California earthquakes

M1.8 earthquake 4 km S of Cobb, California

A magnitude 1.8 earthquake struck 4 km S of Cobb, California on Mon, Oct 3, 1983, 9:14 AM PDT (16:14 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.1 16 km NE of Brooktrails, 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
1983-10-03 16:14:58 UTC
Depth
1.4 km (0.8 mi), shallow
Epicenter
38.779° N, 122.726° 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
±0.18
Depth from
From location
Station coverage gap
85°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 163 in the 60 days after this one and 99 in the 30 days before it.

After

  1. 1.618 km NNE of Upper Lake, California · 15704 days ago · -1 km deep · 61 km away
  2. 2.26 km W of Cobb, California · 15704 days ago · 3 km deep · 7 km away
  3. 1.51 km ENE of Geyserville, California · 15703 days ago · 6 km deep · 16 km away
  4. 1.55 km W of Cobb, California · 15703 days ago · 0 km deep · 7 km away
  5. 1.72 km ESE of Larkfield-Wikiup, California · 15703 days ago · 2 km deep · 31 km away
  6. 1.717 km ENE of Potter Valley, California · 15703 days ago · 7 km deep · 71 km away
  7. 1.98 km N of Cloverdale, California · 15702 days ago · 4 km deep · 28 km away
  8. 2.23 km NE of Green Valley, California · 15702 days ago · 10 km deep · 76 km away
  9. 1.57 km W of Cobb, California · 15701 days ago · 0 km deep · 9 km away
  10. 1.710 km WSW of Cobb, California · 15701 days ago · 2 km deep · 10 km away
  11. 2.06 km W of Cobb, California · 15701 days ago · 3 km deep · 8 km away
  12. 2.023 km N of Potter Valley, California · 15700 days ago · -1 km deep · 90 km away
  13. 1.70 km SW of Kelseyville, California · 15700 days ago · 1 km deep · 24 km away
  14. 1.67 km WSW of Cobb, California · 15700 days ago · 3 km deep · 8 km away
  15. 1.96 km W of Cobb, California · 15700 days ago · 3 km deep · 8 km away
  16. 2.06 km W of Cobb, California · 15698 days ago · -1 km deep · 8 km away
  17. 2.16 km W of Cobb, California · 15698 days ago · 3 km deep · 7 km away
  18. 2.55 km SW of Cobb, California · 15698 days ago · 0 km deep · 4 km away
  19. 2.25 km SW of Cobb, California · 15698 days ago · -1 km deep · 4 km away
  20. 1.86 km SW of Cobb, California · 15698 days ago · -1 km deep · 5 km away
  21. 2.25 km SW of Cobb, California · 15698 days ago · -1 km deep · 3 km away
  22. 2.43 km WNW of Dunnigan, California · 15698 days ago · 1 km deep · 64 km away
  23. 2.65 km SW of Cobb, California · 15698 days ago · 0 km deep · 4 km away
  24. 1.711 km SW of Kelseyville, California · 15697 days ago · 1 km deep · 23 km away
  25. 2.74 km SSE of Dunnigan, California · 15697 days ago · 0 km deep · 68 km away
  26. 1.519 km ENE of Potter Valley, California · 15697 days ago · 11 km deep · 71 km away
  27. 2.06 km W of Cobb, California · 15697 days ago · 3 km deep · 8 km away
  28. 1.99 km SW of Clear Lake Riviera, California · 15697 days ago · -1 km deep · 14 km away
  29. 1.620 km NNE of Upper Lake, CA · 15696 days ago · 4 km deep · 62 km away
  30. 2.56 km W of Cobb, California · 15696 days ago · 3 km deep · 8 km away
  31. 2.011 km E of Lower Lake, California · 15696 days ago · 2 km deep · 26 km away
  32. 2.4Northern California · 15696 days ago · 2 km deep · 62 km away
  33. 1.95 km WNW of Cobb, California · 15695 days ago · 0 km deep · 8 km away
  34. 1.85 km SW of Cobb, California · 15695 days ago · 0 km deep · 4 km away
  35. 1.79 km SW of Clear Lake Riviera, California · 15695 days ago · -1 km deep · 14 km away
  36. 2.06 km W of Cobb, California · 15695 days ago · 3 km deep · 8 km away
  37. 2.46 km WSW of Cobb, California · 15693 days ago · 0 km deep · 7 km away
  38. 1.96 km W of Cobb, California · 15693 days ago · 3 km deep · 8 km away
  39. 1.56 km W of Cobb, California · 15693 days ago · 1 km deep · 8 km away
  40. 2.05 km SW of Cobb, California · 15692 days ago · 1 km deep · 4 km away
  41. 1.65 km SW of Cobb, California · 15692 days ago · 0 km deep · 4 km away
  42. 1.97 km ESE of Redwood Valley, California · 15691 days ago · 5 km deep · 63 km away
  43. 1.624 km ENE of Potter Valley, California · 15691 days ago · 19 km deep · 69 km away
  44. 1.57 km E of Willits, California · 15691 days ago · 7 km deep · 84 km away
  45. 2.97 km NE of Willits, California · 15691 days ago · 0 km deep · 89 km away
  46. 1.613 km NW of Moskowite Corner, California · 15691 days ago · 9 km deep · 46 km away
  47. 1.610 km NW of Cobb, California · 15690 days ago · -1 km deep · 14 km away
  48. 1.616 km ENE of Potter Valley, California · 15690 days ago · 8 km deep · 71 km away
  49. 1.97 km WSW of Cobb, California · 15689 days ago · 2 km deep · 8 km away
  50. 1.58 km W of Cobb, California · 15689 days ago · 1 km deep · 9 km away
  51. 1.61 km SSE of Clearlake, California · 15689 days ago · 3 km deep · 20 km away
  52. 1.618 km NE of Potter Valley, California · 15688 days ago · 6 km deep · 73 km away
  53. 2.17 km NNE of Hidden Valley Lake, California · 15688 days ago · -1 km deep · 20 km away
  54. 1.65 km W of Cobb, California · 15688 days ago · 0 km deep · 7 km away
  55. 1.55 km NE of Black Point-Green Point, California · 15688 days ago · 5 km deep · 73 km away
  56. 1.67 km ENE of Lower Lake, California · 15687 days ago · 5 km deep · 24 km away
  57. 2.07 km W of Cobb, California · 15686 days ago · 4 km deep · 9 km away
  58. 1.78 km SW of Kelseyville, California · 15686 days ago · 3 km deep · 22 km away
  59. 1.59 km WSW of Cobb, California · 15686 days ago · 2 km deep · 9 km away
  60. 2.15 km SW of Cobb, California · 15686 days ago · 1 km deep · 5 km away

