California earthquakes

M1.9 earthquake 6 km W of Cobb, California

A magnitude 1.9 earthquake struck 6 km W of Cobb, California on Thu, Aug 28, 1986, 8:25 PM PDT (03:25 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M4.5 26 km NE of Potter Valley, 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
1.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1986-08-29 03:25:43 UTC
Depth
0.7 km (0.4 mi), shallow
Epicenter
38.828° 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 0.5 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
177°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 162 in the 60 days after this one and 93 in the 30 days before it.

After

  1. 1.84 km SW of Glen Ellen, California · 14647 days ago · 5 km deep · 59 km away
  2. 1.97 km NNW of Redwood Valley, California · 14647 days ago · 2 km deep · 67 km away
  3. 2.12 km NNW of Larkfield-Wikiup, California · 14646 days ago · 8 km deep · 33 km away
  4. 1.79 km NNE of Larkfield-Wikiup, California · 14646 days ago · 4 km deep · 27 km away
  5. 2.08 km ESE of Hopland, California · 14646 days ago · 3 km deep · 23 km away
  6. 1.88 km W of Cobb, California · 14646 days ago · 2 km deep · 2 km away
  7. 1.710 km W of Cobb, California · 14646 days ago · -1 km deep · 3 km away
  8. 2.05 km WSW of Cobb, California · 14646 days ago · 0 km deep · 3 km away
  9. 1.75 km WSW of Cobb, California · 14646 days ago · 0 km deep · 3 km away
  10. 1.66 km WSW of Cobb, California · 14646 days ago · 1 km deep · 3 km away
  11. 2.56 km W of Cobb, California · 14645 days ago · 3 km deep · 1 km away
  12. 1.96 km WSW of Cobb, California · 14645 days ago · 0 km deep · 2 km away
  13. 1.55 km SW of Cobb, California · 14645 days ago · 0 km deep · 5 km away
  14. 2.115 km NNE of Angwin, California · 14643 days ago · 4 km deep · 38 km away
  15. 2.63 km WNW of Cobb, California · 14643 days ago · 0 km deep · 4 km away
  16. 2.13 km WNW of Cobb, California · 14643 days ago · 0 km deep · 4 km away
  17. 2.73 km WNW of Cobb, California · 14643 days ago · 0 km deep · 4 km away
  18. 1.75 km SW of Cobb, California · 14643 days ago · 0 km deep · 6 km away
  19. 1.86 km W of Cobb, California · 14642 days ago · 3 km deep · 1 km away
  20. 3.122 km W of Elk Creek, California · 14642 days ago · 30 km deep · 84 km away
  21. 2.35 km WSW of Cobb, California · 14642 days ago · -1 km deep · 4 km away
  22. 1.96 km WSW of Cobb, California · 14642 days ago · 0 km deep · 4 km away
  23. 1.66 km ENE of Larkfield-Wikiup, California · 14642 days ago · 4 km deep · 35 km away
  24. 1.55 km WSW of Cobb, California · 14642 days ago · 1 km deep · 4 km away
  25. 2.85 km SW of Cobb, California · 14642 days ago · 0 km deep · 5 km away
  26. 2.32 km WNW of Cobb, California · 14642 days ago · -1 km deep · 5 km away
  27. 1.75 km SW of Cobb, California · 14641 days ago · 2 km deep · 4 km away
  28. 1.913 km SE of Hidden Valley Lake, California · 14641 days ago · 5 km deep · 34 km away
  29. 1.66 km W of Cobb, California · 14641 days ago · 3 km deep · 1 km away
  30. 2.55 km SW of Cobb, California · 14641 days ago · 0 km deep · 6 km away
  31. 1.74 km W of Cobb, California · 14640 days ago · 1 km deep · 2 km away
  32. 2.37 km W of Cobb, California · 14640 days ago · 0 km deep · 1 km away
  33. 2.94 km S of Cobb, California · 14640 days ago · 1 km deep · 8 km away
  34. 1.83 km S of Cobb, California · 14640 days ago · 1 km deep · 8 km away
  35. 3.46 km W of Cobb, California · 14640 days ago · 1 km deep · 1 km away
  36. 3.46 km W of Cobb, California · 14640 days ago · -1 km deep · 1 km away
  37. 1.76 km W of Cobb, California · 14640 days ago · 3 km deep · 1 km away
  38. 1.52 km NW of Larkfield-Wikiup, California · 14638 days ago · 3 km deep · 33 km away
  39. 1.84 km W of Cobb, California · 14638 days ago · 0 km deep · 2 km away
  40. 1.95 km SW of Cobb, California · 14638 days ago · 2 km deep · 4 km away
  41. 1.922 km NNE of Upper Lake, California · 14638 days ago · 13 km deep · 59 km away
  42. 2.03 km WNW of Cobb, California · 14636 days ago · 0 km deep · 3 km away
  43. 1.710 km E of Calpella, California · 14636 days ago · 2 km deep · 50 km away
  44. 2.03 km W of Forestville, California · 14636 days ago · 0 km deep · 41 km away
  45. 1.75 km WNW of Cobb, California · 14636 days ago · 1 km deep · 2 km away
  46. 1.64 km W of Brooktrails, California · 14636 days ago · 4 km deep · 88 km away
  47. 1.97 km WSW of Cobb, California · 14635 days ago · 2 km deep · 2 km away
  48. 2.018 km NE of Upper Lake, California · 14635 days ago · 4 km deep · 53 km away
  49. 4.526 km NE of Potter Valley, California · 14634 days ago · 4 km deep · 71 km away
  50. 1.611 km WSW of Cloverdale, California · 14633 days ago · 4 km deep · 30 km away
  51. 2.26 km W of Cobb, California · 14633 days ago · 1 km deep · 0 km away
  52. 2.04 km WSW of Cobb, California · 14633 days ago · 1 km deep · 3 km away
  53. 2.22 km NNW of Talmage, California · 14632 days ago · -1 km deep · 49 km away
  54. 2.05 km WNW of Cobb, California · 14632 days ago · 2 km deep · 3 km away
  55. 2.07 km WSW of Cobb, California · 14632 days ago · 3 km deep · 4 km away
  56. 2.47 km W of Cobb, California · 14632 days ago · 2 km deep · 1 km away
  57. 1.77 km W of Cobb, California · 14632 days ago · 3 km deep · 1 km away
  58. 2.45 km SW of Cobb, California · 14632 days ago · 0 km deep · 5 km away
  59. 2.05 km WSW of Cobb, California · 14631 days ago · -1 km deep · 4 km away
  60. 2.0Northern California · 14631 days ago · 3 km deep · 1 km away

