California earthquakes

M1.7 earthquake 6 km W of Cobb, California

A magnitude 1.7 earthquake struck 6 km W of Cobb, California on Mon, Apr 8, 1985, 6:52 PM PST (02:52 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.3 7 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
1.7 (md), micro
Local time
UTC
1985-04-09 02:52:19 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
38.823° N, 122.802° 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
±0.21
Depth from
From location
Station coverage gap
48°
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: 182 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.64 km SW of Hopland, California · 15129 days ago · 5 km deep · 34 km away
  2. 2.37 km WSW of Cobb, California · 15128 days ago · 4 km deep · 3 km away
  3. 1.66 km W of Cobb, California · 15128 days ago · 1 km deep · 1 km away
  4. 1.78 km WSW of Cobb, California · 15127 days ago · 3 km deep · 3 km away
  5. 1.85 km NNW of Geyserville, California · 15127 days ago · 5 km deep · 14 km away
  6. 1.97 km WSW of Cobb, California · 15125 days ago · 2 km deep · 3 km away
  7. 1.97 km WSW of Cobb, California · 15124 days ago · 1 km deep · 2 km away
  8. 2.16 km W of Cobb, California · 15124 days ago · 3 km deep · 1 km away
  9. 2.06 km W of Cobb, California · 15124 days ago · 3 km deep · 1 km away
  10. 2.28 km WSW of Cobb, California · 15123 days ago · 3 km deep · 3 km away
  11. 1.76 km NE of Brooktrails, California · 15123 days ago · 6 km deep · 86 km away
  12. 1.7Northern California · 15122 days ago · 2 km deep · 3 km away
  13. 2.1Northern California · 15122 days ago · 2 km deep · 30 km away
  14. 2.74 km W of Cobb, California · 15122 days ago · 0 km deep · 2 km away
  15. 1.66 km W of Cobb, California · 15122 days ago · -1 km deep · 1 km away
  16. 1.66 km W of Cobb, California · 15122 days ago · -1 km deep · 1 km away
  17. 1.69 km W of Cobb, California · 15122 days ago · 1 km deep · 3 km away
  18. 1.59 km W of Cobb, California · 15122 days ago · 1 km deep · 3 km away
  19. 1.77 km WSW of Cobb, California · 15121 days ago · 1 km deep · 2 km away
  20. 2.45 km SW of Cobb, California · 15121 days ago · 0 km deep · 4 km away
  21. 2.06 km WNW of Guinda, California · 15121 days ago · 3 km deep · 47 km away
  22. 1.85 km SW of Cobb, California · 15121 days ago · 2 km deep · 4 km away
  23. 1.77 km WSW of Cobb, California · 15121 days ago · 1 km deep · 2 km away
  24. 2.55 km WSW of Cobb, California · 15120 days ago · 3 km deep · 4 km away
  25. 2.57 km SW of Meridian, California · 15120 days ago · 10 km deep · 77 km away
  26. 2.16 km W of Cobb, California · 15120 days ago · 3 km deep · 0 km away
  27. 1.77 km W of Cobb, California · 15119 days ago · 1 km deep · 2 km away
  28. 1.85 km ESE of Willits, California · 15119 days ago · 0 km deep · 76 km away
  29. 2.321 km WSW of Williams, California · 15119 days ago · 0 km deep · 47 km away
  30. 1.85 km W of Angwin, California · 15117 days ago · 8 km deep · 37 km away
  31. 1.86 km W of Cobb, California · 15117 days ago · -1 km deep · 1 km away
  32. 2.15 km SSW of Cobb, California · 15116 days ago · 1 km deep · 6 km away
  33. 1.712 km WNW of Cobb, California · 15116 days ago · 1 km deep · 6 km away
  34. 1.610 km NW of Cobb, California · 15115 days ago · 2 km deep · 6 km away
  35. 1.67 km W of Cobb, California · 15115 days ago · 3 km deep · 1 km away
  36. 1.6Northern California · 15114 days ago · 3 km deep · 0 km away
  37. 1.54 km S of Cobb, California · 15114 days ago · 2 km deep · 8 km away
  38. 1.88 km W of Cobb, California · 15113 days ago · 1 km deep · 2 km away
  39. 1.68 km W of Cobb, California · 15113 days ago · 1 km deep · 2 km away
  40. 1.86 km W of Cobb, California · 15112 days ago · 0 km deep · 0 km away
  41. 2.36 km W of Cobb, California · 15112 days ago · 0 km deep · 0 km away
  42. 1.56 km W of Cobb, California · 15112 days ago · 0 km deep · 1 km away
  43. 1.69 km WSW of Cobb, California · 15111 days ago · 2 km deep · 3 km away
  44. 1.57 km WSW of Cobb, California · 15111 days ago · 2 km deep · 2 km away
  45. 1.55 km SW of Cobb, California · 15110 days ago · 0 km deep · 5 km away
  46. 2.36 km W of Cobb, California · 15110 days ago · 2 km deep · 1 km away
  47. 2.27 km W of Cobb, California · 15110 days ago · 2 km deep · 2 km away
  48. 2.14 km WSW of Cobb, California · 15110 days ago · 1 km deep · 3 km away
  49. 2.86 km WSW of Cobb, California · 15109 days ago · 0 km deep · 3 km away
  50. 2.27 km WSW of Cobb, California · 15109 days ago · 1 km deep · 2 km away
  51. 2.16 km W of Cobb, California · 15109 days ago · 3 km deep · 1 km away
  52. 1.86 km W of Cobb, California · 15108 days ago · 3 km deep · 0 km away
  53. 1.97 km W of Cobb, California · 15107 days ago · 1 km deep · 1 km away
  54. 2.15 km ENE of Calpella, California · 15107 days ago · 6 km deep · 56 km away
  55. 2.13 km SW of Cobb, California · 15107 days ago · 1 km deep · 6 km away
  56. 1.619 km E of Potter Valley, California · 15107 days ago · 5 km deep · 59 km away
  57. 2.17 km WSW of Cobb, California · 15107 days ago · 1 km deep · 2 km away
  58. 1.94 km ENE of Calpella, California · 15107 days ago · 0 km deep · 56 km away
  59. 2.67 km W of Cobb, California · 15106 days ago · 3 km deep · 1 km away
  60. 1.68 km WSW of Cobb, California · 15106 days ago · 3 km deep · 3 km away

The first 60 of 182.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc45690. Read Tue, Sep 22, 2026, 8:23 PM UTC.