The first 60 of 163.

Before

  1. 1.94 km W of Cobb, California · 15705 days ago · 2 km deep · 6 km away
  2. 3.010 km NNE of Geyserville, California · 15706 days ago · 2 km deep · 11 km away
  3. 1.81 km NW of Larkfield-Wikiup, California · 15707 days ago · 0 km deep · 29 km away
  4. 1.97 km WSW of Cobb, California · 15707 days ago · 3 km deep · 7 km away
  5. 1.64 km S of Cobb, California · 15707 days ago · 1 km deep · 1 km away
  6. 2.24 km W of Cobb, California · 15708 days ago · -1 km deep · 7 km away
  7. 2.36 km W of Cobb, California · 15708 days ago · 3 km deep · 7 km away
  8. 1.7Northern California · 15708 days ago · 0 km deep · 5 km away
  9. 1.71 km WSW of Calpella, California · 15709 days ago · 4 km deep · 66 km away
  10. 1.66 km SSE of Clear Lake Riviera, California · 15709 days ago · 4 km deep · 14 km away
  11. 1.55 km WSW of Cobb, California · 15710 days ago · 2 km deep · 5 km away
  12. 1.84 km SE of Kelseyville, California · 15710 days ago · 3 km deep · 20 km away
  13. 1.710 km W of Cobb, California · 15710 days ago · 1 km deep · 11 km away
  14. 1.96 km W of Cobb, California · 15710 days ago · 3 km deep · 8 km away
  15. 1.79 km W of Cobb, California · 15710 days ago · 0 km deep · 10 km away
  16. 2.39 km W of Cobb, California · 15710 days ago · 0 km deep · 11 km away
  17. 2.49 km W of Cobb, California · 15710 days ago · 0 km deep · 10 km away
  18. 1.69 km W of Cobb, California · 15710 days ago · 0 km deep · 11 km away
  19. 3.59 km W of Cobb, California · 15710 days ago · 0 km deep · 10 km away
  20. 1.65 km E of Willits, California · 15711 days ago · 5 km deep · 85 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1104232. Read Thu, Oct 1, 2026, 8:13 PM UTC.