Alaska earthquakes

M4.0 earthquake 72 km NE of Adak, Alaska

A magnitude 4.0 earthquake struck 72 km NE of Adak, Alaska on Mon, Aug 24, 2020, 6:07 PM HADT (03:07 UTC), 153 km (95 mi) below the surface.

A larger quake followed: M5.3 76 km SW 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: 4.0 (mb), light
Local time: Mon, Aug 24, 2020, 6:07 PM HADT
UTC: 2020-08-25 03:07:36 UTC
Depth: 152.6 km (94.8 mi), intermediate-depth
Epicenter: 52.289° N, 175.815° 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 7.2 km horizontally, 5.8 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 98°
Stations used: 164

Nearby

Within 100 km, magnitude 1.5 and up: 103 in the 60 days after this one and 63 in the 30 days before it.

After

The first 60 of 103.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000bcek (also filed as ak020axnqh64). Read Mon, Sep 28, 2026, 10:35 PM UTC.