Alaska earthquakes

M2.8 earthquake Alaska Peninsula

A magnitude 2.8 earthquake struck in the Alaska Peninsula on Sat, May 20, 2023, 1:10 PM AKDT (21:10 UTC), 147 km (91 mi) below the surface.

A larger quake followed: M3.4 29 km ESE of Nelson Lagoon, Alaska. This one was a foreshock.

Sand Point 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: 2.8 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, May 20, 2023, 1:10 PM AKDT
UTC: 2023-05-20 21:10:26 UTC
Depth: 146.7 km (91.2 mi), intermediate-depth
Epicenter: 55.843° N, 161.059° 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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.105 · 12 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 4.6 km horizontally, 7.8 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 169°
Stations used: 15

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast66 kmNNW

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 16 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 us7000k762 (also filed as ak0236fvswcu). Read Thu, Oct 1, 2026, 10:26 PM UTC.