Alaska earthquakes

M2.8 earthquake 217 km SE of Atka, Alaska

A magnitude 2.8 earthquake struck 217 km SE of Atka, Alaska on Sat, Sep 4, 2021, 12:16 AM HADT (09:16 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.9 122 km SE of Atka, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude
2.8 (ml), micro
Local time
UTC
2021-09-04 09:16:41 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.920° N, 171.815° 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 3.5 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
237°, poorly surrounded by stations
Stations used
23

Nearby

Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 2.8253 km SSW of Nikolski, Alaska · 1843 days ago · 15 km deep · 96 km away
  2. 2.9122 km SE of Atka, Alaska · 1837 days ago · 30 km deep · 96 km away
  3. 2.7138 km SE of Atka, Alaska · 1790 days ago · 10 km deep · 84 km away

Before

  1. 2.2180 km SSE of Atka, Alaska · 1847 days ago · 22 km deep · 93 km away
  2. 2.2140 km SE of Atka, Alaska · 1848 days ago · 14 km deep · 79 km away
  3. 2.0163 km SE of Atka, Alaska · 1858 days ago · 20 km deep · 62 km away
  4. 3.0167 km SE of Atka, Alaska · 1859 days ago · 10 km deep · 52 km away
  5. 2.9178 km SE of Atka, Alaska · 1860 days ago · 10 km deep · 45 km away
  6. 2.8197 km SE of Atka, Alaska · 1861 days ago · 10 km deep · 53 km away
  7. 2.6211 km SSE of Atka, Alaska · 1867 days ago · 10 km deep · 79 km away
  8. 2.2187 km SE of Atka, Alaska · 1869 days ago · 3 km deep · 51 km away
  9. 2.7173 km SSE of Atka, Alaska · 1873 days ago · 22 km deep · 86 km away
  10. 3.2185 km ESE of Atka, Alaska · 1876 days ago · 36 km deep · 90 km away
  11. 3.0171 km SSE of Atka, Alaska · 1876 days ago · 17 km deep · 95 km away
  12. 3.0186 km SSE of Atka, Alaska · 1876 days ago · 10 km deep · 95 km away
  13. 3.1200 km SSE of Atka, Alaska · 1876 days ago · 30 km deep · 88 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fe64 (also filed as ak021bcn75bn). Read Thu, Sep 24, 2026, 8:39 AM UTC.