Alaska earthquakes

M3.4 earthquake 183 km WSW of Nikolski, Alaska

A magnitude 3.4 earthquake struck 183 km WSW of Nikolski, Alaska on Sat, Oct 17, 2020, 4:05 AM HADT (13:05 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.4 177 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
3.4 (ml), minor
Local time
UTC
2020-10-17 13:05:13 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
52.052° N, 171.142° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

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 3.2 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.10
Depth from
Operator assigned
Station coverage gap
209°, poorly surrounded by stations
Stations used
27

Nearby

Within 100 km, magnitude 1.5 and up: 16 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 3.7128 km SW of Nikolski, Alaska · 2172 days ago · 21 km deep · 56 km away
  2. 2.5192 km ESE of Atka, Alaska · 2165 days ago · 37 km deep · 31 km away
  3. 2.9179 km WSW of Nikolski, Alaska · 2162 days ago · 35 km deep · 8 km away
  4. 3.6126 km WSW of Nikolski, Alaska · 2147 days ago · 47 km deep · 57 km away
  5. 2.8120 km WSW of Nikolski, Alaska · 2141 days ago · 25 km deep · 66 km away
  6. 4.4177 km SW of Nikolski, Alaska · 2135 days ago · 35 km deep · 11 km away
  7. 3.2132 km WSW of Nikolski, Alaska · 2128 days ago · 28 km deep · 51 km away
  8. 4.1147 km E of Atka, Alaska · 2128 days ago · 34 km deep · 63 km away
  9. 3.6138 km E of Atka, Alaska · 2128 days ago · 103 km deep · 81 km away
  10. 3.1149 km WSW of Nikolski, Alaska · 2127 days ago · 35 km deep · 34 km away
  11. 4.2172 km SW of Nikolski, Alaska · 2123 days ago · 44 km deep · 14 km away
  12. 3.6169 km WSW of Nikolski, Alaska · 2123 days ago · 40 km deep · 14 km away
  13. 3.7178 km SW of Nikolski, Alaska · 2123 days ago · 40 km deep · 15 km away
  14. 2.9135 km ESE of Atka, Alaska · 2123 days ago · 103 km deep · 92 km away
  15. 3.2142 km ESE of Atka, Alaska · 2122 days ago · 35 km deep · 73 km away
  16. 3.4111 km SW of Nikolski, Alaska · 2122 days ago · 35 km deep · 75 km away

Before

  1. 3.0191 km E of Atka, Alaska · 2177 days ago · 37 km deep · 26 km away
  2. 2.7186 km E of Atka, Alaska · 2179 days ago · 35 km deep · 25 km away
  3. 3.0193 km WSW of Nikolski, Alaska · 2188 days ago · 35 km deep · 14 km away
  4. 4.1118 km SSW of Nikolski, Alaska · 2194 days ago · 26 km deep · 95 km away
  5. 3.5130 km WSW of Nikolski, Alaska · 2194 days ago · 49 km deep · 56 km away
  6. 4.4126 km SSW of Nikolski, Alaska · 2194 days ago · 10 km deep · 98 km away
  7. 3.7131 km SSW of Nikolski, Alaska · 2194 days ago · 10 km deep · 99 km away
  8. 3.1131 km WSW of Nikolski, Alaska · 2196 days ago · 35 km deep · 53 km away
  9. 3.4157 km W of Nikolski, Alaska · 2203 days ago · 219 km deep · 89 km away
  10. 3.0194 km ESE of Atka, Alaska · 2203 days ago · 36 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000cbbz (also filed as ak020ddh5q4b). Read Wed, Sep 30, 2026, 12:24 PM UTC.