Alaska earthquakes

M2.8 earthquake 192 km SE of Nikolski, Alaska

A magnitude 2.8 earthquake struck 192 km SE of Nikolski, Alaska on Sun, Aug 8, 2021, 7:18 PM AKDT (03:18 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.5 147 km ESE of Nikolski, Alaska. This one was a foreshock.

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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), micro
Local time
UTC
2021-08-09 03:18:50 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
51.942° N, 166.542° 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
±0.10
Depth from
Operator assigned
Station coverage gap
272°, poorly surrounded by stations
Stations used
25

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 2.0137 km S of Unalaska, Alaska · 1872 days ago · 9 km deep · 80 km away
  2. 1.5141 km S of Unalaska, Alaska · 1869 days ago · 13 km deep · 77 km away
  3. 3.5147 km ESE of Nikolski, Alaska · 1868 days ago · 18 km deep · 59 km away
  4. 1.8151 km ESE of Nikolski, Alaska · 1860 days ago · 18 km deep · 64 km away
  5. 2.8185 km SSE of Unalaska, Alaska · 1856 days ago · 10 km deep · 51 km away
  6. 1.9161 km SSE of Nikolski, Alaska · 1851 days ago · 22 km deep · 92 km away
  7. 1.8135 km ESE of Nikolski, Alaska · 1851 days ago · 25 km deep · 66 km away
  8. 2.0152 km ESE of Nikolski, Alaska · 1850 days ago · 15 km deep · 62 km away
  9. 1.9140 km ESE of Nikolski, Alaska · 1848 days ago · 14 km deep · 70 km away
  10. 1.9136 km ESE of Nikolski, Alaska · 1848 days ago · 7 km deep · 80 km away
  11. 2.3177 km SE of Nikolski, Alaska · 1845 days ago · 26 km deep · 52 km away
  12. 3.6127 km S of Unalaska, Alaska · 1843 days ago · 7 km deep · 89 km away
  13. 1.8144 km S of Unalaska, Alaska · 1843 days ago · 26 km deep · 70 km away
  14. 1.7143 km S of Unalaska, Alaska · 1843 days ago · 21 km deep · 72 km away
  15. 1.6124 km S of Unalaska, Alaska · 1843 days ago · 2 km deep · 93 km away
  16. 2.5107 km ESE of Nikolski, Alaska · 1815 days ago · 23 km deep · 86 km away
  17. 1.8105 km ESE of Nikolski, Alaska · 1812 days ago · 17 km deep · 92 km away

Before

  1. 2.0144 km ESE of Nikolski, Alaska · 1877 days ago · 25 km deep · 69 km away
  2. 2.5187 km S of Unalaska, Alaska · 1877 days ago · 10 km deep · 49 km away
  3. 2.8195 km SSE of Unalaska, Alaska · 1880 days ago · 10 km deep · 85 km away
  4. 1.8192 km SSE of Unalaska, Alaska · 1887 days ago · 19 km deep · 83 km away
  5. 2.6185 km SE of Nikolski, Alaska · 1887 days ago · 21 km deep · 38 km away
  6. 1.6141 km ESE of Nikolski, Alaska · 1888 days ago · 11 km deep · 73 km away
  7. 1.6125 km S of Unalaska, Alaska · 1896 days ago · 17 km deep · 90 km away
  8. 1.9141 km ESE of Nikolski, Alaska · 1897 days ago · 25 km deep · 61 km away
  9. 2.2210 km SSE of Unalaska, Alaska · 1901 days ago · 12 km deep · 89 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f7m0 (also filed as ak021a5jnyrd). Read Wed, Sep 23, 2026, 3:47 PM UTC.