Alaska earthquakes

M3.7 earthquake 240 km WSW of Adak, Alaska

A magnitude 3.7 earthquake struck 240 km WSW of Adak, Alaska on Thu, Sep 24, 2020, 7:58 AM GMT+12 (19:58 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M4.8 193 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.7 (ml), minor
Local time: Thu, Sep 24, 2020, 7:58 AM GMT+12
UTC: 2020-09-23 19:58:22 UTC
Depth: 19.1 km (11.8 mi), shallow
Epicenter: 51.468° N, 179.951° E
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 2.7 km horizontally, 5.7 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 175°
Stations used: 24

Nearby

Within 100 km, magnitude 1.5 and up: 101 in the 60 days after this one and 67 in the 30 days before it.

After

The first 60 of 101.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c4i5 (also filed as ak020c9w5dn7). Read Sun, Sep 27, 2026, 11:33 PM UTC.