Alaska earthquakes

M1.9 earthquake 180 km S of Adak, Alaska

A magnitude 1.9 earthquake struck 180 km S of Adak, Alaska on Wed, Aug 4, 2021, 4:42 PM HADT (01:42 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M4.5 161 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
1.9 (ml), micro
Local time
UTC
2021-08-05 01:42:23 UTC
Depth
23.8 km (14.8 mi), shallow
Epicenter
50.264° N, 176.262° 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
24

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 15 in the 30 days before it.

After

  1. 1.6101 km SSE of Adak, Alaska · 1878 days ago · 24 km deep · 91 km away
  2. 3.2198 km S of Adak, Alaska · 1872 days ago · 10 km deep · 46 km away
  3. 1.9241 km S of Adak, Alaska · 1867 days ago · 12 km deep · 85 km away
  4. 1.7209 km S of Adak, Alaska · 1866 days ago · 21 km deep · 63 km away
  5. 3.4200 km SSW of Adak, Alaska · 1866 days ago · 10 km deep · 74 km away
  6. 1.9170 km SE of Adak, Alaska · 1860 days ago · 10 km deep · 91 km away
  7. 1.6Andreanof Islands, Aleutian Islands, Alaska · 1860 days ago · 15 km deep · 92 km away
  8. 2.0183 km S of Adak, Alaska · 1856 days ago · 25 km deep · 58 km away
  9. 1.8147 km S of Adak, Alaska · 1853 days ago · 25 km deep · 33 km away
  10. 1.992 km SSE of Adak, Alaska · 1852 days ago · 14 km deep · 92 km away
  11. 2.8182 km SE of Adak, Alaska · 1852 days ago · 29 km deep · 88 km away
  12. 1.7111 km S of Adak, Alaska · 1848 days ago · 35 km deep · 83 km away
  13. 2.7105 km SSE of Adak, Alaska · 1847 days ago · 10 km deep · 76 km away
  14. 4.5161 km S of Adak, Alaska · 1840 days ago · 10 km deep · 20 km away
  15. 2.4163 km S of Adak, Alaska · 1840 days ago · 24 km deep · 18 km away
  16. 3.1164 km S of Adak, Alaska · 1839 days ago · 10 km deep · 17 km away
  17. 3.1Andreanof Islands, Aleutian Islands, Alaska · 1830 days ago · 10 km deep · 6 km away

Before

  1. 1.897 km S of Adak, Alaska · 1885 days ago · 26 km deep · 89 km away
  2. 1.9100 km SSE of Adak, Alaska · 1888 days ago · 14 km deep · 81 km away
  3. 1.8164 km S of Adak, Alaska · 1890 days ago · 17 km deep · 44 km away
  4. 1.587 km S of Adak, Alaska · 1890 days ago · 39 km deep · 94 km away
  5. 3.988 km S of Adak, Alaska · 1891 days ago · 23 km deep · 92 km away
  6. 3.892 km S of Adak, Alaska · 1891 days ago · 14 km deep · 89 km away
  7. 3.889 km S of Adak, Alaska · 1891 days ago · 16 km deep · 92 km away
  8. 4.087 km S of Adak, Alaska · 1891 days ago · 10 km deep · 94 km away
  9. 1.585 km S of Adak, Alaska · 1893 days ago · 17 km deep · 96 km away
  10. 1.986 km S of Adak, Alaska · 1893 days ago · 26 km deep · 95 km away
  11. 1.9170 km SSW of Adak, Alaska · 1893 days ago · 26 km deep · 69 km away
  12. 3.694 km SSE of Adak, Alaska · 1897 days ago · 25 km deep · 87 km away
  13. 1.6183 km S of Adak, Alaska · 1903 days ago · 5 km deep · 35 km away
  14. 1.6Andreanof Islands, Aleutian Islands, Alaska · 1904 days ago · 33 km deep · 99 km away
  15. 2.1110 km SE of Adak, Alaska · 1906 days ago · 13 km deep · 97 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0219ywgsol. Read Tue, Sep 29, 2026, 12:09 PM UTC.