California earthquakes

M1.7 earthquake 6 km W of Cobb, California

A magnitude 1.7 earthquake struck 6 km W of Cobb, California on Sun, Sep 25, 1983, 1:18 PM PDT (20:18 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.5 9 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
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1983-09-25 20:18:58 UTC
Depth
3.0 km (1.8 mi), shallow
Epicenter
38.821° N, 122.802° 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
±0.09
Depth from
From location
Station coverage gap
52°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 164 in the 60 days after this one and 93 in the 30 days before it.

After

  1. 1.96 km W of Cobb, California · 15713 days ago · 0 km deep · 1 km away
  2. 1.56 km W of Cobb, California · 15713 days ago · 3 km deep · 0 km away
  3. 1.66 km W of Cobb, California · 15713 days ago · 2 km deep · 0 km away
  4. 1.79 km WSW of Cobb, California · 15712 days ago · 2 km deep · 3 km away
  5. 2.19 km WSW of Cobb, California · 15712 days ago · 2 km deep · 3 km away
  6. 2.16 km E of Clearlake Oaks, California · 15712 days ago · 2 km deep · 28 km away
  7. 1.87 km E of Clearlake Oaks, California · 15712 days ago · 5 km deep · 29 km away
  8. 1.65 km E of Willits, California · 15712 days ago · 5 km deep · 77 km away
  9. 3.59 km W of Cobb, California · 15711 days ago · 0 km deep · 3 km away
  10. 1.69 km W of Cobb, California · 15711 days ago · 0 km deep · 3 km away
  11. 2.49 km W of Cobb, California · 15711 days ago · 0 km deep · 3 km away
  12. 2.39 km W of Cobb, California · 15711 days ago · 0 km deep · 3 km away
  13. 1.79 km W of Cobb, California · 15711 days ago · 0 km deep · 2 km away
  14. 1.96 km W of Cobb, California · 15711 days ago · 3 km deep · 1 km away
  15. 1.710 km W of Cobb, California · 15711 days ago · 1 km deep · 3 km away
  16. 1.84 km SE of Kelseyville, California · 15711 days ago · 3 km deep · 15 km away
  17. 1.55 km WSW of Cobb, California · 15711 days ago · 2 km deep · 3 km away
  18. 1.66 km SSE of Clear Lake Riviera, California · 15710 days ago · 4 km deep · 14 km away
  19. 1.71 km WSW of Calpella, California · 15710 days ago · 4 km deep · 58 km away
  20. 1.7Northern California · 15709 days ago · 0 km deep · 3 km away
  21. 2.36 km W of Cobb, California · 15708 days ago · 3 km deep · 1 km away
  22. 2.24 km W of Cobb, California · 15708 days ago · -1 km deep · 2 km away
  23. 1.64 km S of Cobb, California · 15708 days ago · 1 km deep · 8 km away
  24. 1.97 km WSW of Cobb, California · 15707 days ago · 3 km deep · 3 km away
  25. 1.81 km NW of Larkfield-Wikiup, California · 15707 days ago · 0 km deep · 33 km away
  26. 3.010 km NNE of Geyserville, California · 15707 days ago · 2 km deep · 5 km away
  27. 1.94 km W of Cobb, California · 15706 days ago · 2 km deep · 3 km away
  28. 1.84 km S of Cobb, California · 15705 days ago · 1 km deep · 8 km away
  29. 1.618 km NNE of Upper Lake, California · 15705 days ago · -1 km deep · 56 km away
  30. 2.26 km W of Cobb, California · 15705 days ago · 3 km deep · 1 km away
  31. 1.51 km ENE of Geyserville, California · 15704 days ago · 6 km deep · 14 km away
  32. 1.55 km W of Cobb, California · 15704 days ago · 0 km deep · 1 km away
  33. 1.72 km ESE of Larkfield-Wikiup, California · 15704 days ago · 2 km deep · 36 km away
  34. 1.717 km ENE of Potter Valley, California · 15703 days ago · 7 km deep · 65 km away
  35. 1.98 km N of Cloverdale, California · 15703 days ago · 4 km deep · 20 km away
  36. 2.23 km NE of Green Valley, California · 15703 days ago · 10 km deep · 84 km away
  37. 1.57 km W of Cobb, California · 15702 days ago · 0 km deep · 1 km away
  38. 1.710 km WSW of Cobb, California · 15702 days ago · 2 km deep · 4 km away
  39. 2.06 km W of Cobb, California · 15701 days ago · 3 km deep · 0 km away
  40. 2.023 km N of Potter Valley, California · 15701 days ago · -1 km deep · 83 km away
  41. 1.70 km SW of Kelseyville, California · 15701 days ago · 1 km deep · 17 km away
  42. 1.67 km WSW of Cobb, California · 15700 days ago · 3 km deep · 2 km away
  43. 1.96 km W of Cobb, California · 15700 days ago · 3 km deep · 0 km away
  44. 2.06 km W of Cobb, California · 15699 days ago · -1 km deep · 1 km away
  45. 2.16 km W of Cobb, California · 15699 days ago · 3 km deep · 1 km away
  46. 2.55 km SW of Cobb, California · 15698 days ago · 0 km deep · 5 km away
  47. 2.25 km SW of Cobb, California · 15698 days ago · -1 km deep · 5 km away
  48. 1.86 km SW of Cobb, California · 15698 days ago · -1 km deep · 4 km away
  49. 2.25 km SW of Cobb, California · 15698 days ago · -1 km deep · 5 km away
  50. 2.43 km WNW of Dunnigan, California · 15698 days ago · 1 km deep · 70 km away
  51. 2.65 km SW of Cobb, California · 15698 days ago · 0 km deep · 5 km away
  52. 1.711 km SW of Kelseyville, California · 15698 days ago · 1 km deep · 15 km away
  53. 2.74 km SSE of Dunnigan, California · 15698 days ago · 0 km deep · 74 km away
  54. 1.519 km ENE of Potter Valley, California · 15698 days ago · 11 km deep · 65 km away
  55. 2.06 km W of Cobb, California · 15698 days ago · 3 km deep · 0 km away
  56. 1.99 km SW of Clear Lake Riviera, California · 15698 days ago · -1 km deep · 8 km away
  57. 1.620 km NNE of Upper Lake, CA · 15697 days ago · 4 km deep · 57 km away
  58. 2.56 km W of Cobb, California · 15697 days ago · 3 km deep · 0 km away
  59. 2.011 km E of Lower Lake, California · 15697 days ago · 2 km deep · 30 km away
  60. 2.4Northern California · 15696 days ago · 2 km deep · 56 km away

