Alaska earthquakes

M4.4 earthquake 138 km WSW of Adak, Alaska

A magnitude 4.4 earthquake struck 138 km WSW of Adak, Alaska on Thu, Sep 3, 2020, 2:35 PM HADT (23:35 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.8 193 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: 4.4 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Thu, Sep 3, 2020, 2:35 PM HADT
UTC: 2020-09-03 23:35:56 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.259° N, 178.375° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.4	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.029 · 344 stations
4.4	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.7 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.03
Depth from: Operator assigned
Station coverage gap: 132°
Stations used: 418

Nearby

Within 100 km, magnitude 1.5 and up: 151 in the 60 days after this one and 104 in the 30 days before it.

After

The first 60 of 151.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000bhj9 (also filed as ak020bcvnb9q). Read Thu, Oct 1, 2026, 12:32 PM UTC.