California earthquakes

M2.8 earthquake 5 km SW of Cobb, California

A magnitude 2.8 earthquake struck 5 km SW of Cobb, California on Wed, Sep 3, 1986, 5:10 AM PDT (12:10 UTC), 0 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
2.8 (md), micro
Local time
UTC
1986-09-03 12:10:33 UTC
Depth
0.1 km (0.1 mi), shallow
Epicenter
38.786° N, 122.768° 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, 0.4 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
41°
Stations used
29

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 148 in the 60 days after this one and 93 in the 30 days before it.

After

  1. 2.32 km WNW of Cobb, California · 14636 days ago · -1 km deep · 5 km away
  2. 1.75 km SW of Cobb, California · 14636 days ago · 2 km deep · 1 km away
  3. 1.913 km SE of Hidden Valley Lake, California · 14635 days ago · 5 km deep · 30 km away
  4. 1.66 km W of Cobb, California · 14635 days ago · 3 km deep · 4 km away
  5. 2.55 km SW of Cobb, California · 14635 days ago · 0 km deep · 1 km away
  6. 1.74 km W of Cobb, California · 14635 days ago · 1 km deep · 4 km away
  7. 2.37 km W of Cobb, California · 14634 days ago · 0 km deep · 5 km away
  8. 2.94 km S of Cobb, California · 14634 days ago · 1 km deep · 4 km away
  9. 1.83 km S of Cobb, California · 14634 days ago · 1 km deep · 4 km away
  10. 3.46 km W of Cobb, California · 14634 days ago · 1 km deep · 4 km away
  11. 3.46 km W of Cobb, California · 14634 days ago · -1 km deep · 5 km away
  12. 1.76 km W of Cobb, California · 14634 days ago · 3 km deep · 4 km away
  13. 1.52 km NW of Larkfield-Wikiup, California · 14632 days ago · 3 km deep · 28 km away
  14. 1.84 km W of Cobb, California · 14632 days ago · 0 km deep · 4 km away
  15. 1.95 km SW of Cobb, California · 14632 days ago · 2 km deep · 1 km away
  16. 1.922 km NNE of Upper Lake, California · 14632 days ago · 13 km deep · 63 km away
  17. 2.03 km WNW of Cobb, California · 14631 days ago · 0 km deep · 5 km away
  18. 1.710 km E of Calpella, California · 14631 days ago · 2 km deep · 55 km away
  19. 2.03 km W of Forestville, California · 14631 days ago · 0 km deep · 38 km away
  20. 1.75 km WNW of Cobb, California · 14630 days ago · 1 km deep · 6 km away
  21. 1.64 km W of Brooktrails, California · 14630 days ago · 4 km deep · 94 km away
  22. 1.97 km WSW of Cobb, California · 14629 days ago · 2 km deep · 4 km away
  23. 2.018 km NE of Upper Lake, California · 14629 days ago · 4 km deep · 57 km away
  24. 4.526 km NE of Potter Valley, California · 14628 days ago · 4 km deep · 76 km away
  25. 1.611 km WSW of Cloverdale, California · 14628 days ago · 4 km deep · 31 km away
  26. 2.26 km W of Cobb, California · 14628 days ago · 1 km deep · 5 km away
  27. 2.04 km WSW of Cobb, California · 14628 days ago · 1 km deep · 3 km away
  28. 2.22 km NNW of Talmage, California · 14627 days ago · -1 km deep · 54 km away
  29. 2.05 km WNW of Cobb, California · 14626 days ago · 2 km deep · 6 km away
  30. 2.07 km WSW of Cobb, California · 14626 days ago · 3 km deep · 4 km away
  31. 2.47 km W of Cobb, California · 14626 days ago · 2 km deep · 5 km away
  32. 1.77 km W of Cobb, California · 14626 days ago · 3 km deep · 5 km away
  33. 2.45 km SW of Cobb, California · 14626 days ago · 0 km deep · 1 km away
  34. 2.05 km WSW of Cobb, California · 14626 days ago · -1 km deep · 2 km away
  35. 2.0Northern California · 14625 days ago · 3 km deep · 5 km away
  36. 2.04 km WNW of Cobb, California · 14625 days ago · 2 km deep · 6 km away
  37. 1.73 km WNW of Nice, California · 14624 days ago · 4 km deep · 39 km away
  38. 1.75 km ESE of Talmage, California · 14623 days ago · 10 km deep · 47 km away
  39. 1.85 km WSW of Cobb, California · 14623 days ago · 0 km deep · 1 km away
  40. 1.68 km W of Cobb, California · 14623 days ago · 2 km deep · 6 km away
  41. 1.52 km NE of Ukiah, California · 14623 days ago · 16 km deep · 55 km away
  42. 1.67 km WSW of Cobb, California · 14623 days ago · 1 km deep · 4 km away
  43. 2.18 km NE of Lucerne, California · 14623 days ago · 1 km deep · 39 km away
  44. 1.58 km WSW of Cobb, California · 14622 days ago · 3 km deep · 4 km away
  45. 3.08 km WSW of Cobb, California · 14620 days ago · 4 km deep · 4 km away
  46. 1.87 km WSW of Cobb, California · 14620 days ago · 3 km deep · 3 km away
  47. 2.26 km W of Cobb, California · 14620 days ago · 2 km deep · 5 km away
  48. 2.55 km S of Boonville, California · 14620 days ago · 1 km deep · 56 km away
  49. 1.80 km WSW of Geyserville, California · 14619 days ago · 7 km deep · 15 km away
  50. 2.66 km WSW of Cobb, California · 14619 days ago · 1 km deep · 2 km away
  51. 1.80 km SSW of Geyserville, California · 14619 days ago · 8 km deep · 15 km away
  52. 1.97 km W of Cobb, California · 14619 days ago · 3 km deep · 5 km away
  53. 2.914 km SSW of Cloverdale, California · 14617 days ago · 17 km deep · 30 km away
  54. 2.69 km SW of Cobb, California · 14616 days ago · 5 km deep · 4 km away
  55. 2.68 km W of Cobb, California · 14615 days ago · -1 km deep · 5 km away
  56. 1.97 km W of Cobb, California · 14615 days ago · 0 km deep · 4 km away
  57. 1.514 km E of Angwin, California · 14614 days ago · 4 km deep · 49 km away
  58. 1.615 km WSW of Cloverdale, California · 14614 days ago · 1 km deep · 37 km away
  59. 2.120 km ENE of Potter Valley, California · 14614 days ago · 4 km deep · 67 km away
  60. 1.76 km W of Cobb, California · 14614 days ago · 3 km deep · 4 km away

