Alaska earthquakes

M2.9 earthquake 135 km ESE of Atka, Alaska

A magnitude 2.9 earthquake struck 135 km ESE of Atka, Alaska on Mon, Aug 17, 2020, 2:35 PM HADT (23:35 UTC), 140 km (87 mi) below the surface.

A larger quake followed: M3.9 45 km SE of Atka, 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
2.9 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-08-17 23:35:48 UTC
Depth
140.3 km (87.2 mi), intermediate-depth
Epicenter
51.636° N, 172.454° 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
2.9ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.128 · 8 stations
2.6ML, 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 9.4 km horizontally, 27.7 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
220°, poorly surrounded by stations
Stations used
22

Nearby

Within 100 km, magnitude 1.5 and up: 32 in the 60 days after this one and 38 in the 30 days before it.

After

  1. 1.869 km SE of Atka, Alaska · 2238 days ago · 23 km deep · 70 km away
  2. 1.9129 km SE of Atka, Alaska · 2237 days ago · 21 km deep · 38 km away
  3. 1.6116 km ESE of Atka, Alaska · 2236 days ago · 49 km deep · 30 km away
  4. 2.5147 km ESE of Atka, Alaska · 2236 days ago · 35 km deep · 28 km away
  5. 1.564 km SSE of Atka, Alaska · 2236 days ago · 3 km deep · 98 km away
  6. 1.885 km SE of Atka, Alaska · 2234 days ago · 13 km deep · 52 km away
  7. 2.668 km SSE of Atka, Alaska · 2233 days ago · 28 km deep · 91 km away
  8. 3.8183 km ESE of Atka, Alaska · 2226 days ago · 37 km deep · 65 km away
  9. 2.655 km SE of Atka, Alaska · 2222 days ago · 74 km deep · 85 km away
  10. 1.849 km SE of Atka, Alaska · 2216 days ago · 82 km deep · 91 km away
  11. 2.942 km SE of Atka, Alaska · 2212 days ago · 98 km deep · 98 km away
  12. 1.955 km ESE of Atka, Alaska · 2212 days ago · 69 km deep · 81 km away
  13. 2.940 km ESE of Atka, Alaska · 2211 days ago · 10 km deep · 96 km away
  14. 3.0209 km SW of Nikolski, Alaska · 2211 days ago · 36 km deep · 88 km away
  15. 3.1200 km SE of Atka, Alaska · 2209 days ago · 10 km deep · 69 km away
  16. 3.0194 km ESE of Atka, Alaska · 2207 days ago · 36 km deep · 72 km away
  17. 2.2Andreanof Islands, Aleutian Islands, Alaska · 2207 days ago · 31 km deep · 70 km away
  18. 1.756 km SE of Atka, Alaska · 2206 days ago · 43 km deep · 83 km away
  19. 2.9116 km ESE of Atka, Alaska · 2206 days ago · 35 km deep · 21 km away
  20. 3.385 km SE of Atka, Alaska · 2203 days ago · 35 km deep · 52 km away
  21. 2.967 km ESE of Atka, Alaska · 2202 days ago · 71 km deep · 69 km away
  22. 1.787 km SSE of Atka, AK · 2200 days ago · 39 km deep · 85 km away
  23. 1.775 km SE of Atka, Alaska · 2200 days ago · 1 km deep · 61 km away
  24. 2.147 km ESE of Atka, Alaska · 2196 days ago · 85 km deep · 90 km away
  25. 3.6100 km E of Atka, Alaska · 2195 days ago · 151 km deep · 83 km away
  26. 3.0193 km WSW of Nikolski, Alaska · 2193 days ago · 35 km deep · 91 km away
  27. 1.962 km ESE of Atka, Alaska · 2190 days ago · 53 km deep · 73 km away
  28. 3.539 km ESE of Atka, Alaska · 2188 days ago · 14 km deep · 97 km away
  29. 2.154 km ESE of Atka, Alaska · 2185 days ago · 53 km deep · 81 km away
  30. 2.7186 km E of Atka, Alaska · 2184 days ago · 35 km deep · 77 km away
  31. 3.945 km SE of Atka, Alaska · 2184 days ago · 20 km deep · 92 km away
  32. 3.0191 km E of Atka, Alaska · 2182 days ago · 37 km deep · 76 km away

Before

  1. 3.4200 km SW of Nikolski, Alaska · 2239 days ago · 20 km deep · 95 km away
  2. 3.6196 km SW of Nikolski, Alaska · 2239 days ago · 23 km deep · 93 km away
  3. 3.1132 km E of Atka, Alaska · 2239 days ago · 99 km deep · 57 km away
  4. 3.4206 km ESE of Atka, Alaska · 2240 days ago · 21 km deep · 72 km away
  5. 3.8224 km ESE of Atka, Alaska · 2240 days ago · 10 km deep · 92 km away
  6. 3.1232 km SW of Nikolski, Alaska · 2240 days ago · 10 km deep · 100 km away
  7. 3.9214 km SW of Nikolski, Alaska · 2241 days ago · 10 km deep · 86 km away
  8. 3.7212 km ESE of Atka, Alaska · 2241 days ago · 33 km deep · 85 km away
  9. 3.6201 km SW of Nikolski, Alaska · 2241 days ago · 33 km deep · 89 km away
  10. 3.8201 km E of Atka, Alaska · 2241 days ago · 35 km deep · 83 km away
  11. 3.3212 km ESE of Atka, Alaska · 2241 days ago · 26 km deep · 85 km away
  12. 4.3214 km ESE of Atka, Alaska · 2241 days ago · 10 km deep · 83 km away
  13. 3.3193 km ESE of Atka, Alaska · 2241 days ago · 25 km deep · 76 km away
  14. 2.9206 km ESE of Atka, Alaska · 2241 days ago · 10 km deep · 82 km away
  15. 1.8140 km ESE of Atka, Alaska · 2242 days ago · 56 km deep · 14 km away
  16. 3.0134 km ENE of Atka, Alaska · 2244 days ago · 138 km deep · 92 km away
  17. 1.954 km ESE of Atka, Alaska · 2245 days ago · 73 km deep · 81 km away
  18. 1.965 km SE of Atka, Alaska · 2245 days ago · 30 km deep · 74 km away
  19. 2.6123 km ESE of Atka, Alaska · 2247 days ago · 35 km deep · 15 km away
  20. 1.776 km ESE of Atka, Alaska · 2249 days ago · 35 km deep · 58 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000bhpe (also filed as ak020akriip1). Read Sun, Oct 4, 2026, 9:39 PM UTC.