California earthquakes

M2.1 earthquake 6 km W of Cobb, California

A magnitude 2.1 earthquake struck 6 km W of Cobb, California on Wed, Aug 1, 1984, 11:47 AM PDT (18:47 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.3 11 km ENE of Clearlake, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-08-01 18:47:02 UTC
Depth
3.3 km (2.0 mi), shallow
Epicenter
38.823° N, 122.802° 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
±0.18
Depth from
From location
Station coverage gap
35°
Stations used
23

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 163 in the 60 days after this one and 105 in the 30 days before it.

After

  1. 1.66 km W of Cobb, California · 15402 days ago · 3 km deep · 0 km away
  2. 1.94 km W of Cobb, California · 15402 days ago · -1 km deep · 2 km away
  3. 1.52 km WNW of Redwood Valley, California · 15400 days ago · 4 km deep · 62 km away
  4. 1.88 km WSW of Cobb, California · 15399 days ago · 3 km deep · 2 km away
  5. 1.613 km NNW of Moskowite Corner, California · 15399 days ago · 15 km deep · 56 km away
  6. 1.56 km WSW of Cobb, California · 15399 days ago · 3 km deep · 2 km away
  7. 1.920 km NNE of Upper Lake, California · 15398 days ago · 7 km deep · 58 km away
  8. 1.66 km W of Cobb, California · 15397 days ago · 2 km deep · 1 km away
  9. 1.96 km WSW of Cobb, California · 15396 days ago · 3 km deep · 2 km away
  10. 2.46 km W of Cobb, California · 15396 days ago · 3 km deep · 1 km away
  11. 1.74 km WSW of Cobb, California · 15396 days ago · 1 km deep · 3 km away
  12. 2.73 km ENE of Lakeport, California · 15395 days ago · 2 km deep · 26 km away
  13. 1.76 km W of Cobb, California · 15394 days ago · 1 km deep · 1 km away
  14. 1.99 km WSW of Cobb, California · 15394 days ago · 1 km deep · 3 km away
  15. 1.74 km W of Redwood Valley, California · 15393 days ago · 2 km deep · 62 km away
  16. 2.07 km W of Cobb, California · 15393 days ago · 3 km deep · 1 km away
  17. 2.48 km SSE of Dunnigan, California · 15393 days ago · 9 km deep · 77 km away
  18. 1.84 km W of Cobb, California · 15393 days ago · 0 km deep · 2 km away
  19. 1.84 km W of Cobb, California · 15393 days ago · -1 km deep · 2 km away
  20. 2.15 km SW of Cobb, California · 15392 days ago · 1 km deep · 5 km away
  21. 1.613 km NNE of Angwin, California · 15392 days ago · 8 km deep · 38 km away
  22. 2.619 km ENE of Potter Valley, California · 15390 days ago · 10 km deep · 61 km away
  23. 1.918 km ENE of Potter Valley, California · 15390 days ago · 5 km deep · 60 km away
  24. 1.810 km S of Willows, California · 15390 days ago · 20 km deep · 86 km away
  25. 2.110 km WNW of Lakeport, California · 15389 days ago · 30 km deep · 34 km away
  26. 1.75 km SW of Cobb, California · 15388 days ago · 0 km deep · 5 km away
  27. 1.66 km W of Cobb, California · 15388 days ago · 3 km deep · 1 km away
  28. 2.68 km WSW of Cobb, California · 15388 days ago · 3 km deep · 3 km away
  29. 1.76 km W of Cobb, California · 15387 days ago · 3 km deep · 0 km away
  30. 1.76 km W of Cobb, California · 15386 days ago · 3 km deep · 0 km away
  31. 2.13 km SE of Clearlake Oaks, California · 15386 days ago · 2 km deep · 24 km away
  32. 1.612 km ESE of Hidden Valley Lake, California · 15386 days ago · 1 km deep · 33 km away
  33. 1.66 km W of Cobb, California · 15384 days ago · 3 km deep · 1 km away
  34. 1.85 km SW of Cobb, California · 15383 days ago · 1 km deep · 6 km away
  35. 2.35 km WSW of Cobb, California · 15383 days ago · 1 km deep · 2 km away
  36. 1.917 km WSW of Guinda, California · 15383 days ago · 5 km deep · 39 km away
  37. 1.65 km E of Healdsburg, California · 15383 days ago · 1 km deep · 25 km away
  38. 2.45 km SW of Cottonwood, California · 15383 days ago · 1 km deep · 72 km away
  39. 1.79 km WSW of Cobb, California · 15382 days ago · 2 km deep · 3 km away
  40. 1.75 km SW of Cobb, California · 15381 days ago · 0 km deep · 4 km away
  41. 2.57 km WSW of Cobb, California · 15380 days ago · 0 km deep · 2 km away
  42. 2.04 km WSW of Cobb, California · 15380 days ago · 1 km deep · 3 km away
  43. 1.57 km W of Cobb, California · 15379 days ago · 1 km deep · 1 km away
  44. 2.06 km WSW of Cobb, California · 15378 days ago · 0 km deep · 2 km away
  45. 2.93 km E of Redwood Valley, California · 15378 days ago · 6 km deep · 59 km away
  46. 1.57 km W of Cobb, California · 15377 days ago · 3 km deep · 1 km away
  47. 1.816 km NNE of Upper Lake, California · 15377 days ago · 7 km deep · 53 km away
  48. 2.46 km WSW of Cobb, California · 15377 days ago · 1 km deep · 2 km away
  49. 1.710 km NNE of Cloverdale, California · 15377 days ago · 5 km deep · 18 km away
  50. 1.65 km W of Cobb, California · 15376 days ago · 0 km deep · 2 km away
  51. 2.48 km NNE of Hopland, California · 15376 days ago · 1 km deep · 35 km away
  52. 1.58 km S of Calistoga, California · 15376 days ago · 7 km deep · 41 km away
  53. 2.05 km SW of Cobb, California · 15376 days ago · 0 km deep · 4 km away
  54. 2.66 km WSW of Cobb, California · 15376 days ago · -1 km deep · 3 km away
  55. 2.823 km NNE of Potter Valley, California · 15375 days ago · 4 km deep · 78 km away
  56. 2.13 km W of Cloverdale, California · 15375 days ago · 17 km deep · 22 km away
  57. 1.76 km WSW of Cobb, California · 15375 days ago · 3 km deep · 2 km away
  58. 1.76 km WSW of Cobb, California · 15375 days ago · 3 km deep · 2 km away
  59. 1.78 km NNE of Hopland, California · 15375 days ago · 0 km deep · 35 km away
  60. 2.46 km WSW of Cobb, California · 15375 days ago · 3 km deep · 2 km away

