California earthquakes

M1.5 earthquake 11 km N of Brooktrails, California

A magnitude 1.5 earthquake struck 11 km N of Brooktrails, California on Sun, Dec 27, 1981, 5:39 PM PST (01:39 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M1.6 3 km NE of Willits, California. This one was a foreshock.

Brooktrails forecastMore in California

Map

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

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The earthquake

Magnitude
1.5 (md), micro
Local time
UTC
1981-12-28 01:39:30 UTC
Depth
6.2 km (3.9 mi), shallow
Epicenter
39.548° N, 123.385° W
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 0.2 km horizontally, 0.9 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
62°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 123 in the 60 days after this one and 75 in the 30 days before it.

After

  1. 1.63 km NE of Willits, California · 16339 days ago · 5 km deep · 14 km away
  2. 1.95 km NNE of Clearlake, California · 16339 days ago · -1 km deep · 91 km away
  3. 2.06 km WSW of Cobb, California · 16338 days ago · -1 km deep · 98 km away
  4. 1.95 km W of Cobb, California · 16338 days ago · 1 km deep · 95 km away
  5. 2.511 km NNW of Alderpoint, California · 16338 days ago · 24 km deep · 84 km away
  6. 1.75 km SW of Cobb, California · 16338 days ago · 0 km deep · 99 km away
  7. 1.68 km WSW of Cobb, California · 16338 days ago · 2 km deep · 96 km away
  8. 1.87 km WSW of Cobb, California · 16338 days ago · 1 km deep · 97 km away
  9. 3.57 km N of Brooktrails, California · 16338 days ago · 7 km deep · 5 km away
  10. 3.2near the coast of Northern California · 16337 days ago · 8 km deep · 5 km away
  11. 2.77 km W of Cobb, California · 16337 days ago · 0 km deep · 96 km away
  12. 1.96 km ESE of Talmage, California · 16337 days ago · 8 km deep · 55 km away
  13. 1.77 km WSW of Cobb, California · 16337 days ago · 3 km deep · 97 km away
  14. 2.35 km SW of Cobb, California · 16336 days ago · 0 km deep · 100 km away
  15. 1.86 km WSW of Cobb, California · 16336 days ago · 1 km deep · 98 km away
  16. 1.57 km N of Brooktrails, California · 16336 days ago · 8 km deep · 4 km away
  17. 1.66 km WSW of Cobb, California · 16335 days ago · 0 km deep · 98 km away
  18. 2.16 km ENE of Willits, California · 16335 days ago · 3 km deep · 15 km away
  19. 1.87 km W of Cobb, California · 16335 days ago · 2 km deep · 95 km away
  20. 1.69 km WSW of Cobb, California · 16335 days ago · 2 km deep · 96 km away
  21. 2.07 km W of Cobb, California · 16335 days ago · 1 km deep · 96 km away
  22. 1.56 km W of Cobb, California · 16333 days ago · 1 km deep · 96 km away
  23. 1.912 km NE of Lucerne, California · 16333 days ago · 0 km deep · 73 km away
  24. 2.014 km SSW of Covelo, California · 16332 days ago · 6 km deep · 15 km away
  25. 1.67 km WSW of Cobb, California · 16332 days ago · 0 km deep · 97 km away
  26. 2.65 km WSW of Cobb, California · 16332 days ago · -1 km deep · 98 km away
  27. 2.113 km NNW of Ruth, California · 16331 days ago · 26 km deep · 93 km away
  28. 2.47 km WSW of Cobb, California · 16331 days ago · 3 km deep · 96 km away
  29. 2.44 km WSW of Cobb, California · 16330 days ago · 1 km deep · 99 km away
  30. 2.47 km W of Cobb, California · 16330 days ago · 4 km deep · 96 km away
  31. 1.87 km E of Willits, California · 16329 days ago · 7 km deep · 18 km away
  32. 2.65 km WSW of Cobb, California · 16329 days ago · 0 km deep · 97 km away
  33. 1.84 km ENE of Miranda, California · 16328 days ago · 30 km deep · 85 km away
  34. 1.96 km W of Cobb, California · 16327 days ago · 3 km deep · 95 km away
  35. 1.610 km NW of Cobb, California · 16327 days ago · -1 km deep · 89 km away
  36. 1.72 km SE of Talmage, California · 16326 days ago · 5 km deep · 52 km away
  37. 2.24 km NNW of Kelseyville, California · 16326 days ago · 63 km deep · 75 km away
  38. 1.58 km WSW of Cobb, California · 16326 days ago · 2 km deep · 97 km away
  39. 1.84 km WSW of Cobb, California · 16326 days ago · 1 km deep · 99 km away
  40. 3.16 km W of Cobb, California · 16325 days ago · 1 km deep · 96 km away
  41. 2.09 km WSW of Cobb, California · 16325 days ago · 1 km deep · 97 km away
  42. 1.717 km NNE of Upper Lake, California · 16325 days ago · 0 km deep · 56 km away
  43. 1.86 km W of Cobb, California · 16324 days ago · 3 km deep · 96 km away
  44. 1.66 km WSW of Cobb, California · 16324 days ago · 0 km deep · 98 km away
  45. 1.69 km W of Cobb, California · 16324 days ago · 1 km deep · 95 km away
  46. 1.86 km WSW of Cobb, California · 16323 days ago · 2 km deep · 97 km away
  47. 1.74 km W of Cobb, California · 16323 days ago · 0 km deep · 97 km away
  48. 2.02 km SSE of Kelseyville, California · 16323 days ago · 14 km deep · 81 km away
  49. 3.07 km W of Cobb, California · 16323 days ago · -1 km deep · 95 km away
  50. 2.78 km W of Cobb, California · 16323 days ago · -1 km deep · 94 km away
  51. 2.026 km W of Elk Creek, California · 16323 days ago · 3 km deep · 48 km away
  52. 2.63 km WNW of Clearlake Oaks, California · 16323 days ago · 4 km deep · 81 km away
  53. 1.67 km W of Cobb, California · 16323 days ago · 1 km deep · 95 km away
  54. 1.96 km W of Cobb, California · 16322 days ago · 4 km deep · 96 km away
  55. 2.33 km ENE of Lower Lake, California · 16322 days ago · 4 km deep · 99 km away
  56. 1.64 km NNE of Myers Flat, California · 16322 days ago · 20 km deep · 93 km away
  57. 2.95 km WNW of Philo, California · 16322 days ago · 18 km deep · 52 km away
  58. 3.04 km WSW of Cobb, California · 16321 days ago · 4 km deep · 98 km away
  59. 1.97 km WSW of Cobb, California · 16320 days ago · 2 km deep · 96 km away
  60. 1.69 km WSW of Cobb, California · 16320 days ago · 2 km deep · 96 km away

