California earthquakes

M2.8 earthquake 6 km WSW of Cobb, California

A magnitude 2.8 earthquake struck 6 km WSW of Cobb, California on Mon, Apr 9, 1984, 8:02 PM PST (04:02 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.2 7 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
2.8 (md), micro
Local time
UTC
1984-04-10 04:02:38 UTC
Depth
0.3 km (0.2 mi), shallow
Epicenter
38.804° N, 122.791° 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 0.3 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
63°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 170 in the 60 days after this one and 116 in the 30 days before it.

After

  1. 2.57 km WSW of Cobb, California · 15513 days ago · 0 km deep · 1 km away
  2. 1.66 km S of Hopland, California · 15513 days ago · 4 km deep · 30 km away
  3. 1.77 km WSW of Cobb, California · 15513 days ago · 0 km deep · 1 km away
  4. 1.65 km W of Cobb, California · 15513 days ago · 0 km deep · 2 km away
  5. 1.513 km W of Cazadero, California · 15513 days ago · 4 km deep · 48 km away
  6. 1.98 km SE of Willits, California · 15513 days ago · 4 km deep · 74 km away
  7. 2.09 km WSW of Cobb, California · 15513 days ago · 2 km deep · 3 km away
  8. 1.75 km W of Cobb, California · 15512 days ago · 3 km deep · 2 km away
  9. 1.58 km SE of Willits, California · 15512 days ago · 6 km deep · 75 km away
  10. 1.5Northern California · 15512 days ago · 6 km deep · 29 km away
  11. 1.65 km WSW of Cobb, California · 15512 days ago · 0 km deep · 2 km away
  12. 1.85 km WSW of Cobb, California · 15512 days ago · 0 km deep · 1 km away
  13. 1.68 km WSW of Cobb, California · 15512 days ago · 0 km deep · 2 km away
  14. 2.48 km WSW of Cobb, California · 15512 days ago · -1 km deep · 3 km away
  15. 1.85 km W of Cobb, California · 15511 days ago · 0 km deep · 3 km away
  16. 2.67 km NW of Cobb, California · 15511 days ago · 3 km deep · 8 km away
  17. 2.28 km WSW of Cobb, California · 15511 days ago · 3 km deep · 2 km away
  18. 1.78 km WSW of Cobb, California · 15511 days ago · 3 km deep · 2 km away
  19. 1.66 km W of Cobb, California · 15511 days ago · 1 km deep · 3 km away
  20. 2.56 km W of Cobb, California · 15511 days ago · 1 km deep · 2 km away
  21. 2.16 km W of Cobb, California · 15511 days ago · -1 km deep · 3 km away
  22. 1.9Northern California · 15510 days ago · 0 km deep · 2 km away
  23. 1.68 km NE of Brooktrails, California · 15510 days ago · 10 km deep · 90 km away
  24. 2.86 km W of Cobb, California · 15510 days ago · 3 km deep · 1 km away
  25. 1.5Northern California · 15510 days ago · 3 km deep · 1 km away
  26. 2.15 km W of Cobb, California · 15509 days ago · 0 km deep · 2 km away
  27. 1.67 km W of Cobb, California · 15509 days ago · 3 km deep · 2 km away
  28. 1.59 km WSW of Cobb, California · 15508 days ago · 1 km deep · 3 km away
  29. 1.95 km WSW of Cobb, California · 15506 days ago · 0 km deep · 0 km away
  30. 1.77 km W of Cobb, California · 15506 days ago · 3 km deep · 2 km away
  31. 2.69 km WSW of Cobb, California · 15505 days ago · 2 km deep · 3 km away
  32. 1.64 km SSE of Clear Lake Riviera, California · 15505 days ago · 0 km deep · 16 km away
  33. 1.96 km W of Cobb, California · 15505 days ago · 3 km deep · 2 km away
  34. 2.27 km W of Cobb, California · 15505 days ago · 2 km deep · 2 km away
  35. 1.96 km W of Cobb, California · 15505 days ago · 3 km deep · 2 km away
  36. 1.58 km W of Cobb, California · 15505 days ago · 1 km deep · 3 km away
  37. 1.86 km W of Cobb, California · 15505 days ago · 3 km deep · 2 km away
  38. 2.38 km SE of Willits, California · 15505 days ago · 3 km deep · 75 km away
  39. 1.69 km SE of Willits, California · 15505 days ago · 5 km deep · 74 km away
  40. 3.08 km SE of Willits, California · 15504 days ago · 3 km deep · 75 km away
  41. 1.99 km SE of Willits, California · 15504 days ago · 4 km deep · 74 km away
  42. 1.95 km WSW of Cobb, California · 15504 days ago · 1 km deep · 1 km away
  43. 1.65 km WSW of Cobb, California · 15504 days ago · 0 km deep · 1 km away
  44. 1.85 km WSW of Cobb, California · 15504 days ago · -1 km deep · 1 km away
  45. 2.35 km WSW of Cobb, California · 15504 days ago · -1 km deep · 1 km away
  46. 2.55 km WSW of Cobb, California · 15504 days ago · 1 km deep · 1 km away
  47. 1.85 km WSW of Cobb, California · 15503 days ago · 0 km deep · 1 km away
  48. 2.05 km WSW of Cobb, California · 15503 days ago · 0 km deep · 1 km away
  49. 2.08 km NE of Hidden Valley Lake, California · 15503 days ago · -1 km deep · 26 km away
  50. 2.05 km WSW of Cobb, California · 15503 days ago · 0 km deep · 1 km away
  51. 2.15 km WSW of Cobb, California · 15502 days ago · 1 km deep · 1 km away
  52. 1.76 km W of Cobb, California · 15502 days ago · 0 km deep · 2 km away
  53. 2.03 km WNW of Soda Bay, California · 15502 days ago · 4 km deep · 24 km away
  54. 1.95 km W of Cobb, California · 15501 days ago · 0 km deep · 3 km away
  55. 1.98 km W of Cobb, California · 15501 days ago · 0 km deep · 3 km away
  56. 1.69 km WSW of Cobb, California · 15499 days ago · 2 km deep · 3 km away
  57. 1.74 km W of Cobb, California · 15499 days ago · 0 km deep · 2 km away
  58. 2.25 km W of Cobb, California · 15499 days ago · 0 km deep · 2 km away
  59. 1.87 km WSW of Cobb, California · 15498 days ago · 3 km deep · 2 km away
  60. 1.72 km W of Cobb, California · 15498 days ago · -1 km deep · 4 km away