The first 60 of 163.

Before

  1. 2.0Northern California · 15403 days ago · 0 km deep · 2 km away
  2. 2.315 km NE of Lucerne, California · 15404 days ago · 0 km deep · 44 km away
  3. 2.326 km ENE of Potter Valley, California · 15404 days ago · 4 km deep · 70 km away
  4. 3.06 km W of Cobb, California · 15404 days ago · 3 km deep · 1 km away
  5. 2.21 km S of American Canyon, California · 15404 days ago · 0 km deep · 87 km away
  6. 2.67 km W of Cobb, California · 15404 days ago · 2 km deep · 0 km away
  7. 1.78 km WSW of Cobb, California · 15404 days ago · 3 km deep · 3 km away
  8. 2.45 km NNW of Guinda, California · 15405 days ago · 0 km deep · 51 km away
  9. 1.68 km W of Cobb, California · 15405 days ago · 3 km deep · 2 km away
  10. 1.625 km NNE of Potter Valley, California · 15405 days ago · 6 km deep · 80 km away
  11. 1.87 km W of Cobb, California · 15405 days ago · 0 km deep · 1 km away
  12. 1.97 km WSW of Cobb, California · 15405 days ago · 1 km deep · 2 km away
  13. 2.07 km W of Cobb, California · 15405 days ago · 0 km deep · 1 km away
  14. 1.74 km SSE of Calpella, California · 15405 days ago · 7 km deep · 53 km away
  15. 1.98 km WSW of Cobb, California · 15406 days ago · 0 km deep · 2 km away
  16. 2.25 km WSW of Cobb, California · 15406 days ago · 0 km deep · 2 km away
  17. 2.36 km WSW of Cobb, California · 15406 days ago · 3 km deep · 1 km away
  18. 1.57 km WSW of Cobb, California · 15406 days ago · 2 km deep · 2 km away
  19. 1.625 km NNE of Potter Valley, California · 15407 days ago · 3 km deep · 81 km away
  20. 1.57 km SW of Cobb, California · 15407 days ago · 3 km deep · 6 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc24740. Read Fri, Oct 2, 2026, 10:53 PM UTC.