Alaska earthquakes

M3.3 earthquake 261 km W of Adak, Alaska

A magnitude 3.3 earthquake struck 261 km W of Adak, Alaska on Sat, Jul 25, 2020, 10:38 PM GMT+12 (10:38 UTC), 91 km (56 mi) below the surface.

A larger quake followed: M4.6 294 km WSW 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: 3.3 (ml), minor
Local time: Sat, Jul 25, 2020, 10:38 PM GMT+12
UTC: 2020-07-25 10:38:52 UTC
Depth: 90.5 km (56.2 mi), intermediate-depth
Epicenter: 51.644° N, 179.590° E
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 15.8 km horizontally, 8.3 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 120°
Stations used: 39

Nearby

Within 100 km, magnitude 1.5 and up: 140 in the 60 days after this one and 64 in the 30 days before it.

After

The first 60 of 140.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000bce4 (also filed as ak0209iiffkb). Read Tue, Sep 29, 2026, 12:38 AM UTC.