Alaska earthquakes

M2.8 earthquake 174 km WSW of Nikolski, Alaska

A magnitude 2.8 earthquake struck 174 km WSW of Nikolski, Alaska on Mon, Nov 15, 2021, 6:43 PM HAST (04:43 UTC), 56 km (35 mi) below the surface.

A larger quake followed: M4.8 171 km W of Nikolski, 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
2.8 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2021-11-16 04:43:58 UTC
Depth
55.9 km (34.7 mi), shallow
Epicenter
52.211° N, 171.145° 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
2.8ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.181 · 4 stations
2.7ML, 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 12.3 km horizontally, 40.2 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
205°, poorly surrounded by stations
Stations used
18

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.083 km SW of Nikolski, Alaska · 1781 days ago · 18 km deep · 98 km away
  2. 2.9122 km W of Nikolski, Alaska · 1780 days ago · 134 km deep · 90 km away
  3. 3.1158 km WSW of Nikolski, Alaska · 1760 days ago · 123 km deep · 32 km away
  4. 3.1170 km WSW of Nikolski, Alaska · 1758 days ago · 17 km deep · 12 km away
  5. 4.0189 km ESE of Atka, Alaska · 1758 days ago · 39 km deep · 56 km away
  6. 3.299 km SW of Nikolski, Alaska · 1753 days ago · 10 km deep · 78 km away
  7. 3.4113 km SW of Nikolski, Alaska · 1745 days ago · 35 km deep · 80 km away
  8. 2.6Fox Islands, Aleutian Islands, Alaska · 1734 days ago · 35 km deep · 86 km away
  9. 4.1142 km ESE of Atka, Alaska · 1728 days ago · 35 km deep · 76 km away
  10. 4.8171 km W of Nikolski, Alaska · 1726 days ago · 122 km deep · 86 km away
  11. 2.693 km SW of Nikolski, Alaska · 1725 days ago · 68 km deep · 84 km away
  12. 2.384 km SW of Nikolski, Alaska · 1725 days ago · 45 km deep · 93 km away
  13. 2.8128 km E of Atka, Alaska · 1724 days ago · 53 km deep · 81 km away
  14. 3.9133 km SW of Nikolski, Alaska · 1723 days ago · 35 km deep · 50 km away

Before

  1. 3.6155 km SW of Nikolski, Alaska · 1790 days ago · 35 km deep · 50 km away
  2. 3.2185 km E of Atka, Alaska · 1794 days ago · 7 km deep · 32 km away
  3. 2.5136 km SW of Nikolski, Alaska · 1799 days ago · 19 km deep · 64 km away
  4. 3.0143 km SW of Nikolski, Alaska · 1803 days ago · 17 km deep · 40 km away
  5. 2.9125 km SW of Nikolski, Alaska · 1804 days ago · 24 km deep · 58 km away
  6. 3.9Fox Islands, Aleutian Islands, Alaska · 1811 days ago · 46 km deep · 65 km away
  7. 3.4180 km WSW of Nikolski, Alaska · 1811 days ago · 21 km deep · 11 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000g94x (also filed as ak021epam4sq). Read Sat, Oct 3, 2026, 7:45 PM UTC.