California earthquakes

M2.9 earthquake 7 km W of Cobb, CA

A magnitude 2.9 earthquake struck 7 km W of Cobb, CA on Sun, Sep 28, 1986, 8:05 AM PDT (15:05 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M4.0 4 km SW of Sea Ranch, 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
2.9 (md), micro
Local time
UTC
1986-09-28 15:05:04 UTC
Depth
0.9 km (0.6 mi), shallow
Epicenter
38.825° N, 122.799° 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 0.3 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
52°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 152 in the 60 days after this one and 88 in the 30 days before it.

After

  1. 1.9Northern California · 14612 days ago · 1 km deep · 0 km away
  2. 2.86 km WSW of Cobb, California · 14612 days ago · 1 km deep · 2 km away
  3. 1.95 km E of Penngrove, California · 14612 days ago · 4 km deep · 60 km away
  4. 2.66 km W of Cobb, California · 14611 days ago · 3 km deep · 1 km away
  5. 1.97 km W of Cobb, California · 14610 days ago · 3 km deep · 1 km away
  6. 2.26 km WSW of Cobb, California · 14610 days ago · 0 km deep · 2 km away
  7. 2.44 km WSW of Lakeport, California · 14610 days ago · 14 km deep · 26 km away
  8. 2.26 km SSW of Kelseyville, California · 14610 days ago · 39 km deep · 12 km away
  9. 1.84 km WSW of Cobb, California · 14610 days ago · -1 km deep · 2 km away
  10. 2.47 km W of Cobb, California · 14609 days ago · 1 km deep · 1 km away
  11. 1.97 km W of Cobb, California · 14609 days ago · 1 km deep · 1 km away
  12. 1.95 km WSW of Cobb, California · 14609 days ago · 2 km deep · 3 km away
  13. 2.15 km WSW of Cobb, California · 14609 days ago · -1 km deep · 4 km away
  14. 2.024 km NNE of Potter Valley, California · 14609 days ago · 8 km deep · 79 km away
  15. 2.25 km E of Redwood Valley, California · 14609 days ago · 1 km deep · 56 km away
  16. 1.514 km ESE of Hidden Valley Lake, California · 14608 days ago · 3 km deep · 34 km away
  17. 3.020 km ENE of Potter Valley, California · 14608 days ago · 14 km deep · 61 km away
  18. 1.919 km ENE of Potter Valley, California · 14608 days ago · 4 km deep · 62 km away
  19. 2.615 km ENE of Potter Valley, California · 14607 days ago · 6 km deep · 60 km away
  20. 2.36 km W of Cobb, California · 14606 days ago · 2 km deep · 0 km away
  21. 2.19 km WNW of Bolinas, California · 14605 days ago · 7 km deep · 98 km away
  22. 1.94 km E of Santa Rosa, California · 14605 days ago · 8 km deep · 45 km away
  23. 2.04 km NE of Windsor, California · 14605 days ago · 0 km deep · 27 km away
  24. 2.01 km WSW of Angwin, California · 14605 days ago · 4 km deep · 40 km away
  25. 2.16 km W of Cobb, California · 14604 days ago · 2 km deep · 1 km away
  26. 2.86 km W of Cobb, California · 14604 days ago · 2 km deep · 1 km away
  27. 2.06 km W of Cobb, California · 14604 days ago · 2 km deep · 1 km away
  28. 1.77 km WSW of Cobb, California · 14604 days ago · 3 km deep · 4 km away
  29. 2.110 km N of Cloverdale, California · 14604 days ago · 4 km deep · 21 km away
  30. 1.813 km S of Comptche, California · 14603 days ago · 2 km deep · 77 km away
  31. 1.6Northern California · 14603 days ago · 0 km deep · 4 km away
  32. 1.86 km W of Cobb, California · 14603 days ago · 3 km deep · 1 km away
  33. 1.67 km W of Cobb, California · 14603 days ago · 3 km deep · 1 km away
  34. 2.05 km SW of Cobb, California · 14602 days ago · 1 km deep · 5 km away
  35. 1.714 km NE of Willits, California · 14600 days ago · 4 km deep · 82 km away
  36. 1.64 km W of Angwin, California · 14600 days ago · 4 km deep · 38 km away
  37. 2.617 km SSE of Covelo, California · 14600 days ago · 4 km deep · 97 km away
  38. 1.99 km SSW of Lodoga, California · 14600 days ago · 20 km deep · 50 km away
  39. 1.65 km SW of Cobb, California · 14599 days ago · 3 km deep · 4 km away
  40. 4.04 km SW of Sea Ranch, California · 14598 days ago · 6 km deep · 62 km away
  41. 2.01 km W of Sea Ranch, California · 14598 days ago · 4 km deep · 60 km away
  42. 1.57 km SSW of Clear Lake Riviera, California · 14598 days ago · 4 km deep · 9 km away
  43. 1.77 km WSW of Cobb, California · 14598 days ago · 4 km deep · 3 km away
  44. 1.57 km W of Cobb, California · 14598 days ago · 2 km deep · 2 km away
  45. 1.77 km W of Cobb, California · 14596 days ago · 3 km deep · 1 km away
  46. 2.05 km WSW of Cobb, California · 14595 days ago · -1 km deep · 3 km away
  47. 1.63 km W of Geyserville, California · 14592 days ago · 2 km deep · 18 km away
  48. 1.810 km ENE of Hidden Valley Lake, California · 14592 days ago · 5 km deep · 30 km away
  49. 1.98 km NNE of Geyserville, California · 14592 days ago · 13 km deep · 8 km away
  50. 2.67 km W of Cobb, California · 14592 days ago · 4 km deep · 1 km away
  51. 1.818 km NNE of Upper Lake, California · 14592 days ago · 0 km deep · 54 km away
  52. 2.218 km NNE of Upper Lake, California · 14592 days ago · 7 km deep · 53 km away
  53. 1.61 km WSW of Kelseyville, California · 14592 days ago · 3 km deep · 17 km away
  54. 1.611 km N of Cloverdale, California · 14592 days ago · 1 km deep · 20 km away
  55. 2.86 km W of Cobb, California · 14591 days ago · 4 km deep · 0 km away
  56. 1.96 km W of Cobb, California · 14591 days ago · 3 km deep · 0 km away
  57. 2.67 km NNE of Hopland, California · 14591 days ago · 2 km deep · 34 km away
  58. 1.99 km WSW of Cobb, California · 14590 days ago · 1 km deep · 3 km away
  59. 1.86 km W of Cobb, California · 14590 days ago · 3 km deep · 1 km away
  60. 2.35 km SW of Cobb, California · 14590 days ago · 1 km deep · 6 km away

