California earthquakes

M2.3 earthquake 7 km WSW of Cobb, California

A magnitude 2.3 earthquake struck 7 km WSW of Cobb, California on Thu, Oct 6, 1977, 7:01 PM PDT (02:01 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M3.1 10 km NE of Healdsburg, 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
2.3 (md), micro
Local time
UTC
1977-10-07 02:01:21 UTC
Depth
0.8 km (0.5 mi), shallow
Epicenter
38.803° N, 122.805° 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
±0.10
Depth from
From location
Station coverage gap
57°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 93 in the 60 days after this one and 69 in the 30 days before it.

After

  1. 2.26 km W of Cobb, California · 17883 days ago · 4 km deep · 2 km away
  2. 3.110 km NE of Healdsburg, California · 17882 days ago · 6 km deep · 15 km away
  3. 2.210 km NE of Healdsburg, California · 17882 days ago · 6 km deep · 15 km away
  4. 1.87 km W of Cobb, California · 17882 days ago · 3 km deep · 2 km away
  5. 2.411 km NE of Healdsburg, California · 17880 days ago · 5 km deep · 15 km away
  6. 2.05 km W of Glen Ellen, California · 17879 days ago · 8 km deep · 53 km away
  7. 1.611 km NE of Healdsburg, California · 17877 days ago · 5 km deep · 14 km away
  8. 1.810 km NE of Healdsburg, California · 17876 days ago · 5 km deep · 15 km away
  9. 1.611 km NE of Healdsburg, California · 17875 days ago · 5 km deep · 15 km away
  10. 1.97 km WSW of Cobb, California · 17875 days ago · 3 km deep · 1 km away
  11. 2.02 km ESE of Clearlake, California · 17875 days ago · 5 km deep · 24 km away
  12. 3.35 km WSW of Glen Ellen, California · 17870 days ago · 11 km deep · 56 km away
  13. 2.56 km W of Cobb, California · 17870 days ago · 3 km deep · 2 km away
  14. 1.96 km SW of Glen Ellen, California · 17869 days ago · 7 km deep · 57 km away
  15. 1.78 km W of Cobb, California · 17868 days ago · 1 km deep · 2 km away
  16. 1.54 km S of Clear Lake Riviera, California · 17868 days ago · 1 km deep · 14 km away
  17. 2.35 km SW of Glen Ellen, California · 17868 days ago · 10 km deep · 56 km away
  18. 2.116 km NE of Lucerne, California · 17866 days ago · 7 km deep · 47 km away
  19. 2.15 km SW of Clearlake, California · 17864 days ago · 3 km deep · 18 km away
  20. 1.56 km W of Cobb, California · 17863 days ago · 0 km deep · 1 km away
  21. 2.17 km W of Cobb, California · 17863 days ago · 0 km deep · 3 km away
  22. 1.57 km WSW of Cobb, California · 17863 days ago · 1 km deep · 0 km away
  23. 2.27 km E of Cloverdale, California · 17861 days ago · 2 km deep · 11 km away
  24. 1.712 km ESE of Angwin, California · 17859 days ago · 9 km deep · 52 km away
  25. 2.14 km S of Willows, California · 17859 days ago · 21 km deep · 92 km away
  26. 1.88 km S of Calistoga, California · 17859 days ago · 6 km deep · 38 km away
  27. 3.58 km S of Green Valley, California · 17858 days ago · 0 km deep · 90 km away
  28. 1.811 km NE of Healdsburg, California · 17858 days ago · 5 km deep · 14 km away
  29. 2.01 km E of Larkfield-Wikiup, California · 17857 days ago · 4 km deep · 32 km away
  30. 2.01 km ESE of Larkfield-Wikiup, California · 17857 days ago · 4 km deep · 33 km away
  31. 1.611 km NE of Healdsburg, California · 17855 days ago · 5 km deep · 14 km away
  32. 2.36 km W of Cobb, California · 17855 days ago · -1 km deep · 1 km away
  33. 2.05 km NE of Ukiah, California · 17854 days ago · 0 km deep · 53 km away
  34. 2.611 km NE of Healdsburg, California · 17852 days ago · 5 km deep · 15 km away
  35. 2.411 km NE of Healdsburg, California · 17852 days ago · 5 km deep · 14 km away
  36. 2.511 km NE of Healdsburg, California · 17852 days ago · 5 km deep · 14 km away
  37. 1.711 km NE of Healdsburg, California · 17852 days ago · 5 km deep · 15 km away
  38. 2.111 km NE of Healdsburg, California · 17851 days ago · 3 km deep · 15 km away
  39. 2.411 km NE of Healdsburg, California · 17851 days ago · 4 km deep · 15 km away
  40. 2.46 km WSW of Cobb, California · 17851 days ago · 0 km deep · 1 km away
  41. 3.19 km SSW of Willows, California · 17850 days ago · 19 km deep · 87 km away
  42. 1.66 km W of Cobb, California · 17849 days ago · 3 km deep · 2 km away
  43. 3.019 km WSW of Stonyford, California · 17849 days ago · 15 km deep · 53 km away
  44. 1.610 km ENE of Healdsburg, California · 17847 days ago · 6 km deep · 17 km away
  45. 2.27 km W of Cobb, California · 17847 days ago · 3 km deep · 2 km away
  46. 2.57 km W of Cobb, California · 17847 days ago · 3 km deep · 2 km away
  47. 2.07 km WSW of Cobb, California · 17847 days ago · 0 km deep · 0 km away
  48. 1.68 km W of Cobb, California · 17846 days ago · 1 km deep · 1 km away
  49. 2.56 km W of Cobb, California · 17845 days ago · -1 km deep · 1 km away
  50. 1.811 km NE of Angwin, California · 17845 days ago · 10 km deep · 44 km away
  51. 1.84 km ESE of Clear Lake Riviera, California · 17845 days ago · 5 km deep · 19 km away
  52. 1.91 km NW of Larkfield-Wikiup, California · 17842 days ago · 2 km deep · 31 km away
  53. 2.47 km W of Cobb, California · 17842 days ago · 3 km deep · 2 km away
  54. 1.90 km ESE of Clear Lake Riviera, California · 17841 days ago · 1 km deep · 18 km away
  55. 2.56 km W of Cobb, California · 17840 days ago · 3 km deep · 2 km away
  56. 1.810 km SE of Boonville, California · 17840 days ago · 5 km deep · 44 km away
  57. 1.62 km NW of Cobb, California · 17838 days ago · 1 km deep · 7 km away
  58. 4.88 km E of Willits, California · 17836 days ago · 15 km deep · 78 km away
  59. 2.24 km WSW of Moskowite Corner, California · 17836 days ago · 8 km deep · 64 km away
  60. 2.55 km ENE of Willits, California · 17835 days ago · -1 km deep · 81 km away

