Alaska earthquakes

M1.9 earthquake 241 km S of Adak, Alaska

A magnitude 1.9 earthquake struck 241 km S of Adak, Alaska on Thu, Aug 19, 2021, 11:03 AM HADT (20:03 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M4.5 161 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
1.9 (ml), micro
Local time
UTC
2021-08-19 20:03:59 UTC
Depth
11.9 km (7.4 mi), shallow
Epicenter
49.728° N, 177.111° 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.

Stations used
26

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.7209 km S of Adak, Alaska · 1862 days ago · 21 km deep · 32 km away
  2. 3.4200 km SSW of Adak, Alaska · 1862 days ago · 10 km deep · 44 km away
  3. 2.1186 km SSW of Adak, Alaska · 1860 days ago · 26 km deep · 79 km away
  4. 2.0183 km S of Adak, Alaska · 1851 days ago · 25 km deep · 58 km away
  5. 4.5161 km S of Adak, Alaska · 1835 days ago · 10 km deep · 99 km away
  6. 2.4163 km S of Adak, Alaska · 1835 days ago · 24 km deep · 98 km away
  7. 3.4204 km SSW of Adak, Alaska · 1835 days ago · 10 km deep · 86 km away
  8. 3.1164 km S of Adak, Alaska · 1834 days ago · 10 km deep · 98 km away
  9. 3.1Andreanof Islands, Aleutian Islands, Alaska · 1825 days ago · 10 km deep · 79 km away
  10. 3.7187 km S of Adak, Alaska · 1813 days ago · 10 km deep · 76 km away

Before

  1. 3.2198 km S of Adak, Alaska · 1867 days ago · 10 km deep · 45 km away
  2. 2.1226 km SSW of Adak, Alaska · 1876 days ago · 20 km deep · 62 km away
  3. 1.9180 km S of Adak, Alaska · 1877 days ago · 24 km deep · 85 km away
  4. 1.9211 km SSW of Adak, Alaska · 1882 days ago · 26 km deep · 98 km away
  5. 1.8164 km S of Adak, Alaska · 1885 days ago · 17 km deep · 77 km away
  6. 3.4219 km SSW of Adak, Alaska · 1886 days ago · 43 km deep · 47 km away
  7. 1.9170 km SSW of Adak, Alaska · 1888 days ago · 26 km deep · 74 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021amd2lxm. Read Thu, Sep 24, 2026, 3:13 PM UTC.