Alaska earthquakes

M1.8 earthquake 20 km WSW of Atka, Alaska

A magnitude 1.8 earthquake struck 20 km WSW of Atka, Alaska on Wed, Aug 23, 2023, 7:39 PM HADT (04:39 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M4.2 79 km SSE of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 1.8 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Wed, Aug 23, 2023, 7:39 PM HADT
UTC: 2023-08-24 04:39:01 UTC
Depth: 11.6 km (7.2 mi), shallow
Epicenter: 52.136° N, 174.480° W
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
1.8	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
1.88	ML, local (Richter)	AV	Final · ±0.186639007051381 · 11 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: 168 in the 60 days after this one and 99 in the 30 days before it.

After

The first 60 of 168.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak023audg00a (also filed as av92018671). Read Thu, Oct 1, 2026, 10:39 AM UTC.