California earthquakes

M1.8 earthquake 4 km S of Cobb, California

A magnitude 1.8 earthquake struck 4 km S of Cobb, California on Fri, Apr 22, 1983, 6:59 PM PST (02:59 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.4 7 km WSW of Cobb, 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
1.8 (md), micro
Local time
UTC
1983-04-23 02:59:39 UTC
Depth
1.1 km (0.7 mi), shallow
Epicenter
38.781° N, 122.730° 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 0.3 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
57°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 145 in the 60 days after this one and 78 in the 30 days before it.

After

  1. 1.94 km S of Cobb, California · 15866 days ago · 2 km deep · 1 km away
  2. 2.56 km WSW of Cobb, California · 15865 days ago · 0 km deep · 6 km away
  3. 1.96 km WSW of Cobb, California · 15865 days ago · 1 km deep · 6 km away
  4. 1.6near the coast of Northern California · 15865 days ago · 3 km deep · 63 km away
  5. 1.77 km WSW of Cobb, California · 15864 days ago · 3 km deep · 7 km away
  6. 2.26 km SW of Cobb, California · 15864 days ago · 0 km deep · 4 km away
  7. 1.88 km SW of Calistoga, California · 15864 days ago · 4 km deep · 30 km away
  8. 1.63 km ENE of Calistoga, California · 15863 days ago · 4 km deep · 27 km away
  9. 2.110 km ENE of Cloverdale, California · 15862 days ago · 4 km deep · 16 km away
  10. 1.53 km ENE of Calistoga, California · 15862 days ago · 0 km deep · 26 km away
  11. 2.07 km WSW of Cobb, California · 15862 days ago · 0 km deep · 7 km away
  12. 1.920 km NE of Potter Valley, California · 15861 days ago · 13 km deep · 75 km away
  13. 2.06 km WSW of Cobb, California · 15860 days ago · 3 km deep · 6 km away
  14. 1.89 km NNE of Brooktrails, California · 15860 days ago · 8 km deep · 97 km away
  15. 1.85 km W of Cobb, California · 15859 days ago · 2 km deep · 7 km away
  16. 2.17 km W of Cobb, California · 15859 days ago · 3 km deep · 8 km away
  17. 1.57 km W of Cobb, California · 15859 days ago · 3 km deep · 8 km away
  18. 1.88 km W of Cobb, California · 15859 days ago · 3 km deep · 8 km away
  19. 1.618 km NE of Upper Lake, California · 15858 days ago · 10 km deep · 58 km away
  20. 1.62 km NE of Clearlake, California · 15858 days ago · -1 km deep · 24 km away
  21. 1.64 km SW of Cobb, California · 15858 days ago · -1 km deep · 4 km away
  22. 2.09 km WSW of Cobb, California · 15855 days ago · 2 km deep · 9 km away
  23. 2.47 km WSW of Cobb, California · 15855 days ago · 2 km deep · 7 km away
  24. 1.53 km E of Hopland, California · 15854 days ago · 1 km deep · 37 km away
  25. 1.67 km WSW of Cobb, California · 15853 days ago · 3 km deep · 7 km away
  26. 1.67 km WSW of Cobb, California · 15853 days ago · 3 km deep · 7 km away
  27. 1.91 km SE of Calpella, California · 15852 days ago · 3 km deep · 63 km away
  28. 1.62 km SE of Clear Lake Riviera, California · 15851 days ago · 1 km deep · 18 km away
  29. 2.05 km W of Cobb, California · 15851 days ago · 0 km deep · 7 km away
  30. 2.28 km WSW of Cobb, California · 15851 days ago · 3 km deep · 8 km away
  31. 1.72 km SE of Clear Lake Riviera, California · 15851 days ago · 0 km deep · 18 km away
  32. 1.618 km NE of Sea Ranch, California · 15851 days ago · 9 km deep · 50 km away
  33. 1.77 km W of Cobb, California · 15850 days ago · 5 km deep · 8 km away
  34. 1.922 km NNE of Potter Valley, California · 15850 days ago · 5 km deep · 84 km away
  35. 1.524 km SE of Covelo, California · 15849 days ago · 5 km deep · 98 km away
  36. 1.826 km N of Potter Valley, California · 15849 days ago · 0 km deep · 92 km away
  37. 1.77 km W of Cobb, California · 15849 days ago · 2 km deep · 8 km away
  38. 1.96 km SW of Cobb, California · 15846 days ago · 1 km deep · 4 km away
  39. 1.79 km E of Geyserville, California · 15846 days ago · 5 km deep · 11 km away
  40. 1.99 km W of Calpella, California · 15844 days ago · 14 km deep · 71 km away
  41. 1.76 km WSW of Cobb, California · 15844 days ago · 2 km deep · 5 km away
  42. 1.55 km SW of Cobb, California · 15843 days ago · 1 km deep · 4 km away
  43. 2.35 km SW of Cobb, California · 15841 days ago · 0 km deep · 4 km away
  44. 1.65 km W of Cobb, California · 15841 days ago · 1 km deep · 8 km away
  45. 1.87 km W of Cobb, California · 15841 days ago · 3 km deep · 8 km away
  46. 1.86 km SW of Cobb, California · 15840 days ago · 3 km deep · 4 km away
  47. 1.67 km WSW of Cobb, California · 15839 days ago · 1 km deep · 7 km away
  48. 1.714 km WSW of Calpella, California · 15839 days ago · 2 km deep · 72 km away
  49. 2.213 km SW of Willits, California · 15838 days ago · 0 km deep · 87 km away
  50. 2.59 km WSW of Cobb, California · 15838 days ago · 1 km deep · 9 km away
  51. 1.67 km WSW of Cobb, California · 15837 days ago · 1 km deep · 7 km away
  52. 2.47 km WSW of Cobb, California · 15836 days ago · 4 km deep · 7 km away
  53. 1.67 km W of Cobb, California · 15836 days ago · 3 km deep · 8 km away
  54. 1.66 km WSW of Cobb, California · 15836 days ago · 3 km deep · 7 km away
  55. 1.65 km W of Cobb, California · 15835 days ago · 6 km deep · 7 km away
  56. 1.91 km W of American Canyon, California · 15834 days ago · 4 km deep · 78 km away
  57. 2.37 km WSW of Cobb, California · 15834 days ago · 1 km deep · 7 km away
  58. 1.67 km WSW of Cobb, California · 15833 days ago · 2 km deep · 7 km away
  59. 1.84 km SW of Calistoga, California · 15833 days ago · -1 km deep · 28 km away
  60. 2.08 km WSW of Cobb, California · 15833 days ago · 4 km deep · 8 km away

