California earthquakes

M2.5 earthquake 6 km W of Cobb, California

A magnitude 2.5 earthquake struck 6 km W of Cobb, California on Fri, Nov 18, 1977, 1:59 AM PST (09:59 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.8 8 km E of Willits, 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
2.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-11-18 09:59:56 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
38.824° N, 122.801° 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
±0.09
Depth from
From location
Station coverage gap
44°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 109 in the 60 days after this one and 43 in the 30 days before it.

After

  1. 1.810 km SE of Boonville, California · 17850 days ago · 5 km deep · 43 km away
  2. 1.62 km NW of Cobb, California · 17847 days ago · 1 km deep · 5 km away
  3. 4.88 km E of Willits, California · 17845 days ago · 15 km deep · 76 km away
  4. 2.24 km WSW of Moskowite Corner, California · 17845 days ago · 8 km deep · 66 km away
  5. 2.55 km ENE of Willits, California · 17845 days ago · -1 km deep · 79 km away
  6. 2.38 km NE of Willits, California · 17845 days ago · 0 km deep · 83 km away
  7. 3.46 km E of Willits, California · 17845 days ago · 11 km deep · 77 km away
  8. 3.55 km ENE of Willits, California · 17845 days ago · 1 km deep · 80 km away
  9. 2.65 km ENE of Willits, California · 17845 days ago · 2 km deep · 80 km away
  10. 3.25 km E of Willits, California · 17845 days ago · 9 km deep · 78 km away
  11. 3.45 km ENE of Willits, California · 17844 days ago · 4 km deep · 79 km away
  12. 3.34 km E of Willits, California · 17844 days ago · 10 km deep · 78 km away
  13. 3.05 km ENE of Willits, California · 17844 days ago · 13 km deep · 79 km away
  14. 2.59 km ESE of Willits, California · 17844 days ago · 0 km deep · 74 km away
  15. 2.46 km ESE of Willits, California · 17844 days ago · 5 km deep · 76 km away
  16. 2.64 km ESE of Willits, California · 17844 days ago · 5 km deep · 77 km away
  17. 3.45 km ENE of Willits, California · 17844 days ago · 2 km deep · 80 km away
  18. 2.55 km ENE of Willits, California · 17843 days ago · 1 km deep · 79 km away
  19. 2.85 km NE of Willits, California · 17843 days ago · 2 km deep · 82 km away
  20. 2.51 km NE of Willits, California · 17843 days ago · 1 km deep · 81 km away
  21. 1.76 km W of Cobb, California · 17841 days ago · 4 km deep · 1 km away
  22. 2.110 km ENE of Healdsburg, California · 17841 days ago · 5 km deep · 18 km away
  23. 3.28 km WSW of Cobb, California · 17839 days ago · 1 km deep · 3 km away
  24. 2.68 km WSW of Cobb, California · 17839 days ago · 0 km deep · 2 km away
  25. 2.19 km WSW of Cobb, California · 17839 days ago · 1 km deep · 3 km away
  26. 1.66 km ENE of Santa Rosa, California · 17839 days ago · 6 km deep · 43 km away
  27. 2.29 km WSW of Cobb, California · 17839 days ago · 0 km deep · 3 km away
  28. 3.019 km N of Potter Valley, California · 17838 days ago · 0 km deep · 80 km away
  29. 2.95 km NE of Willits, California · 17838 days ago · -1 km deep · 81 km away
  30. 1.7Northern California · 17837 days ago · 7 km deep · 17 km away
  31. 2.0Northern California · 17837 days ago · 5 km deep · 18 km away
  32. 2.511 km N of Potter Valley, California · 17837 days ago · 1 km deep · 72 km away
  33. 2.414 km NNW of Potter Valley, California · 17837 days ago · 10 km deep · 76 km away
  34. 1.68 km W of Saint Helena, California · 17835 days ago · 6 km deep · 41 km away
  35. 2.17 km SW of Calistoga, California · 17835 days ago · 6 km deep · 37 km away
  36. 1.57 km W of Cobb, California · 17834 days ago · 3 km deep · 1 km away
  37. 3.010 km NE of Healdsburg, California · 17834 days ago · 6 km deep · 17 km away
  38. 1.710 km NE of Healdsburg, California · 17834 days ago · 5 km deep · 17 km away
  39. 2.36 km W of Manchester, California · 17832 days ago · 8 km deep · 85 km away
  40. 2.63 km NW of Redwood Valley, California · 17830 days ago · 2 km deep · 63 km away
  41. 2.97 km WSW of Cobb, California · 17827 days ago · 1 km deep · 3 km away
  42. 1.97 km W of Cobb, California · 17826 days ago · 3 km deep · 0 km away
  43. 1.88 km WSW of Cobb, California · 17826 days ago · 0 km deep · 3 km away
  44. 2.47 km E of Willits, California · 17826 days ago · 7 km deep · 77 km away
  45. 2.26 km WNW of Napa, California · 17824 days ago · 6 km deep · 68 km away
  46. 2.010 km W of North Lakeport, California · 17824 days ago · 5 km deep · 36 km away
  47. 2.216 km NE of Nice, California · 17824 days ago · 9 km deep · 46 km away
  48. 2.38 km WSW of Cobb, California · 17822 days ago · 3 km deep · 3 km away
  49. 1.76 km WSW of Cobb, California · 17821 days ago · -1 km deep · 2 km away
  50. 2.37 km ENE of Vallejo, California · 17821 days ago · 0 km deep · 95 km away
  51. 2.37 km WSW of Cobb, California · 17820 days ago · 4 km deep · 3 km away
  52. 1.712 km NNE of Angwin, California · 17820 days ago · 10 km deep · 37 km away
  53. 1.96 km W of Cobb, California · 17819 days ago · 3 km deep · 1 km away
  54. 1.97 km W of Cobb, California · 17819 days ago · 3 km deep · 1 km away
  55. 2.315 km NNE of Nice, California · 17819 days ago · 11 km deep · 47 km away
  56. 2.04 km WSW of Cobb, California · 17818 days ago · 1 km deep · 3 km away
  57. 2.66 km W of Cobb, California · 17817 days ago · -1 km deep · 1 km away
  58. 1.57 km WSW of Cobb, California · 17817 days ago · 0 km deep · 2 km away
  59. 1.66 km W of Cobb, California · 17817 days ago · 3 km deep · 1 km away
  60. 3.38 km ESE of Willits, California · 17817 days ago · 9 km deep · 75 km away

