earthquake 71 km E of Atka, Alaska

A magnitude 3.5 earthquake struck 71 km E of Atka, Alaska on Sat, Feb 22, 2020, 10:30 PM HAST (08:30 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.2 53 km NNW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
3.5 (mb), minor
Local time
UTC
2020-02-23 08:30:27 UTC
Depth
9.8 km (6.1 mi), shallow
Epicenter
52.166° N, 173.153° 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 3.7 km horizontally, 7.6 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
191°, poorly surrounded by stations
Stations used
59

Nearby

Within 100 km, magnitude 1.5 and up: 33 in the 60 days after this one and 18 in the 30 days before it.

After

Before

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60008fvj (also filed as ak0202hfyppb). Read Wed, Sep 30, 2026, 4:13 PM UTC.