California earthquakes

M2.7 earthquake 5 km SW of Cobb, California

A magnitude 2.7 earthquake struck 5 km SW of Cobb, California on Wed, Dec 5, 1984, 9:47 AM PST (17:47 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.0 8 km W 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
2.7 (md), micro
Local time
UTC
1984-12-05 17:47:23 UTC
Depth
0.3 km (0.2 mi), shallow
Epicenter
38.784° 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 0.2 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
37°
Stations used
26

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 194 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.18 km W of Cobb, California · 15252 days ago · 1 km deep · 6 km away
  2. 3.08 km W of Cobb, California · 15252 days ago · 1 km deep · 6 km away
  3. 1.58 km W of Cobb, California · 15252 days ago · 1 km deep · 6 km away
  4. 1.88 km W of Cobb, California · 15252 days ago · 1 km deep · 6 km away
  5. 1.58 km W of Cobb, California · 15252 days ago · 1 km deep · 6 km away
  6. 2.17 km W of Cobb, California · 15252 days ago · 0 km deep · 6 km away
  7. 1.616 km WSW of Cloverdale, California · 15251 days ago · 9 km deep · 37 km away
  8. 2.05 km N of Sea Ranch, California · 15251 days ago · 22 km deep · 59 km away
  9. 1.74 km W of Glen Ellen, California · 15251 days ago · 9 km deep · 49 km away
  10. 2.55 km WSW of Cobb, California · 15250 days ago · 1 km deep · 3 km away
  11. 1.67 km W of Cobb, California · 15250 days ago · 1 km deep · 6 km away
  12. 1.817 km ENE of Potter Valley, California · 15250 days ago · 7 km deep · 70 km away
  13. 1.65 km W of Cobb, California · 15250 days ago · 1 km deep · 4 km away
  14. 1.98 km W of Cobb, California · 15250 days ago · 1 km deep · 6 km away
  15. 3.45 km SW of Cobb, California · 15249 days ago · 0 km deep · 1 km away
  16. 3.05 km SW of Cobb, California · 15249 days ago · 0 km deep · 0 km away
  17. 1.55 km SW of Cobb, California · 15249 days ago · 1 km deep · 0 km away
  18. 1.85 km SW of Cobb, California · 15249 days ago · 0 km deep · 1 km away
  19. 2.7Northern California · 15249 days ago · 0 km deep · 1 km away
  20. 1.8Northern California · 15249 days ago · 1 km deep · 0 km away
  21. 1.56 km SW of Cobb, California · 15249 days ago · 0 km deep · 0 km away
  22. 2.111 km NE of Talmage, California · 15249 days ago · 7 km deep · 53 km away
  23. 1.67 km WSW of Cobb, California · 15249 days ago · 1 km deep · 4 km away
  24. 1.53 km WSW of Calistoga, California · 15248 days ago · 4 km deep · 28 km away
  25. 1.55 km WSW of Cobb, California · 15248 days ago · 0 km deep · 2 km away
  26. 2.26 km W of Cobb, California · 15248 days ago · 3 km deep · 5 km away
  27. 2.56 km W of Cobb, California · 15248 days ago · 4 km deep · 4 km away
  28. 1.56 km W of Cobb, California · 15248 days ago · 3 km deep · 5 km away
  29. 1.87 km W of Cobb, California · 15247 days ago · 3 km deep · 5 km away
  30. 1.68 km W of Cobb, California · 15247 days ago · 0 km deep · 6 km away
  31. 1.67 km W of Cobb, California · 15247 days ago · 1 km deep · 6 km away
  32. 1.53 km SW of Cobb, California · 15247 days ago · 12 km deep · 2 km away
  33. 1.56 km ESE of Hopland, California · 15246 days ago · 5 km deep · 30 km away
  34. 1.95 km W of Cobb, California · 15246 days ago · 0 km deep · 5 km away
  35. 1.87 km WSW of Cobb, California · 15246 days ago · 0 km deep · 5 km away
  36. 1.93 km NE of Point Arena, California · 15246 days ago · -1 km deep · 79 km away
  37. 2.05 km WNW of Cobb, California · 15245 days ago · 1 km deep · 6 km away
  38. 1.86 km W of Cobb, California · 15245 days ago · 3 km deep · 6 km away
  39. 1.54 km WSW of Cobb, California · 15245 days ago · 1 km deep · 2 km away
  40. 1.96 km WSW of Cobb, California · 15244 days ago · 3 km deep · 3 km away
  41. 1.87 km W of Cobb, California · 15244 days ago · 3 km deep · 5 km away
  42. 2.73 km NNE of Santa Rosa, California · 15243 days ago · 8 km deep · 36 km away
  43. 1.81 km SSW of Kenwood, California · 15243 days ago · 4 km deep · 47 km away
  44. 1.68 km WSW of Cobb, California · 15243 days ago · 3 km deep · 4 km away
  45. 1.74 km W of Cobb, California · 15242 days ago · -1 km deep · 4 km away
  46. 3.06 km W of Cobb, California · 15242 days ago · 3 km deep · 5 km away
  47. 2.77 km WSW of Cobb, California · 15242 days ago · 1 km deep · 4 km away
  48. 1.94 km WSW of Cobb, California · 15242 days ago · 1 km deep · 2 km away
  49. 1.89 km NNW of Redwood Valley, California · 15242 days ago · 7 km deep · 75 km away
  50. 1.66 km W of Cobb, California · 15241 days ago · 2 km deep · 4 km away
  51. 1.916 km ENE of Potter Valley, California · 15241 days ago · 6 km deep · 68 km away
  52. 1.87 km W of Cobb, California · 15241 days ago · 0 km deep · 5 km away
  53. 2.07 km W of Cobb, California · 15241 days ago · 1 km deep · 5 km away
  54. 1.610 km WNW of Potter Valley, California · 15240 days ago · 7 km deep · 76 km away
  55. 1.67 km WSW of Cobb, California · 15240 days ago · 0 km deep · 4 km away
  56. 1.66 km W of Cobb, California · 15240 days ago · 1 km deep · 6 km away
  57. 1.66 km WSW of Cobb, California · 15240 days ago · 0 km deep · 4 km away
  58. 1.67 km WSW of Cobb, California · 15239 days ago · 3 km deep · 4 km away
  59. 2.48 km WSW of Cobb, California · 15238 days ago · -1 km deep · 5 km away
  60. 2.45 km W of Cobb, California · 15238 days ago · 0 km deep · 5 km away

The first 60 of 194.

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc33555. Read Tue, Sep 22, 2026, 8:51 PM UTC.