California earthquakes

M2.8 earthquake 7 km W of Cobb, California

A magnitude 2.8 earthquake struck 7 km W of Cobb, California on Wed, Dec 31, 1986, 10:34 AM PST (18:34 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.

Open the live map with earthquakes

The earthquake

Magnitude
2.8 (md), micro
Local time
UTC
1986-12-31 18:34:27 UTC
Depth
-0.9 km (-0.5 mi), shallow
Epicenter
38.828° N, 122.810° 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, 0.8 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
52°
Stations used
18

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. 2.04 km WSW of North Lakeport, California · 14504 days ago · 4 km deep · 30 km away
  2. 3.45 km SW of Cobb, California · 14503 days ago · 0 km deep · 5 km away
  3. 1.96 km SW of Cobb, California · 14503 days ago · 1 km deep · 6 km away
  4. 2.64 km NNW of Benicia, California · 14502 days ago · 11 km deep · 99 km away
  5. 1.64 km NNE of Crockett, California · 14502 days ago · 7 km deep · 98 km away
  6. 1.74 km NNE of Crockett, California · 14502 days ago · 8 km deep · 98 km away
  7. 2.47 km E of Hidden Valley Lake, California · 14501 days ago · 8 km deep · 29 km away
  8. 2.14 km WSW of Cobb, California · 14501 days ago · 1 km deep · 4 km away
  9. 1.75 km ESE of Talmage, California · 14501 days ago · 5 km deep · 41 km away
  10. 1.54 km N of Port Costa, California · 14501 days ago · 13 km deep · 99 km away
  11. 1.87 km NW of Yolo, California · 14500 days ago · 5 km deep · 82 km away
  12. 2.75 km W of Cobb, California · 14500 days ago · 1 km deep · 3 km away
  13. 2.36 km WSW of Cobb, California · 14500 days ago · 2 km deep · 2 km away
  14. 1.59 km ESE of Hidden Valley Lake, California · 14500 days ago · 7 km deep · 31 km away
  15. 2.23 km N of Port Costa, California · 14499 days ago · 8 km deep · 100 km away
  16. 1.74 km WSW of Cobb, California · 14499 days ago · 1 km deep · 4 km away
  17. 1.65 km WSW of Cobb, California · 14498 days ago · 1 km deep · 3 km away
  18. 1.64 km WNW of Cobb, California · 14498 days ago · 2 km deep · 3 km away
  19. 1.68 km W of Cobb, California · 14497 days ago · 2 km deep · 2 km away
  20. 2.28 km ENE of Hopland, California · 14497 days ago · 6 km deep · 27 km away
  21. 1.73 km SW of Cobb, California · 14496 days ago · 1 km deep · 6 km away
  22. 1.66 km W of Cobb, California · 14496 days ago · 2 km deep · 2 km away
  23. 1.98 km WSW of Cobb, California · 14496 days ago · 3 km deep · 4 km away
  24. 1.710 km NNW of Redwood Valley, California · 14495 days ago · 4 km deep · 69 km away
  25. 2.82 km E of Rohnert Park, California · 14495 days ago · 5 km deep · 55 km away
  26. 2.13 km ESE of Rohnert Park, California · 14495 days ago · 0 km deep · 57 km away
  27. 1.710 km SSW of Cloverdale, California · 14495 days ago · 30 km deep · 25 km away
  28. 1.82 km E of Rohnert Park, California · 14495 days ago · 3 km deep · 56 km away
  29. 1.77 km E of Hidden Valley Lake, California · 14495 days ago · 8 km deep · 29 km away
  30. 2.97 km W of Cobb, California · 14495 days ago · 4 km deep · 1 km away
  31. 2.47 km W of Cobb, California · 14495 days ago · 4 km deep · 1 km away
  32. 2.82 km ENE of Rohnert Park, California · 14495 days ago · 6 km deep · 55 km away
  33. 2.010 km E of Hidden Valley Lake, California · 14495 days ago · 10 km deep · 32 km away
  34. 1.91 km ENE of Rohnert Park, California · 14495 days ago · 3 km deep · 55 km away
  35. 2.27 km E of Hidden Valley Lake, California · 14495 days ago · 8 km deep · 29 km away
  36. 2.02 km ENE of Rohnert Park, California · 14494 days ago · 3 km deep · 55 km away
  37. 1.86 km NE of Windsor, California · 14494 days ago · 3 km deep · 27 km away
  38. 1.61 km E of Roseland, California · 14494 days ago · 17 km deep · 46 km away
  39. 1.62 km ENE of Penngrove, California · 14494 days ago · 0 km deep · 59 km away
  40. 1.56 km E of Cloverdale, California · 14494 days ago · 0 km deep · 12 km away
  41. 1.66 km W of Cobb, California · 14493 days ago · 2 km deep · 1 km away
  42. 1.75 km SW of Cobb, California · 14493 days ago · 1 km deep · 6 km away
  43. 1.76 km W of Cobb, California · 14492 days ago · 2 km deep · 2 km away
  44. 1.86 km W of Cobb, California · 14492 days ago · 3 km deep · 1 km away
  45. 1.56 km W of Cobb, California · 14492 days ago · 0 km deep · 1 km away
  46. 1.86 km W of Cobb, California · 14492 days ago · 1 km deep · 1 km away
  47. 1.89 km W of Cobb, California · 14492 days ago · 0 km deep · 2 km away
  48. 1.712 km ENE of Cloverdale, California · 14491 days ago · 0 km deep · 6 km away
  49. 1.75 km WNW of Cobb, California · 14491 days ago · 0 km deep · 3 km away
  50. 1.88 km E of Hidden Valley Lake, California · 14490 days ago · 8 km deep · 31 km away
  51. 2.48 km E of Hidden Valley Lake, California · 14490 days ago · 9 km deep · 30 km away
  52. 1.811 km E of Black Point-Green Point, California · 14490 days ago · 16 km deep · 89 km away
  53. 1.77 km NE of Healdsburg, California · 14490 days ago · 2 km deep · 19 km away
  54. 1.916 km SE of Sea Ranch, California · 14489 days ago · 4 km deep · 53 km away
  55. 1.64 km WSW of Cobb, California · 14489 days ago · 1 km deep · 4 km away
  56. 1.67 km W of Cobb, California · 14488 days ago · 0 km deep · 2 km away
  57. 2.13 km WSW of Green Valley, California · 14488 days ago · 8 km deep · 85 km away
  58. 1.96 km W of Cobb, California · 14488 days ago · -1 km deep · 2 km away
  59. 2.15 km WSW of Cobb, California · 14488 days ago · -1 km deep · 4 km away
  60. 1.98 km W of Cobb, California · 14487 days ago · 1 km deep · 1 km away

The first 60 of 171.

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc91522. Read Tue, Sep 22, 2026, 10:58 AM UTC.