Alaska earthquakes

M4.3 earthquake 156 km WSW of Adak, Alaska

A magnitude 4.3 earthquake struck 156 km WSW of Adak, Alaska on Mon, Oct 26, 2020, 7:41 PM HADT (04:41 UTC), 35 km (22 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.

Open the live map with earthquakes

The earthquake

Magnitude: 4.3 (mb), light
Local time: Mon, Oct 26, 2020, 7:41 PM HADT
UTC: 2020-10-27 04:41:35 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.436° N, 178.783° 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 4.3 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 129°
Stations used: 132

Nearby

Within 100 km, magnitude 1.5 and up: 120 in the 60 days after this one and 77 in the 30 days before it.

After

The first 60 of 120.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000cdly (also filed as ak020dtve1rk). Read Sun, Sep 27, 2026, 6:46 AM UTC.