Alaska earthquakes

M2.5 earthquake 192 km ESE of Atka, Alaska

A magnitude 2.5 earthquake struck 192 km ESE of Atka, Alaska on Mon, Oct 26, 2020, 1:37 AM HADT (10:37 UTC), 37 km (23 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
2.5 (ml), micro
Local time
UTC
2020-10-26 10:37:34 UTC
Depth
36.7 km (22.8 mi), shallow
Epicenter
51.847° N, 171.452° 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 9.8 km horizontally, 24.1 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
221°, poorly surrounded by stations
Stations used
16

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.9179 km WSW of Nikolski, Alaska · 2160 days ago · 35 km deep · 37 km away
  2. 3.6126 km WSW of Nikolski, Alaska · 2146 days ago · 47 km deep · 88 km away
  3. 3.2112 km ESE of Atka, Alaska · 2144 days ago · 35 km deep · 83 km away
  4. 2.8120 km WSW of Nikolski, Alaska · 2140 days ago · 25 km deep · 97 km away
  5. 2.9106 km ESE of Atka, Alaska · 2138 days ago · 19 km deep · 91 km away
  6. 4.4177 km SW of Nikolski, Alaska · 2133 days ago · 35 km deep · 37 km away
  7. 3.2132 km WSW of Nikolski, Alaska · 2127 days ago · 28 km deep · 81 km away
  8. 4.1147 km E of Atka, Alaska · 2126 days ago · 34 km deep · 47 km away
  9. 3.6138 km E of Atka, Alaska · 2126 days ago · 103 km deep · 79 km away
  10. 3.1149 km WSW of Nikolski, Alaska · 2126 days ago · 35 km deep · 65 km away
  11. 4.2172 km SW of Nikolski, Alaska · 2122 days ago · 44 km deep · 42 km away
  12. 3.6169 km WSW of Nikolski, Alaska · 2122 days ago · 40 km deep · 45 km away
  13. 3.7178 km SW of Nikolski, Alaska · 2122 days ago · 40 km deep · 37 km away
  14. 2.9135 km ESE of Atka, Alaska · 2122 days ago · 103 km deep · 65 km away
  15. 3.2142 km ESE of Atka, Alaska · 2121 days ago · 35 km deep · 50 km away
  16. 4.2127 km WSW of Nikolski, Alaska · 2109 days ago · 53 km deep · 88 km away
  17. 3.6213 km ESE of Atka, Alaska · 2109 days ago · 25 km deep · 26 km away
  18. 4.0158 km SW of Nikolski, Alaska · 2108 days ago · 41 km deep · 72 km away

Before

  1. 3.7128 km SW of Nikolski, Alaska · 2171 days ago · 21 km deep · 86 km away
  2. 3.4183 km WSW of Nikolski, Alaska · 2173 days ago · 35 km deep · 31 km away
  3. 3.0191 km E of Atka, Alaska · 2176 days ago · 37 km deep · 8 km away
  4. 2.7186 km E of Atka, Alaska · 2178 days ago · 35 km deep · 16 km away
  5. 3.0193 km WSW of Nikolski, Alaska · 2187 days ago · 35 km deep · 27 km away
  6. 3.5130 km WSW of Nikolski, Alaska · 2193 days ago · 49 km deep · 87 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000cals (also filed as ak020dsbegcs). Read Tue, Sep 29, 2026, 1:10 AM UTC.