Alaska earthquakes

M4.8 earthquake 49 km SSW of Nikolski, Alaska

A magnitude 4.8 earthquake struck 49 km SSW of Nikolski, Alaska on Wed, Apr 7, 2021, 11:31 AM AKDT (19:31 UTC), 42 km (26 mi) below the surface.

A larger quake followed: M4.9 128 km WSW of Nikolski, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.8 (mb), light
Local time
UTC
2021-04-07 19:31:57 UTC
Depth
42.0 km (26.1 mi), shallow
Epicenter
52.530° N, 169.148° W
Region
Alaska
Felt reports
4
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

4 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 4.0 km horizontally, 5.7 km in depth
Magnitude uncertainty
±0.03
Depth from
From location
Station coverage gap
127°
Stations used
159

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.8 and up: 21 in the 60 days after this one and 34 in the 30 days before it.

After

  1. 3.976 km SW of Nikolski, Alaska · 2000 days ago · 35 km deep · 31 km away
  2. 3.635 km W of Nikolski, Alaska · 1998 days ago · 143 km deep · 45 km away
  3. 3.4134 km SW of Nikolski, Alaska · 1997 days ago · 22 km deep · 93 km away
  4. 3.191 km SE of Nikolski, Alaska · 1997 days ago · 12 km deep · 88 km away
  5. 2.97 km N of Nikolski, Alaska · 1996 days ago · 70 km deep · 57 km away
  6. 2.5136 km SW of Nikolski, Alaska · 1990 days ago · 35 km deep · 93 km away
  7. 2.865 km SE of Nikolski, Alaska · 1988 days ago · 35 km deep · 74 km away
  8. 3.234 km SSE of Nikolski, Alaska · 1988 days ago · 35 km deep · 31 km away
  9. 2.127 km SSE of Nikolski, Alaska · 1985 days ago · 52 km deep · 32 km away
  10. 2.869 km SE of Nikolski, Alaska · 1981 days ago · 22 km deep · 77 km away
  11. 3.17 km NW of Nikolski, Alaska · 1980 days ago · 80 km deep · 53 km away
  12. 4.9128 km WSW of Nikolski, Alaska · 1973 days ago · 54 km deep · 96 km away
  13. 3.653 km ESE of Nikolski, Alaska · 1972 days ago · 35 km deep · 66 km away
  14. 3.581 km WNW of Nikolski, Alaska · 1969 days ago · 10 km deep · 99 km away
  15. 2.9106 km S of Nikolski, Alaska · 1965 days ago · 35 km deep · 70 km away
  16. 2.240 km ESE of Nikolski, Alaska · 1963 days ago · 30 km deep · 63 km away
  17. 2.955 km SE of Nikolski, Alaska · 1963 days ago · 35 km deep · 60 km away
  18. 2.746 km ESE of Nikolski, Alaska · 1957 days ago · 24 km deep · 74 km away
  19. 3.8100 km SSW of Nikolski, Alaska · 1948 days ago · 34 km deep · 51 km away
  20. 3.6115 km SW of Nikolski, Alaska · 1948 days ago · 22 km deep · 73 km away
  21. 2.637 km ESE of Nikolski, Alaska · 1947 days ago · 34 km deep · 59 km away

Before

  1. 2.244 km ESE of Nikolski, Alaska · 2000 days ago · 55 km deep · 68 km away
  2. 2.130 km S of Nikolski, Alaska · 2000 days ago · 41 km deep · 25 km away
  3. 2.344 km SSW of Nikolski, Alaska · 2001 days ago · 70 km deep · 9 km away
  4. 1.953 km ESE of Nikolski, Alaska · 2002 days ago · 26 km deep · 74 km away
  5. 3.6126 km SSW of Nikolski, Alaska · 2003 days ago · 22 km deep · 77 km away
  6. 2.581 km SW of Nikolski, Alaska · 2003 days ago · 35 km deep · 38 km away
  7. 3.497 km W of Nikolski, Alaska · 2004 days ago · 172 km deep · 96 km away
  8. 2.142 km WSW of Nikolski, Alaska · 2004 days ago · 16 km deep · 30 km away
  9. 3.446 km ESE of Nikolski, Alaska · 2004 days ago · 35 km deep · 65 km away
  10. 2.11 km SSW of Nikolski, Alaska · 2005 days ago · 50 km deep · 48 km away
  11. 3.381 km WSW of Nikolski, Alaska · 2008 days ago · 8 km deep · 67 km away
  12. 3.244 km WSW of Nikolski, Alaska · 2011 days ago · 31 km deep · 33 km away
  13. 2.548 km ESE of Nikolski, Alaska · 2011 days ago · 35 km deep · 70 km away
  14. 3.375 km WSW of Nikolski, Alaska · 2011 days ago · 10 km deep · 62 km away
  15. 3.266 km WSW of Nikolski, Alaska · 2012 days ago · 10 km deep · 50 km away
  16. 2.965 km W of Nikolski, Alaska · 2012 days ago · 10 km deep · 57 km away
  17. 3.568 km W of Nikolski, Alaska · 2012 days ago · 3 km deep · 63 km away
  18. 2.370 km WSW of Nikolski, Alaska · 2012 days ago · 7 km deep · 54 km away
  19. 3.5Fox Islands, Aleutian Islands, Alaska · 2012 days ago · 9 km deep · 69 km away
  20. 3.766 km WSW of Nikolski, Alaska · 2012 days ago · 10 km deep · 56 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000dztq (also filed as ak0214gqmo1h, iscgem620228544). Read Mon, Sep 28, 2026, 6:31 PM UTC.