Alaska earthquakes

M3.0 earthquake 148 km W of Adak, Alaska

A magnitude 3.0 earthquake struck 148 km W of Adak, Alaska on Sat, May 21, 2022, 10:33 AM HADT (19:33 UTC), 25 km (16 mi) below the surface.

A larger quake followed: M5.0 129 km WSW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.0 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, May 21, 2022, 10:33 AM HADT
UTC: 2022-05-21 19:33:45 UTC
Depth: 25.1 km (15.6 mi), shallow
Epicenter: 51.927° N, 178.786° 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
3.0	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.115 · 10 stations
2.5	ML, local (Richter)	Alaska Earthquake Center	Preliminary
2.63	ML, local (Richter)	AV	Final · ±0.224808499323428 · 24 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 6.0 km horizontally, 7.2 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 165°
Stations used: 16

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 92 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000hn64 (also filed as av91569036, ak0226hiac86). Read Fri, Oct 2, 2026, 3:28 PM UTC.