Alaska earthquakes

M3.7 earthquake 116 km SW of Nikolski, Alaska

A magnitude 3.7 earthquake struck 116 km SW of Nikolski, Alaska on Mon, Apr 20, 2020, 4:22 AM HADT (13:22 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.8 98 km SSW of Nikolski, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude
3.7 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-04-20 13:22:44 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
52.160° N, 170.000° W
Region
Alaska
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
3.7mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.178 · 8 stations
3.1ML, local (Richter)Alaska Earthquake CenterPreliminary

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 7.3 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.18
Depth from
Operator assigned
Station coverage gap
181°, poorly surrounded by stations
Stations used
45

Nearby

Within 100 km, magnitude 1.5 and up: 40 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 4.655 km WSW of Nikolski, Alaska · 2358 days ago · 10 km deep · 68 km away
  2. 2.958 km SW of Nikolski, Alaska · 2358 days ago · 10 km deep · 61 km away
  3. 3.9195 km SW of Nikolski, Alaska · 2357 days ago · 19 km deep · 80 km away
  4. 2.462 km WSW of Nikolski, Alaska · 2356 days ago · 26 km deep · 61 km away
  5. 2.362 km WSW of Nikolski, Alaska · 2356 days ago · 44 km deep · 59 km away
  6. 2.551 km SW of Nikolski, Alaska · 2355 days ago · 6 km deep · 65 km away
  7. 2.129 km SW of Nikolski, Alaska · 2355 days ago · 4 km deep · 87 km away
  8. 2.541 km SW of Nikolski, Alaska · 2355 days ago · 10 km deep · 76 km away
  9. 2.236 km WSW of Nikolski, Alaska · 2355 days ago · 5 km deep · 82 km away
  10. 3.6175 km SW of Nikolski, Alaska · 2355 days ago · 27 km deep · 61 km away
  11. 2.841 km WSW of Nikolski, Alaska · 2355 days ago · 12 km deep · 81 km away
  12. 3.6185 km SW of Nikolski, Alaska · 2355 days ago · 26 km deep · 69 km away
  13. 4.1208 km SW of Nikolski, Alaska · 2355 days ago · 10 km deep · 93 km away
  14. 2.249 km SW of Nikolski, Alaska · 2354 days ago · 4 km deep · 67 km away
  15. 1.750 km SW of Nikolski, Alaska · 2352 days ago · 6 km deep · 69 km away
  16. 2.1Fox Islands, Aleutian Islands, Alaska · 2351 days ago · 5 km deep · 74 km away
  17. 2.949 km SW of Nikolski, Alaska · 2350 days ago · 10 km deep · 67 km away
  18. 3.292 km SSW of Nikolski, Alaska · 2349 days ago · 35 km deep · 44 km away
  19. 3.0186 km SW of Nikolski, Alaska · 2347 days ago · 37 km deep · 78 km away
  20. 3.7173 km WSW of Nikolski, Alaska · 2342 days ago · 57 km deep · 96 km away
  21. 3.4159 km WSW of Nikolski, Alaska · 2339 days ago · 35 km deep · 72 km away
  22. 4.499 km SSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 44 km away
  23. 3.396 km SSW of Nikolski, Alaska · 2332 days ago · 18 km deep · 45 km away
  24. 4.582 km SSW of Nikolski, Alaska · 2332 days ago · 35 km deep · 39 km away
  25. 4.4110 km SSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 51 km away
  26. 4.590 km SSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 34 km away
  27. 4.898 km SSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 45 km away
  28. 3.989 km SSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 48 km away
  29. 3.282 km WSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 44 km away
  30. 3.895 km SSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 49 km away
  31. 3.787 km SSW of Nikolski, Alaska · 2332 days ago · 10 km deep · 46 km away
  32. 3.7169 km SSW of Nikolski, Alaska · 2326 days ago · 10 km deep · 85 km away
  33. 3.8136 km WSW of Nikolski, Alaska · 2325 days ago · 54 km deep · 43 km away
  34. 3.8149 km SW of Nikolski, Alaska · 2321 days ago · 35 km deep · 34 km away
  35. 3.7198 km SW of Nikolski, Alaska · 2316 days ago · 35 km deep · 88 km away
  36. 2.2170 km WSW of Nikolski, Alaska · 2313 days ago · 24 km deep · 79 km away
  37. 3.651 km WSW of Nikolski, Alaska · 2310 days ago · 10 km deep · 77 km away
  38. 1.951 km WSW of Nikolski, Alaska · 2310 days ago · 14 km deep · 75 km away
  39. 2.258 km W of Nikolski, Alaska · 2303 days ago · 5 km deep · 85 km away
  40. 3.573 km W of Nikolski, Alaska · 2303 days ago · 10 km deep · 94 km away

Before

  1. 3.6154 km SSW of Nikolski, Alaska · 2363 days ago · 57 km deep · 43 km away
  2. 4.190 km SW of Nikolski, Alaska · 2365 days ago · 35 km deep · 26 km away
  3. 3.6195 km E of Atka, Alaska · 2366 days ago · 35 km deep · 95 km away
  4. 3.1197 km SW of Nikolski, Alaska · 2367 days ago · 35 km deep · 83 km away
  5. 3.9121 km WSW of Nikolski, Alaska · 2369 days ago · 108 km deep · 76 km away
  6. 4.1180 km WSW of Nikolski, Alaska · 2370 days ago · 46 km deep · 82 km away
  7. 2.7107 km SSW of Nikolski, Alaska · 2372 days ago · 10 km deep · 53 km away
  8. 2.661 km WSW of Nikolski, Alaska · 2373 days ago · 19 km deep · 67 km away
  9. 3.6134 km SW of Nikolski, Alaska · 2376 days ago · 35 km deep · 33 km away
  10. 3.4129 km WSW of Nikolski, Alaska · 2376 days ago · 10 km deep · 52 km away
  11. 3.6176 km WSW of Nikolski, Alaska · 2377 days ago · 22 km deep · 72 km away
  12. 3.1192 km SW of Nikolski, Alaska · 2381 days ago · 22 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60009bky (also filed as ak02053sizvy). Read Sun, Oct 4, 2026, 8:50 PM UTC.