Alaska earthquakes

M2.7 earthquake 186 km E of Atka, Alaska

A magnitude 2.7 earthquake struck 186 km E of Atka, Alaska on Sun, Oct 11, 2020, 8:17 PM HADT (05:17 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
2.7 (ml), micro
Local time
UTC
2020-10-12 05:17:29 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.991° N, 171.498° 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 8.4 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
213°, poorly surrounded by stations
Stations used
18

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 3.0191 km E of Atka, Alaska · 2175 days ago · 37 km deep · 9 km away
  2. 3.4183 km WSW of Nikolski, Alaska · 2172 days ago · 35 km deep · 25 km away
  3. 3.7128 km SW of Nikolski, Alaska · 2170 days ago · 21 km deep · 81 km away
  4. 2.5192 km ESE of Atka, Alaska · 2163 days ago · 37 km deep · 16 km away
  5. 2.9179 km WSW of Nikolski, Alaska · 2160 days ago · 35 km deep · 28 km away
  6. 4.3130 km ENE of Atka, Alaska · 2148 days ago · 138 km deep · 95 km away
  7. 3.6126 km WSW of Nikolski, Alaska · 2145 days ago · 47 km deep · 81 km away
  8. 3.2112 km ESE of Atka, Alaska · 2144 days ago · 35 km deep · 81 km away
  9. 2.8120 km WSW of Nikolski, Alaska · 2139 days ago · 25 km deep · 88 km away
  10. 2.9106 km ESE of Atka, Alaska · 2138 days ago · 19 km deep · 90 km away
  11. 4.4177 km SW of Nikolski, Alaska · 2133 days ago · 35 km deep · 35 km away
  12. 3.2132 km WSW of Nikolski, Alaska · 2126 days ago · 28 km deep · 75 km away
  13. 4.1147 km E of Atka, Alaska · 2126 days ago · 34 km deep · 39 km away
  14. 3.6138 km E of Atka, Alaska · 2126 days ago · 103 km deep · 65 km away
  15. 3.1149 km WSW of Nikolski, Alaska · 2125 days ago · 35 km deep · 59 km away
  16. 4.2172 km SW of Nikolski, Alaska · 2121 days ago · 44 km deep · 39 km away
  17. 3.6169 km WSW of Nikolski, Alaska · 2121 days ago · 40 km deep · 39 km away
  18. 3.7178 km SW of Nikolski, Alaska · 2121 days ago · 40 km deep · 37 km away
  19. 2.9135 km ESE of Atka, Alaska · 2121 days ago · 103 km deep · 67 km away
  20. 3.2142 km ESE of Atka, Alaska · 2120 days ago · 35 km deep · 48 km away

Before

  1. 3.0193 km WSW of Nikolski, Alaska · 2186 days ago · 35 km deep · 15 km away
  2. 3.6100 km E of Atka, Alaska · 2188 days ago · 151 km deep · 95 km away
  3. 3.5130 km WSW of Nikolski, Alaska · 2192 days ago · 49 km deep · 78 km away
  4. 3.1131 km WSW of Nikolski, Alaska · 2194 days ago · 35 km deep · 76 km away
  5. 2.9116 km ESE of Atka, Alaska · 2200 days ago · 35 km deep · 94 km away
  6. 3.4157 km W of Nikolski, Alaska · 2200 days ago · 219 km deep · 98 km away
  7. 3.0194 km ESE of Atka, Alaska · 2201 days ago · 36 km deep · 21 km away
  8. 3.1200 km SE of Atka, Alaska · 2202 days ago · 10 km deep · 95 km away
  9. 2.9170 km SW of Nikolski, Alaska · 2204 days ago · 10 km deep · 76 km away
  10. 3.0209 km SW of Nikolski, Alaska · 2204 days ago · 36 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000cd78 (also filed as ak020d52s4oi). Read Mon, Sep 28, 2026, 10:09 AM UTC.