The first 60 of 93.

Before

  1. 2.06 km W of Cobb, California · 17884 days ago · 0 km deep · 1 km away
  2. 2.0Northern California · 17885 days ago · 8 km deep · 48 km away
  3. 1.58 km W of Cobb, California · 17885 days ago · 0 km deep · 2 km away
  4. 1.66 km W of Cobb, California · 17886 days ago · 4 km deep · 2 km away
  5. 2.86 km W of Cobb, California · 17887 days ago · 0 km deep · 1 km away
  6. 2.56 km W of Cobb, California · 17887 days ago · 3 km deep · 2 km away
  7. 1.73 km E of Clear Lake Riviera, California · 17890 days ago · 4 km deep · 19 km away
  8. 1.63 km NE of Hopland, California · 17890 days ago · 3 km deep · 32 km away
  9. 1.611 km NE of Healdsburg, California · 17892 days ago · 6 km deep · 15 km away
  10. 1.811 km NE of Healdsburg, California · 17892 days ago · 4 km deep · 15 km away
  11. 1.87 km W of Kelseyville, California · 17895 days ago · 6 km deep · 21 km away
  12. 2.010 km NE of Healdsburg, California · 17896 days ago · 5 km deep · 16 km away
  13. 1.810 km NE of Healdsburg, California · 17897 days ago · 5 km deep · 15 km away
  14. 2.4Northern California · 17897 days ago · 2 km deep · 3 km away
  15. 3.83 km WSW of Cobb, California · 17897 days ago · 2 km deep · 4 km away
  16. 1.94 km WSW of Cobb, California · 17897 days ago · 0 km deep · 3 km away
  17. 2.14 km WSW of Cobb, California · 17897 days ago · 1 km deep · 3 km away
  18. 2.611 km NE of Healdsburg, California · 17898 days ago · 5 km deep · 14 km away
  19. 1.6Northern California · 17898 days ago · 8 km deep · 29 km away
  20. 1.87 km WSW of Cobb, California · 17898 days ago · 3 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1037136. Read Tue, Sep 22, 2026, 8:47 PM UTC.