California earthquakes

M1.9 earthquake 7 km W of Cobb, California

A magnitude 1.9 earthquake struck 7 km W of Cobb, California on Sun, Dec 18, 1977, 9:16 AM PST (17:16 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.3 15 km NNE of Nice, 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
1.9 (md), micro
Local time
UTC
1977-12-18 17:16:54 UTC
Depth
2.8 km (1.8 mi), shallow
Epicenter
38.813° N, 122.808° 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
±0.09
Depth from
From location
Station coverage gap
40°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 98 in the 60 days after this one and 52 in the 30 days before it.

After

  1. 2.315 km NNE of Nice, California · 17809 days ago · 11 km deep · 48 km away
  2. 2.04 km WSW of Cobb, California · 17808 days ago · 1 km deep · 3 km away
  3. 2.66 km W of Cobb, California · 17808 days ago · -1 km deep · 1 km away
  4. 1.57 km WSW of Cobb, California · 17808 days ago · 0 km deep · 1 km away
  5. 1.66 km W of Cobb, California · 17808 days ago · 3 km deep · 1 km away
  6. 3.38 km ESE of Willits, California · 17807 days ago · 9 km deep · 75 km away
  7. 1.80 km E of Larkfield-Wikiup, California · 17807 days ago · 2 km deep · 34 km away
  8. 2.12 km SSW of Dunnigan, California · 17804 days ago · 10 km deep · 72 km away
  9. 2.64 km W of Dunnigan, California · 17804 days ago · 12 km deep · 69 km away
  10. 2.57 km WSW of Cobb, California · 17803 days ago · 4 km deep · 2 km away
  11. 2.46 km E of Geyserville, California · 17803 days ago · 4 km deep · 12 km away
  12. 2.19 km W of Cobb, California · 17801 days ago · 1 km deep · 2 km away
  13. 2.19 km W of Cobb, California · 17801 days ago · 1 km deep · 2 km away
  14. 1.69 km W of Cobb, California · 17801 days ago · 1 km deep · 3 km away
  15. 1.77 km WSW of Cobb, California · 17801 days ago · -1 km deep · 1 km away
  16. 1.710 km ESE of Hidden Valley Lake, California · 17801 days ago · 8 km deep · 32 km away
  17. 1.99 km ESE of Hidden Valley Lake, California · 17801 days ago · 19 km deep · 31 km away
  18. 1.710 km ESE of Hidden Valley Lake, California · 17801 days ago · 7 km deep · 31 km away
  19. 1.58 km W of Cobb, California · 17799 days ago · 0 km deep · 1 km away
  20. 1.67 km E of Geyserville, CA · 17796 days ago · 3 km deep · 11 km away
  21. 1.56 km E of Geyserville, CA · 17796 days ago · 4 km deep · 12 km away
  22. 1.69 km W of Cobb, California · 17794 days ago · 1 km deep · 2 km away
  23. 2.07 km SSE of Dunnigan, California · 17793 days ago · 9 km deep · 76 km away
  24. 1.78 km W of Cobb, California · 17793 days ago · 2 km deep · 2 km away
  25. 1.88 km NE of Healdsburg, California · 17793 days ago · 8 km deep · 16 km away
  26. 1.67 km E of Geyserville, California · 17792 days ago · 6 km deep · 13 km away
  27. 2.79 km NNE of Larkfield-Wikiup, California · 17792 days ago · 3 km deep · 27 km away
  28. 3.04 km ENE of Willits, California · 17791 days ago · 2 km deep · 80 km away
  29. 2.410 km SE of Comptche, California · 17791 days ago · 7 km deep · 74 km away
  30. 1.68 km W of Cobb, California · 17790 days ago · 0 km deep · 1 km away
  31. 1.57 km WSW of Cobb, California · 17789 days ago · 1 km deep · 1 km away
  32. 2.810 km NE of Healdsburg, California · 17789 days ago · 6 km deep · 17 km away
  33. 1.97 km WSW of Cobb, California · 17788 days ago · 1 km deep · 1 km away
  34. 2.410 km NE of Healdsburg, California · 17788 days ago · 5 km deep · 17 km away
  35. 1.57 km W of Cobb, California · 17787 days ago · 1 km deep · 1 km away
  36. 2.110 km NE of Healdsburg, California · 17786 days ago · 3 km deep · 17 km away
  37. 2.56 km W of Cobb, California · 17786 days ago · 3 km deep · 1 km away
  38. 1.96 km SSE of Moskowite Corner, California · 17785 days ago · 4 km deep · 72 km away
  39. 2.32 km SSW of Monument Hills, California · 17785 days ago · 10 km deep · 82 km away
  40. 1.93 km NE of Santa Rosa, California · 17784 days ago · 8 km deep · 40 km away
  41. 1.66 km NNW of Cobb, California · 17784 days ago · 3 km deep · 9 km away
  42. 1.96 km S of Clear Lake Riviera, California · 17784 days ago · 1 km deep · 12 km away
  43. 1.76 km WSW of Cobb, California · 17784 days ago · 1 km deep · 1 km away
  44. 2.78 km W of Cobb, California · 17784 days ago · 0 km deep · 1 km away
  45. 2.28 km W of Cobb, California · 17784 days ago · 0 km deep · 1 km away
  46. 2.36 km W of Cobb, California · 17783 days ago · 3 km deep · 1 km away
  47. 3.08 km WSW of Cobb, California · 17783 days ago · 0 km deep · 1 km away
  48. 1.58 km W of Cobb, California · 17783 days ago · 1 km deep · 1 km away
  49. 2.47 km W of Cobb, California · 17783 days ago · 3 km deep · 0 km away
  50. 1.97 km WSW of Cobb, California · 17783 days ago · 0 km deep · 1 km away
  51. 3.16 km WSW of Cobb, California · 17783 days ago · 0 km deep · 1 km away
  52. 1.66 km WSW of Cobb, California · 17783 days ago · -1 km deep · 1 km away
  53. 2.54 km WNW of Ukiah, California · 17782 days ago · 10 km deep · 55 km away
  54. 2.23 km WNW of Ukiah, California · 17782 days ago · 9 km deep · 54 km away
  55. 3.44 km NW of Ukiah, California · 17782 days ago · 7 km deep · 55 km away
  56. 3.34 km WNW of Ukiah, California · 17780 days ago · 11 km deep · 55 km away
  57. 2.06 km W of Cobb, California · 17779 days ago · 3 km deep · 1 km away
  58. 1.99 km E of Hidden Valley Lake, California · 17779 days ago · 8 km deep · 31 km away
  59. 2.16 km W of Cobb, California · 17778 days ago · 1 km deep · 1 km away
  60. 2.58 km W of Cobb, California · 17776 days ago · 1 km deep · 1 km away

