California earthquakes

M1.7 earthquake 6 km W of Cobb, California

A magnitude 1.7 earthquake struck 6 km W of Cobb, California on Thu, Jun 23, 1983, 4:56 AM PDT (11:56 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.6 2 km SSE of Point Arena, 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
1983-06-23 11:56:49 UTC
Depth
2.6 km (1.6 mi), shallow
Epicenter
38.821° N, 122.801° 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
±0.11
Depth from
From location
Station coverage gap
116°
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: 178 in the 60 days after this one and 91 in the 30 days before it.

After

  1. 1.76 km S of Green Valley, California · 15809 days ago · 7 km deep · 89 km away
  2. 1.61 km ESE of Geyserville, California · 15808 days ago · 5 km deep · 15 km away
  3. 2.06 km WSW of Cobb, California · 15808 days ago · 3 km deep · 2 km away
  4. 1.57 km WSW of Cobb, California · 15808 days ago · 1 km deep · 2 km away
  5. 1.714 km ENE of Potter Valley, California · 15807 days ago · -1 km deep · 64 km away
  6. 2.519 km NE of Potter Valley, California · 15807 days ago · 7 km deep · 71 km away
  7. 1.84 km WSW of Cobb, California · 15806 days ago · 2 km deep · 3 km away
  8. 2.67 km WSW of Cobb, California · 15806 days ago · 1 km deep · 2 km away
  9. 1.85 km N of Cobb, California · 15806 days ago · 0 km deep · 10 km away
  10. 1.87 km WSW of Cobb, California · 15806 days ago · 2 km deep · 2 km away
  11. 1.84 km E of Boonville, California · 15806 days ago · 7 km deep · 49 km away
  12. 1.84 km W of Cobb, California · 15806 days ago · 0 km deep · 2 km away
  13. 2.16 km ENE of Santa Rosa, California · 15806 days ago · 10 km deep · 42 km away
  14. 2.57 km W of Cobb, California · 15805 days ago · 0 km deep · 1 km away
  15. 1.78 km WSW of Cobb, California · 15805 days ago · 4 km deep · 4 km away
  16. 1.73 km W of Clear Lake Riviera, California · 15804 days ago · 5 km deep · 15 km away
  17. 1.56 km ENE of Healdsburg, California · 15804 days ago · 3 km deep · 21 km away
  18. 1.77 km WSW of Cobb, California · 15804 days ago · 3 km deep · 3 km away
  19. 1.65 km SSE of Clear Lake Riviera, California · 15802 days ago · 4 km deep · 13 km away
  20. 2.49 km WSW of Cobb, California · 15802 days ago · 2 km deep · 3 km away
  21. 1.713 km ESE of Hidden Valley Lake, California · 15802 days ago · 2 km deep · 34 km away
  22. 2.36 km W of Cobb, California · 15802 days ago · 3 km deep · 0 km away
  23. 2.18 km WSW of Cobb, California · 15801 days ago · 0 km deep · 3 km away
  24. 1.67 km NW of Cobb, California · 15801 days ago · -1 km deep · 6 km away
  25. 2.34 km S of Cobb, California · 15801 days ago · 0 km deep · 8 km away
  26. 1.63 km SSW of Cobb, California · 15801 days ago · 0 km deep · 6 km away
  27. 1.66 km WSW of Cobb, California · 15800 days ago · 0 km deep · 4 km away
  28. 1.77 km WSW of Cobb, California · 15800 days ago · 1 km deep · 2 km away
  29. 1.54 km NW of Redwood Valley, California · 15799 days ago · 4 km deep · 65 km away
  30. 2.07 km W of Cobb, California · 15799 days ago · 1 km deep · 2 km away
  31. 1.78 km NE of Hopland, California · 15799 days ago · 5 km deep · 31 km away
  32. 2.18 km NE of Hopland, California · 15799 days ago · 4 km deep · 31 km away
  33. 1.56 km NE of Rohnert Park, California · 15798 days ago · 0 km deep · 51 km away
  34. 2.01 km SSE of Green Valley, California · 15798 days ago · 11 km deep · 85 km away
  35. 2.314 km SE of Laytonville, California · 15798 days ago · 8 km deep · 99 km away
  36. 2.07 km W of Cobb, California · 15798 days ago · 3 km deep · 0 km away
  37. 2.37 km E of Clearlake Oaks, California · 15798 days ago · -1 km deep · 30 km away
  38. 2.07 km E of Clearlake Oaks, California · 15798 days ago · -1 km deep · 30 km away
  39. 2.16 km W of Cobb, California · 15798 days ago · 1 km deep · 1 km away
  40. 2.27 km WSW of Cobb, California · 15797 days ago · 1 km deep · 1 km away
  41. 1.618 km NNE of Upper Lake, California · 15797 days ago · -1 km deep · 54 km away
  42. 2.418 km NE of Upper Lake, California · 15797 days ago · 6 km deep · 54 km away
  43. 1.618 km NE of Upper Lake, California · 15797 days ago · 0 km deep · 53 km away
  44. 1.67 km WSW of Cobb, California · 15796 days ago · 3 km deep · 3 km away
  45. 1.68 km WSW of Cobb, California · 15796 days ago · 0 km deep · 3 km away
  46. 1.88 km W of Cobb, California · 15796 days ago · 1 km deep · 2 km away
  47. 1.67 km S of Cobb, California · 15796 days ago · -1 km deep · 11 km away
  48. 1.9Northern California · 15795 days ago · 2 km deep · 1 km away
  49. 2.09 km WSW of Cobb, California · 15794 days ago · 1 km deep · 3 km away
  50. 1.5Northern California · 15793 days ago · 1 km deep · 1 km away
  51. 2.316 km ENE of Potter Valley, California · 15793 days ago · 8 km deep · 64 km away
  52. 2.6near the coast of Northern California · 15793 days ago · 8 km deep · 99 km away
  53. 2.37 km W of Cobb, California · 15793 days ago · 3 km deep · 1 km away
  54. 1.57 km WSW of Cobb, California · 15792 days ago · 2 km deep · 2 km away
  55. 1.68 km W of Cobb, California · 15792 days ago · 1 km deep · 2 km away
  56. 1.87 km W of Cobb, California · 15791 days ago · 3 km deep · 1 km away
  57. 2.17 km N of Cobb, California · 15791 days ago · 2 km deep · 9 km away
  58. 1.77 km S of Cobb, California · 15791 days ago · -1 km deep · 11 km away
  59. 1.67 km WSW of Cobb, California · 15791 days ago · 0 km deep · 2 km away
  60. 1.83 km N of Larkfield-Wikiup, California · 15791 days ago · 7 km deep · 31 km away

