Alaska earthquakes

M3.6 earthquake 185 km SW of Nikolski, Alaska

A magnitude 3.6 earthquake struck 185 km SW of Nikolski, Alaska on Thu, Apr 23, 2020, 9:22 AM HADT (18:22 UTC), 26 km (16 mi) below the surface.

A larger quake followed: M4.1 208 km SW 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
3.6 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-04-23 18:22:18 UTC
Depth
26.2 km (16.3 mi), shallow
Epicenter
51.755° N, 170.767° 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
3.6mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.125 · 16 stations
3.2ML, 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 6.3 km horizontally, 5.9 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
183°, poorly surrounded by stations
Stations used
58

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 4.1208 km SW of Nikolski, Alaska · 2353 days ago · 10 km deep · 37 km away
  2. 3.0186 km SW of Nikolski, Alaska · 2345 days ago · 37 km deep · 32 km away
  3. 3.7173 km WSW of Nikolski, Alaska · 2340 days ago · 57 km deep · 89 km away
  4. 3.4179 km ESE of Atka, Alaska · 2339 days ago · 39 km deep · 63 km away
  5. 3.4159 km WSW of Nikolski, Alaska · 2337 days ago · 35 km deep · 68 km away
  6. 3.7169 km SSW of Nikolski, Alaska · 2324 days ago · 10 km deep · 94 km away
  7. 3.8136 km WSW of Nikolski, Alaska · 2323 days ago · 54 km deep · 62 km away
  8. 3.3171 km E of Atka, Alaska · 2322 days ago · 16 km deep · 90 km away
  9. 3.5156 km ESE of Atka, Alaska · 2321 days ago · 35 km deep · 84 km away
  10. 3.8149 km SW of Nikolski, Alaska · 2319 days ago · 35 km deep · 36 km away
  11. 3.7198 km SW of Nikolski, Alaska · 2314 days ago · 35 km deep · 31 km away
  12. 3.2218 km SW of Nikolski, Alaska · 2312 days ago · 10 km deep · 34 km away
  13. 2.2170 km WSW of Nikolski, Alaska · 2311 days ago · 24 km deep · 65 km away
  14. 3.7180 km SW of Nikolski, Alaska · 2294 days ago · 35 km deep · 28 km away

Before

  1. 3.6175 km SW of Nikolski, Alaska · 2353 days ago · 27 km deep · 11 km away
  2. 3.9195 km SW of Nikolski, Alaska · 2355 days ago · 19 km deep · 14 km away
  3. 3.7116 km SW of Nikolski, Alaska · 2356 days ago · 35 km deep · 69 km away
  4. 3.1174 km E of Atka, Alaska · 2358 days ago · 35 km deep · 79 km away
  5. 3.6154 km SSW of Nikolski, Alaska · 2361 days ago · 57 km deep · 45 km away
  6. 4.190 km SW of Nikolski, Alaska · 2363 days ago · 35 km deep · 94 km away
  7. 3.6195 km E of Atka, Alaska · 2364 days ago · 35 km deep · 50 km away
  8. 3.1197 km SW of Nikolski, Alaska · 2365 days ago · 35 km deep · 20 km away
  9. 4.1180 km WSW of Nikolski, Alaska · 2368 days ago · 46 km deep · 55 km away
  10. 3.6134 km SW of Nikolski, Alaska · 2374 days ago · 35 km deep · 57 km away
  11. 3.4129 km WSW of Nikolski, Alaska · 2374 days ago · 10 km deep · 78 km away
  12. 3.6176 km WSW of Nikolski, Alaska · 2375 days ago · 22 km deep · 41 km away
  13. 3.1192 km SW of Nikolski, Alaska · 2379 days ago · 22 km deep · 13 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60009aub (also filed as ak02058u44o9). Read Fri, Oct 2, 2026, 7:57 PM UTC.