California earthquakes

M2.8 earthquake 6 km W of Cobb, California

A magnitude 2.8 earthquake struck 6 km W of Cobb, California on Fri, Dec 9, 1983, 9:50 PM PST (05:50 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.4 14 km N of Brooktrails, 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
2.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1983-12-10 05:50:04 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
38.817° N, 122.800° 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, 0.4 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
38°
Stations used
27

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 167 in the 60 days after this one and 113 in the 30 days before it.

After

  1. 2.56 km E of Penngrove, California · 15638 days ago · 5 km deep · 62 km away
  2. 2.16 km W of Cobb, California · 15638 days ago · 3 km deep · 0 km away
  3. 1.94 km W of Cobb, California · 15638 days ago · 0 km deep · 2 km away
  4. 1.69 km W of Cobb, California · 15638 days ago · 1 km deep · 3 km away
  5. 2.610 km WSW of Hopland, California · 15637 days ago · 2 km deep · 39 km away
  6. 3.414 km N of Brooktrails, California · 15637 days ago · 6 km deep · 98 km away
  7. 2.010 km WSW of Hopland, California · 15637 days ago · 2 km deep · 39 km away
  8. 2.311 km ESE of Potter Valley, California · 15636 days ago · 6 km deep · 55 km away
  9. 1.87 km WSW of Cobb, California · 15636 days ago · 1 km deep · 2 km away
  10. 1.88 km NE of Willits, California · 15635 days ago · 7 km deep · 82 km away
  11. 3.17 km W of Cobb, California · 15635 days ago · 0 km deep · 1 km away
  12. 2.07 km WSW of Cobb, California · 15635 days ago · 0 km deep · 1 km away
  13. 2.010 km ENE of Woodland, California · 15635 days ago · 14 km deep · 100 km away
  14. 1.79 km ESE of Hidden Valley Lake, California · 15634 days ago · 6 km deep · 30 km away
  15. 1.56 km W of Cobb, California · 15634 days ago · 3 km deep · 1 km away
  16. 2.08 km WSW of Cobb, California · 15634 days ago · 1 km deep · 3 km away
  17. 1.55 km WSW of Cobb, California · 15633 days ago · 1 km deep · 2 km away
  18. 2.213 km ESE of Angwin, California · 15633 days ago · -1 km deep · 53 km away
  19. 1.58 km SW of Calistoga, California · 15633 days ago · 6 km deep · 36 km away
  20. 2.42 km SE of Clear Lake Riviera, California · 15633 days ago · 1 km deep · 16 km away
  21. 2.13 km SE of Clear Lake Riviera, California · 15633 days ago · 2 km deep · 16 km away
  22. 1.714 km SE of Laytonville, California · 15633 days ago · 3 km deep · 99 km away
  23. 1.65 km SW of Cobb, California · 15632 days ago · 0 km deep · 4 km away
  24. 1.77 km WSW of Cobb, California · 15632 days ago · 1 km deep · 1 km away
  25. 1.99 km WSW of Cobb, California · 15631 days ago · 1 km deep · 3 km away
  26. 2.06 km WSW of Cobb, California · 15630 days ago · 2 km deep · 1 km away
  27. 1.83 km E of Santa Rosa, California · 15629 days ago · 8 km deep · 43 km away
  28. 1.87 km WSW of Cobb, California · 15629 days ago · 0 km deep · 2 km away
  29. 1.76 km WSW of Cobb, California · 15629 days ago · 3 km deep · 1 km away
  30. 1.823 km ENE of Potter Valley, California · 15629 days ago · 14 km deep · 65 km away
  31. 1.59 km WSW of Cobb, California · 15628 days ago · 1 km deep · 3 km away
  32. 3.17 km W of Cobb, California · 15628 days ago · 1 km deep · 1 km away
  33. 1.76 km W of Cobb, California · 15628 days ago · 3 km deep · 1 km away
  34. 2.928 km WNW of Stonyford, California · 15627 days ago · 4 km deep · 74 km away
  35. 1.625 km NNE of Potter Valley, California · 15627 days ago · 5 km deep · 81 km away
  36. 1.66 km W of Cobb, California · 15627 days ago · 3 km deep · 1 km away
  37. 1.54 km NW of Redwood Valley, California · 15626 days ago · 7 km deep · 66 km away
  38. 1.84 km S of Cobb, California · 15626 days ago · 1 km deep · 7 km away
  39. 1.711 km NE of Healdsburg, California · 15625 days ago · 5 km deep · 16 km away
  40. 1.56 km W of Cobb, California · 15625 days ago · 3 km deep · 1 km away
  41. 2.47 km W of Cobb, California · 15625 days ago · 2 km deep · 1 km away
  42. 2.25 km WSW of Cobb, California · 15625 days ago · 0 km deep · 2 km away
  43. 2.36 km WSW of Cobb, California · 15625 days ago · 0 km deep · 1 km away
  44. 1.97 km WSW of Cobb, California · 15624 days ago · 0 km deep · 2 km away
  45. 2.26 km W of Cobb, California · 15624 days ago · 3 km deep · 1 km away
  46. 1.58 km WSW of Cobb, California · 15623 days ago · 3 km deep · 2 km away
  47. 1.56 km WSW of Cobb, California · 15623 days ago · 1 km deep · 1 km away
  48. 1.66 km W of Cobb, California · 15622 days ago · 3 km deep · 1 km away
  49. 2.26 km W of Cobb, California · 15621 days ago · 3 km deep · 0 km away
  50. 1.88 km WSW of Cobb, California · 15621 days ago · 1 km deep · 2 km away
  51. 1.66 km WSW of Cobb, California · 15621 days ago · 4 km deep · 1 km away
  52. 2.37 km W of Cobb, California · 15621 days ago · 0 km deep · 2 km away
  53. 1.77 km W of Cobb, California · 15621 days ago · 1 km deep · 2 km away
  54. 2.013 km WSW of Esparto, California · 15621 days ago · 8 km deep · 60 km away
  55. 2.47 km WSW of Cobb, California · 15620 days ago · 1 km deep · 2 km away
  56. 2.16 km S of Clear Lake Riviera, California · 15620 days ago · -1 km deep · 11 km away
  57. 1.75 km WSW of Cobb, California · 15620 days ago · -1 km deep · 2 km away
  58. 2.57 km W of Cobb, California · 15620 days ago · 2 km deep · 1 km away
  59. 1.712 km N of Brooktrails, California · 15619 days ago · 6 km deep · 96 km away
  60. 2.16 km ENE of Willits, California · 15619 days ago · 3 km deep · 80 km away

