Alaska earthquakes

M2.8 earthquake 226 km WSW of Adak, Alaska

A magnitude 2.8 earthquake struck 226 km WSW of Adak, Alaska on Tue, Aug 18, 2020, 6:49 PM HADT (03:49 UTC), 67 km (41 mi) below the surface.

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

Map

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The earthquake

Magnitude: 2.8 (ml), micro
Local time: Tue, Aug 18, 2020, 6:49 PM HADT
UTC: 2020-08-19 03:49:43 UTC
Depth: 66.5 km (41.4 mi), shallow
Epicenter: 51.515° N, 179.851° 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 6.7 km horizontally, 10.5 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 170°
Stations used: 30

Nearby

Within 100 km, magnitude 1.5 and up: 151 in the 60 days after this one and 63 in the 30 days before it.

After

The first 60 of 151.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000be4f (also filed as ak020anqrevk). Read Mon, Sep 28, 2026, 11:52 PM UTC.