Alaska earthquakes

M3.9 earthquake 47 km ENE of Kodiak, Alaska

A magnitude 3.9 earthquake struck 47 km ENE of Kodiak, Alaska on Mon, Aug 2, 2021, 1:13 PM AKDT (21:13 UTC), 14 km (9 mi) below the surface.

Kodiak 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
3.9 (ML, local (Richter)), minor
Magnitude from
Alaska Earthquake Center
Local time
UTC
2021-08-02 21:13:11 UTC
Depth
14.1 km (8.8 mi), shallow
Epicenter
57.995° N, 151.695° W
Region
Alaska
Felt reports
1
Strongest shaking
III, weak shaking
Tsunami flag
No
Status
Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.ScaleComputed byNotes
3.9ML, local (Richter)Alaska Earthquake CenterPreferred · Preliminary
4.0mb, body-waveUSGS National Earthquake Information CenterReviewed · ±0.299 · 3 stations

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
III, weak shaking
Peak ground acceleration
0.3% of gravity
Peak ground velocity
-2.3 cm/s
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt 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
162

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 17 in the 30 days before it.

After

  1. 1.897 km ENE of Ouzinkie, Alaska · 1887 days ago · 24 km deep · 54 km away
  2. 1.89 km NE of Chiniak, Alaska · 1884 days ago · 18 km deep · 47 km away
  3. 1.821 km WSW of Womens Bay, Alaska · 1881 days ago · 47 km deep · 88 km away
  4. 2.359 km ENE of Ouzinkie, Alaska · 1881 days ago · 16 km deep · 12 km away
  5. 1.9100 km NE of Ouzinkie, Alaska · 1880 days ago · 12 km deep · 62 km away
  6. 1.610 km NNE of Port Lions, Alaska · 1879 days ago · 46 km deep · 66 km away
  7. 2.942 km NNW of Aleneva, Alaska · 1876 days ago · 63 km deep · 99 km away
  8. 2.176 km NE of Aleneva, Alaska · 1875 days ago · 46 km deep · 69 km away
  9. 2.256 km SSW of Nanwalek, Alaska · 1873 days ago · 58 km deep · 100 km away
  10. 1.876 km S of Port Graham, Alaska · 1871 days ago · 44 km deep · 75 km away
  11. 1.570 km ENE of Ouzinkie, Alaska · 1871 days ago · 26 km deep · 28 km away
  12. 1.6109 km ENE of Ouzinkie, Alaska · 1870 days ago · 34 km deep · 65 km away
  13. 1.538 km NNE of Aleneva, Alaska · 1868 days ago · 46 km deep · 64 km away
  14. 1.535 km NNE of Aleneva, Alaska · 1868 days ago · 63 km deep · 74 km away
  15. 1.991 km ENE of Ouzinkie, Alaska · 1865 days ago · 25 km deep · 46 km away
  16. 2.815 km NE of Kodiak, Alaska · 1864 days ago · 42 km deep · 33 km away · felt by 1
  17. 2.114 km ENE of Chiniak, Alaska · 1856 days ago · 9 km deep · 44 km away
  18. 2.492 km ENE of Ouzinkie, Alaska · 1847 days ago · 2 km deep · 48 km away
  19. 2.666 km ENE of Ouzinkie, Alaska · 1846 days ago · 41 km deep · 23 km away
  20. 1.633 km N of Aleneva, Alaska · 1836 days ago · 43 km deep · 81 km away
  21. 2.061 km ENE of Ouzinkie, Alaska · 1833 days ago · 25 km deep · 15 km away
  22. 1.846 km NNE of Ouzinkie, Alaska · 1833 days ago · 66 km deep · 43 km away
  23. 2.070 km SSW of Nanwalek, Alaska · 1828 days ago · 59 km deep · 95 km away

Before

  1. 2.168 km NNE of Ouzinkie, Alaska · 1888 days ago · 45 km deep · 56 km away
  2. 1.8117 km ENE of Ouzinkie, Alaska · 1891 days ago · 6 km deep · 70 km away
  3. 2.8104 km ENE of Ouzinkie, Alaska · 1894 days ago · 6 km deep · 60 km away
  4. 1.686 km ENE of Ouzinkie, Alaska · 1896 days ago · 25 km deep · 42 km away
  5. 2.198 km ENE of Ouzinkie, Alaska · 1896 days ago · 3 km deep · 53 km away
  6. 2.047 km ENE of Ouzinkie, Alaska · 1898 days ago · 34 km deep · 6 km away
  7. 1.761 km S of Port Graham, Alaska · 1899 days ago · 56 km deep · 91 km away
  8. 3.247 km ENE of Kodiak, Alaska · 1901 days ago · 15 km deep · 1 km away
  9. 1.6104 km ENE of Chiniak, Alaska · 1902 days ago · 17 km deep · 61 km away
  10. 1.796 km ENE of Ouzinkie, Alaska · 1903 days ago · 10 km deep · 54 km away
  11. 2.088 km ENE of Ouzinkie, Alaska · 1905 days ago · 46 km deep · 41 km away
  12. 1.562 km NE of Ouzinkie, Alaska · 1905 days ago · 8 km deep · 35 km away
  13. 1.680 km ENE of Ouzinkie, Alaska · 1906 days ago · 26 km deep · 35 km away
  14. 1.874 km ENE of Ouzinkie, Alaska · 1907 days ago · 28 km deep · 30 km away
  15. 2.280 km ENE of Ouzinkie, Alaska · 1911 days ago · 45 km deep · 36 km away
  16. 1.974 km NNE of Aleneva, Alaska · 1914 days ago · 75 km deep · 97 km away
  17. 1.534 km N of Aleneva, Alaska · 1916 days ago · 65 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0219u9l6k5 (also filed as us6000f1ma). Read Fri, Oct 2, 2026, 10:58 PM UTC.