The first 60 of 123.

Before

  1. 2.37 km W of Cobb, California · 16340 days ago · 0 km deep · 96 km away
  2. 1.96 km W of Cobb, California · 16340 days ago · 1 km deep · 95 km away
  3. 2.77 km WSW of Cobb, California · 16341 days ago · 0 km deep · 97 km away
  4. 2.59 km WSW of Cobb, California · 16341 days ago · 2 km deep · 96 km away
  5. 2.84 km NE of Hopland, California · 16341 days ago · 6 km deep · 67 km away
  6. 1.96 km W of Cobb, California · 16342 days ago · 3 km deep · 96 km away
  7. 2.28 km NW of Redwood Valley, California · 16342 days ago · 3 km deep · 28 km away
  8. 2.97 km WSW of Cobb, California · 16343 days ago · 1 km deep · 97 km away
  9. 1.83 km ENE of Clear Lake Riviera, California · 16343 days ago · 2 km deep · 88 km away
  10. 1.77 km S of Comptche, California · 16343 days ago · 4 km deep · 43 km away
  11. 1.631 km ESE of Covelo, California · 16343 days ago · 7 km deep · 46 km away
  12. 1.95 km WSW of Cobb, California · 16345 days ago · 1 km deep · 97 km away
  13. 2.0Northern California · 16346 days ago · 3 km deep · 96 km away
  14. 1.5Northern California · 16346 days ago · 1 km deep · 99 km away
  15. 1.87 km W of Cobb, California · 16347 days ago · 3 km deep · 96 km away
  16. 1.720 km NE of Potter Valley, California · 16347 days ago · 7 km deep · 39 km away
  17. 1.620 km NE of Potter Valley, California · 16347 days ago · 4 km deep · 39 km away
  18. 2.210 km W of Laytonville, California · 16347 days ago · 49 km deep · 26 km away
  19. 1.69 km NNE of Laytonville, California · 16347 days ago · 4 km deep · 26 km away
  20. 1.57 km W of Cobb, California · 16348 days ago · 1 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1070728. Read Tue, Sep 22, 2026, 5:23 PM UTC.