Alaska earthquakes

M2.8 earthquake 18 km ENE of Adak, Alaska

A magnitude 2.8 earthquake struck 18 km ENE of Adak, Alaska on Mon, Aug 3, 2020, 4:41 AM HADT (13:41 UTC), 106 km (66 mi) below the surface.

A larger quake followed: M4.0 72 km NE of Adak, 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: 2.8 (ml), micro
Local time: Mon, Aug 3, 2020, 4:41 AM HADT
UTC: 2020-08-03 13:41:08 UTC
Depth: 106.0 km (65.9 mi), intermediate-depth
Epicenter: 51.910° N, 176.373° 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 10.6 km horizontally, 5.4 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 127°
Stations used: 20

Nearby

Within 100 km, magnitude 1.5 and up: 159 in the 60 days after this one and 103 in the 30 days before it.

After

The first 60 of 159.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000bi8d (also filed as ak0209xg2eky). Read Tue, Sep 29, 2026, 3:13 AM UTC.