Alaska earthquakes

M2.9 earthquake 250 km ESE of Atka, Alaska

A magnitude 2.9 earthquake struck 250 km ESE of Atka, Alaska on Sun, Aug 16, 2020, 11:23 AM HADT (20:23 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.8 224 km ESE 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), micro
Local time
UTC
2020-08-16 20:23:29 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
51.008° N, 171.129° 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 6.7 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
228°, poorly surrounded by stations
Stations used
7

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 3.1232 km SW of Nikolski, Alaska · 2235 days ago · 10 km deep · 39 km away
  2. 3.8224 km ESE of Atka, Alaska · 2235 days ago · 10 km deep · 52 km away
  3. 3.4206 km ESE of Atka, Alaska · 2235 days ago · 21 km deep · 53 km away
  4. 3.6196 km SW of Nikolski, Alaska · 2234 days ago · 23 km deep · 95 km away
  5. 3.4200 km SW of Nikolski, Alaska · 2234 days ago · 20 km deep · 85 km away
  6. 2.8207 km SW of Nikolski, Alaska · 2232 days ago · 10 km deep · 59 km away
  7. 3.8183 km ESE of Atka, Alaska · 2221 days ago · 37 km deep · 99 km away
  8. 3.0209 km SW of Nikolski, Alaska · 2206 days ago · 36 km deep · 78 km away
  9. 2.9170 km SW of Nikolski, Alaska · 2205 days ago · 10 km deep · 96 km away
  10. 3.1200 km SE of Atka, Alaska · 2204 days ago · 10 km deep · 52 km away
  11. 3.0194 km ESE of Atka, Alaska · 2202 days ago · 36 km deep · 91 km away
  12. 3.2218 km SSW of Nikolski, Alaska · 2196 days ago · 10 km deep · 86 km away

Before

  1. 5.8241 km ESE of Atka, Alaska · 2235 days ago · 18 km deep · 23 km away · felt by 1 · tsunami flag
  2. 3.9214 km SW of Nikolski, Alaska · 2236 days ago · 10 km deep · 72 km away
  3. 3.7212 km ESE of Atka, Alaska · 2236 days ago · 33 km deep · 73 km away
  4. 3.6201 km SW of Nikolski, Alaska · 2236 days ago · 33 km deep · 91 km away
  5. 3.8201 km E of Atka, Alaska · 2236 days ago · 35 km deep · 98 km away
  6. 3.3212 km ESE of Atka, Alaska · 2236 days ago · 26 km deep · 75 km away
  7. 4.3214 km ESE of Atka, Alaska · 2236 days ago · 10 km deep · 64 km away
  8. 3.3193 km ESE of Atka, Alaska · 2236 days ago · 25 km deep · 98 km away
  9. 2.9206 km ESE of Atka, Alaska · 2236 days ago · 10 km deep · 85 km away
  10. 3.0235 km ESE of Atka, Alaska · 2236 days ago · 10 km deep · 34 km away
  11. 2.9276 km SSW of Nikolski, Alaska · 2255 days ago · 10 km deep · 76 km away
  12. 3.2210 km ESE of Atka, Alaska · 2262 days ago · 26 km deep · 79 km away
  13. 3.1181 km ESE of Atka, Alaska · 2265 days ago · 35 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000bibc. Read Tue, Sep 29, 2026, 10:08 PM UTC.