California earthquakes

M2.8 earthquake 9 km NNE of Brooktrails, California

A magnitude 2.8 earthquake struck 9 km NNE of Brooktrails, California on Sat, Feb 4, 1978, 10:00 AM PST (18:00 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M4.5 4 km SE of Calpella, 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
2.8 (md), micro
Local time
UTC
1978-02-04 18:00:37 UTC
Depth
4.1 km (2.6 mi), shallow
Epicenter
39.512° N, 123.327° 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 5.2 km horizontally, 2.5 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
295°, poorly surrounded by stations
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 192 in the 60 days after this one and 44 in the 30 days before it.

After

  1. 2.418 km NE of Upper Lake, California · 17768 days ago · 3 km deep · 53 km away
  2. 1.84 km WSW of Cobb, California · 17767 days ago · 1 km deep · 92 km away
  3. 2.27 km NNE of Hopland, California · 17767 days ago · 1 km deep · 58 km away
  4. 2.27 km NE of Hopland, California · 17767 days ago · 2 km deep · 58 km away
  5. 1.67 km W of Cobb, California · 17766 days ago · 0 km deep · 90 km away
  6. 3.411 km ENE of Laytonville, California · 17766 days ago · -1 km deep · 23 km away
  7. 2.74 km ESE of Willits, California · 17765 days ago · 2 km deep · 13 km away
  8. 2.54 km ESE of Willits, California · 17765 days ago · 2 km deep · 13 km away
  9. 2.711 km NE of Miranda, California · 17762 days ago · 30 km deep · 94 km away
  10. 1.66 km WSW of Cobb, California · 17761 days ago · 4 km deep · 90 km away
  11. 2.08 km ESE of Talmage, California · 17761 days ago · 8 km deep · 51 km away
  12. 2.37 km NNE of Nice, California · 17761 days ago · 7 km deep · 56 km away
  13. 2.46 km W of Cobb, California · 17760 days ago · 2 km deep · 90 km away
  14. 2.16 km W of Cobb, California · 17760 days ago · -1 km deep · 90 km away
  15. 2.56 km W of Cobb, California · 17759 days ago · 3 km deep · 89 km away
  16. 1.66 km W of Cobb, California · 17756 days ago · 1 km deep · 90 km away
  17. 1.77 km W of Cobb, California · 17754 days ago · 3 km deep · 89 km away
  18. 1.76 km W of Cobb, California · 17753 days ago · -1 km deep · 89 km away
  19. 2.319 km SW of Stonyford, California · 17751 days ago · 9 km deep · 59 km away
  20. 2.48 km NNE of Hopland, California · 17750 days ago · 3 km deep · 56 km away
  21. 2.416 km NE of Nice, California · 17748 days ago · 7 km deep · 61 km away
  22. 2.46 km ESE of Willits, California · 17747 days ago · 6 km deep · 14 km away
  23. 2.411 km NNW of Potter Valley, California · 17745 days ago · 1 km deep · 17 km away
  24. 1.820 km WSW of Stonyford, CA · 17745 days ago · -1 km deep · 51 km away
  25. 1.83 km S of Clear Lake Riviera, California · 17744 days ago · 2 km deep · 84 km away
  26. 1.6Northern California · 17744 days ago · 3 km deep · 89 km away
  27. 1.66 km W of Cobb, California · 17744 days ago · 3 km deep · 89 km away
  28. 2.13 km SW of Calpella, California · 17744 days ago · 11 km deep · 35 km away
  29. 2.03 km SW of Calpella, California · 17744 days ago · 8 km deep · 34 km away
  30. 2.19 km NNW of Redwood Valley, California · 17743 days ago · 5 km deep · 20 km away
  31. 1.87 km W of Cobb, California · 17739 days ago · 0 km deep · 89 km away
  32. 1.66 km SSE of Boonville, California · 17739 days ago · 6 km deep · 62 km away
  33. 1.96 km W of Cobb, California · 17739 days ago · 3 km deep · 89 km away
  34. 2.53 km ENE of Willits, California · 17737 days ago · 3 km deep · 10 km away
  35. 2.26 km W of Cobb, California · 17735 days ago · 3 km deep · 90 km away
  36. 2.49 km N of Cloverdale, California · 17734 days ago · 5 km deep · 75 km away
  37. 1.77 km W of Cobb, California · 17734 days ago · 1 km deep · 89 km away
  38. 1.77 km WSW of Cobb, California · 17734 days ago · 2 km deep · 91 km away
  39. 2.07 km WSW of Cobb, California · 17732 days ago · -1 km deep · 91 km away
  40. 2.57 km W of Cobb, California · 17731 days ago · 3 km deep · 89 km away
  41. 1.64 km WSW of Cobb, California · 17730 days ago · -1 km deep · 92 km away
  42. 1.719 km NE of Sea Ranch, California · 17729 days ago · 1 km deep · 78 km away
  43. 1.716 km N of Cazadero, California · 17728 days ago · 0 km deep · 94 km away
  44. 3.03 km W of Ruth, California · 17728 days ago · 40 km deep · 85 km away
  45. 2.60 km ESE of Redway, California · 17726 days ago · 18 km deep · 79 km away
  46. 1.67 km W of Cobb, California · 17725 days ago · 3 km deep · 89 km away
  47. 1.72 km SW of Garberville, California · 17724 days ago · 15 km deep · 76 km away
  48. 3.538 km NW of Paskenta, California · 17723 days ago · 5 km deep · 75 km away
  49. 3.313 km ESE of Ruth, California · 17723 days ago · 41 km deep · 80 km away
  50. 2.613 km ESE of Ruth, California · 17723 days ago · 44 km deep · 78 km away
  51. 3.238 km ESE of Ruth, California · 17723 days ago · 23 km deep · 71 km away
  52. 3.116 km ESE of Ruth, California · 17723 days ago · 48 km deep · 78 km away
  53. 1.816 km ESE of Ruth, California · 17723 days ago · 45 km deep · 77 km away
  54. 3.014 km ESE of Ruth, California · 17723 days ago · 44 km deep · 80 km away
  55. 2.44 km NNE of Talmage, California · 17719 days ago · 8 km deep · 41 km away
  56. 4.54 km SE of Calpella, California · 17719 days ago · 12 km deep · 37 km away
  57. 2.55 km SSE of Calpella, California · 17719 days ago · 1 km deep · 38 km away
  58. 1.83 km SE of Calpella, California · 17719 days ago · 12 km deep · 36 km away
  59. 1.95 km NNE of Brooktrails, California · 17719 days ago · 1 km deep · 4 km away
  60. 2.04 km SE of Calpella, California · 17719 days ago · 7 km deep · 37 km away

