Alaska earthquakes

M3.2 earthquake 163 km E of Atka, Alaska

A magnitude 3.2 earthquake struck 163 km E of Atka, Alaska on Tue, May 18, 2021, 2:39 PM HADT (23:39 UTC), 28 km (17 mi) below the surface.

A larger quake followed: M3.8 154 km SW of Nikolski, Alaska. This one was a foreshock.

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The earthquake

Magnitude
3.2 (ml), minor
Local time
UTC
2021-05-18 23:39:02 UTC
Depth
27.9 km (17.3 mi), shallow
Epicenter
52.122° N, 171.814° 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 3.3 km horizontally, 13.2 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
205°, poorly surrounded by stations
Stations used
17

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 3.8154 km SW of Nikolski, Alaska · 1949 days ago · 35 km deep · 91 km away
  2. 3.8223 km SW of Nikolski, Alaska · 1925 days ago · 29 km deep · 84 km away
  3. 4.6125 km ESE of Atka, Alaska · 1912 days ago · 21 km deep · 47 km away
  4. 2.572 km ENE of Atka, Alaska · 1906 days ago · 107 km deep · 97 km away
  5. 2.589 km ESE of Atka, Alaska · 1905 days ago · 63 km deep · 77 km away
  6. 2.2178 km SW of Nikolski, Alaska · 1898 days ago · 24 km deep · 61 km away

Before

  1. 3.8189 km ESE of Atka, Alaska · 1960 days ago · 38 km deep · 37 km away
  2. 4.9128 km WSW of Nikolski, Alaska · 1969 days ago · 54 km deep · 92 km away
  3. 2.968 km E of Atka, Alaska · 1978 days ago · 223 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000e4ap (also filed as ak0216cm39il). Read Thu, Sep 24, 2026, 8:39 AM UTC.