California earthquakes

M1.8 earthquake 8 km W of Cobb, California

A magnitude 1.8 earthquake struck 8 km W of Cobb, California on Wed, Dec 4, 1985, 1:32 AM PST (09:32 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.0 5 km WSW of Cobb, 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
1.8 (md), micro
Local time
UTC
1985-12-04 09:32:44 UTC
Depth
0.3 km (0.2 mi), shallow
Epicenter
38.818° N, 122.822° 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, 0.4 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
107°
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: 174 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.67 km WSW of Cobb, California · 14893 days ago · 1 km deep · 3 km away
  2. 1.69 km ENE of Hidden Valley Lake, California · 14893 days ago · 9 km deep · 32 km away
  3. 1.89 km ENE of Hidden Valley Lake, California · 14893 days ago · 8 km deep · 32 km away
  4. 1.66 km W of Cobb, California · 14893 days ago · -1 km deep · 2 km away
  5. 2.05 km WSW of Cobb, California · 14893 days ago · 2 km deep · 4 km away
  6. 1.67 km E of Willits, California · 14892 days ago · 8 km deep · 77 km away
  7. 1.66 km WSW of Cobb, California · 14891 days ago · 3 km deep · 3 km away
  8. 1.916 km NE of Lucerne, California · 14891 days ago · 5 km deep · 45 km away
  9. 2.25 km SW of Cobb, California · 14891 days ago · 0 km deep · 6 km away
  10. 1.68 km W of Cobb, California · 14890 days ago · 1 km deep · 2 km away
  11. 1.96 km W of Cobb, California · 14890 days ago · 3 km deep · 2 km away
  12. 2.05 km SW of Cobb, California · 14890 days ago · 1 km deep · 7 km away
  13. 1.54 km WSW of Cobb, California · 14889 days ago · 1 km deep · 4 km away
  14. 1.67 km W of Cobb, California · 14889 days ago · 4 km deep · 1 km away
  15. 1.77 km WSW of Cobb, California · 14888 days ago · 1 km deep · 2 km away
  16. 1.518 km ENE of Sea Ranch, California · 14888 days ago · 3 km deep · 39 km away
  17. 1.76 km W of Cobb, California · 14888 days ago · 3 km deep · 2 km away
  18. 2.39 km WSW of Cobb, California · 14887 days ago · 1 km deep · 2 km away
  19. 1.68 km WSW of Cobb, California · 14887 days ago · 0 km deep · 2 km away
  20. 1.57 km W of Cobb, California · 14887 days ago · 3 km deep · 1 km away
  21. 1.76 km W of Cobb, California · 14886 days ago · 1 km deep · 2 km away
  22. 1.78 km W of Cobb, California · 14885 days ago · 0 km deep · 0 km away
  23. 2.57 km W of Cobb, California · 14885 days ago · 1 km deep · 1 km away
  24. 1.78 km W of Cobb, California · 14885 days ago · 1 km deep · 1 km away
  25. 2.17 km WSW of Cobb, California · 14885 days ago · 1 km deep · 2 km away
  26. 1.94 km WNW of Cobb, California · 14885 days ago · 0 km deep · 5 km away
  27. 1.65 km W of Cobb, California · 14885 days ago · 1 km deep · 4 km away
  28. 1.57 km W of Cobb, California · 14884 days ago · 3 km deep · 1 km away
  29. 1.56 km W of Cobb, California · 14884 days ago · 1 km deep · 3 km away
  30. 1.77 km WSW of Cobb, California · 14884 days ago · 0 km deep · 2 km away
  31. 2.21 km S of Fulton, California · 14883 days ago · 6 km deep · 37 km away
  32. 1.722 km ENE of Potter Valley, California · 14883 days ago · 10 km deep · 65 km away
  33. 1.56 km W of Cobb, California · 14882 days ago · 3 km deep · 2 km away
  34. 1.77 km WSW of Cobb, California · 14882 days ago · 1 km deep · 2 km away
  35. 1.85 km W of Cobb, California · 14882 days ago · -1 km deep · 3 km away
  36. 1.97 km W of Cobb, California · 14881 days ago · 1 km deep · 1 km away
  37. 1.84 km SSW of Hopland, California · 14881 days ago · 6 km deep · 31 km away
  38. 1.910 km NNE of Brooktrails, California · 14880 days ago · 8 km deep · 91 km away
  39. 1.56 km W of Cobb, California · 14880 days ago · 3 km deep · 2 km away
  40. 1.84 km WSW of Cobb, California · 14880 days ago · 1 km deep · 5 km away
  41. 1.55 km WSW of Cobb, California · 14880 days ago · 0 km deep · 4 km away
  42. 1.64 km SSW of Hopland, California · 14880 days ago · 6 km deep · 31 km away
  43. 2.14 km SSW of Hopland, California · 14880 days ago · 6 km deep · 31 km away
  44. 2.09 km WSW of Cobb, California · 14880 days ago · 2 km deep · 2 km away
  45. 1.75 km W of Cobb, California · 14879 days ago · 1 km deep · 4 km away
  46. 1.99 km ENE of Hidden Valley Lake, California · 14879 days ago · 9 km deep · 32 km away
  47. 2.35 km SW of Cobb, California · 14879 days ago · 0 km deep · 6 km away
  48. 1.57 km WSW of Cobb, California · 14879 days ago · 2 km deep · 2 km away
  49. 2.34 km W of Cobb, California · 14878 days ago · 0 km deep · 4 km away
  50. 1.94 km W of Cobb, California · 14878 days ago · 1 km deep · 4 km away
  51. 1.64 km W of Cobb, California · 14878 days ago · -1 km deep · 4 km away
  52. 2.65 km SW of Cobb, California · 14878 days ago · 0 km deep · 6 km away
  53. 1.55 km SW of Cobb, California · 14878 days ago · 0 km deep · 5 km away
  54. 1.66 km WNW of Cobb, California · 14878 days ago · 1 km deep · 3 km away
  55. 1.57 km W of Cobb, California · 14878 days ago · 2 km deep · 2 km away
  56. 1.65 km SW of Cobb, California · 14877 days ago · 0 km deep · 5 km away
  57. 1.64 km S of Cobb, California · 14877 days ago · 1 km deep · 9 km away
  58. 1.64 km S of Cobb, California · 14877 days ago · 2 km deep · 10 km away
  59. 2.10 km SE of Redwood Valley, California · 14876 days ago · 5 km deep · 60 km away
  60. 1.95 km W of Cobb, California · 14876 days ago · 1 km deep · 4 km away

The first 60 of 174.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc60549. Read Tue, Sep 22, 2026, 9:25 PM UTC.