Alaska earthquakes

M3.0 earthquake 237 km W of Adak, Alaska

A magnitude 3.0 earthquake struck 237 km W of Adak, Alaska on Sun, Aug 23, 2026, 11:13 AM HADT (20:13 UTC), 179 km (111 mi) below the surface.

A larger quake followed: M4.4 263 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.0 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Aug 23, 2026, 11:13 AM HADT
UTC: 2026-08-23 20:13:43 UTC
Depth: 178.8 km (111.1 mi), intermediate-depth
Epicenter: 51.993° N, 179.913° 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
3.0	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Confirmed · ±0.091 · 16 stations
2.5	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.3 · 17 stations

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 9.4 km horizontally, 2.8 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 153°
Stations used: 19

Nearby

Within 100 km, magnitude 1.5 and up: 57 since this one and 58 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000tn9m (also filed as aka2026qrtpin). Read Thu, Oct 1, 2026, 6:00 PM UTC.