Alaska earthquakes

M2.5 earthquake 38 km SW of Adak, Alaska

A magnitude 2.5 earthquake struck 38 km SW of Adak, Alaska on Thu, Apr 16, 2020, 6:09 PM HADT (03:09 UTC), 69 km (43 mi) below the surface.

A larger quake followed: M3.9 64 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.5 (ml), micro
Local time: Thu, Apr 16, 2020, 6:09 PM HADT
UTC: 2020-04-17 03:09:16 UTC
Depth: 68.5 km (42.6 mi), shallow
Epicenter: 51.634° N, 177.030° 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 8.1 km horizontally, 6.2 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 206°, poorly surrounded by stations
Stations used: 25

Nearby

Within 100 km, magnitude 1.5 and up: at least 200 in the 60 days after this one and 108 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60009bg5 (also filed as ak0204ynvqvi). Read Wed, Sep 30, 2026, 12:52 AM UTC.