The first 60 of 167.

Before

  1. 1.85 km SSW of Cobb, California · 15639 days ago · -1 km deep · 7 km away
  2. 1.77 km WSW of Cobb, California · 15639 days ago · 1 km deep · 2 km away
  3. 2.67 km WSW of Cobb, California · 15639 days ago · 1 km deep · 1 km away
  4. 1.77 km WSW of Cobb, California · 15639 days ago · 0 km deep · 1 km away
  5. 2.28 km WSW of Cobb, California · 15639 days ago · 3 km deep · 3 km away
  6. 2.47 km WSW of Cobb, California · 15640 days ago · 0 km deep · 2 km away
  7. 1.918 km E of Potter Valley, California · 15640 days ago · 8 km deep · 59 km away
  8. 1.87 km WSW of Cobb, California · 15640 days ago · -1 km deep · 2 km away
  9. 1.77 km WSW of Cobb, California · 15640 days ago · 0 km deep · 1 km away
  10. 1.6Northern California · 15641 days ago · 1 km deep · 9 km away
  11. 2.76 km WSW of Cobb, California · 15641 days ago · 0 km deep · 2 km away
  12. 1.68 km W of Cobb, California · 15641 days ago · 0 km deep · 2 km away
  13. 1.714 km NNE of Angwin, California · 15642 days ago · 9 km deep · 39 km away
  14. 1.76 km W of Cobb, California · 15642 days ago · 3 km deep · 0 km away
  15. 1.57 km W of Cobb, California · 15642 days ago · 3 km deep · 1 km away
  16. 1.57 km E of Willits, California · 15642 days ago · 9 km deep · 77 km away
  17. 1.67 km W of Cobb, California · 15642 days ago · 3 km deep · 1 km away
  18. 1.77 km WSW of Cobb, California · 15643 days ago · 1 km deep · 1 km away
  19. 1.76 km W of Cobb, California · 15643 days ago · 3 km deep · 1 km away
  20. 1.56 km W of Cobb, California · 15643 days ago · 3 km deep · 0 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1108235. Read Sat, Oct 3, 2026, 4:34 PM UTC.