Alaska earthquakes

M4.0 earthquake 195 km WNW of Adak, Alaska

A magnitude 4.0 earthquake struck 195 km WNW of Adak, Alaska on Fri, Jan 15, 2021, 8:10 PM HAST (06:10 UTC), 211 km (131 mi) below the surface.

A larger quake followed: M4.8 184 km WSW of Adak, 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
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2021-01-16 06:10:31 UTC
Depth
211.0 km (131.1 mi), intermediate-depth
Epicenter
52.309° N, 179.390° 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
4.0mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.116 · 20 stations
3.6ML, 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 8.6 km horizontally, 10.7 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
151°
Stations used
51

Nearby

Within 100 km, magnitude 1.5 and up: 21 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.8172 km W of Adak, Alaska · 2083 days ago · 11 km deep · 70 km away
  2. 2.3188 km W of Adak, Alaska · 2081 days ago · 95 km deep · 31 km away
  3. 2.1194 km W of Adak, Alaska · 2081 days ago · 89 km deep · 71 km away
  4. 1.9131 km W of Adak, Alaska · 2079 days ago · 94 km deep · 88 km away
  5. 2.1162 km W of Adak, Alaska · 2079 days ago · 92 km deep · 77 km away
  6. 2.1131 km W of Adak, Alaska · 2072 days ago · 115 km deep · 83 km away
  7. 1.9178 km WSW of Adak, Alaska · 2069 days ago · 1 km deep · 87 km away
  8. 4.1265 km W of Adak, Alaska · 2058 days ago · 175 km deep · 78 km away
  9. 4.8184 km WSW of Adak, Alaska · 2056 days ago · 23 km deep · 97 km away
  10. 3.5173 km WSW of Adak, Alaska · 2056 days ago · 10 km deep · 88 km away
  11. 3.0235 km W of Adak, Alaska · 2050 days ago · 172 km deep · 45 km away
  12. 1.9170 km W of Adak, Alaska · 2048 days ago · 5 km deep · 64 km away
  13. 1.8128 km WSW of Adak, Alaska · 2044 days ago · 13 km deep · 99 km away
  14. 2.4220 km W of Adak, Alaska · 2043 days ago · 67 km deep · 48 km away
  15. 2.0119 km W of Adak, Alaska · 2034 days ago · 9 km deep · 85 km away
  16. 1.6117 km W of Adak, Alaska · 2034 days ago · 15 km deep · 90 km away
  17. 1.7176 km W of Adak, Alaska · 2032 days ago · 14 km deep · 63 km away
  18. 3.3190 km WSW of Adak, Alaska · 2032 days ago · 68 km deep · 89 km away
  19. 4.3225 km W of Adak, Alaska · 2032 days ago · 158 km deep · 51 km away
  20. 1.5133 km W of Adak, Alaska · 2031 days ago · 7 km deep · 92 km away
  21. 1.9130 km WSW of Adak, Alaska · 2026 days ago · 58 km deep · 99 km away

Before

  1. 1.9185 km WSW of Adak, Alaska · 2096 days ago · 12 km deep · 100 km away
  2. 2.1176 km WSW of Adak, Alaska · 2097 days ago · 76 km deep · 89 km away
  3. 3.7230 km W of Adak, Alaska · 2098 days ago · 6 km deep · 76 km away
  4. 4.1204 km WSW of Adak, Alaska · 2101 days ago · 35 km deep · 96 km away
  5. 2.7112 km W of Adak, Alaska · 2111 days ago · 107 km deep · 97 km away
  6. 1.9152 km WSW of Adak, Alaska · 2111 days ago · 11 km deep · 99 km away
  7. 1.7156 km WSW of Adak, Alaska · 2112 days ago · 14 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000d359 (also filed as ak021qk8d6w). Read Sat, Oct 3, 2026, 12:56 AM UTC.