Alaska earthquakes

M4.1 earthquake 208 km SW of Nikolski, Alaska

A magnitude 4.1 earthquake struck 208 km SW of Nikolski, Alaska on Thu, Apr 23, 2020, 9:52 AM HADT (18:52 UTC), 10 km (6 mi) below the surface.

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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
4.1 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-04-23 18:52:31 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
51.425° N, 170.653° 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
4.1mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.044 · 142 stations
3.7ML, 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 5.0 km horizontally, 1.8 km in depth
Magnitude uncertainty
±0.04
Depth from
Operator assigned
Station coverage gap
92°
Stations used
84

Nearby

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 3.0186 km SW of Nikolski, Alaska · 2346 days ago · 37 km deep · 67 km away
  2. 3.4179 km ESE of Atka, Alaska · 2341 days ago · 39 km deep · 81 km away
  3. 3.7169 km SSW of Nikolski, Alaska · 2325 days ago · 10 km deep · 81 km away
  4. 3.8136 km WSW of Nikolski, Alaska · 2325 days ago · 54 km deep · 98 km away
  5. 3.8149 km SW of Nikolski, Alaska · 2320 days ago · 35 km deep · 62 km away
  6. 3.7198 km SW of Nikolski, Alaska · 2316 days ago · 35 km deep · 61 km away
  7. 3.2218 km SW of Nikolski, Alaska · 2314 days ago · 10 km deep · 39 km away
  8. 3.7180 km SW of Nikolski, Alaska · 2295 days ago · 35 km deep · 27 km away

Before

  1. 3.6185 km SW of Nikolski, Alaska · 2355 days ago · 26 km deep · 37 km away
  2. 3.6175 km SW of Nikolski, Alaska · 2355 days ago · 27 km deep · 48 km away
  3. 3.9195 km SW of Nikolski, Alaska · 2357 days ago · 19 km deep · 25 km away
  4. 3.7116 km SW of Nikolski, Alaska · 2358 days ago · 35 km deep · 93 km away
  5. 3.6154 km SSW of Nikolski, Alaska · 2363 days ago · 57 km deep · 55 km away
  6. 3.6195 km E of Atka, Alaska · 2365 days ago · 35 km deep · 81 km away
  7. 3.1197 km SW of Nikolski, Alaska · 2366 days ago · 35 km deep · 48 km away
  8. 4.1180 km WSW of Nikolski, Alaska · 2369 days ago · 46 km deep · 91 km away
  9. 3.6134 km SW of Nikolski, Alaska · 2375 days ago · 35 km deep · 91 km away
  10. 3.6176 km WSW of Nikolski, Alaska · 2376 days ago · 22 km deep · 78 km away
  11. 3.1192 km SW of Nikolski, Alaska · 2381 days ago · 22 km deep · 24 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60009av6 (also filed as ak02058ualqq). Read Sun, Oct 4, 2026, 8:57 AM UTC.