Alaska earthquakes

M4.1 earthquake 265 km W of Adak, Alaska

A magnitude 4.1 earthquake struck 265 km W of Adak, Alaska on Sat, Feb 13, 2021, 7:46 AM GMT+12 (19:46 UTC), 175 km (109 mi) below the surface.

A larger quake followed: M4.3 Rat Islands, Aleutian Islands, 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
4.1 (mb), light
Local time
UTC
2021-02-12 19:46:40 UTC
Depth
174.9 km (108.7 mi), intermediate-depth
Epicenter
52.113° N, 179.513° E
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 5.8 km horizontally, 12.5 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
189°, poorly surrounded by stations
Stations used
66

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.3Rat Islands, Aleutian Islands, Alaska · 2044 days ago · 89 km deep · 99 km away
  2. 3.0235 km W of Adak, Alaska · 2043 days ago · 172 km deep · 33 km away
  3. 3.1267 km W of Adak, Alaska · 2042 days ago · 35 km deep · 67 km away
  4. 3.8Rat Islands, Aleutian Islands, Alaska · 2039 days ago · 102 km deep · 74 km away
  5. 3.5Rat Islands, Aleutian Islands, Alaska · 2039 days ago · 110 km deep · 87 km away
  6. 3.7255 km W of Adak, Alaska · 2037 days ago · 83 km deep · 58 km away
  7. 2.4220 km W of Adak, Alaska · 2036 days ago · 67 km deep · 48 km away
  8. 3.0Rat Islands, Aleutian Islands, Alaska · 2027 days ago · 18 km deep · 80 km away
  9. 1.7176 km W of Adak, Alaska · 2026 days ago · 14 km deep · 98 km away
  10. 4.3225 km W of Adak, Alaska · 2025 days ago · 158 km deep · 42 km away
  11. 4.3Rat Islands, Aleutian Islands, Alaska · 2018 days ago · 91 km deep · 80 km away
  12. 3.1224 km W of Adak, Alaska · 2015 days ago · 128 km deep · 57 km away
  13. 3.5237 km W of Adak, Alaska · 2011 days ago · 90 km deep · 63 km away
  14. 3.9224 km WSW of Adak, Alaska · 2006 days ago · 51 km deep · 99 km away
  15. 3.8Rat Islands, Aleutian Islands, Alaska · 2003 days ago · 101 km deep · 70 km away
  16. 2.7212 km WSW of Adak, Alaska · 1998 days ago · 113 km deep · 86 km away
  17. 3.3229 km WSW of Adak, Alaska · 1995 days ago · 56 km deep · 79 km away

Before

  1. 3.9Rat Islands, Aleutian Islands, Alaska · 2068 days ago · 79 km deep · 49 km away
  2. 4.0Rat Islands, Aleutian Islands, Alaska · 2070 days ago · 48 km deep · 76 km away
  3. 2.1194 km W of Adak, Alaska · 2074 days ago · 89 km deep · 88 km away
  4. 2.3188 km W of Adak, Alaska · 2074 days ago · 95 km deep · 77 km away
  5. 3.2Rat Islands, Aleutian Islands, Alaska · 2078 days ago · 79 km deep · 94 km away
  6. 4.0195 km WNW of Adak, Alaska · 2079 days ago · 211 km deep · 78 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000djbh. Read Sat, Sep 26, 2026, 1:34 AM UTC.