Alaska earthquakes

M2.9 earthquake 188 km SSE of Unalaska, Alaska

A magnitude 2.9 earthquake struck 188 km SSE of Unalaska, Alaska on Mon, Oct 4, 2021, 12:51 PM AKDT (20:51 UTC), 42 km (26 mi) below the surface.

A larger quake followed: M3.1 199 km S of Unalaska, 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
2.9 (ml), micro
Local time
UTC
2021-10-04 20:51:48 UTC
Depth
42.0 km (26.1 mi), shallow
Epicenter
52.472° N, 164.963° 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.

Stations used
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.2161 km SSE of Unalaska, Alaska · 1813 days ago · 9 km deep · 27 km away
  2. 3.0138 km SE of Unalaska, Alaska · 1803 days ago · 8 km deep · 50 km away
  3. 1.8109 km SE of Unalaska, Alaska · 1795 days ago · 15 km deep · 78 km away
  4. 2.4235 km SSE of Akutan, Alaska · 1794 days ago · 12 km deep · 58 km away
  5. 1.694 km SE of Unalaska, Alaska · 1794 days ago · 22 km deep · 94 km away
  6. 2.2114 km SSE of Unalaska, Alaska · 1792 days ago · 21 km deep · 74 km away
  7. 2.8194 km SE of Unalaska, Alaska · 1789 days ago · 5 km deep · 12 km away
  8. 3.1199 km S of Unalaska, Alaska · 1785 days ago · 10 km deep · 83 km away
  9. 2.7172 km SSE of Akutan, Alaska · 1781 days ago · 10 km deep · 38 km away
  10. 2.5128 km SE of Akutan, Alaska · 1779 days ago · 10 km deep · 81 km away
  11. 2.4138 km SE of Akutan, Alaska · 1776 days ago · 22 km deep · 91 km away
  12. 2.390 km SE of Unalaska, Alaska · 1775 days ago · 46 km deep · 99 km away
  13. 2.7120 km SE of Akutan, Alaska · 1775 days ago · 35 km deep · 94 km away
  14. 2.0140 km S of Unalaska, Alaska · 1768 days ago · 26 km deep · 94 km away
  15. 1.9139 km SE of Akutan, Alaska · 1768 days ago · 26 km deep · 81 km away

Before

  1. 2.6209 km SE of Akutan, Alaska · 1832 days ago · 10 km deep · 71 km away
  2. 2.6195 km SE of Akutan, Alaska · 1841 days ago · 18 km deep · 94 km away
  3. 2.4217 km SE of Akutan, Alaska · 1841 days ago · 12 km deep · 94 km away
  4. 2.9194 km SE of Akutan, Alaska · 1845 days ago · 10 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021cqg2tco. Read Wed, Sep 30, 2026, 4:08 PM UTC.