The first 60 of 178.

Before

  1. 1.96 km E of Clearlake Oaks, California · 15809 days ago · 2 km deep · 28 km away
  2. 1.64 km W of Clear Lake Riviera, California · 15812 days ago · 4 km deep · 15 km away
  3. 1.99 km WSW of Cobb, California · 15812 days ago · 1 km deep · 3 km away
  4. 1.54 km W of Clear Lake Riviera, California · 15812 days ago · 3 km deep · 15 km away
  5. 1.86 km SW of Cobb, California · 15812 days ago · 1 km deep · 4 km away
  6. 1.65 km W of Cobb, California · 15812 days ago · 1 km deep · 2 km away
  7. 3.26 km W of Cobb, California · 15812 days ago · 4 km deep · 1 km away
  8. 1.73 km W of Clear Lake Riviera, California · 15812 days ago · 3 km deep · 16 km away
  9. 2.43 km W of Clear Lake Riviera, California · 15812 days ago · 3 km deep · 15 km away
  10. 2.62 km W of Clear Lake Riviera, California · 15812 days ago · 3 km deep · 15 km away
  11. 1.53 km W of Clear Lake Riviera, California · 15812 days ago · 0 km deep · 15 km away
  12. 1.612 km N of Brooktrails, California · 15812 days ago · 7 km deep · 95 km away
  13. 1.63 km W of Clear Lake Riviera, California · 15812 days ago · 4 km deep · 15 km away
  14. 1.53 km W of Clear Lake Riviera, California · 15813 days ago · 4 km deep · 15 km away
  15. 1.99 km WSW of Cobb, California · 15813 days ago · 0 km deep · 3 km away
  16. 2.52 km W of Clear Lake Riviera, California · 15813 days ago · 4 km deep · 16 km away
  17. 2.16 km WSW of Cobb, California · 15813 days ago · 4 km deep · 2 km away
  18. 2.13 km ESE of Clearlake, California · 15814 days ago · 3 km deep · 23 km away
  19. 1.66 km W of Cobb, California · 15814 days ago · 3 km deep · 0 km away
  20. 1.76 km ENE of Penngrove, California · 15815 days ago · 5 km deep · 58 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1097411. Read Sun, Oct 4, 2026, 9:40 PM UTC.