Alaska earthquakes

M4.0 earthquake 244 km WSW of Adak, Alaska

A magnitude 4.0 earthquake struck 244 km WSW of Adak, Alaska on Wed, Feb 12, 2020, 5:39 AM GMT-12 (17:39 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.7 239 km WSW of Adak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-02-12 17:39:00 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.085° N, 179.916° 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
4.0mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.082 · 40 stations
3.4ML, local (Richter)Alaska Earthquake CenterPreliminary

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 4.6 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
190°, poorly surrounded by stations
Stations used
85

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 160 in the 30 days before it.

After

  1. 2.6260 km WSW of Adak, Alaska · 2420 days ago · 64 km deep · 53 km away
  2. 2.5188 km WSW of Adak, Alaska · 2420 days ago · 27 km deep · 61 km away
  3. 2.8219 km WSW of Adak, Alaska · 2420 days ago · 6 km deep · 51 km away
  4. 3.0187 km WSW of Adak, Alaska · 2418 days ago · 35 km deep · 56 km away
  5. 2.4243 km WSW of Adak, Alaska · 2417 days ago · 15 km deep · 8 km away
  6. 3.0294 km SW of Adak, Alaska · 2416 days ago · 10 km deep · 77 km away
  7. 2.6226 km W of Adak, Alaska · 2416 days ago · 123 km deep · 89 km away
  8. 1.6264 km W of Adak, Alaska · 2416 days ago · 15 km deep · 97 km away
  9. 1.6258 km W of Adak, Alaska · 2416 days ago · 13 km deep · 98 km away
  10. 1.9150 km WSW of Adak, Alaska · 2415 days ago · 17 km deep · 94 km away
  11. 1.5257 km W of Adak, Alaska · 2415 days ago · 14 km deep · 96 km away
  12. 1.9239 km WSW of Adak, Alaska · 2415 days ago · 13 km deep · 5 km away
  13. 5.3216 km WSW of Adak, Alaska · 2415 days ago · 10 km deep · 53 km away · tsunami flag
  14. 4.6216 km WSW of Adak, Alaska · 2415 days ago · 10 km deep · 48 km away
  15. 2.9212 km WSW of Adak, Alaska · 2415 days ago · 10 km deep · 49 km away
  16. 3.3219 km WSW of Adak, Alaska · 2415 days ago · 10 km deep · 52 km away
  17. 2.5215 km WSW of Adak, Alaska · 2415 days ago · 10 km deep · 47 km away
  18. 2.8216 km WSW of Adak, Alaska · 2415 days ago · 9 km deep · 49 km away
  19. 2.1207 km W of Adak, Alaska · 2414 days ago · 74 km deep · 57 km away
  20. 2.1244 km WSW of Adak, Alaska · 2411 days ago · 14 km deep · 7 km away
  21. 1.6261 km W of Adak, Alaska · 2411 days ago · 10 km deep · 98 km away
  22. 2.0154 km WSW of Adak, Alaska · 2411 days ago · 25 km deep · 97 km away
  23. 2.1192 km WSW of Adak, Alaska · 2410 days ago · 26 km deep · 52 km away
  24. 2.7244 km WSW of Adak, Alaska · 2410 days ago · 16 km deep · 5 km away
  25. 2.2211 km WSW of Adak, Alaska · 2409 days ago · 74 km deep · 53 km away
  26. 1.8268 km W of Adak, Alaska · 2409 days ago · 16 km deep · 96 km away
  27. 3.7Rat Islands, Aleutian Islands, Alaska · 2407 days ago · 54 km deep · 98 km away
  28. 5.7239 km WSW of Adak, Alaska · 2405 days ago · 20 km deep · 5 km away · felt by 1 · tsunami flag
  29. 3.4242 km WSW of Adak, Alaska · 2405 days ago · 13 km deep · 10 km away
  30. 2.3239 km WSW of Adak, Alaska · 2405 days ago · 28 km deep · 18 km away
  31. 2.8244 km WSW of Adak, Alaska · 2405 days ago · 15 km deep · 4 km away
  32. 2.3263 km W of Adak, Alaska · 2405 days ago · 11 km deep · 56 km away
  33. 2.5244 km WSW of Adak, Alaska · 2405 days ago · 10 km deep · 6 km away
  34. 2.2237 km WSW of Adak, Alaska · 2405 days ago · 13 km deep · 13 km away
  35. 2.8240 km WSW of Adak, Alaska · 2405 days ago · 10 km deep · 14 km away
  36. 2.0237 km WSW of Adak, Alaska · 2405 days ago · 14 km deep · 12 km away
  37. 2.4237 km WSW of Adak, Alaska · 2405 days ago · 16 km deep · 13 km away
  38. 3.5239 km WSW of Adak, Alaska · 2404 days ago · 10 km deep · 14 km away
  39. 5.0238 km WSW of Adak, Alaska · 2404 days ago · 10 km deep · 10 km away · felt by 2
  40. 2.0235 km WSW of Adak, Alaska · 2404 days ago · 26 km deep · 11 km away
  41. 1.5244 km WSW of Adak, Alaska · 2403 days ago · 16 km deep · 33 km away
  42. 1.6Rat Islands, Aleutian Islands, Alaska · 2403 days ago · 25 km deep · 62 km away
  43. 3.0234 km WSW of Adak, Alaska · 2403 days ago · 18 km deep · 11 km away
  44. 4.1240 km WSW of Adak, Alaska · 2403 days ago · 10 km deep · 17 km away
  45. 3.5235 km WSW of Adak, Alaska · 2400 days ago · 57 km deep · 31 km away
  46. 2.8186 km WSW of Adak, Alaska · 2400 days ago · 30 km deep · 63 km away
  47. 2.0176 km WSW of Adak, Alaska · 2399 days ago · 26 km deep · 68 km away
  48. 1.9216 km WSW of Adak, Alaska · 2399 days ago · 25 km deep · 27 km away
  49. 2.9202 km WSW of Adak, Alaska · 2399 days ago · 10 km deep · 56 km away
  50. 2.7242 km WSW of Adak, Alaska · 2398 days ago · 35 km deep · 16 km away
  51. 2.2158 km WSW of Adak, Alaska · 2398 days ago · 13 km deep · 85 km away
  52. 1.9239 km WSW of Adak, Alaska · 2396 days ago · 5 km deep · 16 km away
  53. 2.0187 km WSW of Adak, Alaska · 2395 days ago · 24 km deep · 57 km away
  54. 1.9205 km WSW of Adak, Alaska · 2395 days ago · 17 km deep · 45 km away
  55. 2.1188 km WSW of Adak, Alaska · 2395 days ago · 24 km deep · 56 km away
  56. 4.3Rat Islands, Aleutian Islands, Alaska · 2395 days ago · 36 km deep · 88 km away
  57. 2.4235 km WSW of Adak, Alaska · 2394 days ago · 23 km deep · 23 km away
  58. 2.3255 km W of Adak, Alaska · 2393 days ago · 93 km deep · 74 km away
  59. 2.9223 km WSW of Adak, Alaska · 2392 days ago · 10 km deep · 27 km away
  60. 2.0211 km WSW of Adak, Alaska · 2391 days ago · 10 km deep · 42 km away

