Alaska earthquakes

M3.3 earthquake 8 km NW of Harding-Birch Lakes, Alaska

A magnitude 3.3 earthquake struck 8 km NW of Harding-Birch Lakes, Alaska on Sat, Oct 23, 2021, 7:51 PM AKDT (03:51 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.1 31 km SW of Salcha, Alaska. This one was a foreshock.

Salcha forecastMore in Alaska

Map

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

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The earthquake

Magnitude
3.3 (ml), minor
Local time
UTC
2021-10-24 03:51:42 UTC
Depth
7.7 km (4.8 mi), shallow
Epicenter
64.434° N, 146.707° W
Region
Alaska
Felt reports
11
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

11 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Stations used
139

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 24 in the 60 days after this one and 15 in the 30 days before it.

After

  1. 1.814 km WSW of Salcha, Alaska · 1800 days ago · 8 km deep · 25 km away
  2. 1.78 km NW of Harding-Birch Lakes, Alaska · 1798 days ago · 5 km deep · 0 km away
  3. 2.169 km E of Denali Park, Alaska · 1798 days ago · 74 km deep · 98 km away
  4. 2.376 km E of Denali Park, Alaska · 1793 days ago · 80 km deep · 95 km away
  5. 2.210 km NW of Harding-Birch Lakes, Alaska · 1789 days ago · 11 km deep · 2 km away · felt by 1
  6. 3.132 km WSW of Salcha, Alaska · 1788 days ago · 8 km deep · 39 km away · felt by 46
  7. 4.131 km SW of Salcha, Alaska · 1788 days ago · 8 km deep · 36 km away · felt by 179
  8. 1.528 km WSW of Salcha, Alaska · 1788 days ago · 2 km deep · 35 km away
  9. 1.928 km WSW of Salcha, Alaska · 1788 days ago · 11 km deep · 36 km away
  10. 1.58 km NW of Harding-Birch Lakes, Alaska · 1788 days ago · 4 km deep · 1 km away
  11. 2.241 km SSW of South Van Horn, Alaska · 1786 days ago · 7 km deep · 62 km away
  12. 1.830 km WSW of Salcha, Alaska · 1786 days ago · 6 km deep · 37 km away
  13. 1.528 km WSW of Salcha, Alaska · 1784 days ago · 15 km deep · 36 km away
  14. 2.420 km N of Pleasant Valley, Alaska · 1780 days ago · 16 km deep · 70 km away
  15. 1.622 km ENE of Four Mile Road, Alaska · 1772 days ago · 17 km deep · 99 km away
  16. 2.15 km ENE of Badger, Alaska · 1771 days ago · 17 km deep · 55 km away
  17. 1.534 km E of Clear, Alaska, Alaska · 1770 days ago · 4 km deep · 87 km away
  18. 1.78 km NW of Harding-Birch Lakes, Alaska · 1766 days ago · 5 km deep · 0 km away
  19. 1.54 km NNE of Fox, Alaska · 1763 days ago · 17 km deep · 76 km away
  20. 1.729 km WSW of Salcha, Alaska · 1760 days ago · 7 km deep · 37 km away
  21. 1.529 km WSW of Salcha, Alaska · 1758 days ago · 5 km deep · 36 km away
  22. 2.39 km NW of Harding-Birch Lakes, Alaska · 1753 days ago · 7 km deep · 2 km away · felt by 1
  23. 2.79 km NW of Harding-Birch Lakes, Alaska · 1749 days ago · 8 km deep · 2 km away · felt by 1
  24. 1.674 km E of Denali Park, Alaska · 1743 days ago · 83 km deep · 93 km away

Before

  1. 1.543 km SW of Salcha, Alaska · 1801 days ago · 10 km deep · 43 km away
  2. 2.6Central Alaska · 1802 days ago · 8 km deep · 2 km away
  3. 1.610 km W of Salcha, Alaska · 1804 days ago · 0 km deep · 23 km away
  4. 1.57 km NNW of Harding-Birch Lakes, Alaska · 1805 days ago · 4 km deep · 1 km away
  5. 1.6Central Alaska · 1816 days ago · 1 km deep · 98 km away
  6. 2.014 km SW of North Pole, Alaska · 1816 days ago · 7 km deep · 48 km away · felt by 1
  7. 1.523 km WSW of Ester, Alaska · 1816 days ago · 8 km deep · 91 km away
  8. 2.584 km ESE of Denali Park, Alaska · 1818 days ago · 3 km deep · 97 km away
  9. 2.114 km SW of North Pole, Alaska · 1819 days ago · 12 km deep · 48 km away · felt by 2
  10. 1.784 km ESE of Denali Park, Alaska · 1820 days ago · 4 km deep · 97 km away
  11. 2.383 km E of Denali Park, Alaska · 1820 days ago · 13 km deep · 97 km away
  12. 2.482 km ESE of Denali Park, Alaska · 1820 days ago · 13 km deep · 97 km away
  13. 1.93 km SSE of Badger, Alaska · 1824 days ago · 13 km deep · 53 km away
  14. 1.965 km WSW of Delta Junction, Alaska · 1827 days ago · 0 km deep · 77 km away
  15. 1.984 km SW of Delta Junction, Alaska · 1831 days ago · 68 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021dn8pea2 (also filed as us6000fx4n). Read Tue, Sep 29, 2026, 6:17 AM UTC.