California earthquakes

M1.8 earthquake 5 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 5 km WSW of Cobb, California on Fri, Oct 28, 1983, 1:43 PM PDT (20:43 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.1 7 km W 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1983-10-28 20:43:07 UTC
Depth
-0.4 km (-0.2 mi), shallow
Epicenter
38.795° N, 122.780° 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
±0.15
Depth from
From location
Station coverage gap
57°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 181 in the 60 days after this one and 97 in the 30 days before it.

After

  1. 2.07 km NNE of Hidden Valley Lake, California · 15681 days ago · -1 km deep · 24 km away
  2. 3.06 km W of Cobb, California · 15681 days ago · 0 km deep · 3 km away
  3. 1.74 km E of Geyserville, California · 15680 days ago · 5 km deep · 11 km away
  4. 1.65 km WSW of Cobb, California · 15679 days ago · 0 km deep · 0 km away
  5. 1.67 km WSW of Cobb, California · 15679 days ago · 1 km deep · 3 km away
  6. 2.38 km WSW of Cobb, California · 15679 days ago · 2 km deep · 4 km away
  7. 2.06 km W of Cobb, California · 15679 days ago · 3 km deep · 3 km away
  8. 1.75 km NE of Black Point-Green Point, California · 15679 days ago · 6 km deep · 76 km away
  9. 2.44 km ESE of Sonoma, California · 15678 days ago · 8 km deep · 66 km away
  10. 2.37 km WSW of Cobb, California · 15678 days ago · 2 km deep · 2 km away
  11. 1.74 km SSW of Cobb, California · 15678 days ago · -1 km deep · 4 km away
  12. 1.76 km WSW of Cobb, California · 15678 days ago · 2 km deep · 2 km away
  13. 1.623 km N of Potter Valley, California · 15678 days ago · -1 km deep · 87 km away
  14. 1.512 km NE of Comptche, California · 15678 days ago · 2 km deep · 86 km away
  15. 1.54 km WSW of Cobb, California · 15677 days ago · 0 km deep · 1 km away
  16. 2.61 km NNE of San Pablo, California · 15677 days ago · 5 km deep · 99 km away
  17. 1.61 km ENE of Geyserville, California · 15677 days ago · 5 km deep · 13 km away
  18. 1.59 km WSW of Hopland, California · 15677 days ago · 8 km deep · 41 km away
  19. 2.05 km WSW of Cobb, California · 15676 days ago · -1 km deep · 2 km away
  20. 1.9Northern California · 15676 days ago · 3 km deep · 3 km away
  21. 1.88 km ENE of Brooktrails, California · 15676 days ago · 9 km deep · 88 km away
  22. 2.1Northern California · 15676 days ago · 2 km deep · 4 km away
  23. 1.61 km SW of Hopland, California · 15675 days ago · 0 km deep · 35 km away
  24. 1.66 km WSW of Cobb, California · 15675 days ago · 3 km deep · 1 km away
  25. 1.83 km WNW of Hopland, California · 15675 days ago · 8 km deep · 39 km away
  26. 2.07 km SW of Calistoga, California · 15675 days ago · 7 km deep · 31 km away
  27. 1.88 km WSW of Cobb, California · 15675 days ago · 3 km deep · 3 km away
  28. 1.59 km NNE of Hidden Valley Lake, California · 15675 days ago · 2 km deep · 26 km away
  29. 1.54 km ESE of Clearlake Oaks, California · 15674 days ago · -1 km deep · 27 km away
  30. 1.67 km E of Willits, California · 15673 days ago · 8 km deep · 80 km away
  31. 1.611 km W of Jenner, California · 15673 days ago · 6 km deep · 57 km away
  32. 1.63 km WNW of Hopland, California · 15673 days ago · 2 km deep · 39 km away
  33. 1.98 km WSW of Cobb, California · 15673 days ago · 1 km deep · 4 km away
  34. 1.610 km SSW of Hopland, California · 15673 days ago · -1 km deep · 33 km away
  35. 1.75 km SW of Cobb, California · 15672 days ago · 0 km deep · 0 km away
  36. 2.05 km SW of Cobb, California · 15672 days ago · -1 km deep · 1 km away
  37. 1.55 km SW of Cobb, California · 15672 days ago · 0 km deep · 0 km away
  38. 1.95 km W of Cobb, California · 15672 days ago · 0 km deep · 4 km away
  39. 1.613 km W of Cloverdale, California · 15672 days ago · 15 km deep · 34 km away
  40. 1.53 km ESE of Roseland, California · 15672 days ago · 6 km deep · 43 km away
  41. 1.86 km W of Cobb, California · 15672 days ago · 3 km deep · 4 km away
  42. 2.213 km WNW of Jenner, California · 15671 days ago · 0 km deep · 55 km away
  43. 2.012 km WNW of Jenner, California · 15671 days ago · 1 km deep · 55 km away
  44. 2.413 km W of Jenner, California · 15671 days ago · 0 km deep · 56 km away
  45. 1.85 km SW of Cobb, California · 15671 days ago · 1 km deep · 2 km away
  46. 2.216 km SSW of Point Reyes Station, California · 15671 days ago · 5 km deep · 96 km away
  47. 2.46 km SW of Cobb, California · 15671 days ago · 1 km deep · 1 km away
  48. 1.94 km N of Benicia, California · 15671 days ago · 4 km deep · 95 km away
  49. 1.79 km NE of Hidden Valley Lake, California · 15671 days ago · 2 km deep · 27 km away
  50. 1.86 km W of Cobb, California · 15671 days ago · 3 km deep · 3 km away
  51. 1.86 km W of Cobb, California · 15670 days ago · 3 km deep · 3 km away
  52. 1.57 km WSW of Cobb, California · 15670 days ago · -1 km deep · 2 km away
  53. 2.05 km SSW of Cobb, California · 15670 days ago · -1 km deep · 4 km away
  54. 1.65 km SW of Cobb, California · 15670 days ago · 0 km deep · 1 km away
  55. 1.84 km S of Cobb, California · 15669 days ago · 1 km deep · 5 km away
  56. 1.97 km W of Cobb, California · 15669 days ago · 1 km deep · 4 km away
  57. 2.16 km ENE of Santa Rosa, California · 15669 days ago · 4 km deep · 38 km away
  58. 3.116 km NE of Brooktrails, California · 15668 days ago · -1 km deep · 90 km away
  59. 1.65 km SW of Cobb, California · 15668 days ago · -1 km deep · 1 km away
  60. 1.64 km WSW of Cobb, California · 15668 days ago · 1 km deep · 1 km away

