Alaska earthquakes

M3.7 earthquake 180 km SSE of Adak, Alaska

A magnitude 3.7 earthquake struck 180 km SSE of Adak, Alaska on Mon, Jan 18, 2021, 8:04 AM HAST (18:04 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.9 193 km S of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
3.7 (mb), minor
Local time
UTC
2021-01-18 18:04:18 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.395° N, 175.560° 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 4.8 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.19
Depth from
Operator assigned
Station coverage gap
269°, poorly surrounded by stations
Stations used
32

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 2.1140 km SE of Adak, Alaska · 2072 days ago · 18 km deep · 54 km away
  2. 2.896 km SSE of Adak, Alaska · 2068 days ago · 10 km deep · 86 km away
  3. 2.8193 km S of Adak, Alaska · 2061 days ago · 10 km deep · 88 km away
  4. 3.9193 km S of Atka, Alaska · 2060 days ago · 10 km deep · 67 km away
  5. 3.784 km SSE of Adak, Alaska · 2056 days ago · 37 km deep · 97 km away
  6. 3.598 km SSE of Adak, Alaska · 2056 days ago · 10 km deep · 85 km away
  7. 2.599 km SSE of Adak, Alaska · 2055 days ago · 20 km deep · 82 km away
  8. 2.8208 km SSW of Atka, Alaska · 2047 days ago · 10 km deep · 52 km away
  9. 2.2162 km SE of Adak, Alaska · 2046 days ago · 5 km deep · 53 km away
  10. 2.5165 km SSE of Adak, Alaska · 2024 days ago · 10 km deep · 38 km away
  11. 2.6181 km S of Atka, Alaska · 2019 days ago · 25 km deep · 64 km away

Before

  1. 4.0189 km S of Adak, Alaska · 2095 days ago · 10 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000dd17 (also filed as ak021u2ezbp). Read Fri, Sep 25, 2026, 11:21 AM UTC.