Alaska earthquakes

M3.5 earthquake 137 km SW of Nikolski, Alaska

A magnitude 3.5 earthquake struck 137 km SW of Nikolski, Alaska on Wed, Jul 15, 2020, 12:01 PM HADT (21:01 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.9 113 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
3.5 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-07-15 21:01:03 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
52.139° N, 170.413° 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
3.5mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.164 · 9 stations
3.3ML, 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
±0.16
Depth from
Operator assigned
Station coverage gap
139°
Stations used
46

Nearby

Within 100 km, magnitude 1.5 and up: 39 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 3.066 km WSW of Nikolski, Alaska · 2270 days ago · 95 km deep · 83 km away
  2. 3.1181 km ESE of Atka, Alaska · 2268 days ago · 35 km deep · 95 km away
  3. 2.3147 km WSW of Nikolski, Alaska · 2268 days ago · 71 km deep · 33 km away
  4. 3.2210 km ESE of Atka, Alaska · 2265 days ago · 26 km deep · 74 km away
  5. 2.059 km SW of Nikolski, Alaska · 2262 days ago · 15 km deep · 78 km away
  6. 2.255 km SW of Nikolski, Alaska · 2262 days ago · 11 km deep · 82 km away
  7. 3.2181 km E of Atka, Alaska · 2261 days ago · 118 km deep · 87 km away
  8. 2.6126 km SSW of Nikolski, Alaska · 2260 days ago · 23 km deep · 79 km away
  9. 2.778 km W of Nikolski, Alaska · 2259 days ago · 145 km deep · 98 km away
  10. 3.1133 km WSW of Nikolski, Alaska · 2257 days ago · 22 km deep · 19 km away
  11. 3.6108 km SSW of Nikolski, Alaska · 2256 days ago · 10 km deep · 74 km away
  12. 2.949 km SW of Nikolski, Alaska · 2252 days ago · 17 km deep · 88 km away
  13. 1.849 km WSW of Nikolski, Alaska · 2252 days ago · 18 km deep · 92 km away
  14. 4.0107 km SW of Nikolski, Alaska · 2251 days ago · 35 km deep · 31 km away
  15. 3.778 km SW of Nikolski, Alaska · 2246 days ago · 44 km deep · 64 km away
  16. 3.0171 km W of Nikolski, Alaska · 2243 days ago · 135 km deep · 94 km away
  17. 2.393 km SSW of Nikolski, Alaska · 2240 days ago · 16 km deep · 57 km away
  18. 2.9206 km ESE of Atka, Alaska · 2239 days ago · 10 km deep · 73 km away
  19. 3.3193 km ESE of Atka, Alaska · 2239 days ago · 25 km deep · 75 km away
  20. 4.3214 km ESE of Atka, Alaska · 2239 days ago · 10 km deep · 85 km away
  21. 3.3212 km ESE of Atka, Alaska · 2239 days ago · 26 km deep · 76 km away
  22. 3.8201 km E of Atka, Alaska · 2239 days ago · 35 km deep · 68 km away
  23. 3.6201 km SW of Nikolski, Alaska · 2239 days ago · 33 km deep · 64 km away
  24. 3.7212 km ESE of Atka, Alaska · 2239 days ago · 33 km deep · 77 km away
  25. 3.9214 km SW of Nikolski, Alaska · 2239 days ago · 10 km deep · 76 km away
  26. 3.1232 km SW of Nikolski, Alaska · 2238 days ago · 10 km deep · 98 km away
  27. 3.8224 km ESE of Atka, Alaska · 2238 days ago · 10 km deep · 90 km away
  28. 3.6196 km SW of Nikolski, Alaska · 2237 days ago · 23 km deep · 60 km away
  29. 3.4200 km SW of Nikolski, Alaska · 2237 days ago · 20 km deep · 62 km away
  30. 2.8207 km SW of Nikolski, Alaska · 2235 days ago · 10 km deep · 76 km away
  31. 1.990 km SW of Nikolski, Alaska · 2234 days ago · 52 km deep · 48 km away
  32. 3.3108 km SW of Nikolski, Alaska · 2234 days ago · 35 km deep · 30 km away
  33. 4.9113 km SSW of Nikolski, Alaska · 2232 days ago · 18 km deep · 64 km away
  34. 3.0114 km SSW of Nikolski, Alaska · 2231 days ago · 10 km deep · 73 km away
  35. 3.0129 km SSW of Nikolski, Alaska · 2230 days ago · 10 km deep · 43 km away
  36. 3.8183 km ESE of Atka, Alaska · 2224 days ago · 37 km deep · 86 km away
  37. 2.6134 km SW of Nikolski, Alaska · 2220 days ago · 33 km deep · 9 km away
  38. 1.744 km WSW of Nikolski, Alaska · 2220 days ago · 23 km deep · 95 km away
  39. 1.876 km SW of Nikolski, Alaska · 2212 days ago · 32 km deep · 65 km away

Before

  1. 2.2154 km WSW of Nikolski, Alaska · 2271 days ago · 65 km deep · 51 km away
  2. 4.6103 km SSW of Nikolski, Alaska · 2274 days ago · 21 km deep · 65 km away
  3. 3.176 km SW of Nikolski, Alaska · 2276 days ago · 27 km deep · 63 km away
  4. 3.2100 km SSW of Nikolski, Alaska · 2276 days ago · 10 km deep · 60 km away
  5. 3.0209 km SSW of Nikolski, Alaska · 2280 days ago · 10 km deep · 88 km away
  6. 3.388 km SSW of Nikolski, Alaska · 2285 days ago · 10 km deep · 70 km away
  7. 3.593 km WSW of Nikolski, Alaska · 2289 days ago · 10 km deep · 69 km away
  8. 4.5184 km E of Atka, Alaska · 2291 days ago · 57 km deep · 79 km away
  9. 1.843 km SW of Nikolski, Alaska · 2292 days ago · 71 km deep · 94 km away
  10. 3.7180 km SW of Nikolski, Alaska · 2294 days ago · 35 km deep · 58 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000b205 (also filed as ak020925dp2o). Read Fri, Oct 2, 2026, 9:08 PM UTC.