Alaska earthquakes

M4.3 earthquake 214 km ESE of Atka, Alaska

A magnitude 4.3 earthquake struck 214 km ESE of Atka, Alaska on Sat, Aug 15, 2020, 7:47 AM HADT (16:47 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.8 241 km ESE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.3 (mb), light
Local time: Sat, Aug 15, 2020, 7:47 AM HADT
UTC: 2020-08-15 16:47:55 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.579° N, 171.254° 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 5.2 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.04
Depth from: Operator assigned
Station coverage gap: 90°
Stations used: 90

Nearby

Within 100 km, magnitude 1.5 and up: 27 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 us6000bf8k (also filed as ak020ahcc9ih). Read Tue, Sep 29, 2026, 10:08 PM UTC.