Alaska earthquakes

M4.8 earthquake 193 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 193 km WSW of Adak, Alaska on Sat, Oct 3, 2020, 10:11 PM HADT (07:11 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M4.9 182 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.8 (mb), light
Local time: Sat, Oct 3, 2020, 10:11 PM HADT
UTC: 2020-10-04 07:11:44 UTC
Depth: 40.2 km (25.0 mi), shallow
Epicenter: 51.241° N, 179.238° 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 4.4 km horizontally, 5.5 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 134°
Stations used: 176

Nearby

Within 100 km, magnitude 1.8 and up: 98 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 98.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c5e0 (also filed as ak020crvmyl6). Read Sun, Sep 27, 2026, 3:51 PM UTC.