Alaska earthquakes

M3.7 earthquake 25 km WNW of Adak, Alaska

A magnitude 3.7 earthquake struck 25 km WNW of Adak, Alaska on Mon, Feb 24, 2020, 12:52 PM HAST (22:52 UTC), 103 km (64 mi) below the surface.

A larger quake followed: M5.0 71 km WNW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.7 (mb), minor
Local time: Mon, Feb 24, 2020, 12:52 PM HAST
UTC: 2020-02-24 22:52:33 UTC
Depth: 103.0 km (64.0 mi), intermediate-depth
Epicenter: 51.983° N, 176.962° 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 8.4 km horizontally, 3.9 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 73°
Stations used: 105

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and at least 200 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 us60008684 (also filed as ak0202jbyua3). Read Wed, Sep 30, 2026, 7:52 AM UTC.