California earthquakes

M3.4 earthquake 6 km W of Cobb, California

A magnitude 3.4 earthquake struck 6 km W of Cobb, California on Sun, Oct 20, 1985, 12:26 PM PDT (19:26 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.1 5 km NW 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
3.4 (ml), minor
Local time
UTC
1985-10-20 19:26:26 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
38.819° N, 122.793° 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 0.1 km horizontally, 0.2 km in depth
Depth from
From location
Station coverage gap
39°
Stations used
44

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 175 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 3.19 km W of Cobb, California · 14928 days ago · 1 km deep · 3 km away
  2. 3.09 km W of Cobb, California · 14928 days ago · -1 km deep · 4 km away
  3. 2.29 km W of Cobb, California · 14928 days ago · 1 km deep · 3 km away
  4. 2.09 km W of Cobb, California · 14928 days ago · 0 km deep · 3 km away
  5. 1.99 km W of Cobb, California · 14928 days ago · 0 km deep · 3 km away
  6. 2.48 km W of Cobb, California · 14928 days ago · 0 km deep · 3 km away
  7. 1.85 km WSW of Cobb, California · 14928 days ago · 1 km deep · 2 km away
  8. 1.75 km W of Cobb, California · 14928 days ago · 1 km deep · 1 km away
  9. 1.77 km W of Cobb, California · 14928 days ago · 3 km deep · 1 km away
  10. 1.56 km SW of Cobb, California · 14927 days ago · 0 km deep · 5 km away
  11. 1.823 km SE of Covelo, California · 14927 days ago · 5 km deep · 93 km away
  12. 2.06 km WSW of Calistoga, California · 14927 days ago · -1 km deep · 31 km away
  13. 2.07 km WSW of Calistoga, California · 14927 days ago · 0 km deep · 32 km away
  14. 1.85 km WNW of Cobb, California · 14926 days ago · 2 km deep · 3 km away
  15. 1.69 km W of Cobb, California · 14926 days ago · 0 km deep · 3 km away
  16. 1.75 km WSW of Cobb, California · 14925 days ago · 0 km deep · 3 km away
  17. 2.613 km N of Brooktrails, California · 14925 days ago · 9 km deep · 98 km away
  18. 1.96 km SW of Cobb, California · 14924 days ago · 1 km deep · 4 km away
  19. 1.75 km SW of Cobb, California · 14924 days ago · 0 km deep · 4 km away
  20. 4.15 km NW of Cobb, California · 14924 days ago · -1 km deep · 4 km away
  21. 1.65 km W of Robbins, California · 14924 days ago · 2 km deep · 89 km away
  22. 1.63 km WNW of Cobb, California · 14924 days ago · 0 km deep · 3 km away
  23. 1.86 km WSW of Cobb, California · 14924 days ago · 3 km deep · 2 km away
  24. 2.03 km WNW of Cobb, California · 14923 days ago · 0 km deep · 3 km away
  25. 1.513 km N of Brooktrails, California · 14923 days ago · 9 km deep · 98 km away
  26. 1.89 km E of Hopland, California · 14923 days ago · 2 km deep · 25 km away
  27. 2.15 km SW of Cobb, California · 14923 days ago · 1 km deep · 5 km away
  28. 1.66 km W of Cobb, California · 14923 days ago · 2 km deep · 1 km away
  29. 1.914 km E of Angwin, California · 14923 days ago · 1 km deep · 51 km away
  30. 2.17 km W of Cobb, California · 14922 days ago · 1 km deep · 2 km away
  31. 1.97 km W of Cobb, California · 14922 days ago · 1 km deep · 2 km away
  32. 1.76 km WSW of Calistoga, California · 14922 days ago · 1 km deep · 31 km away
  33. 1.66 km ENE of Brooktrails, California · 14921 days ago · 7 km deep · 86 km away
  34. 1.614 km ESE of Hidden Valley Lake, California · 14920 days ago · -1 km deep · 34 km away
  35. 1.66 km W of Cobb, California · 14920 days ago · 2 km deep · 1 km away
  36. 1.514 km SSE of Laytonville, California · 14919 days ago · 10 km deep · 99 km away
  37. 1.98 km W of Cobb, California · 14919 days ago · 1 km deep · 3 km away
  38. 1.84 km W of Cobb, California · 14919 days ago · 0 km deep · 1 km away
  39. 2.68 km W of Cobb, California · 14919 days ago · 1 km deep · 2 km away
  40. 1.98 km W of Lodoga, California · 14919 days ago · 4 km deep · 56 km away
  41. 1.51 km E of Knights Landing, California · 14918 days ago · 1 km deep · 95 km away
  42. 1.55 km SW of Cobb, California · 14918 days ago · 0 km deep · 3 km away
  43. 2.36 km W of Cobb, California · 14917 days ago · 3 km deep · 1 km away
  44. 1.5Northern California · 14917 days ago · 1 km deep · 5 km away
  45. 1.76 km W of Cobb, California · 14917 days ago · 3 km deep · 1 km away
  46. 1.79 km WSW of Cobb, California · 14916 days ago · 2 km deep · 3 km away
  47. 1.65 km WSW of Cobb, California · 14916 days ago · 2 km deep · 2 km away
  48. 1.85 km WSW of Cobb, California · 14916 days ago · 1 km deep · 2 km away
  49. 1.86 km W of Cobb, California · 14915 days ago · 1 km deep · 1 km away
  50. 2.13 km ESE of Cloverdale, California · 14915 days ago · 2 km deep · 17 km away
  51. 2.212 km E of Geyserville, California · 14914 days ago · 3 km deep · 14 km away
  52. 2.29 km WSW of Cobb, California · 14914 days ago · 1 km deep · 4 km away
  53. 1.57 km WSW of Cobb, California · 14914 days ago · 2 km deep · 2 km away
  54. 1.59 km SSE of Willits, California · 14914 days ago · 7 km deep · 73 km away
  55. 1.77 km WSW of Cobb, California · 14914 days ago · 1 km deep · 2 km away
  56. 1.65 km SW of Cobb, California · 14914 days ago · 0 km deep · 4 km away
  57. 2.55 km SW of Cobb, California · 14914 days ago · 0 km deep · 4 km away
  58. 2.27 km W of Cobb, California · 14914 days ago · 0 km deep · 2 km away
  59. 2.05 km SW of Cobb, California · 14913 days ago · 4 km deep · 4 km away
  60. 1.78 km WSW of Cobb, California · 14913 days ago · 3 km deep · 3 km away

The first 60 of 175.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc57314 (also filed as usp0002kzh). Read Tue, Sep 22, 2026, 5:23 PM UTC.