Alaska earthquakes

M4.9 earthquake 128 km WSW of Nikolski, Alaska

A magnitude 4.9 earthquake struck 128 km WSW of Nikolski, Alaska on Tue, May 4, 2021, 7:47 AM HADT (16:47 UTC), 54 km (33 mi) below the surface.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
2021-05-04 16:47:43 UTC
Depth
53.5 km (33.2 mi), shallow
Epicenter
52.408° N, 170.544° 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 6.5 km horizontally, 5.9 km in depth
Magnitude uncertainty
±0.03
Depth from
From location
Station coverage gap
124°
Stations used
110

Nearby

Within 100 km, magnitude 1.9 and up: 12 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 3.8189 km ESE of Atka, Alaska · 1960 days ago · 38 km deep · 90 km away
  2. 3.2163 km E of Atka, Alaska · 1955 days ago · 28 km deep · 92 km away
  3. 3.8154 km SW of Nikolski, Alaska · 1950 days ago · 35 km deep · 47 km away
  4. 3.8100 km SSW of Nikolski, Alaska · 1944 days ago · 34 km deep · 79 km away
  5. 3.6115 km SW of Nikolski, Alaska · 1944 days ago · 22 km deep · 39 km away
  6. 3.8123 km W of Nikolski, Alaska · 1938 days ago · 111 km deep · 81 km away
  7. 3.0111 km S of Nikolski, Alaska · 1932 days ago · 136 km deep · 44 km away
  8. 3.244 km W of Nikolski, Alaska · 1926 days ago · 10 km deep · 87 km away
  9. 2.147 km WSW of Nikolski, Alaska · 1914 days ago · 7 km deep · 81 km away
  10. 2.094 km SSW of Nikolski, Alaska · 1914 days ago · 49 km deep · 93 km away
  11. 3.375 km SW of Nikolski, Alaska · 1910 days ago · 34 km deep · 56 km away
  12. 1.946 km WSW of Nikolski, Alaska · 1909 days ago · 7 km deep · 83 km away

Before

  1. 2.8190 km E of Atka, Alaska · 1986 days ago · 35 km deep · 72 km away
  2. 2.7178 km WSW of Nikolski, Alaska · 1986 days ago · 35 km deep · 51 km away
  3. 2.5136 km SW of Nikolski, Alaska · 1986 days ago · 35 km deep · 40 km away
  4. 3.0160 km WSW of Nikolski, Alaska · 1987 days ago · 60 km deep · 34 km away
  5. 3.4134 km SW of Nikolski, Alaska · 1993 days ago · 22 km deep · 32 km away
  6. 3.635 km W of Nikolski, Alaska · 1994 days ago · 143 km deep · 95 km away
  7. 3.976 km SW of Nikolski, Alaska · 1995 days ago · 35 km deep · 68 km away
  8. 4.849 km SSW of Nikolski, Alaska · 1996 days ago · 42 km deep · 96 km away · felt by 4
  9. 3.6126 km SSW of Nikolski, Alaska · 1999 days ago · 22 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000e01a (also filed as ak0215pcg4tq, iscgem620352099). Read Thu, Sep 24, 2026, 1:07 PM UTC.