The first 60 of 152.

Before

  1. 1.67 km W of Cobb, California · 14613 days ago · 3 km deep · 2 km away
  2. 2.56 km NE of Talmage, California · 14614 days ago · 0 km deep · 48 km away
  3. 2.14 km W of Cobb, California · 14614 days ago · 0 km deep · 2 km away
  4. 1.69 km W of Cobb, California · 14614 days ago · 2 km deep · 3 km away
  5. 1.66 km W of Cobb, California · 14614 days ago · 3 km deep · 1 km away
  6. 1.76 km W of Cobb, California · 14615 days ago · 3 km deep · 1 km away
  7. 2.120 km ENE of Potter Valley, California · 14615 days ago · 4 km deep · 63 km away
  8. 1.615 km WSW of Cloverdale, California · 14615 days ago · 1 km deep · 35 km away
  9. 1.514 km E of Angwin, California · 14616 days ago · 4 km deep · 53 km away
  10. 1.97 km W of Cobb, California · 14616 days ago · 0 km deep · 2 km away
  11. 2.68 km W of Cobb, California · 14616 days ago · -1 km deep · 2 km away
  12. 2.69 km SW of Cobb, California · 14617 days ago · 5 km deep · 8 km away
  13. 2.914 km SSW of Cloverdale, California · 14618 days ago · 17 km deep · 29 km away
  14. 1.97 km W of Cobb, California · 14620 days ago · 3 km deep · 2 km away
  15. 1.80 km SSW of Geyserville, California · 14620 days ago · 8 km deep · 17 km away
  16. 2.66 km WSW of Cobb, California · 14620 days ago · 1 km deep · 4 km away
  17. 1.80 km WSW of Geyserville, California · 14620 days ago · 7 km deep · 16 km away
  18. 2.55 km S of Boonville, California · 14621 days ago · 1 km deep · 52 km away
  19. 2.26 km W of Cobb, California · 14621 days ago · 2 km deep · 0 km away
  20. 1.87 km WSW of Cobb, California · 14621 days ago · 3 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc84012. Read Wed, Sep 30, 2026, 5:15 PM UTC.