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.

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The earthquake

Magnitude
2.8 (ml), micro
Local time
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 todayAlaska earthquakesLive 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.