The first 60 of 181.

Before

  1. 1.515 km NNW of Potter Valley, California · 15682 days ago · 2 km deep · 81 km away
  2. 1.76 km WSW of Cobb, California · 15682 days ago · 3 km deep · 2 km away
  3. 1.75 km WSW of Cobb, California · 15682 days ago · 0 km deep · 0 km away
  4. 1.76 km WSW of Cobb, California · 15682 days ago · 1 km deep · 2 km away
  5. 2.37 km WSW of Cobb, California · 15683 days ago · 1 km deep · 2 km away
  6. 1.74 km W of Cobb, California · 15683 days ago · 0 km deep · 3 km away
  7. 1.66 km W of Cobb, California · 15683 days ago · 0 km deep · 3 km away
  8. 2.03 km WSW of Cobb, California · 15683 days ago · -1 km deep · 3 km away
  9. 2.47 km NNE of Hidden Valley Lake, California · 15683 days ago · -1 km deep · 24 km away
  10. 2.37 km NNE of Cobb, California · 15684 days ago · 2 km deep · 12 km away
  11. 1.66 km W of Cobb, California · 15685 days ago · 2 km deep · 3 km away
  12. 1.612 km N of Potter Valley, California · 15685 days ago · 8 km deep · 77 km away
  13. 1.68 km WSW of Cobb, California · 15686 days ago · 1 km deep · 4 km away
  14. 1.64 km W of Cobb, California · 15686 days ago · 0 km deep · 3 km away
  15. 1.68 km WSW of Cobb, California · 15686 days ago · 1 km deep · 4 km away
  16. 2.022 km NNE of Upper Lake, California · 15687 days ago · 8 km deep · 63 km away
  17. 2.03 km NNE of Santa Rosa, California · 15687 days ago · 7 km deep · 37 km away
  18. 2.510 km WSW of Hopland, California · 15687 days ago · 3 km deep · 42 km away
  19. 1.86 km WSW of Cobb, California · 15687 days ago · 1 km deep · 2 km away
  20. 1.64 km ENE of Willits, California · 15687 days ago · 5 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1105800. Read Sun, Oct 4, 2026, 8:44 AM UTC.