The first 60 of 98.

Before

  1. 1.96 km W of Cobb, California · 17810 days ago · 3 km deep · 1 km away
  2. 1.712 km NNE of Angwin, California · 17810 days ago · 10 km deep · 37 km away
  3. 2.37 km WSW of Cobb, California · 17810 days ago · 4 km deep · 1 km away
  4. 2.37 km ENE of Vallejo, California · 17811 days ago · 0 km deep · 94 km away
  5. 1.76 km WSW of Cobb, California · 17811 days ago · -1 km deep · 1 km away
  6. 2.38 km WSW of Cobb, California · 17813 days ago · 3 km deep · 2 km away
  7. 2.216 km NE of Nice, California · 17814 days ago · 9 km deep · 47 km away
  8. 2.010 km W of North Lakeport, California · 17815 days ago · 5 km deep · 37 km away
  9. 2.26 km WNW of Napa, California · 17815 days ago · 6 km deep · 67 km away
  10. 2.47 km E of Willits, California · 17816 days ago · 7 km deep · 77 km away
  11. 1.88 km WSW of Cobb, California · 17816 days ago · 0 km deep · 1 km away
  12. 1.97 km W of Cobb, California · 17816 days ago · 3 km deep · 1 km away
  13. 2.97 km WSW of Cobb, California · 17817 days ago · 1 km deep · 1 km away
  14. 2.63 km NW of Redwood Valley, California · 17820 days ago · 2 km deep · 64 km away
  15. 2.36 km W of Manchester, California · 17822 days ago · 8 km deep · 84 km away
  16. 1.710 km NE of Healdsburg, California · 17824 days ago · 5 km deep · 16 km away
  17. 3.010 km NE of Healdsburg, California · 17824 days ago · 6 km deep · 16 km away
  18. 1.57 km W of Cobb, California · 17824 days ago · 3 km deep · 1 km away
  19. 2.17 km SW of Calistoga, California · 17825 days ago · 6 km deep · 36 km away
  20. 1.68 km W of Saint Helena, California · 17825 days ago · 6 km deep · 41 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038201. Read Tue, Sep 22, 2026, 9:19 AM UTC.