The first 60 of 170.

Before

  1. 3.06 km W of Cobb, California · 15513 days ago · 0 km deep · 1 km away
  2. 1.66 km WSW of Cobb, California · 15513 days ago · 0 km deep · 1 km away
  3. 1.66 km WSW of Cobb, California · 15513 days ago · 0 km deep · 1 km away
  4. 1.99 km W of Cobb, California · 15513 days ago · -1 km deep · 3 km away
  5. 1.63 km ENE of Brooktrails, California · 15513 days ago · 4 km deep · 87 km away
  6. 2.99 km SE of Willits, California · 15513 days ago · 4 km deep · 74 km away
  7. 1.616 km ENE of Potter Valley, California · 15513 days ago · 8 km deep · 66 km away
  8. 1.55 km SSW of Boonville, California · 15514 days ago · 1 km deep · 56 km away
  9. 1.65 km E of Lakeport, California · 15514 days ago · 5 km deep · 27 km away
  10. 1.87 km WSW of Cobb, California · 15515 days ago · 0 km deep · 1 km away
  11. 1.69 km WSW of Cobb, California · 15515 days ago · 7 km deep · 3 km away
  12. 1.75 km WSW of Cobb, California · 15515 days ago · 0 km deep · 1 km away
  13. 1.69 km WSW of Cobb, California · 15516 days ago · 2 km deep · 3 km away
  14. 2.18 km SE of Willits, California · 15516 days ago · 2 km deep · 75 km away
  15. 1.69 km ESE of Willits, California · 15517 days ago · 6 km deep · 75 km away
  16. 1.66 km W of Cobb, California · 15517 days ago · 3 km deep · 2 km away
  17. 1.78 km SE of Willits, California · 15518 days ago · -1 km deep · 75 km away
  18. 1.718 km NNE of Upper Lake, California · 15518 days ago · 9 km deep · 58 km away
  19. 2.06 km WSW of Cobb, California · 15518 days ago · 3 km deep · 1 km away
  20. 2.66 km W of Cobb, California · 15518 days ago · 0 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc14849. Read Wed, Sep 30, 2026, 4:54 AM UTC.