California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Wed, Dec 26, 1984, 10:33 PM PST (06:33 UTC), 3 km (2 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-12-27 06:33:46 UTC
Depth
2.6 km (1.6 mi), shallow
Epicenter
38.833° N, 122.801° 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 2.2 km horizontally, 2.5 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
208°, poorly surrounded by stations
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 196 in the 60 days after this one and 117 in the 30 days before it.

After

  1. 1.54 km WSW of Cobb, California · 15257 days ago · 1 km deep · 4 km away
  2. 1.96 km WSW of Cobb, California · 15256 days ago · 3 km deep · 3 km away
  3. 1.87 km W of Cobb, California · 15256 days ago · 3 km deep · 3 km away
  4. 2.73 km NNE of Santa Rosa, California · 15256 days ago · 8 km deep · 42 km away
  5. 1.81 km SSW of Kenwood, California · 15255 days ago · 4 km deep · 53 km away
  6. 1.68 km WSW of Cobb, California · 15255 days ago · 3 km deep · 4 km away
  7. 1.74 km W of Cobb, California · 15254 days ago · -1 km deep · 3 km away
  8. 3.06 km W of Cobb, California · 15254 days ago · 3 km deep · 1 km away
  9. 2.77 km WSW of Cobb, California · 15254 days ago · 1 km deep · 3 km away
  10. 1.94 km WSW of Cobb, California · 15254 days ago · 1 km deep · 4 km away
  11. 1.89 km NNW of Redwood Valley, California · 15254 days ago · 7 km deep · 69 km away
  12. 1.66 km W of Cobb, California · 15253 days ago · 2 km deep · 2 km away
  13. 1.916 km ENE of Potter Valley, California · 15253 days ago · 6 km deep · 63 km away
  14. 1.87 km W of Cobb, California · 15253 days ago · 0 km deep · 3 km away
  15. 2.07 km W of Cobb, California · 15253 days ago · 1 km deep · 2 km away
  16. 1.610 km WNW of Potter Valley, California · 15253 days ago · 7 km deep · 70 km away
  17. 1.67 km WSW of Cobb, California · 15252 days ago · 0 km deep · 4 km away
  18. 1.66 km W of Cobb, California · 15252 days ago · 1 km deep · 1 km away
  19. 1.66 km WSW of Cobb, California · 15252 days ago · 0 km deep · 3 km away
  20. 1.67 km WSW of Cobb, California · 15251 days ago · 3 km deep · 4 km away
  21. 2.48 km WSW of Cobb, California · 15250 days ago · -1 km deep · 3 km away
  22. 2.45 km W of Cobb, California · 15250 days ago · 0 km deep · 2 km away
  23. 1.75 km W of Cobb, California · 15250 days ago · 0 km deep · 1 km away
  24. 1.75 km SW of Cobb, California · 15250 days ago · 1 km deep · 5 km away
  25. 1.96 km W of Cobb, California · 15249 days ago · 3 km deep · 1 km away
  26. 1.89 km W of Cobb, California · 15249 days ago · 0 km deep · 3 km away
  27. 1.87 km WSW of Cobb, California · 15249 days ago · 2 km deep · 3 km away
  28. 2.28 km W of Cobb, California · 15248 days ago · 0 km deep · 1 km away
  29. 2.54 km ENE of Geyserville, California · 15248 days ago · 14 km deep · 12 km away
  30. 2.220 km NNE of Upper Lake, California · 15248 days ago · 7 km deep · 57 km away
  31. 1.65 km NNW of Hidden Valley Lake, California · 15247 days ago · 7 km deep · 19 km away
  32. 1.619 km ENE of Potter Valley, California · 15247 days ago · 10 km deep · 62 km away
  33. 2.35 km SW of Cobb, California · 15246 days ago · 1 km deep · 5 km away
  34. 1.64 km WSW of Cobb, California · 15246 days ago · 1 km deep · 4 km away
  35. 1.96 km W of Cobb, California · 15246 days ago · 1 km deep · 2 km away
  36. 2.48 km WSW of Cobb, California · 15245 days ago · 3 km deep · 4 km away
  37. 1.53 km WNW of Cobb, California · 15245 days ago · 2 km deep · 3 km away
  38. 1.76 km W of Cobb, California · 15245 days ago · 4 km deep · 1 km away
  39. 1.56 km WSW of Cobb, California · 15245 days ago · 0 km deep · 3 km away
  40. 1.97 km W of Cobb, California · 15245 days ago · 0 km deep · 1 km away
  41. 1.916 km ENE of Potter Valley, California · 15244 days ago · 7 km deep · 64 km away
  42. 1.5Northern California · 15244 days ago · 1 km deep · 5 km away
  43. 1.88 km W of Cobb, California · 15244 days ago · 0 km deep · 2 km away
  44. 1.75 km W of Cobb, California · 15243 days ago · 1 km deep · 2 km away
  45. 1.77 km WSW of Cobb, California · 15243 days ago · 3 km deep · 4 km away
  46. 1.58 km W of Cobb, California · 15243 days ago · 1 km deep · 1 km away
  47. 1.6Northern California · 15243 days ago · 0 km deep · 4 km away
  48. 1.74 km NNW of Geyserville, California · 15243 days ago · 3 km deep · 14 km away
  49. 1.98 km W of Cobb, California · 15243 days ago · 0 km deep · 2 km away
  50. 1.76 km W of Cobb, California · 15243 days ago · 3 km deep · 1 km away
  51. 1.57 km WSW of Cobb, California · 15242 days ago · 2 km deep · 3 km away
  52. 2.06 km W of Cobb, California · 15242 days ago · 2 km deep · 2 km away
  53. 2.16 km W of Cobb, California · 15242 days ago · 3 km deep · 2 km away
  54. 1.613 km E of Angwin, California · 15242 days ago · 2 km deep · 52 km away
  55. 1.75 km SW of Cobb, California · 15241 days ago · 1 km deep · 7 km away
  56. 1.86 km WSW of Cobb, California · 15241 days ago · 0 km deep · 3 km away
  57. 2.24 km W of Cobb, California · 15241 days ago · 0 km deep · 3 km away
  58. 1.54 km W of Cobb, California · 15241 days ago · 0 km deep · 2 km away
  59. 1.52 km WNW of Clear Lake Riviera, California · 15241 days ago · 4 km deep · 15 km away
  60. 2.04 km WSW of Cobb, California · 15240 days ago · 1 km deep · 4 km away

