Alaska earthquakes

M2.5 earthquake 136 km SW of Nikolski, Alaska

A magnitude 2.5 earthquake struck 136 km SW of Nikolski, Alaska on Sat, Apr 17, 2021, 6:10 AM HADT (15:10 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M2.7 178 km WSW of Nikolski, Alaska. This one was a foreshock.

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The earthquake

Magnitude
2.5 (ml), micro
Local time
UTC
2021-04-17 15:10:30 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
52.085° N, 170.299° 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 8.1 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
223°, poorly surrounded by stations
Stations used
15

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 20 in the 30 days before it.

After

  1. 2.7178 km WSW of Nikolski, Alaska · 1985 days ago · 35 km deep · 59 km away
  2. 2.7221 km SW of Nikolski, Alaska · 1985 days ago · 22 km deep · 89 km away
  3. 2.8190 km E of Atka, Alaska · 1985 days ago · 35 km deep · 77 km away
  4. 4.9128 km WSW of Nikolski, Alaska · 1968 days ago · 54 km deep · 40 km away
  5. 3.8189 km ESE of Atka, Alaska · 1959 days ago · 38 km deep · 86 km away
  6. 3.4203 km SSW of Nikolski, Alaska · 1952 days ago · 10 km deep · 76 km away
  7. 3.8154 km SW of Nikolski, Alaska · 1949 days ago · 35 km deep · 18 km away
  8. 3.8100 km SSW of Nikolski, Alaska · 1944 days ago · 34 km deep · 56 km away
  9. 3.6115 km SW of Nikolski, Alaska · 1943 days ago · 22 km deep · 20 km away
  10. 3.3153 km SSW of Nikolski, Alaska · 1932 days ago · 10 km deep · 80 km away
  11. 3.0111 km S of Nikolski, Alaska · 1932 days ago · 136 km deep · 66 km away

Before

  1. 3.0160 km WSW of Nikolski, Alaska · 1987 days ago · 60 km deep · 58 km away
  2. 3.4134 km SW of Nikolski, Alaska · 1992 days ago · 22 km deep · 8 km away
  3. 3.976 km SW of Nikolski, Alaska · 1995 days ago · 35 km deep · 62 km away
  4. 4.849 km SSW of Nikolski, Alaska · 1995 days ago · 42 km deep · 93 km away · felt by 4
  5. 3.6126 km SSW of Nikolski, Alaska · 1998 days ago · 22 km deep · 63 km away
  6. 2.581 km SW of Nikolski, Alaska · 1999 days ago · 35 km deep · 55 km away
  7. 2.142 km WSW of Nikolski, Alaska · 2000 days ago · 16 km deep · 95 km away
  8. 3.381 km WSW of Nikolski, Alaska · 2004 days ago · 8 km deep · 79 km away
  9. 3.244 km WSW of Nikolski, Alaska · 2006 days ago · 31 km deep · 94 km away
  10. 3.375 km WSW of Nikolski, Alaska · 2007 days ago · 10 km deep · 82 km away
  11. 3.266 km WSW of Nikolski, Alaska · 2007 days ago · 10 km deep · 81 km away
  12. 2.965 km W of Nikolski, Alaska · 2007 days ago · 10 km deep · 91 km away
  13. 3.6164 km SW of Nikolski, Alaska · 2007 days ago · 37 km deep · 29 km away
  14. 3.568 km W of Nikolski, Alaska · 2007 days ago · 3 km deep · 94 km away
  15. 2.370 km WSW of Nikolski, Alaska · 2007 days ago · 7 km deep · 79 km away
  16. 3.5Fox Islands, Aleutian Islands, Alaska · 2007 days ago · 9 km deep · 89 km away
  17. 3.766 km WSW of Nikolski, Alaska · 2007 days ago · 10 km deep · 88 km away
  18. 4.872 km WSW of Nikolski, Alaska · 2007 days ago · 12 km deep · 81 km away
  19. 2.9119 km WSW of Nikolski, Alaska · 2009 days ago · 117 km deep · 74 km away
  20. 2.5Fox Islands, Aleutian Islands, Alaska · 2010 days ago · 30 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000e2nd (also filed as ak0214x7hunp). Read Thu, Sep 24, 2026, 1:28 AM UTC.