The first 60 of 107.

Before

  1. 2.1165 km W of Adak, Alaska · 2427 days ago · 8 km deep · 95 km away
  2. 3.6274 km WSW of Adak, Alaska · 2427 days ago · 68 km deep · 60 km away
  3. 3.0236 km W of Adak, Alaska · 2427 days ago · 179 km deep · 95 km away
  4. 2.2253 km W of Adak, Alaska · 2429 days ago · 67 km deep · 60 km away
  5. 2.9240 km WSW of Adak, Alaska · 2429 days ago · 17 km deep · 13 km away
  6. 3.2Andreanof Islands, Aleutian Islands, Alaska · 2430 days ago · 14 km deep · 8 km away
  7. 2.2214 km WSW of Adak, Alaska · 2431 days ago · 13 km deep · 40 km away
  8. 2.3210 km WSW of Adak, Alaska · 2431 days ago · 5 km deep · 44 km away
  9. 2.9239 km WSW of Adak, Alaska · 2432 days ago · 17 km deep · 10 km away
  10. 4.2229 km W of Adak, Alaska · 2432 days ago · 97 km deep · 75 km away
  11. 3.1268 km WSW of Adak, Alaska · 2433 days ago · 10 km deep · 25 km away
  12. 4.1272 km WSW of Adak, Alaska · 2433 days ago · 30 km deep · 31 km away
  13. 3.0242 km WSW of Adak, Alaska · 2434 days ago · 17 km deep · 6 km away
  14. 2.6163 km WSW of Adak, AK · 2434 days ago · 35 km deep · 82 km away
  15. 2.6204 km WSW of Adak, Alaska · 2435 days ago · 76 km deep · 55 km away
  16. 2.5238 km WSW of Adak, Alaska · 2436 days ago · 10 km deep · 7 km away
  17. 2.4239 km WSW of Adak, Alaska · 2436 days ago · 11 km deep · 9 km away
  18. 2.0249 km WSW of Adak, Alaska · 2437 days ago · 26 km deep · 13 km away
  19. 4.4240 km WSW of Adak, Alaska · 2437 days ago · 22 km deep · 7 km away
  20. 2.4226 km W of Adak, Alaska · 2437 days ago · 13 km deep · 76 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70007t1m (also filed as ak0201zegkch). Read Fri, Oct 2, 2026, 9:13 AM UTC.