Alaska earthquakes

M4.0 earthquake 245 km WSW of Adak, Alaska

A magnitude 4.0 earthquake struck 245 km WSW of Adak, Alaska on Mon, Jan 27, 2020, 10:31 AM GMT-12 (22:31 UTC), 10 km (6 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
2020-01-27 22:31:54 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.898° N, 179.793° 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 · ±0.075 · 48 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 5.3 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.07
Depth from
Operator assigned
Station coverage gap
214°, poorly surrounded by stations
Stations used
74

Nearby

Within 100 km, magnitude 1.5 and up: 106 in the 60 days after this one and 135 in the 30 days before it.

After

  1. 3.8248 km WSW of Adak, Alaska · 2439 days ago · 10 km deep · 4 km away
  2. 2.4249 km WSW of Adak, Alaska · 2439 days ago · 26 km deep · 14 km away
  3. 2.2247 km WSW of Adak, Alaska · 2439 days ago · 26 km deep · 9 km away
  4. 2.2255 km WSW of Adak, Alaska · 2439 days ago · 25 km deep · 11 km away
  5. 5.4247 km WSW of Adak, Alaska · 2438 days ago · 10 km deep · 3 km away
  6. 3.3237 km WSW of Adak, Alaska · 2438 days ago · 13 km deep · 18 km away
  7. 2.2251 km WSW of Adak, Alaska · 2438 days ago · 16 km deep · 20 km away
  8. 2.0240 km WSW of Adak, Alaska · 2438 days ago · 13 km deep · 19 km away
  9. 2.6251 km WSW of Adak, Alaska · 2438 days ago · 20 km deep · 20 km away
  10. 4.0249 km WSW of Adak, Alaska · 2438 days ago · 10 km deep · 4 km away
  11. 3.7247 km WSW of Adak, AK · 2438 days ago · 10 km deep · 7 km away
  12. 2.6240 km WSW of Adak, Alaska · 2438 days ago · 14 km deep · 20 km away
  13. 2.8236 km WSW of Adak, Alaska · 2438 days ago · 10 km deep · 30 km away
  14. 3.2240 km WSW of Adak, Alaska · 2438 days ago · 10 km deep · 8 km away
  15. 3.9242 km WSW of Adak, Alaska · 2437 days ago · 17 km deep · 15 km away
  16. 2.1Andreanof Islands, Aleutian Islands, Alaska · 2437 days ago · 13 km deep · 10 km away
  17. 1.8Andreanof Islands, Aleutian Islands, Alaska · 2437 days ago · 13 km deep · 43 km away
  18. 1.8241 km WSW of Adak, Alaska · 2437 days ago · 13 km deep · 21 km away
  19. 2.4226 km W of Adak, Alaska · 2437 days ago · 13 km deep · 97 km away
  20. 4.4240 km WSW of Adak, Alaska · 2437 days ago · 22 km deep · 17 km away
  21. 2.0249 km WSW of Adak, Alaska · 2437 days ago · 26 km deep · 12 km away
  22. 2.4239 km WSW of Adak, Alaska · 2435 days ago · 11 km deep · 16 km away
  23. 2.5238 km WSW of Adak, Alaska · 2435 days ago · 10 km deep · 20 km away
  24. 2.6204 km WSW of Adak, Alaska · 2435 days ago · 76 km deep · 72 km away
  25. 2.6163 km WSW of Adak, AK · 2433 days ago · 35 km deep · 86 km away
  26. 3.0242 km WSW of Adak, Alaska · 2433 days ago · 17 km deep · 17 km away
  27. 4.1272 km WSW of Adak, Alaska · 2433 days ago · 30 km deep · 45 km away
  28. 3.1268 km WSW of Adak, Alaska · 2433 days ago · 10 km deep · 36 km away
  29. 4.2229 km W of Adak, Alaska · 2432 days ago · 97 km deep · 96 km away
  30. 2.9239 km WSW of Adak, Alaska · 2432 days ago · 17 km deep · 32 km away
  31. 2.3210 km WSW of Adak, Alaska · 2431 days ago · 5 km deep · 36 km away
  32. 2.2214 km WSW of Adak, Alaska · 2431 days ago · 13 km deep · 32 km away
  33. 3.2Andreanof Islands, Aleutian Islands, Alaska · 2429 days ago · 14 km deep · 29 km away
  34. 2.9240 km WSW of Adak, Alaska · 2429 days ago · 17 km deep · 35 km away
  35. 2.2253 km W of Adak, Alaska · 2429 days ago · 67 km deep · 83 km away
  36. 3.6274 km WSW of Adak, Alaska · 2426 days ago · 68 km deep · 81 km away
  37. 4.0244 km WSW of Adak, Alaska · 2423 days ago · 35 km deep · 22 km away
  38. 2.6260 km WSW of Adak, Alaska · 2420 days ago · 64 km deep · 75 km away
  39. 2.5188 km WSW of Adak, Alaska · 2420 days ago · 27 km deep · 57 km away
  40. 2.8219 km WSW of Adak, Alaska · 2419 days ago · 6 km deep · 35 km away
  41. 2.8273 km SW of Adak, Alaska · 2419 days ago · 10 km deep · 82 km away
  42. 3.0187 km WSW of Adak, Alaska · 2418 days ago · 35 km deep · 59 km away
  43. 2.4243 km WSW of Adak, Alaska · 2417 days ago · 15 km deep · 15 km away
  44. 3.0294 km SW of Adak, Alaska · 2416 days ago · 10 km deep · 60 km away
  45. 1.9150 km WSW of Adak, Alaska · 2415 days ago · 17 km deep · 98 km away
  46. 1.9239 km WSW of Adak, Alaska · 2415 days ago · 13 km deep · 23 km away
  47. 5.3216 km WSW of Adak, Alaska · 2414 days ago · 10 km deep · 38 km away · tsunami flag
  48. 4.6216 km WSW of Adak, Alaska · 2414 days ago · 10 km deep · 34 km away
  49. 2.9212 km WSW of Adak, Alaska · 2414 days ago · 10 km deep · 37 km away
  50. 3.3219 km WSW of Adak, Alaska · 2414 days ago · 10 km deep · 35 km away
  51. 2.5215 km WSW of Adak, Alaska · 2414 days ago · 10 km deep · 34 km away
  52. 2.8216 km WSW of Adak, Alaska · 2414 days ago · 9 km deep · 35 km away
  53. 2.1207 km W of Adak, Alaska · 2414 days ago · 74 km deep · 74 km away
  54. 2.1244 km WSW of Adak, Alaska · 2411 days ago · 14 km deep · 29 km away
  55. 2.0154 km WSW of Adak, Alaska · 2410 days ago · 25 km deep · 93 km away
  56. 2.1192 km WSW of Adak, Alaska · 2410 days ago · 26 km deep · 56 km away
  57. 2.7244 km WSW of Adak, Alaska · 2410 days ago · 16 km deep · 27 km away
  58. 2.2211 km WSW of Adak, Alaska · 2409 days ago · 74 km deep · 71 km away
  59. 5.7239 km WSW of Adak, Alaska · 2405 days ago · 20 km deep · 24 km away · felt by 1 · tsunami flag
  60. 3.4242 km WSW of Adak, Alaska · 2405 days ago · 13 km deep · 12 km away