The first 60 of 192.

Before

  1. 2.29 km NNW of Redwood Valley, California · 17769 days ago · 7 km deep · 19 km away
  2. 1.86 km W of Cobb, California · 17770 days ago · 0 km deep · 89 km away
  3. 3.15 km ESE of Willits, California · 17772 days ago · 2 km deep · 13 km away
  4. 1.96 km W of Cobb, California · 17773 days ago · 4 km deep · 89 km away
  5. 3.017 km NE of Lucerne, California · 17774 days ago · 6 km deep · 66 km away
  6. 1.56 km WSW of Cobb, California · 17774 days ago · 0 km deep · 91 km away
  7. 2.95 km ENE of Willits, California · 17776 days ago · 0 km deep · 9 km away
  8. 2.07 km W of Cobb, California · 17778 days ago · 0 km deep · 90 km away
  9. 1.68 km W of Cobb, California · 17778 days ago · 0 km deep · 90 km away
  10. 1.511 km WNW of Cobb, California · 17778 days ago · 15 km deep · 84 km away
  11. 2.46 km ESE of Willits, California · 17779 days ago · -1 km deep · 15 km away
  12. 1.815 km SW of Mad River, California · 17779 days ago · 21 km deep · 96 km away
  13. 1.68 km WSW of Cobb, California · 17781 days ago · 1 km deep · 90 km away
  14. 1.65 km W of Cobb, California · 17783 days ago · 3 km deep · 91 km away
  15. 1.710 km NW of Cobb, California · 17783 days ago · 1 km deep · 83 km away
  16. 3.010 km ESE of Willits, California · 17783 days ago · 5 km deep · 16 km away
  17. 2.58 km W of Cobb, California · 17783 days ago · 1 km deep · 89 km away
  18. 2.16 km W of Cobb, California · 17785 days ago · 1 km deep · 91 km away
  19. 2.06 km W of Cobb, California · 17786 days ago · 3 km deep · 89 km away
  20. 3.34 km WNW of Ukiah, California · 17786 days ago · 11 km deep · 39 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038839. Read Tue, Sep 29, 2026, 1:29 AM UTC.