California earthquakes

M2.8 earthquake 4 km WSW of Cobb, California

A magnitude 2.8 earthquake struck 4 km WSW of Cobb, California on Thu, Aug 7, 1986, 8:30 AM PDT (15:30 UTC), 2 km (1 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
2.8 (md), micro
Local time
UTC
1986-08-07 15:30:34 UTC
Depth
2.0 km (1.2 mi), shallow
Epicenter
38.812° N, 122.774° 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, 0.3 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
45°
Stations used
31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 169 in the 60 days after this one and 100 in the 30 days before it.

After

  1. 2.27 km W of Cobb, California · 14664 days ago · 3 km deep · 3 km away
  2. 2.28 km W of Cobb, California · 14663 days ago · -1 km deep · 4 km away
  3. 1.95 km WSW of Cobb, California · 14663 days ago · 4 km deep · 2 km away
  4. 1.826 km NE of Potter Valley, California · 14663 days ago · 4 km deep · 77 km away
  5. 1.7Northern California · 14663 days ago · 0 km deep · 2 km away
  6. 1.71 km SE of Healdsburg, California · 14663 days ago · 35 km deep · 25 km away
  7. 1.86 km W of Cobb, California · 14663 days ago · 3 km deep · 2 km away
  8. 1.66 km W of Cobb, California · 14662 days ago · 3 km deep · 2 km away
  9. 1.85 km SW of Cobb, California · 14662 days ago · 1 km deep · 3 km away
  10. 2.14 km WSW of Cobb, California · 14662 days ago · 1 km deep · 1 km away
  11. 1.95 km SW of Cobb, California · 14661 days ago · 0 km deep · 2 km away
  12. 1.76 km SW of Cobb, California · 14661 days ago · -1 km deep · 2 km away
  13. 1.97 km WSW of Cobb, California · 14661 days ago · 2 km deep · 3 km away
  14. 2.25 km WSW of Cobb, California · 14661 days ago · 0 km deep · 2 km away
  15. 1.95 km SW of Cobb, California · 14661 days ago · 1 km deep · 2 km away
  16. 2.65 km SW of Cobb, California · 14661 days ago · 2 km deep · 3 km away
  17. 2.215 km SW of Williams, California · 14660 days ago · 15 km deep · 51 km away
  18. 1.67 km WSW of Cobb, California · 14660 days ago · 1 km deep · 3 km away
  19. 2.30 km S of Sea Ranch, California · 14658 days ago · 0 km deep · 60 km away
  20. 2.46 km SW of Cobb, California · 14658 days ago · 1 km deep · 3 km away
  21. 2.84 km WSW of Cobb, California · 14657 days ago · 1 km deep · 1 km away
  22. 1.77 km W of Cobb, California · 14657 days ago · 3 km deep · 3 km away
  23. 2.710 km NNE of Angwin, California · 14656 days ago · 7 km deep · 36 km away
  24. 2.18 km W of Cobb, California · 14656 days ago · 1 km deep · 4 km away
  25. 1.73 km S of Cobb, California · 14655 days ago · 1 km deep · 5 km away
  26. 2.86 km W of Cobb, California · 14655 days ago · 3 km deep · 2 km away
  27. 2.04 km N of Larkfield-Wikiup, California · 14654 days ago · 5 km deep · 29 km away
  28. 2.35 km SW of Cobb, California · 14653 days ago · 1 km deep · 3 km away
  29. 2.05 km SW of Cobb, California · 14652 days ago · 1 km deep · 3 km away
  30. 2.25 km SW of Cobb, California · 14651 days ago · 1 km deep · 3 km away
  31. 2.96 km W of Cobb, California · 14651 days ago · 3 km deep · 2 km away
  32. 2.67 km WSW of Cobb, California · 14650 days ago · 1 km deep · 3 km away
  33. 2.67 km NE of Cloverdale, California · 14649 days ago · 43 km deep · 17 km away
  34. 1.77 km W of Cobb, California · 14648 days ago · -1 km deep · 3 km away
  35. 2.08 km W of Cobb, California · 14648 days ago · 1 km deep · 4 km away
  36. 3.07 km NNW of Geyserville, California · 14648 days ago · 30 km deep · 15 km away
  37. 1.85 km W of Cobb, California · 14647 days ago · 0 km deep · 1 km away
  38. 2.33 km WNW of Cobb, California · 14647 days ago · 0 km deep · 2 km away
  39. 1.64 km W of Cobb, California · 14647 days ago · 2 km deep · 2 km away
  40. 2.03 km W of Cobb, California · 14647 days ago · 0 km deep · 2 km away
  41. 1.76 km W of Cobb, California · 14647 days ago · 3 km deep · 2 km away
  42. 1.87 km W of Cobb, California · 14647 days ago · 1 km deep · 3 km away
  43. 2.57 km W of Cobb, California · 14647 days ago · 0 km deep · 3 km away
  44. 2.17 km W of Cobb, California · 14647 days ago · 1 km deep · 3 km away
  45. 1.84 km SW of Cobb, California · 14646 days ago · 0 km deep · 2 km away
  46. 2.88 km ESE of Point Arena, California · 14646 days ago · -1 km deep · 73 km away
  47. 1.76 km W of Cobb, California · 14646 days ago · 1 km deep · 2 km away
  48. 2.05 km W of Cobb, California · 14646 days ago · 0 km deep · 1 km away
  49. 2.26 km SW of Cobb, California · 14646 days ago · 1 km deep · 4 km away
  50. 3.66 km E of Talmage, California · 14645 days ago · 4 km deep · 44 km away
  51. 1.75 km W of Middletown, California · 14645 days ago · 7 km deep · 10 km away
  52. 2.412 km NNE of Moskowite Corner, California · 14645 days ago · 14 km deep · 65 km away
  53. 1.97 km NNE of Madison, California · 14645 days ago · 9 km deep · 72 km away
  54. 1.70 km WNW of Redwood Valley, California · 14645 days ago · 6 km deep · 63 km away
  55. 1.64 km W of Cobb, California · 14645 days ago · 1 km deep · 1 km away
  56. 2.5Northern California · 14644 days ago · 12 km deep · 72 km away
  57. 2.07 km W of Cobb, California · 14644 days ago · 1 km deep · 3 km away
  58. 1.67 km W of Cobb, California · 14644 days ago · 3 km deep · 3 km away
  59. 1.64 km W of Cobb, California · 14644 days ago · 1 km deep · 1 km away
  60. 2.05 km WSW of Cobb, California · 14643 days ago · -1 km deep · 1 km away