The first 60 of 196.

Before

  1. 2.05 km WNW of Cobb, California · 15257 days ago · 1 km deep · 1 km away
  2. 1.93 km NE of Point Arena, California · 15258 days ago · -1 km deep · 75 km away
  3. 1.87 km WSW of Cobb, California · 15258 days ago · 0 km deep · 3 km away
  4. 1.95 km W of Cobb, California · 15258 days ago · 0 km deep · 2 km away
  5. 1.56 km ESE of Hopland, California · 15258 days ago · 5 km deep · 25 km away
  6. 1.53 km SW of Cobb, California · 15259 days ago · 12 km deep · 6 km away
  7. 1.67 km W of Cobb, California · 15259 days ago · 1 km deep · 1 km away
  8. 1.68 km W of Cobb, California · 15259 days ago · 0 km deep · 2 km away
  9. 1.87 km W of Cobb, California · 15260 days ago · 3 km deep · 2 km away
  10. 1.56 km W of Cobb, California · 15260 days ago · 3 km deep · 2 km away
  11. 2.56 km W of Cobb, California · 15260 days ago · 4 km deep · 2 km away
  12. 2.26 km W of Cobb, California · 15260 days ago · 3 km deep · 2 km away
  13. 1.55 km WSW of Cobb, California · 15261 days ago · 0 km deep · 4 km away
  14. 1.53 km WSW of Calistoga, California · 15261 days ago · 4 km deep · 34 km away
  15. 1.67 km WSW of Cobb, California · 15261 days ago · 1 km deep · 3 km away
  16. 2.111 km NE of Talmage, California · 15261 days ago · 7 km deep · 47 km away
  17. 1.56 km SW of Cobb, California · 15261 days ago · 0 km deep · 6 km away
  18. 1.8Northern California · 15261 days ago · 1 km deep · 6 km away
  19. 2.7Northern California · 15261 days ago · 0 km deep · 5 km away
  20. 1.85 km SW of Cobb, California · 15261 days ago · 0 km deep · 5 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc37869. Read Sun, Oct 4, 2026, 10:47 PM UTC.