The first 60 of 145.

Before

  1. 1.69 km ESE of Hidden Valley Lake, California · 15866 days ago · 4 km deep · 24 km away
  2. 1.55 km ENE of Willits, California · 15866 days ago · 3 km deep · 88 km away
  3. 1.86 km W of Kenwood, California · 15866 days ago · 8 km deep · 43 km away
  4. 2.04 km SSE of Clear Lake Riviera, California · 15867 days ago · 3 km deep · 16 km away
  5. 2.14 km SW of Cobb, California · 15867 days ago · -1 km deep · 3 km away
  6. 1.65 km SW of Cobb, California · 15867 days ago · 0 km deep · 4 km away
  7. 1.818 km E of Potter Valley, California · 15867 days ago · 8 km deep · 64 km away
  8. 3.118 km E of Potter Valley, California · 15867 days ago · 10 km deep · 64 km away
  9. 2.012 km ENE of Hidden Valley Lake, California · 15867 days ago · 6 km deep · 28 km away
  10. 1.95 km SSW of Cobb, California · 15868 days ago · -1 km deep · 1 km away
  11. 1.58 km WSW of Cobb, California · 15868 days ago · 6 km deep · 8 km away
  12. 1.57 km WSW of Cobb, California · 15869 days ago · 3 km deep · 7 km away
  13. 3.47 km WSW of Cobb, California · 15869 days ago · 4 km deep · 7 km away
  14. 1.94 km S of Cobb, California · 15869 days ago · 1 km deep · 0 km away
  15. 1.56 km W of Cobb, California · 15869 days ago · 3 km deep · 7 km away
  16. 1.85 km SW of Kenwood, California · 15870 days ago · 11 km deep · 46 km away
  17. 3.56 km W of Cobb, California · 15870 days ago · 3 km deep · 7 km away
  18. 1.97 km WSW of Cobb, California · 15870 days ago · 0 km deep · 7 km away
  19. 1.922 km NE of Potter Valley, California · 15871 days ago · 6 km deep · 79 km away
  20. 1.67 km WSW of Cobb, California · 15871 days ago · 1 km deep · 7 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1090761. Read Tue, Sep 29, 2026, 7:31 PM UTC.