Alaska earthquakes

M2.9 earthquake 243 km W of Adak, Alaska

A magnitude 2.9 earthquake struck 243 km W of Adak, Alaska on Tue, Sep 19, 2023, 11:50 PM GMT+12 (11:50 UTC), 90 km (56 mi) below the surface.

A larger quake followed: M4.2 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.9 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Sep 19, 2023, 11:50 PM GMT+12
UTC: 2023-09-19 11:50:31 UTC
Depth: 89.9 km (55.9 mi), intermediate-depth
Epicenter: 51.711° N, 179.847° E
Region: Alaska
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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.081 · 20 stations
2.6	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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 10.8 km horizontally, 5.1 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 125°
Stations used: 25

Nearby

Within 100 km, magnitude 1.5 and up: 147 in the 60 days after this one and 100 in the 30 days before it.

After

The first 60 of 147.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000lccu (also filed as ak023c1hnhb6). Read Thu, Oct 1, 2026, 10:06 AM UTC.