Alaska earthquakes

M3.4 earthquake 76 km SE of Chignik, Alaska

A magnitude 3.4 earthquake struck 76 km SE of Chignik, Alaska on Sun, Jul 22, 2018, 8:21 AM AKDT (16:21 UTC), 41 km (25 mi) below the surface.

A larger quake followed: M4.5 134 km SE 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
3.4 (ML, local (Richter)), minor
Magnitude from
Alaska Earthquake Center
Local time
UTC
2018-07-22 16:21:28 UTC
Depth
40.9 km (25.4 mi), shallow
Epicenter
55.874° N, 157.426° W
Region
Alaska
Felt reports
2
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
3.4ML, local (Richter)Alaska Earthquake CenterPreferred · Preliminary
3.4ML, local (Richter)AACSEPreliminary
4.2mb, body-waveUSGS National Earthquake Information CenterReviewed · ±0.264 · 4 stations

Did you feel it?

2 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Stations used
81

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 32 in the 60 days after this one and 16 in the 30 days before it.

After

  1. 4.2135 km SE of Perryville, Alaska · 2993 days ago · 3 km deep · 87 km away
  2. 3.6141 km SE of Perryville, Alaska · 2993 days ago · 23 km deep · 91 km away
  3. 4.5134 km SE of Perryville, Alaska · 2993 days ago · 26 km deep · 88 km away
  4. 4.3136 km SE of Perryville, Alaska · 2993 days ago · 20 km deep · 85 km away
  5. 2.024 km E of Perryville, Alaska · 2992 days ago · 71 km deep · 83 km away
  6. 2.289 km SSE of Perryville, Alaska · 2991 days ago · 18 km deep · 99 km away
  7. 2.7128 km SE of Perryville, Alaska · 2988 days ago · 18 km deep · 82 km away
  8. 2.9117 km E of Chignik, Alaska · 2988 days ago · 69 km deep · 68 km away
  9. 3.0129 km E of Chignik, Alaska · 2987 days ago · 67 km deep · 86 km away
  10. 2.8124 km SSE of Ugashik, Alaska · 2986 days ago · 68 km deep · 100 km away
  11. 3.079 km SE of Perryville, Alaska · 2981 days ago · 25 km deep · 83 km away
  12. 2.96 km SSW of Chignik Lagoon, Alaska · 2978 days ago · 79 km deep · 81 km away
  13. 2.050 km SSE of Perryville, Alaska · 2976 days ago · 59 km deep · 90 km away
  14. 2.536 km SE of Perryville, Alaska · 2975 days ago · 48 km deep · 89 km away
  15. 2.5117 km SE of Perryville, Alaska · 2973 days ago · 11 km deep · 82 km away
  16. 3.1136 km SE of Perryville, Alaska · 2971 days ago · 18 km deep · 92 km away
  17. 2.515 km S of Chignik Lake, Alaska · 2970 days ago · 73 km deep · 85 km away
  18. 2.5116 km SSE of Ugashik, Alaska · 2969 days ago · 57 km deep · 98 km away
  19. 1.821 km SE of Chignik, Alaska · 2969 days ago · 84 km deep · 57 km away
  20. 2.0133 km E of Chignik, Alaska · 2968 days ago · 80 km deep · 97 km away
  21. 1.778 km E of Chignik, Alaska · 2962 days ago · 67 km deep · 55 km away
  22. 2.744 km ESE of Chignik, Alaska · 2955 days ago · 54 km deep · 39 km away
  23. 2.0south of Alaska · 2955 days ago · 47 km deep · 67 km away
  24. 1.731 km ENE of Chignik, Alaska · 2955 days ago · 67 km deep · 63 km away
  25. 2.054 km ESE of Chignik, Alaska · 2954 days ago · 40 km deep · 35 km away
  26. 2.2133 km E of Chignik, Alaska · 2953 days ago · 62 km deep · 87 km away
  27. 2.325 km S of Chignik, Alaska · 2952 days ago · 70 km deep · 66 km away
  28. 2.218 km N of Chignik, Alaska · 2948 days ago · 86 km deep · 88 km away
  29. 2.164 km ESE of Perryville, Alaska · 2947 days ago · 25 km deep · 49 km away
  30. 2.241 km E of Chignik, Alaska · 2943 days ago · 62 km deep · 55 km away
  31. 1.966 km SSE of Chignik, Alaska · 2937 days ago · 45 km deep · 47 km away
  32. 2.2132 km ESE of Chignik, Alaska · 2935 days ago · 70 km deep · 63 km away

Before

  1. 2.621 km NE of Chignik, Alaska · 2995 days ago · 97 km deep · 77 km away
  2. 2.2Alaska Peninsula · 2998 days ago · 10 km deep · 18 km away
  3. 2.292 km SE of Perryville, Alaska · 2999 days ago · 36 km deep · 58 km away
  4. 2.9131 km E of Chignik, Alaska · 3004 days ago · 70 km deep · 78 km away
  5. 2.367 km SE of Perryville, Alaska · 3005 days ago · 37 km deep · 82 km away
  6. 3.6111 km E of Chignik, Alaska · 3005 days ago · 46 km deep · 64 km away
  7. 2.3Alaska Peninsula · 3005 days ago · 64 km deep · 82 km away
  8. 3.031 km NNE of Chignik Lagoon, Alaska · 3005 days ago · 6 km deep · 98 km away
  9. 2.465 km SE of Perryville, Alaska · 3005 days ago · 40 km deep · 81 km away
  10. 2.1125 km ESE of Chignik, Alaska · 3010 days ago · 64 km deep · 66 km away
  11. 2.2143 km SE of Chignik, AK · 3011 days ago · 20 km deep · 72 km away
  12. 1.610 km NE of Chignik, Alaska · 3012 days ago · 10 km deep · 78 km away
  13. 1.845 km SSE of Chignik, Alaska · 3016 days ago · 74 km deep · 50 km away
  14. 2.0151 km SE of Chignik, Alaska · 3017 days ago · 5 km deep · 78 km away
  15. 2.468 km E of Chignik, Alaska · 3019 days ago · 44 km deep · 38 km away
  16. 2.164 km E of Chignik, Alaska · 3024 days ago · 47 km deep · 40 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0189bzqy69 (also filed as ak19949091, us2000gba3, aacse0189bzqy69). Read Sat, Oct 3, 2026, 4:33 AM UTC.