The first 60 of 109.

Before

  1. 1.90 km ESE of Clear Lake Riviera, California · 17850 days ago · 1 km deep · 16 km away
  2. 2.47 km W of Cobb, California · 17851 days ago · 3 km deep · 0 km away
  3. 1.91 km NW of Larkfield-Wikiup, California · 17851 days ago · 2 km deep · 34 km away
  4. 1.84 km ESE of Clear Lake Riviera, California · 17854 days ago · 5 km deep · 17 km away
  5. 1.811 km NE of Angwin, California · 17854 days ago · 10 km deep · 45 km away
  6. 2.56 km W of Cobb, California · 17854 days ago · -1 km deep · 1 km away
  7. 1.68 km W of Cobb, California · 17856 days ago · 1 km deep · 2 km away
  8. 2.07 km WSW of Cobb, California · 17856 days ago · 0 km deep · 2 km away
  9. 2.57 km W of Cobb, California · 17856 days ago · 3 km deep · 1 km away
  10. 2.27 km W of Cobb, California · 17856 days ago · 3 km deep · 0 km away
  11. 1.610 km ENE of Healdsburg, California · 17857 days ago · 6 km deep · 19 km away
  12. 3.019 km WSW of Stonyford, California · 17858 days ago · 15 km deep · 51 km away
  13. 1.66 km W of Cobb, California · 17858 days ago · 3 km deep · 1 km away
  14. 3.19 km SSW of Willows, California · 17859 days ago · 19 km deep · 85 km away
  15. 2.46 km WSW of Cobb, California · 17860 days ago · 0 km deep · 2 km away
  16. 2.411 km NE of Healdsburg, California · 17861 days ago · 4 km deep · 17 km away
  17. 2.111 km NE of Healdsburg, California · 17861 days ago · 3 km deep · 17 km away
  18. 1.711 km NE of Healdsburg, California · 17861 days ago · 5 km deep · 17 km away
  19. 2.511 km NE of Healdsburg, California · 17861 days ago · 5 km deep · 16 km away
  20. 2.411 km NE of Healdsburg, California · 17861 days ago · 5 km deep · 16 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1037749. Read Fri, Oct 2, 2026, 2:50 AM UTC.