California earthquakes

M3.1 earthquake 7 km W of Cobb, California

A magnitude 3.1 earthquake struck 7 km W of Cobb, California on Wed, Dec 31, 1986, 10:33 AM PST (18:33 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.4 5 km SW 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
3.1 (ml), minor
Local time
UTC
1986-12-31 18:33:48 UTC
Depth
1.3 km (0.8 mi), shallow
Epicenter
38.820° N, 122.808° 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
Depth from
From location
Station coverage gap
34°
Stations used
45

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 171 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.74 km WNW of Cobb, California · 14504 days ago · 2 km deep · 3 km away
  2. 2.04 km WSW of North Lakeport, California · 14504 days ago · 4 km deep · 31 km away
  3. 3.45 km SW of Cobb, California · 14503 days ago · 0 km deep · 4 km away
  4. 1.96 km SW of Cobb, California · 14503 days ago · 1 km deep · 5 km away
  5. 2.64 km NNW of Benicia, California · 14502 days ago · 11 km deep · 98 km away
  6. 1.64 km NNE of Crockett, California · 14502 days ago · 7 km deep · 97 km away
  7. 1.74 km NNE of Crockett, California · 14502 days ago · 8 km deep · 98 km away
  8. 2.47 km E of Hidden Valley Lake, California · 14501 days ago · 8 km deep · 29 km away
  9. 2.14 km WSW of Cobb, California · 14501 days ago · 1 km deep · 3 km away
  10. 1.75 km ESE of Talmage, California · 14501 days ago · 5 km deep · 42 km away
  11. 1.54 km N of Port Costa, California · 14501 days ago · 13 km deep · 98 km away
  12. 1.87 km NW of Yolo, California · 14500 days ago · 5 km deep · 82 km away
  13. 2.75 km W of Cobb, California · 14500 days ago · 1 km deep · 3 km away
  14. 2.36 km WSW of Cobb, California · 14500 days ago · 2 km deep · 2 km away
  15. 1.59 km ESE of Hidden Valley Lake, California · 14500 days ago · 7 km deep · 31 km away
  16. 2.23 km N of Port Costa, California · 14499 days ago · 8 km deep · 99 km away
  17. 1.74 km WSW of Cobb, California · 14499 days ago · 1 km deep · 3 km away
  18. 1.65 km WSW of Cobb, California · 14498 days ago · 1 km deep · 3 km away
  19. 1.64 km WNW of Cobb, California · 14498 days ago · 2 km deep · 3 km away
  20. 1.68 km W of Cobb, California · 14497 days ago · 2 km deep · 1 km away
  21. 2.28 km ENE of Hopland, California · 14497 days ago · 6 km deep · 28 km away
  22. 1.73 km SW of Cobb, California · 14496 days ago · 1 km deep · 6 km away
  23. 1.66 km W of Cobb, California · 14496 days ago · 2 km deep · 1 km away
  24. 1.98 km WSW of Cobb, California · 14496 days ago · 3 km deep · 3 km away
  25. 1.710 km NNW of Redwood Valley, California · 14495 days ago · 4 km deep · 70 km away
  26. 2.82 km E of Rohnert Park, California · 14495 days ago · 5 km deep · 54 km away
  27. 2.13 km ESE of Rohnert Park, California · 14495 days ago · 0 km deep · 56 km away
  28. 1.710 km SSW of Cloverdale, California · 14495 days ago · 30 km deep · 25 km away
  29. 1.82 km E of Rohnert Park, California · 14495 days ago · 3 km deep · 55 km away
  30. 1.77 km E of Hidden Valley Lake, California · 14495 days ago · 8 km deep · 29 km away
  31. 2.97 km W of Cobb, California · 14495 days ago · 4 km deep · 1 km away
  32. 2.47 km W of Cobb, California · 14495 days ago · 4 km deep · 0 km away
  33. 2.82 km ENE of Rohnert Park, California · 14495 days ago · 6 km deep · 54 km away
  34. 2.010 km E of Hidden Valley Lake, California · 14495 days ago · 10 km deep · 31 km away
  35. 1.91 km ENE of Rohnert Park, California · 14495 days ago · 3 km deep · 54 km away
  36. 2.27 km E of Hidden Valley Lake, California · 14495 days ago · 8 km deep · 29 km away
  37. 2.02 km ENE of Rohnert Park, California · 14494 days ago · 3 km deep · 54 km away
  38. 1.86 km NE of Windsor, California · 14494 days ago · 3 km deep · 26 km away
  39. 1.61 km E of Roseland, California · 14494 days ago · 17 km deep · 45 km away
  40. 1.62 km ENE of Penngrove, California · 14494 days ago · 0 km deep · 59 km away
  41. 1.56 km E of Cloverdale, California · 14494 days ago · 0 km deep · 12 km away
  42. 1.66 km W of Cobb, California · 14493 days ago · 2 km deep · 1 km away
  43. 1.75 km SW of Cobb, California · 14493 days ago · 1 km deep · 5 km away
  44. 1.76 km W of Cobb, California · 14492 days ago · 2 km deep · 2 km away
  45. 1.86 km W of Cobb, California · 14492 days ago · 3 km deep · 1 km away
  46. 1.56 km W of Cobb, California · 14492 days ago · 0 km deep · 1 km away
  47. 1.86 km W of Cobb, California · 14492 days ago · 1 km deep · 1 km away
  48. 1.89 km W of Cobb, California · 14492 days ago · 0 km deep · 2 km away
  49. 1.712 km ENE of Cloverdale, California · 14491 days ago · 0 km deep · 7 km away
  50. 1.75 km WNW of Cobb, California · 14491 days ago · 0 km deep · 3 km away
  51. 1.88 km E of Hidden Valley Lake, California · 14490 days ago · 8 km deep · 30 km away
  52. 2.48 km E of Hidden Valley Lake, California · 14490 days ago · 9 km deep · 30 km away
  53. 1.811 km E of Black Point-Green Point, California · 14490 days ago · 16 km deep · 88 km away
  54. 1.77 km NE of Healdsburg, California · 14490 days ago · 2 km deep · 18 km away
  55. 1.916 km SE of Sea Ranch, California · 14489 days ago · 4 km deep · 53 km away
  56. 1.64 km WSW of Cobb, California · 14489 days ago · 1 km deep · 4 km away
  57. 1.67 km W of Cobb, California · 14488 days ago · 0 km deep · 1 km away
  58. 2.13 km WSW of Green Valley, California · 14488 days ago · 8 km deep · 84 km away
  59. 1.96 km W of Cobb, California · 14488 days ago · -1 km deep · 1 km away
  60. 2.15 km WSW of Cobb, California · 14487 days ago · -1 km deep · 4 km away

The first 60 of 171.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc91481 (also filed as usp00031aj). Read Tue, Sep 22, 2026, 9:25 AM UTC.