Alaska earthquakes

M2.5 earthquake 49 km E of Adak, Alaska

A magnitude 2.5 earthquake struck 49 km E of Adak, Alaska on Fri, Jul 31, 2020, 9:23 PM HADT (06:23 UTC), 111 km (69 mi) below the surface.

A larger quake followed: M4.0 72 km NE 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: 2.5 (ml), micro
Local time: Fri, Jul 31, 2020, 9:23 PM HADT
UTC: 2020-08-01 06:23:20 UTC
Depth: 110.6 km (68.7 mi), intermediate-depth
Epicenter: 51.947° N, 175.923° 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 13.7 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 178°
Stations used: 28

Nearby

Within 100 km, magnitude 1.5 and up: 159 in the 60 days after this one and 80 in the 30 days before it.

After

The first 60 of 159.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000bfvl (also filed as ak0209u0pusl). Read Tue, Sep 29, 2026, 3:13 AM UTC.