Alaska earthquakes

M2.8 earthquake 51 km SSE of Adak, Alaska

A magnitude 2.8 earthquake struck 51 km SSE of Adak, Alaska on Mon, Apr 27, 2020, 1:25 AM HADT (10:25 UTC), 41 km (25 mi) below the surface.

A larger quake followed: M4.5 146 km SSE of Adak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 2.8 (ml), micro
Local time: Mon, Apr 27, 2020, 1:25 AM HADT
UTC: 2020-04-27 10:25:02 UTC
Depth: 40.9 km (25.4 mi), shallow
Epicenter: 51.439° N, 176.396° 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 4.8 km horizontally, 22.5 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 206°, poorly surrounded by stations
Stations used: 33

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 83 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70009is6 (also filed as ak0205fbingz). Read Tue, Sep 29, 2026, 9:29 PM UTC.