California earthquakes

M1.7 earthquake 8 km WSW of Cobb, California

A magnitude 1.7 earthquake struck 8 km WSW of Cobb, California on Tue, Oct 15, 1985, 9:15 PM PDT (04:15 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M1.7 8 km NE of Hopland, 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
1.7 (md), micro
Local time
UTC
1985-10-16 04:15:03 UTC
Depth
4.0 km (2.5 mi), shallow
Epicenter
38.789° N, 122.806° 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
±0.16
Depth from
From location
Station coverage gap
66°
Stations used
23

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 176 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.78 km NE of Hopland, California · 14933 days ago · 5 km deep · 35 km away
  2. 1.81 km N of Calpella, California · 14932 days ago · 7 km deep · 62 km away
  3. 1.714 km NE of Potter Valley, California · 14932 days ago · 6 km deep · 69 km away
  4. 2.07 km WSW of Cobb, California · 14930 days ago · 2 km deep · 2 km away
  5. 2.36 km W of Cobb, California · 14930 days ago · 4 km deep · 4 km away
  6. 1.65 km WSW of Cobb, California · 14929 days ago · 0 km deep · 2 km away
  7. 1.57 km ENE of Penngrove, California · 14929 days ago · 8 km deep · 54 km away
  8. 1.83 km SW of Cobb, California · 14929 days ago · 1 km deep · 5 km away
  9. 1.84 km W of Upper Lake, California · 14929 days ago · 5 km deep · 44 km away
  10. 1.57 km W of Cobb, California · 14929 days ago · 3 km deep · 3 km away
  11. 2.23 km WSW of Green Valley, California · 14929 days ago · 7 km deep · 81 km away
  12. 1.91 km ENE of Green Valley, California · 14929 days ago · 12 km deep · 82 km away
  13. 1.91 km SW of Lakeport, California · 14929 days ago · 22 km deep · 29 km away
  14. 1.56 km W of Cobb, California · 14928 days ago · 3 km deep · 4 km away
  15. 2.07 km W of Cobb, California · 14928 days ago · 0 km deep · 4 km away
  16. 3.19 km W of Cobb, California · 14928 days ago · 1 km deep · 3 km away
  17. 3.09 km W of Cobb, California · 14928 days ago · -1 km deep · 5 km away
  18. 2.29 km W of Cobb, California · 14928 days ago · 1 km deep · 4 km away
  19. 2.09 km W of Cobb, California · 14928 days ago · 0 km deep · 4 km away
  20. 1.99 km W of Cobb, California · 14928 days ago · 0 km deep · 4 km away
  21. 2.48 km W of Cobb, California · 14928 days ago · 0 km deep · 3 km away
  22. 1.85 km WSW of Cobb, California · 14928 days ago · 1 km deep · 3 km away
  23. 1.75 km W of Cobb, California · 14928 days ago · 1 km deep · 4 km away
  24. 1.77 km W of Cobb, California · 14928 days ago · 3 km deep · 3 km away
  25. 1.56 km SW of Cobb, California · 14927 days ago · 0 km deep · 4 km away
  26. 1.823 km SE of Covelo, California · 14927 days ago · 5 km deep · 96 km away
  27. 2.06 km WSW of Calistoga, California · 14927 days ago · -1 km deep · 28 km away
  28. 2.07 km WSW of Calistoga, California · 14927 days ago · 0 km deep · 29 km away
  29. 1.85 km WNW of Cobb, California · 14926 days ago · 2 km deep · 6 km away
  30. 1.69 km W of Cobb, California · 14926 days ago · 0 km deep · 3 km away
  31. 1.75 km WSW of Cobb, California · 14925 days ago · 0 km deep · 3 km away
  32. 2.613 km N of Brooktrails, California · 14924 days ago · 9 km deep · 100 km away
  33. 1.96 km SW of Cobb, California · 14924 days ago · 1 km deep · 3 km away
  34. 1.75 km SW of Cobb, California · 14924 days ago · 0 km deep · 4 km away
  35. 4.15 km NW of Cobb, California · 14924 days ago · -1 km deep · 7 km away
  36. 1.65 km W of Robbins, California · 14924 days ago · 2 km deep · 90 km away
  37. 1.63 km WNW of Cobb, California · 14924 days ago · 0 km deep · 6 km away
  38. 1.86 km WSW of Cobb, California · 14923 days ago · 3 km deep · 2 km away
  39. 2.03 km WNW of Cobb, California · 14923 days ago · 0 km deep · 6 km away
  40. 1.513 km N of Brooktrails, California · 14923 days ago · 9 km deep · 100 km away
  41. 1.89 km E of Hopland, California · 14923 days ago · 2 km deep · 27 km away
  42. 2.15 km SW of Cobb, California · 14923 days ago · 1 km deep · 4 km away
  43. 1.66 km W of Cobb, California · 14922 days ago · 2 km deep · 3 km away
  44. 1.914 km E of Angwin, California · 14922 days ago · 1 km deep · 50 km away
  45. 2.17 km W of Cobb, California · 14922 days ago · 1 km deep · 4 km away
  46. 1.97 km W of Cobb, California · 14922 days ago · 1 km deep · 4 km away
  47. 1.76 km WSW of Calistoga, California · 14922 days ago · 1 km deep · 29 km away
  48. 1.66 km ENE of Brooktrails, California · 14921 days ago · 7 km deep · 88 km away
  49. 1.614 km ESE of Hidden Valley Lake, California · 14920 days ago · -1 km deep · 34 km away
  50. 1.66 km W of Cobb, California · 14920 days ago · 2 km deep · 3 km away
  51. 1.98 km W of Cobb, California · 14919 days ago · 1 km deep · 4 km away
  52. 1.84 km W of Cobb, California · 14919 days ago · 0 km deep · 4 km away
  53. 2.68 km W of Cobb, California · 14919 days ago · 1 km deep · 3 km away
  54. 1.98 km W of Lodoga, California · 14919 days ago · 4 km deep · 59 km away
  55. 1.51 km E of Knights Landing, California · 14918 days ago · 1 km deep · 96 km away
  56. 1.55 km SW of Cobb, California · 14918 days ago · 0 km deep · 3 km away
  57. 2.36 km W of Cobb, California · 14917 days ago · 3 km deep · 4 km away
  58. 1.5Northern California · 14917 days ago · 1 km deep · 3 km away
  59. 1.76 km W of Cobb, California · 14917 days ago · 3 km deep · 3 km away
  60. 1.79 km WSW of Cobb, California · 14916 days ago · 2 km deep · 2 km away

The first 60 of 176.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc57079. Read Tue, Sep 22, 2026, 4:09 PM UTC.