California earthquakes

M2.1 earthquake 4 km W of Cobb, California

A magnitude 2.1 earthquake struck 4 km W of Cobb, California on Tue, Dec 10, 1985, 1:02 PM PST (21:02 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.6 8 km WSW of Kelseyville, California. This one was a foreshock.

Cobb 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
2.1 (md), micro
Local time
UTC
1985-12-10 21:02:06 UTC
Depth
1.1 km (0.7 mi), shallow
Epicenter
38.821° N, 122.779° 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, 0.3 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
40°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 177 in the 60 days after this one and 127 in the 30 days before it.

After

  1. 2.08 km WSW of Cobb, California · 14903 days ago · 3 km deep · 4 km away
  2. 2.02 km W of Forestville, California · 14903 days ago · 0 km deep · 41 km away
  3. 1.87 km WSW of Cobb, California · 14903 days ago · 1 km deep · 3 km away
  4. 2.45 km SSW of Calistoga, California · 14903 days ago · 5 km deep · 36 km away
  5. 1.75 km SE of Calpella, California · 14903 days ago · 5 km deep · 54 km away
  6. 1.64 km S of Cobb, California · 14902 days ago · 1 km deep · 7 km away
  7. 1.56 km W of Cobb, California · 14902 days ago · -1 km deep · 2 km away
  8. 1.76 km W of Cobb, California · 14902 days ago · 3 km deep · 2 km away
  9. 2.27 km W of Cobb, California · 14902 days ago · 1 km deep · 3 km away
  10. 1.77 km W of Cobb, California · 14902 days ago · 0 km deep · 3 km away
  11. 1.84 km W of Cobb, California · 14901 days ago · 1 km deep · 0 km away
  12. 1.64 km W of Cobb, California · 14901 days ago · 1 km deep · 0 km away
  13. 1.77 km WSW of Cobb, California · 14901 days ago · 3 km deep · 4 km away
  14. 1.67 km WSW of Cobb, California · 14900 days ago · 1 km deep · 3 km away
  15. 1.69 km ENE of Hidden Valley Lake, California · 14900 days ago · 9 km deep · 28 km away
  16. 1.89 km ENE of Hidden Valley Lake, California · 14900 days ago · 8 km deep · 28 km away
  17. 1.66 km W of Cobb, California · 14900 days ago · -1 km deep · 2 km away
  18. 2.05 km WSW of Cobb, California · 14900 days ago · 2 km deep · 1 km away
  19. 1.67 km E of Willits, California · 14898 days ago · 8 km deep · 78 km away
  20. 1.66 km WSW of Cobb, California · 14898 days ago · 3 km deep · 2 km away
  21. 1.916 km NE of Lucerne, California · 14898 days ago · 5 km deep · 44 km away
  22. 2.25 km SW of Cobb, California · 14898 days ago · 0 km deep · 4 km away
  23. 1.68 km W of Cobb, California · 14897 days ago · 1 km deep · 4 km away
  24. 1.96 km W of Cobb, California · 14896 days ago · 3 km deep · 2 km away
  25. 2.05 km SW of Cobb, California · 14896 days ago · 1 km deep · 5 km away
  26. 1.54 km WSW of Cobb, California · 14896 days ago · 1 km deep · 2 km away
  27. 1.67 km W of Cobb, California · 14896 days ago · 4 km deep · 3 km away
  28. 1.77 km WSW of Cobb, California · 14895 days ago · 1 km deep · 3 km away
  29. 1.518 km ENE of Sea Ranch, California · 14894 days ago · 3 km deep · 43 km away
  30. 1.76 km W of Cobb, California · 14894 days ago · 3 km deep · 2 km away
  31. 2.39 km WSW of Cobb, California · 14894 days ago · 1 km deep · 5 km away
  32. 1.68 km WSW of Cobb, California · 14894 days ago · 0 km deep · 4 km away
  33. 1.57 km W of Cobb, California · 14894 days ago · 3 km deep · 3 km away
  34. 1.76 km W of Cobb, California · 14893 days ago · 1 km deep · 2 km away
  35. 1.78 km W of Cobb, California · 14892 days ago · 0 km deep · 3 km away
  36. 2.57 km W of Cobb, California · 14892 days ago · 1 km deep · 3 km away
  37. 1.78 km W of Cobb, California · 14892 days ago · 1 km deep · 3 km away
  38. 2.17 km WSW of Cobb, California · 14891 days ago · 1 km deep · 3 km away
  39. 1.94 km WNW of Cobb, California · 14891 days ago · 0 km deep · 2 km away
  40. 1.65 km W of Cobb, California · 14891 days ago · 1 km deep · 0 km away
  41. 1.57 km W of Cobb, California · 14891 days ago · 3 km deep · 3 km away
  42. 1.56 km W of Cobb, California · 14891 days ago · 1 km deep · 2 km away
  43. 1.77 km WSW of Cobb, California · 14891 days ago · 0 km deep · 3 km away
  44. 2.21 km S of Fulton, California · 14890 days ago · 6 km deep · 37 km away
  45. 1.722 km ENE of Potter Valley, California · 14889 days ago · 10 km deep · 65 km away
  46. 1.56 km W of Cobb, California · 14889 days ago · 3 km deep · 2 km away
  47. 1.77 km WSW of Cobb, California · 14889 days ago · 1 km deep · 3 km away
  48. 1.85 km W of Cobb, California · 14889 days ago · -1 km deep · 0 km away
  49. 1.97 km W of Cobb, California · 14888 days ago · 1 km deep · 3 km away
  50. 1.84 km SSW of Hopland, California · 14888 days ago · 6 km deep · 34 km away
  51. 1.910 km NNE of Brooktrails, California · 14887 days ago · 8 km deep · 93 km away
  52. 1.56 km W of Cobb, California · 14887 days ago · 3 km deep · 2 km away
  53. 1.84 km WSW of Cobb, California · 14887 days ago · 1 km deep · 2 km away
  54. 1.55 km WSW of Cobb, California · 14887 days ago · 0 km deep · 3 km away
  55. 1.64 km SSW of Hopland, California · 14887 days ago · 6 km deep · 34 km away
  56. 2.14 km SSW of Hopland, California · 14887 days ago · 6 km deep · 34 km away
  57. 2.09 km WSW of Cobb, California · 14886 days ago · 2 km deep · 5 km away
  58. 1.75 km W of Cobb, California · 14886 days ago · 1 km deep · 1 km away
  59. 1.99 km ENE of Hidden Valley Lake, California · 14886 days ago · 9 km deep · 28 km away
  60. 2.35 km SW of Cobb, California · 14886 days ago · 0 km deep · 4 km away

