California earthquakes

M1.7 earthquake 7 km W of Cobb, California

A magnitude 1.7 earthquake struck 7 km W of Cobb, California on Tue, Dec 27, 1983, 2:38 PM PST (22:38 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M1.8 6 km ENE of Windsor, 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
1.7 (md), micro
Local time
UTC
1983-12-27 22:38:19 UTC
Depth
0.6 km (0.4 mi), shallow
Epicenter
38.832° N, 122.807° 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, 0.4 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
102°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 166 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.715 km NE of Angwin, California · 15595 days ago · 20 km deep · 44 km away
  2. 1.86 km ENE of Windsor, California · 15595 days ago · 1 km deep · 29 km away
  3. 2.16 km W of Cobb, California · 15595 days ago · 1 km deep · 2 km away
  4. 1.67 km WSW of Cobb, California · 15594 days ago · 1 km deep · 3 km away
  5. 1.818 km NNE of Upper Lake, California · 15594 days ago · 7 km deep · 54 km away
  6. 1.97 km S of Willows, California · 15594 days ago · 24 km deep · 87 km away
  7. 1.76 km W of Cobb, California · 15594 days ago · 3 km deep · 1 km away
  8. 2.36 km WSW of Cobb, California · 15594 days ago · 0 km deep · 3 km away
  9. 1.86 km WSW of Cobb, California · 15594 days ago · 3 km deep · 4 km away
  10. 1.96 km W of Cobb, California · 15593 days ago · 4 km deep · 2 km away
  11. 1.67 km ENE of Black Point-Green Point, California · 15593 days ago · 16 km deep · 82 km away
  12. 1.97 km WSW of Cobb, California · 15592 days ago · 1 km deep · 3 km away
  13. 2.57 km WSW of Cobb, California · 15592 days ago · 1 km deep · 3 km away
  14. 2.15 km SW of Cobb, California · 15592 days ago · 0 km deep · 7 km away
  15. 1.59 km WSW of Cobb, California · 15592 days ago · 1 km deep · 4 km away
  16. 1.97 km WSW of Cobb, California · 15592 days ago · 2 km deep · 3 km away
  17. 2.26 km W of Cobb, California · 15591 days ago · 0 km deep · 3 km away
  18. 1.6Northern California · 15591 days ago · 1 km deep · 5 km away
  19. 1.55 km WSW of Cobb, California · 15591 days ago · 0 km deep · 4 km away
  20. 1.77 km WSW of Cobb, California · 15591 days ago · 1 km deep · 3 km away
  21. 2.69 km WSW of Cobb, California · 15591 days ago · 2 km deep · 4 km away
  22. 1.75 km WSW of Cobb, California · 15591 days ago · 3 km deep · 5 km away
  23. 2.69 km WSW of Cobb, California · 15591 days ago · 2 km deep · 4 km away
  24. 1.621 km NE of Potter Valley, California · 15591 days ago · 5 km deep · 69 km away
  25. 1.57 km WSW of Cobb, California · 15588 days ago · 3 km deep · 4 km away
  26. 1.57 km WSW of Cobb, California · 15588 days ago · 3 km deep · 4 km away
  27. 1.68 km ENE of Hidden Valley Lake, California · 15588 days ago · 7 km deep · 30 km away
  28. 1.76 km W of Cobb, California · 15588 days ago · 3 km deep · 2 km away
  29. 2.46 km W of Cobb, California · 15587 days ago · 3 km deep · 2 km away
  30. 2.66 km W of Cobb, California · 15587 days ago · 2 km deep · 2 km away
  31. 1.77 km W of Cobb, California · 15587 days ago · 3 km deep · 2 km away
  32. 1.714 km S of Lodoga, California · 15587 days ago · 15 km deep · 46 km away
  33. 1.64 km SSW of Cobb, California · 15587 days ago · -1 km deep · 8 km away
  34. 2.36 km W of Cobb, California · 15586 days ago · 1 km deep · 1 km away
  35. 1.69 km SSE of Sea Ranch, California · 15586 days ago · 2 km deep · 56 km away
  36. 1.914 km NE of Upper Lake, California · 15586 days ago · 7 km deep · 49 km away
  37. 1.97 km WSW of Cobb, California · 15585 days ago · 2 km deep · 3 km away
  38. 2.07 km W of Cobb, California · 15585 days ago · 3 km deep · 2 km away
  39. 1.612 km NNW of Moskowite Corner, California · 15585 days ago · 2 km deep · 58 km away
  40. 1.622 km NE of Potter Valley, California · 15585 days ago · 7 km deep · 72 km away
  41. 1.68 km WSW of Cobb, California · 15585 days ago · 3 km deep · 4 km away
  42. 2.14 km NW of Kelseyville, California · 15584 days ago · 4 km deep · 21 km away
  43. 1.65 km WSW of Cobb, California · 15584 days ago · 1 km deep · 4 km away
  44. 2.26 km W of Cobb, California · 15583 days ago · 3 km deep · 1 km away
  45. 1.68 km WSW of Cobb, California · 15583 days ago · 3 km deep · 4 km away
  46. 2.46 km W of Cobb, California · 15583 days ago · 3 km deep · 2 km away
  47. 1.76 km W of Cobb, California · 15583 days ago · 3 km deep · 2 km away
  48. 1.9near the coast of Northern California · 15581 days ago · 8 km deep · 75 km away
  49. 2.415 km W of Guinda, California · 15581 days ago · 8 km deep · 38 km away
  50. 2.0Northern California · 15581 days ago · 3 km deep · 1 km away
  51. 1.78 km WNW of Cobb, California · 15581 days ago · 0 km deep · 4 km away
  52. 1.77 km WSW of Cobb, California · 15581 days ago · 2 km deep · 3 km away
  53. 1.76 km WSW of Cobb, California · 15580 days ago · 3 km deep · 4 km away
  54. 1.66 km WSW of Cobb, California · 15580 days ago · 1 km deep · 3 km away
  55. 1.87 km W of Cobb, California · 15580 days ago · 3 km deep · 2 km away
  56. 1.58 km WSW of Cobb, California · 15580 days ago · 3 km deep · 3 km away
  57. 1.76 km W of Cobb, California · 15580 days ago · 3 km deep · 1 km away
  58. 1.97 km W of Cobb, California · 15579 days ago · 3 km deep · 2 km away
  59. 1.90 km S of Deer Park, California · 15579 days ago · 11 km deep · 45 km away
  60. 1.97 km WSW of Cobb, California · 15579 days ago · 3 km deep · 5 km away

The first 60 of 166.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1109177. Read Tue, Sep 22, 2026, 10:28 AM UTC.