Alaska earthquakes

M2.5 earthquake 241 km WNW of Adak, Alaska

A magnitude 2.5 earthquake struck 241 km WNW of Adak, Alaska on Fri, May 28, 2021, 4:15 PM HADT (01:15 UTC), 92 km (57 mi) below the surface.

A larger quake followed: M3.8 170 km WNW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
2.5 (ml), micro
Local time
UTC
2021-05-29 01:15:34 UTC
Depth
92.1 km (57.2 mi), intermediate-depth
Epicenter
52.680° N, 179.920° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

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 14.5 km horizontally, 32.3 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
255°, poorly surrounded by stations
Stations used
23

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 1 in the 30 days before it.

After

Before

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000edy3 (also filed as ak0216ufrfkm). Read Fri, Sep 25, 2026, 9:48 PM UTC.