Alaska earthquakes

M2.5 earthquake 187 km S of Unalaska, Alaska

A magnitude 2.5 earthquake struck 187 km S of Unalaska, Alaska on Tue, Aug 3, 2021, 3:13 PM AKDT (23:13 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.8 192 km SE of Nikolski, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.5 (ml), micro
Local time
UTC
2021-08-03 23:13:45 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
52.220° N, 165.990° 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 7.2 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
291°, poorly surrounded by stations
Stations used
17

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.0144 km ESE of Nikolski, Alaska · 1876 days ago · 25 km deep · 67 km away
  2. 2.2171 km SE of Unalaska, Alaska · 1872 days ago · 26 km deep · 78 km away
  3. 2.8192 km SE of Nikolski, Alaska · 1871 days ago · 10 km deep · 49 km away
  4. 2.0137 km S of Unalaska, Alaska · 1871 days ago · 9 km deep · 73 km away
  5. 1.5141 km S of Unalaska, Alaska · 1869 days ago · 13 km deep · 70 km away
  6. 3.5147 km ESE of Nikolski, Alaska · 1868 days ago · 18 km deep · 63 km away
  7. 1.8151 km ESE of Nikolski, Alaska · 1860 days ago · 18 km deep · 60 km away
  8. 2.8185 km SSE of Unalaska, Alaska · 1856 days ago · 10 km deep · 2 km away
  9. 1.8200 km SSE of Unalaska, Alaska · 1855 days ago · 26 km deep · 80 km away
  10. 1.8135 km ESE of Nikolski, Alaska · 1850 days ago · 25 km deep · 75 km away
  11. 2.0152 km ESE of Nikolski, Alaska · 1850 days ago · 15 km deep · 58 km away
  12. 1.9140 km ESE of Nikolski, Alaska · 1848 days ago · 14 km deep · 71 km away
  13. 1.9136 km ESE of Nikolski, Alaska · 1847 days ago · 7 km deep · 77 km away
  14. 3.6127 km S of Unalaska, Alaska · 1843 days ago · 7 km deep · 77 km away
  15. 1.8144 km S of Unalaska, Alaska · 1843 days ago · 26 km deep · 54 km away
  16. 1.7143 km S of Unalaska, Alaska · 1843 days ago · 21 km deep · 59 km away
  17. 1.6124 km S of Unalaska, Alaska · 1842 days ago · 2 km deep · 80 km away
  18. 3.2109 km SSW of Unalaska, Alaska · 1822 days ago · 29 km deep · 98 km away

Before

  1. 2.8195 km SSE of Unalaska, Alaska · 1879 days ago · 10 km deep · 40 km away
  2. 1.8192 km SSE of Unalaska, Alaska · 1887 days ago · 19 km deep · 37 km away
  3. 2.6185 km SE of Nikolski, Alaska · 1887 days ago · 21 km deep · 86 km away
  4. 1.5106 km SSE of Unalaska, Alaska · 1887 days ago · 14 km deep · 98 km away
  5. 1.6141 km ESE of Nikolski, Alaska · 1887 days ago · 11 km deep · 70 km away
  6. 1.6125 km S of Unalaska, Alaska · 1896 days ago · 17 km deep · 73 km away
  7. 1.9141 km ESE of Nikolski, Alaska · 1897 days ago · 25 km deep · 69 km away
  8. 1.9109 km SSE of Unalaska, Alaska · 1901 days ago · 14 km deep · 94 km away
  9. 2.2210 km SSE of Unalaska, Alaska · 1901 days ago · 12 km deep · 49 km away
  10. 2.9126 km S of Unalaska, Alaska · 1902 days ago · 8 km deep · 73 km away
  11. 2.2126 km S of Unalaska, Alaska · 1902 days ago · 12 km deep · 75 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f42i (also filed as ak0219vybh1k). Read Wed, Sep 23, 2026, 9:58 AM UTC.