Alaska earthquakes

M2.5 earthquake 68 km SW of Adak, Alaska

A magnitude 2.5 earthquake struck 68 km SW of Adak, Alaska on Sat, Oct 17, 2020, 6:21 PM HADT (03:21 UTC), 61 km (38 mi) below the surface.

A larger quake followed: M5.0 124 km SW 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: 2.5 (ml), micro
Local time: Sat, Oct 17, 2020, 6:21 PM HADT
UTC: 2020-10-18 03:21:47 UTC
Depth: 61.1 km (37.9 mi), shallow
Epicenter: 51.483° N, 177.407° 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 4.2 km horizontally, 9.3 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 199°, poorly surrounded by stations
Stations used: 24

Nearby

Within 100 km, magnitude 1.5 and up: 160 in the 60 days after this one and 94 in the 30 days before it.

After

The first 60 of 160.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000c844 (also filed as ak020deyu8pj). Read Sun, Sep 27, 2026, 10:36 PM UTC.