California earthquakes

M2.9 earthquake 7 km WSW of Cobb, California

A magnitude 2.9 earthquake struck 7 km WSW of Cobb, California on Sat, Dec 10, 1977, 8:32 PM PST (04:32 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.4 4 km NW of Ukiah, 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
2.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-12-11 04:32:08 UTC
Depth
1.2 km (0.7 mi), shallow
Epicenter
38.800° N, 122.803° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
36°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 101 in the 60 days after this one and 52 in the 30 days before it.

After

  1. 1.97 km W of Cobb, California · 17829 days ago · 3 km deep · 2 km away
  2. 1.88 km WSW of Cobb, California · 17828 days ago · 0 km deep · 1 km away
  3. 2.47 km E of Willits, California · 17828 days ago · 7 km deep · 79 km away
  4. 2.26 km WNW of Napa, California · 17827 days ago · 6 km deep · 66 km away
  5. 2.010 km W of North Lakeport, California · 17827 days ago · 5 km deep · 38 km away
  6. 2.216 km NE of Nice, California · 17827 days ago · 9 km deep · 48 km away
  7. 2.38 km WSW of Cobb, California · 17825 days ago · 3 km deep · 1 km away
  8. 1.76 km WSW of Cobb, California · 17824 days ago · -1 km deep · 0 km away
  9. 2.37 km ENE of Vallejo, California · 17824 days ago · 0 km deep · 93 km away
  10. 2.37 km WSW of Cobb, California · 17823 days ago · 4 km deep · 1 km away
  11. 1.712 km NNE of Angwin, California · 17822 days ago · 10 km deep · 36 km away
  12. 1.96 km W of Cobb, California · 17822 days ago · 3 km deep · 2 km away
  13. 1.97 km W of Cobb, California · 17822 days ago · 3 km deep · 1 km away
  14. 2.315 km NNE of Nice, California · 17822 days ago · 11 km deep · 50 km away
  15. 2.04 km WSW of Cobb, California · 17821 days ago · 1 km deep · 3 km away
  16. 2.66 km W of Cobb, California · 17820 days ago · -1 km deep · 1 km away
  17. 1.57 km WSW of Cobb, California · 17820 days ago · 0 km deep · 1 km away
  18. 1.66 km W of Cobb, California · 17820 days ago · 3 km deep · 2 km away
  19. 3.38 km ESE of Willits, California · 17820 days ago · 9 km deep · 77 km away
  20. 1.80 km E of Larkfield-Wikiup, California · 17819 days ago · 2 km deep · 32 km away
  21. 2.12 km SSW of Dunnigan, California · 17817 days ago · 10 km deep · 72 km away
  22. 2.64 km W of Dunnigan, California · 17817 days ago · 12 km deep · 68 km away
  23. 2.57 km WSW of Cobb, California · 17815 days ago · 4 km deep · 1 km away
  24. 2.46 km E of Geyserville, California · 17815 days ago · 4 km deep · 10 km away
  25. 2.19 km W of Cobb, California · 17814 days ago · 1 km deep · 3 km away
  26. 2.19 km W of Cobb, California · 17813 days ago · 1 km deep · 3 km away
  27. 1.69 km W of Cobb, California · 17813 days ago · 1 km deep · 3 km away
  28. 1.77 km WSW of Cobb, California · 17813 days ago · -1 km deep · 1 km away
  29. 1.710 km ESE of Hidden Valley Lake, California · 17813 days ago · 8 km deep · 31 km away
  30. 1.99 km ESE of Hidden Valley Lake, California · 17813 days ago · 19 km deep · 31 km away
  31. 1.710 km ESE of Hidden Valley Lake, California · 17813 days ago · 7 km deep · 31 km away
  32. 1.58 km W of Cobb, California · 17811 days ago · 0 km deep · 2 km away
  33. 1.67 km E of Geyserville, CA · 17808 days ago · 3 km deep · 9 km away
  34. 1.56 km E of Geyserville, CA · 17808 days ago · 4 km deep · 11 km away
  35. 1.69 km W of Cobb, California · 17806 days ago · 1 km deep · 3 km away
  36. 2.07 km SSE of Dunnigan, California · 17805 days ago · 9 km deep · 76 km away
  37. 1.78 km W of Cobb, California · 17805 days ago · 2 km deep · 3 km away
  38. 1.88 km NE of Healdsburg, California · 17805 days ago · 8 km deep · 15 km away
  39. 1.67 km E of Geyserville, California · 17804 days ago · 6 km deep · 11 km away
  40. 2.79 km NNE of Larkfield-Wikiup, California · 17804 days ago · 3 km deep · 25 km away
  41. 3.04 km ENE of Willits, California · 17803 days ago · 2 km deep · 82 km away
  42. 2.410 km SE of Comptche, California · 17803 days ago · 7 km deep · 76 km away
  43. 1.68 km W of Cobb, California · 17802 days ago · 0 km deep · 2 km away
  44. 1.57 km WSW of Cobb, California · 17801 days ago · 1 km deep · 1 km away
  45. 2.810 km NE of Healdsburg, California · 17801 days ago · 6 km deep · 15 km away
  46. 1.97 km WSW of Cobb, California · 17801 days ago · 1 km deep · 1 km away
  47. 2.410 km NE of Healdsburg, California · 17800 days ago · 5 km deep · 15 km away
  48. 1.57 km W of Cobb, California · 17799 days ago · 1 km deep · 2 km away
  49. 2.110 km NE of Healdsburg, California · 17799 days ago · 3 km deep · 15 km away
  50. 2.56 km W of Cobb, California · 17798 days ago · 3 km deep · 2 km away
  51. 1.96 km SSE of Moskowite Corner, California · 17798 days ago · 4 km deep · 71 km away
  52. 2.32 km SSW of Monument Hills, California · 17797 days ago · 10 km deep · 81 km away
  53. 1.93 km NE of Santa Rosa, California · 17797 days ago · 8 km deep · 38 km away
  54. 1.66 km NNW of Cobb, California · 17796 days ago · 3 km deep · 10 km away
  55. 1.96 km S of Clear Lake Riviera, California · 17796 days ago · 1 km deep · 13 km away
  56. 1.76 km WSW of Cobb, California · 17796 days ago · 1 km deep · 1 km away
  57. 2.78 km W of Cobb, California · 17796 days ago · 0 km deep · 2 km away
  58. 2.28 km W of Cobb, California · 17796 days ago · 0 km deep · 2 km away
  59. 2.36 km W of Cobb, California · 17796 days ago · 3 km deep · 2 km away
  60. 3.08 km WSW of Cobb, California · 17796 days ago · 0 km deep · 2 km away