The first 60 of 148.

Before

  1. 1.55 km WSW of Cobb, California · 14636 days ago · 1 km deep · 2 km away
  2. 1.66 km ENE of Larkfield-Wikiup, California · 14636 days ago · 4 km deep · 30 km away
  3. 1.96 km WSW of Cobb, California · 14637 days ago · 0 km deep · 1 km away
  4. 2.35 km WSW of Cobb, California · 14637 days ago · -1 km deep · 1 km away
  5. 3.122 km W of Elk Creek, California · 14637 days ago · 30 km deep · 88 km away
  6. 1.86 km W of Cobb, California · 14637 days ago · 3 km deep · 4 km away
  7. 1.75 km SW of Cobb, California · 14637 days ago · 0 km deep · 1 km away
  8. 2.73 km WNW of Cobb, California · 14637 days ago · 0 km deep · 6 km away
  9. 2.13 km WNW of Cobb, California · 14637 days ago · 0 km deep · 5 km away
  10. 2.63 km WNW of Cobb, California · 14637 days ago · 0 km deep · 5 km away
  11. 2.115 km NNE of Angwin, California · 14638 days ago · 4 km deep · 33 km away
  12. 1.55 km SW of Cobb, California · 14639 days ago · 0 km deep · 1 km away
  13. 1.96 km WSW of Cobb, California · 14639 days ago · 0 km deep · 3 km away
  14. 2.56 km W of Cobb, California · 14640 days ago · 3 km deep · 5 km away
  15. 1.66 km WSW of Cobb, California · 14640 days ago · 1 km deep · 3 km away
  16. 1.75 km WSW of Cobb, California · 14641 days ago · 0 km deep · 2 km away
  17. 2.05 km WSW of Cobb, California · 14641 days ago · 0 km deep · 2 km away
  18. 1.710 km W of Cobb, California · 14641 days ago · -1 km deep · 7 km away
  19. 1.88 km W of Cobb, California · 14641 days ago · 2 km deep · 5 km away
  20. 2.08 km ESE of Hopland, California · 14641 days ago · 3 km deep · 28 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc81089. Read Tue, Sep 29, 2026, 4:03 PM UTC.