The first 60 of 106.

Before

  1. 2.9242 km WSW of Adak, Alaska · 2439 days ago · 10 km deep · 6 km away
  2. 2.4235 km WSW of Adak, Alaska · 2439 days ago · 15 km deep · 15 km away
  3. 5.1239 km WSW of Adak, Alaska · 2439 days ago · 10 km deep · 16 km away
  4. 2.7257 km WSW of Adak, Alaska · 2439 days ago · 22 km deep · 17 km away
  5. 2.8242 km WSW of Adak, Alaska · 2439 days ago · 10 km deep · 7 km away
  6. 2.6241 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 10 km away
  7. 2.5240 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 18 km away
  8. 3.5241 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 8 km away
  9. 1.9248 km WSW of Adak, Alaska · 2440 days ago · 13 km deep · 16 km away
  10. 4.0237 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 9 km away
  11. 2.7Andreanof Islands, Aleutian Islands, Alaska · 2440 days ago · 11 km deep · 4 km away
  12. 3.1239 km WSW of Adak, Alaska · 2440 days ago · 16 km deep · 19 km away
  13. 2.5234 km WSW of Adak, Alaska · 2440 days ago · 15 km deep · 20 km away
  14. 2.7245 km WSW of Adak, Alaska · 2440 days ago · 15 km deep · 12 km away
  15. 3.9249 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 5 km away
  16. 2.6246 km WSW of Adak, Alaska · 2440 days ago · 22 km deep · 15 km away
  17. 4.4247 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 4 km away
  18. 3.8249 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 6 km away
  19. 4.4248 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 4 km away
  20. 4.3247 km WSW of Adak, Alaska · 2440 days ago · 10 km deep · 8 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70007k26 (also filed as ak020190srl3). Read Thu, Oct 1, 2026, 7:18 PM UTC.