The first 60 of 101.

Before

  1. 2.63 km NW of Redwood Valley, California · 17832 days ago · 2 km deep · 65 km away
  2. 2.36 km W of Manchester, California · 17834 days ago · 8 km deep · 85 km away
  3. 1.710 km NE of Healdsburg, California · 17837 days ago · 5 km deep · 15 km away
  4. 3.010 km NE of Healdsburg, California · 17837 days ago · 6 km deep · 15 km away
  5. 1.57 km W of Cobb, California · 17837 days ago · 3 km deep · 2 km away
  6. 2.17 km SW of Calistoga, California · 17837 days ago · 6 km deep · 34 km away
  7. 1.68 km W of Saint Helena, California · 17837 days ago · 6 km deep · 39 km away
  8. 2.414 km NNW of Potter Valley, California · 17840 days ago · 10 km deep · 78 km away
  9. 2.511 km N of Potter Valley, California · 17840 days ago · 1 km deep · 75 km away
  10. 2.0Northern California · 17840 days ago · 5 km deep · 15 km away
  11. 1.7Northern California · 17840 days ago · 7 km deep · 14 km away
  12. 2.95 km NE of Willits, California · 17840 days ago · -1 km deep · 83 km away
  13. 3.019 km N of Potter Valley, California · 17841 days ago · 0 km deep · 83 km away
  14. 2.29 km WSW of Cobb, California · 17841 days ago · 0 km deep · 2 km away
  15. 1.66 km ENE of Santa Rosa, California · 17841 days ago · 6 km deep · 41 km away
  16. 2.19 km WSW of Cobb, California · 17842 days ago · 1 km deep · 2 km away
  17. 2.68 km WSW of Cobb, California · 17842 days ago · 0 km deep · 1 km away
  18. 3.28 km WSW of Cobb, California · 17842 days ago · 1 km deep · 2 km away
  19. 2.110 km ENE of Healdsburg, California · 17843 days ago · 5 km deep · 16 km away
  20. 1.76 km W of Cobb, California · 17844 days ago · 4 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038092. Read Sun, Oct 4, 2026, 4:11 PM UTC.