The first 60 of 164.

Before

  1. 2.8Northern California · 15713 days ago · 3 km deep · 0 km away
  2. 1.56 km W of Cobb, California · 15714 days ago · 1 km deep · 1 km away
  3. 1.56 km S of Cobb, California · 15714 days ago · 0 km deep · 10 km away
  4. 1.74 km W of Cobb, California · 15714 days ago · -1 km deep · 3 km away
  5. 2.87 km WSW of Cobb, California · 15714 days ago · 3 km deep · 2 km away
  6. 2.09 km WSW of Cobb, California · 15714 days ago · 1 km deep · 3 km away
  7. 1.75 km SW of Cobb, California · 15715 days ago · 4 km deep · 4 km away
  8. 1.97 km WSW of Cobb, California · 15715 days ago · 2 km deep · 2 km away
  9. 1.93 km NE of Santa Rosa, California · 15715 days ago · 8 km deep · 41 km away
  10. 1.57 km W of Cobb, California · 15716 days ago · 0 km deep · 1 km away
  11. 1.69 km WSW of Cobb, California · 15716 days ago · 2 km deep · 3 km away
  12. 1.513 km N of Upper Lake, California · 15717 days ago · 13 km deep · 53 km away
  13. 1.810 km W of North Lakeport, California · 15717 days ago · 5 km deep · 35 km away
  14. 1.725 km SE of Covelo, California · 15718 days ago · 5 km deep · 91 km away
  15. 1.66 km S of Cobb, California · 15718 days ago · 0 km deep · 10 km away
  16. 1.67 km W of Cobb, California · 15718 days ago · 1 km deep · 1 km away
  17. 1.98 km W of Cobb, California · 15718 days ago · 1 km deep · 1 km away
  18. 2.19 km W of Cobb, California · 15718 days ago · -1 km deep · 2 km away
  19. 2.57 km W of Cobb, California · 15718 days ago · -1 km deep · 1 km away
  20. 2.68 km W of Cobb, California · 15718 days ago · -1 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1103607. Read Fri, Oct 2, 2026, 2:30 PM UTC.