Alaska earthquakes

M1.8 earthquake 21 km SE of Chignik, Alaska

A magnitude 1.8 earthquake struck 21 km SE of Chignik, Alaska on Fri, Aug 17, 2018, 12:13 AM AKDT (08:13 UTC), 84 km (52 mi) below the surface.

A larger quake followed: M5.0 34 km SSE of Perryville, 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
1.8 (ML, local (Richter)), micro
Magnitude from
Alaska Earthquake Center
Local time
UTC
2018-08-17 08:13:27 UTC
Depth
83.8 km (52.1 mi), intermediate-depth
Epicenter
56.137° N, 158.211° 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
1.8ML, local (Richter)Alaska Earthquake CenterPreferred · Preliminary
1.8ML, local (Richter)AACSEPreliminary

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
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 26 in the 60 days after this one and 14 in the 30 days before it.

After

  1. 1.778 km E of Chignik, Alaska · 2961 days ago · 67 km deep · 71 km away
  2. 2.458 km E of Port Heiden, Alaska · 2954 days ago · 93 km deep · 97 km away
  3. 2.744 km ESE of Chignik, Alaska · 2954 days ago · 54 km deep · 32 km away
  4. 1.731 km ENE of Chignik, Alaska · 2953 days ago · 67 km deep · 33 km away
  5. 2.054 km ESE of Chignik, Alaska · 2953 days ago · 40 km deep · 42 km away
  6. 2.325 km S of Chignik, Alaska · 2951 days ago · 70 km deep · 16 km away
  7. 2.218 km N of Chignik, Alaska · 2947 days ago · 86 km deep · 38 km away
  8. 2.164 km ESE of Perryville, Alaska · 2945 days ago · 25 km deep · 46 km away
  9. 2.060 km E of Port Heiden, Alaska · 2945 days ago · 4 km deep · 98 km away
  10. 2.241 km E of Chignik, Alaska · 2941 days ago · 62 km deep · 37 km away
  11. 2.165 km S of Ugashik, Alaska · 2936 days ago · 84 km deep · 98 km away
  12. 1.966 km SSE of Chignik, Alaska · 2935 days ago · 45 km deep · 47 km away
  13. 3.337 km ESE of Perryville, Alaska · 2931 days ago · 63 km deep · 45 km away
  14. 2.051 km ESE of Port Heiden, Alaska · 2930 days ago · 84 km deep · 74 km away
  15. 1.849 km E of Port Heiden, Alaska · 2924 days ago · 4 km deep · 96 km away
  16. 3.052 km SE of Perryville, Alaska · 2923 days ago · 49 km deep · 57 km away
  17. 2.529 km SE of Chignik, Alaska · 2921 days ago · 71 km deep · 9 km away
  18. 2.554 km SSE of Perryville, Alaska · 2920 days ago · 21 km deep · 81 km away
  19. 2.165 km ENE of Chignik, Alaska · 2917 days ago · 58 km deep · 63 km away
  20. 2.399 km SE of Chignik, Alaska · 2915 days ago · 12 km deep · 79 km away
  21. 2.566 km SE of Perryville, Alaska · 2915 days ago · 40 km deep · 83 km away
  22. 5.034 km SSE of Perryville, Alaska · 2913 days ago · 48 km deep · 70 km away · tsunami flag
  23. 2.026 km SSE of Perryville, Alaska · 2913 days ago · 49 km deep · 69 km away
  24. 2.722 km SSE of Perryville, Alaska · 2912 days ago · 44 km deep · 68 km away
  25. 2.611 km WNW of Ivanof Bay, Alaska · 2908 days ago · 107 km deep · 93 km away
  26. 2.546 km E of Port Heiden, Alaska · 2908 days ago · 8 km deep · 96 km away

Before

  1. 2.515 km S of Chignik Lake, Alaska · 2968 days ago · 73 km deep · 32 km away
  2. 2.766 km SSE of Perryville, Alaska · 2972 days ago · 35 km deep · 96 km away
  3. 2.536 km SE of Perryville, Alaska · 2973 days ago · 48 km deep · 65 km away
  4. 2.325 km S of Ivanof Bay, Alaska · 2973 days ago · 94 km deep · 91 km away
  5. 3.0Alaska Peninsula · 2974 days ago · 132 km deep · 78 km away
  6. 2.050 km SSE of Perryville, Alaska · 2975 days ago · 59 km deep · 75 km away
  7. 2.96 km SSW of Chignik Lagoon, Alaska · 2976 days ago · 79 km deep · 25 km away
  8. 1.952 km E of Port Heiden, Alaska · 2977 days ago · 4 km deep · 94 km away
  9. 3.079 km SE of Perryville, Alaska · 2979 days ago · 25 km deep · 88 km away
  10. 2.637 km S of Perryville, Alaska · 2982 days ago · 55 km deep · 90 km away
  11. 2.024 km E of Perryville, Alaska · 2990 days ago · 71 km deep · 45 km away
  12. 3.476 km SE of Chignik, Alaska · 2993 days ago · 41 km deep · 57 km away · felt by 2
  13. 2.621 km NE of Chignik, Alaska · 2994 days ago · 97 km deep · 33 km away
  14. 2.2Alaska Peninsula · 2996 days ago · 10 km deep · 39 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak018aiuwsbs (also filed as ak20244903, aacse018aiuwsbs). Read Thu, Oct 1, 2026, 2:24 PM UTC.