California earthquakes

M2.1 earthquake 8 km W of Cobb, California

A magnitude 2.1 earthquake struck 8 km W of Cobb, California on Wed, Mar 21, 1984, 4:01 AM PST (12:01 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.6 3 km NNW of Dunnigan, 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
2.1 (md), micro
Local time
UTC
1984-03-21 12:01:25 UTC
Depth
0.2 km (0.1 mi), shallow
Epicenter
38.818° 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 0.2 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
43°
Stations used
19

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 0 in the 30 days before it.

After

  1. 1.67 km W of Cobb, California · 15513 days ago · 3 km deep · 1 km away
  2. 1.59 km WSW of Cobb, California · 15513 days ago · 1 km deep · 2 km away
  3. 1.59 km ENE of Brooktrails, California · 15513 days ago · 10 km deep · 85 km away
  4. 1.96 km W of Cobb, California · 15513 days ago · 3 km deep · 1 km away
  5. 1.83 km WNW of Soda Bay, California · 15512 days ago · 5 km deep · 22 km away
  6. 1.58 km WSW of Cobb, California · 15512 days ago · 3 km deep · 2 km away
  7. 2.07 km W of Cobb, California · 15512 days ago · 3 km deep · 1 km away
  8. 1.83 km WNW of Soda Bay, California · 15512 days ago · 6 km deep · 22 km away
  9. 2.63 km NNW of Dunnigan, California · 15512 days ago · 7 km deep · 73 km away
  10. 2.3Northern California · 15511 days ago · 12 km deep · 22 km away
  11. 2.86 km WSW of Cobb, California · 15511 days ago · 3 km deep · 2 km away
  12. 2.66 km W of Cobb, California · 15511 days ago · 0 km deep · 2 km away
  13. 2.06 km WSW of Cobb, California · 15511 days ago · 3 km deep · 2 km away
  14. 1.718 km NNE of Upper Lake, California · 15511 days ago · 9 km deep · 56 km away
  15. 1.78 km SE of Willits, California · 15511 days ago · -1 km deep · 72 km away
  16. 1.66 km W of Cobb, California · 15510 days ago · 3 km deep · 2 km away
  17. 1.69 km ESE of Willits, California · 15509 days ago · 6 km deep · 72 km away
  18. 2.18 km SE of Willits, California · 15509 days ago · 2 km deep · 72 km away
  19. 1.69 km WSW of Cobb, California · 15509 days ago · 2 km deep · 2 km away
  20. 1.75 km WSW of Cobb, California · 15508 days ago · 0 km deep · 3 km away
  21. 1.69 km WSW of Cobb, California · 15508 days ago · 7 km deep · 2 km away
  22. 1.87 km WSW of Cobb, California · 15508 days ago · 0 km deep · 2 km away
  23. 1.65 km E of Lakeport, California · 15507 days ago · 5 km deep · 25 km away
  24. 1.55 km SSW of Boonville, California · 15507 days ago · 1 km deep · 53 km away
  25. 1.616 km ENE of Potter Valley, California · 15506 days ago · 8 km deep · 64 km away
  26. 2.99 km SE of Willits, California · 15506 days ago · 4 km deep · 72 km away
  27. 1.63 km ENE of Brooktrails, California · 15506 days ago · 4 km deep · 85 km away
  28. 1.99 km W of Cobb, California · 15506 days ago · -1 km deep · 1 km away
  29. 1.66 km WSW of Cobb, California · 15506 days ago · 0 km deep · 2 km away
  30. 1.66 km WSW of Cobb, California · 15506 days ago · 0 km deep · 2 km away
  31. 3.06 km W of Cobb, California · 15506 days ago · 0 km deep · 2 km away
  32. 2.86 km WSW of Cobb, California · 15506 days ago · 0 km deep · 3 km away
  33. 2.57 km WSW of Cobb, California · 15506 days ago · 0 km deep · 2 km away
  34. 1.66 km S of Hopland, California · 15506 days ago · 4 km deep · 28 km away
  35. 1.77 km WSW of Cobb, California · 15506 days ago · 0 km deep · 2 km away
  36. 1.65 km W of Cobb, California · 15506 days ago · 0 km deep · 3 km away
  37. 1.513 km W of Cazadero, California · 15506 days ago · 4 km deep · 48 km away
  38. 1.98 km SE of Willits, California · 15506 days ago · 4 km deep · 72 km away
  39. 2.09 km WSW of Cobb, California · 15505 days ago · 2 km deep · 2 km away
  40. 1.75 km W of Cobb, California · 15505 days ago · 3 km deep · 2 km away
  41. 1.58 km SE of Willits, California · 15505 days ago · 6 km deep · 72 km away
  42. 1.5Northern California · 15505 days ago · 6 km deep · 31 km away
  43. 1.65 km WSW of Cobb, California · 15505 days ago · 0 km deep · 4 km away
  44. 1.85 km WSW of Cobb, California · 15505 days ago · 0 km deep · 4 km away
  45. 1.68 km WSW of Cobb, California · 15504 days ago · 0 km deep · 1 km away
  46. 2.48 km WSW of Cobb, California · 15504 days ago · -1 km deep · 1 km away
  47. 1.85 km W of Cobb, California · 15504 days ago · 0 km deep · 3 km away
  48. 2.67 km NW of Cobb, California · 15504 days ago · 3 km deep · 7 km away
  49. 2.28 km WSW of Cobb, California · 15504 days ago · 3 km deep · 2 km away
  50. 1.78 km WSW of Cobb, California · 15504 days ago · 3 km deep · 2 km away
  51. 1.66 km W of Cobb, California · 15504 days ago · 1 km deep · 2 km away
  52. 2.56 km W of Cobb, California · 15503 days ago · 1 km deep · 2 km away
  53. 2.16 km W of Cobb, California · 15503 days ago · -1 km deep · 2 km away
  54. 1.9Northern California · 15503 days ago · 0 km deep · 4 km away
  55. 1.68 km NE of Brooktrails, California · 15503 days ago · 10 km deep · 87 km away
  56. 2.86 km W of Cobb, California · 15503 days ago · 3 km deep · 2 km away
  57. 1.5Northern California · 15503 days ago · 3 km deep · 2 km away
  58. 2.15 km W of Cobb, California · 15501 days ago · 0 km deep · 3 km away
  59. 1.67 km W of Cobb, California · 15501 days ago · 3 km deep · 1 km away
  60. 1.59 km WSW of Cobb, California · 15501 days ago · 1 km deep · 2 km away

The first 60 of 167.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1112964. Read Tue, Sep 22, 2026, 8:56 PM UTC.