Alaska earthquakes

M2.3 earthquake 115 km SSE of Ugashik, Alaska

A magnitude 2.3 earthquake struck 115 km SSE of Ugashik, Alaska on Sat, Jul 17, 2021, 12:33 PM AKDT (20:33 UTC), 47 km (29 mi) below the surface.

A larger quake followed: M5.7 99 km ESE of Chignik, Alaska. This one was a foreshock.

Naknek forecast More in Alaska

Map

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

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The earthquake

Magnitude: 2.3 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Sat, Jul 17, 2021, 12:33 PM AKDT
UTC: 2021-07-17 20:33:46 UTC
Depth: 46.5 km (28.9 mi), shallow
Epicenter: 56.614° N, 156.442° 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
2.3	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.056 · 42 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: 50

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Naknek, AlaskaPopulation 544. Forecast238 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 155 in the 60 days after this one and 19 in the 30 days before it.

After

The first 60 of 155.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak02193sik30 (also filed as us7000emzs). Read Thu, Oct 1, 2026, 10:56 AM UTC.