California earthquakes

M3.0 earthquake 8 km W of Cobb, California

A magnitude 3.0 earthquake struck 8 km W of Cobb, California on Wed, Dec 19, 1984, 5:55 PM PST (01:55 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.5 6 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.

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The earthquake

Magnitude
3.0 (md), minor
Local time
UTC
1984-12-20 01:55:22 UTC
Depth
1.0 km (0.6 mi), shallow
Epicenter
38.821° N, 122.818° 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
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
37°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 197 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.89 km NNW of Redwood Valley, California · 15241 days ago · 7 km deep · 69 km away
  2. 1.66 km W of Cobb, California · 15241 days ago · 2 km deep · 2 km away
  3. 1.916 km ENE of Potter Valley, California · 15241 days ago · 6 km deep · 64 km away
  4. 1.87 km W of Cobb, California · 15240 days ago · 0 km deep · 1 km away
  5. 2.07 km W of Cobb, California · 15240 days ago · 1 km deep · 1 km away
  6. 1.610 km WNW of Potter Valley, California · 15240 days ago · 7 km deep · 70 km away
  7. 1.67 km WSW of Cobb, California · 15239 days ago · 0 km deep · 2 km away
  8. 1.66 km W of Cobb, California · 15239 days ago · 1 km deep · 2 km away
  9. 1.66 km WSW of Cobb, California · 15239 days ago · 0 km deep · 2 km away
  10. 1.67 km WSW of Cobb, California · 15238 days ago · 3 km deep · 2 km away
  11. 2.48 km WSW of Cobb, California · 15238 days ago · -1 km deep · 2 km away
  12. 2.45 km W of Cobb, California · 15237 days ago · 0 km deep · 3 km away
  13. 1.75 km W of Cobb, California · 15237 days ago · 0 km deep · 3 km away
  14. 1.75 km SW of Cobb, California · 15237 days ago · 1 km deep · 5 km away
  15. 1.96 km W of Cobb, California · 15237 days ago · 3 km deep · 2 km away
  16. 1.89 km W of Cobb, California · 15237 days ago · 0 km deep · 1 km away
  17. 1.87 km WSW of Cobb, California · 15236 days ago · 2 km deep · 2 km away
  18. 2.28 km W of Cobb, California · 15236 days ago · 0 km deep · 1 km away
  19. 2.54 km ENE of Geyserville, California · 15235 days ago · 14 km deep · 10 km away
  20. 2.220 km NNE of Upper Lake, California · 15235 days ago · 7 km deep · 59 km away
  21. 1.65 km NNW of Hidden Valley Lake, California · 15235 days ago · 7 km deep · 20 km away
  22. 1.619 km ENE of Potter Valley, California · 15234 days ago · 10 km deep · 63 km away
  23. 2.35 km SW of Cobb, California · 15234 days ago · 1 km deep · 5 km away
  24. 1.64 km WSW of Cobb, California · 15233 days ago · 1 km deep · 4 km away
  25. 1.96 km W of Cobb, California · 15233 days ago · 1 km deep · 2 km away
  26. 2.48 km WSW of Cobb, California · 15233 days ago · 3 km deep · 2 km away
  27. 1.53 km WNW of Cobb, California · 15232 days ago · 2 km deep · 5 km away
  28. 1.76 km W of Cobb, California · 15232 days ago · 4 km deep · 2 km away
  29. 1.56 km WSW of Cobb, California · 15232 days ago · 0 km deep · 3 km away
  30. 1.97 km W of Cobb, California · 15232 days ago · 0 km deep · 1 km away
  31. 1.916 km ENE of Potter Valley, California · 15231 days ago · 7 km deep · 65 km away
  32. 1.5Northern California · 15231 days ago · 1 km deep · 3 km away
  33. 1.88 km W of Cobb, California · 15231 days ago · 0 km deep · 1 km away
  34. 1.75 km W of Cobb, California · 15231 days ago · 1 km deep · 3 km away
  35. 1.77 km WSW of Cobb, California · 15230 days ago · 3 km deep · 3 km away
  36. 1.58 km W of Cobb, California · 15230 days ago · 1 km deep · 2 km away
  37. 1.6Northern California · 15230 days ago · 0 km deep · 4 km away
  38. 1.74 km NNW of Geyserville, California · 15230 days ago · 3 km deep · 12 km away
  39. 1.98 km W of Cobb, California · 15230 days ago · 0 km deep · 0 km away
  40. 1.76 km W of Cobb, California · 15230 days ago · 3 km deep · 2 km away
  41. 1.57 km WSW of Cobb, California · 15230 days ago · 2 km deep · 2 km away
  42. 2.06 km W of Cobb, California · 15229 days ago · 2 km deep · 2 km away
  43. 2.16 km W of Cobb, California · 15229 days ago · 3 km deep · 2 km away
  44. 1.613 km E of Angwin, California · 15229 days ago · 2 km deep · 53 km away
  45. 1.75 km SW of Cobb, California · 15229 days ago · 1 km deep · 7 km away
  46. 1.86 km WSW of Cobb, California · 15229 days ago · 0 km deep · 3 km away
  47. 2.24 km W of Cobb, California · 15228 days ago · 0 km deep · 4 km away
  48. 1.54 km W of Cobb, California · 15228 days ago · 0 km deep · 3 km away
  49. 1.52 km WNW of Clear Lake Riviera, California · 15228 days ago · 4 km deep · 17 km away
  50. 2.04 km WSW of Cobb, California · 15228 days ago · 1 km deep · 4 km away
  51. 1.64 km SSW of Clear Lake Riviera, California · 15228 days ago · -1 km deep · 13 km away
  52. 1.66 km W of Cobb, California · 15227 days ago · 3 km deep · 2 km away
  53. 2.19 km SW of Hopland, California · 15227 days ago · 14 km deep · 32 km away
  54. 2.26 km WNW of Potter Valley, California · 15227 days ago · 5 km deep · 66 km away
  55. 1.86 km WSW of Cobb, California · 15227 days ago · 1 km deep · 3 km away
  56. 1.56 km W of Cobb, California · 15227 days ago · 3 km deep · 2 km away
  57. 1.520 km NNE of Upper Lake, California · 15226 days ago · 5 km deep · 58 km away
  58. 1.65 km W of Calpella, California · 15226 days ago · 3 km deep · 60 km away
  59. 3.06 km W of Cobb, California · 15226 days ago · 2 km deep · 2 km away
  60. 1.85 km SW of Cobb, California · 15226 days ago · 0 km deep · 6 km away

The first 60 of 197.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc38821. Read Tue, Sep 22, 2026, 7:20 AM UTC.