The first 60 of 162.

Before

  1. 1.76 km SW of Cobb, California · 14647 days ago · 0 km deep · 5 km away
  2. 1.64 km SW of Cobb, California · 14647 days ago · -1 km deep · 6 km away
  3. 2.05 km WSW of Cobb, California · 14648 days ago · -1 km deep · 3 km away
  4. 1.64 km W of Cobb, California · 14648 days ago · 1 km deep · 2 km away
  5. 1.67 km W of Cobb, California · 14648 days ago · 3 km deep · 1 km away
  6. 2.07 km W of Cobb, California · 14648 days ago · 1 km deep · 2 km away
  7. 2.5Northern California · 14649 days ago · 12 km deep · 74 km away
  8. 1.64 km W of Cobb, California · 14649 days ago · 1 km deep · 2 km away
  9. 1.70 km WNW of Redwood Valley, California · 14649 days ago · 6 km deep · 61 km away
  10. 1.97 km NNE of Madison, California · 14649 days ago · 9 km deep · 75 km away
  11. 2.412 km NNE of Moskowite Corner, California · 14649 days ago · 14 km deep · 68 km away
  12. 1.75 km W of Middletown, California · 14650 days ago · 7 km deep · 13 km away
  13. 3.66 km E of Talmage, California · 14650 days ago · 4 km deep · 42 km away
  14. 2.26 km SW of Cobb, California · 14650 days ago · 1 km deep · 6 km away
  15. 2.05 km W of Cobb, California · 14650 days ago · 0 km deep · 2 km away
  16. 1.76 km W of Cobb, California · 14650 days ago · 1 km deep · 1 km away
  17. 2.88 km ESE of Point Arena, California · 14650 days ago · -1 km deep · 70 km away
  18. 1.84 km SW of Cobb, California · 14651 days ago · 0 km deep · 5 km away
  19. 2.17 km W of Cobb, California · 14651 days ago · 1 km deep · 1 km away
  20. 2.57 km W of Cobb, California · 14651 days ago · 0 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1142971. Read Mon, Oct 5, 2026, 7:47 AM UTC.