The first 60 of 177.

Before

  1. 1.65 km SW of Cobb, California · 14903 days ago · 0 km deep · 3 km away
  2. 2.32 km S of Lakeport, California · 14903 days ago · 21 km deep · 25 km away
  3. 1.84 km WSW of Cobb, California · 14904 days ago · 0 km deep · 1 km away
  4. 1.68 km W of Cobb, California · 14904 days ago · 0 km deep · 3 km away
  5. 2.07 km W of Cobb, California · 14904 days ago · -1 km deep · 3 km away
  6. 1.66 km W of Cobb, California · 14904 days ago · 2 km deep · 2 km away
  7. 1.77 km W of Cobb, California · 14904 days ago · 1 km deep · 2 km away
  8. 2.1Northern California · 14905 days ago · 1 km deep · 2 km away
  9. 1.67 km WSW of Cobb, California · 14905 days ago · 0 km deep · 3 km away
  10. 1.76 km W of Cobb, California · 14905 days ago · 2 km deep · 2 km away
  11. 1.68 km W of Cobb, California · 14905 days ago · -1 km deep · 3 km away
  12. 1.97 km W of Cobb, California · 14906 days ago · 1 km deep · 3 km away
  13. 1.67 km W of Cobb, California · 14906 days ago · 1 km deep · 3 km away
  14. 1.97 km W of Cobb, California · 14906 days ago · 1 km deep · 3 km away
  15. 1.55 km SW of Cobb, California · 14906 days ago · 1 km deep · 3 km away
  16. 1.79 km W of Cobb, California · 14906 days ago · 1 km deep · 5 km away
  17. 1.73 km W of Glen Ellen, California · 14906 days ago · 9 km deep · 54 km away
  18. 1.73 km WNW of Cobb, California · 14906 days ago · 0 km deep · 2 km away
  19. 2.06 km W of Cobb, California · 14906 days ago · 3 km deep · 2 km away
  20. 2.9Northern California · 14906 days ago · 0 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc61095. Read Tue, Sep 29, 2026, 4:19 PM UTC.