Alaska earthquakes

M2.7 earthquake 176 km SSE of Atka, Alaska

A magnitude 2.7 earthquake struck 176 km SSE of Atka, Alaska on Wed, Sep 16, 2020, 9:03 AM HADT (18:03 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.1 180 km SSE of Atka, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 2.7 (ml), micro
Local time: Wed, Sep 16, 2020, 9:03 AM HADT
UTC: 2020-09-16 18:03:18 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.705° N, 173.339° 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 7.8 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 253°, poorly surrounded by stations
Stations used: 17

Nearby

Within 100 km, magnitude 1.5 and up: 21 in the 60 days after this one and 7 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 us6000c1gs (also filed as ak020byagq7x). Read Tue, Sep 29, 2026, 7:21 PM UTC.