The first 60 of 169.

Before

  1. 2.44 km WSW of Cobb, California · 14664 days ago · 1 km deep · 0 km away
  2. 2.15 km WNW of Cobb, California · 14665 days ago · 1 km deep · 3 km away
  3. 1.829 km WSW of Elk Creek, California · 14666 days ago · 13 km deep · 82 km away
  4. 1.911 km NE of Clearlake Oaks, California · 14666 days ago · 1 km deep · 37 km away
  5. 1.88 km WSW of Cobb, California · 14668 days ago · 4 km deep · 4 km away
  6. 1.64 km W of Cobb, California · 14668 days ago · 1 km deep · 2 km away
  7. 1.97 km NNE of Windsor, California · 14668 days ago · 2 km deep · 23 km away
  8. 1.717 km NNE of Angwin, California · 14669 days ago · 2 km deep · 36 km away
  9. 1.95 km SW of Cobb, California · 14669 days ago · 0 km deep · 2 km away
  10. 1.97 km W of Cobb, California · 14669 days ago · 3 km deep · 3 km away
  11. 1.61 km ESE of Larkfield-Wikiup, California · 14669 days ago · 4 km deep · 34 km away
  12. 1.61 km ESE of Clearlake, California · 14670 days ago · 4 km deep · 21 km away
  13. 2.25 km WSW of Cobb, California · 14670 days ago · 2 km deep · 0 km away
  14. 1.76 km WSW of Cobb, California · 14670 days ago · 1 km deep · 2 km away
  15. 1.74 km WSW of Cobb, California · 14670 days ago · 1 km deep · 1 km away
  16. 1.77 km W of Cobb, California · 14670 days ago · 3 km deep · 3 km away
  17. 1.64 km W of Cobb, California · 14670 days ago · 0 km deep · 1 km away
  18. 2.74 km W of Cobb, California · 14670 days ago · -1 km deep · 2 km away
  19. 2.67 km W of Cobb, California · 14671 days ago · 3 km deep · 3 km away
  20. 2.39 km SSW of Arbuckle, California · 14671 days ago · 0 km deep · 61 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc78426. Read Thu, Oct 1, 2026, 12:35 AM UTC.