California earthquakes

M1.7 earthquake 6 km W of Cobb, California

A magnitude 1.7 earthquake struck 6 km W of Cobb, California on Sat, Sep 28, 1985, 1:57 AM PDT (08:57 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.5 6 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), micro
Local time
UTC
1985-09-28 08:57:28 UTC
Depth
2.9 km (1.8 mi), shallow
Epicenter
38.828° N, 122.797° 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 1.8 km horizontally, 6.7 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
255°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 174 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.56 km W of Cobb, California · 14960 days ago · 3 km deep · 1 km away
  2. 1.98 km SE of Hopland, California · 14960 days ago · 1 km deep · 24 km away
  3. 1.88 km WSW of Cobb, California · 14960 days ago · 3 km deep · 4 km away
  4. 1.8Northern California · 14959 days ago · 0 km deep · 2 km away
  5. 2.28 km W of Cobb, California · 14959 days ago · 0 km deep · 2 km away
  6. 2.55 km SW of Cobb, California · 14958 days ago · 0 km deep · 5 km away
  7. 1.95 km SW of Cobb, California · 14958 days ago · 0 km deep · 5 km away
  8. 1.65 km W of Cobb, California · 14958 days ago · 0 km deep · 1 km away
  9. 1.57 km WSW of Cobb, California · 14957 days ago · 1 km deep · 4 km away
  10. 2.112 km NNW of Potter Valley, California · 14957 days ago · 5 km deep · 74 km away
  11. 2.05 km SW of Cobb, California · 14956 days ago · 2 km deep · 5 km away
  12. 1.97 km NNE of Upper Lake, California · 14956 days ago · 7 km deep · 46 km away
  13. 2.67 km WSW of Glen Ellen, California · 14956 days ago · 8 km deep · 58 km away
  14. 2.04 km WSW of Cobb, California · 14956 days ago · 1 km deep · 4 km away
  15. 2.05 km WNW of Cobb, California · 14954 days ago · 2 km deep · 2 km away
  16. 2.46 km WSW of Cobb, California · 14954 days ago · -1 km deep · 3 km away
  17. 1.67 km WSW of Cobb, California · 14954 days ago · 1 km deep · 3 km away
  18. 1.820 km ENE of Clearlake, California · 14953 days ago · 6 km deep · 41 km away
  19. 1.66 km W of Cobb, California · 14953 days ago · 3 km deep · 1 km away
  20. 1.55 km WSW of Cobb, California · 14953 days ago · 1 km deep · 3 km away
  21. 1.818 km E of Potter Valley, California · 14953 days ago · 6 km deep · 59 km away
  22. 1.66 km WSW of Cobb, California · 14953 days ago · 4 km deep · 3 km away
  23. 1.77 km WSW of Cobb, California · 14952 days ago · 1 km deep · 3 km away
  24. 1.76 km ENE of Willits, California · 14952 days ago · 4 km deep · 79 km away
  25. 1.78 km WSW of Cobb, California · 14952 days ago · 4 km deep · 4 km away
  26. 1.86 km W of Cobb, California · 14951 days ago · 0 km deep · 0 km away
  27. 2.06 km W of Cobb, California · 14951 days ago · 0 km deep · 0 km away
  28. 1.97 km WSW of Cobb, California · 14950 days ago · 4 km deep · 4 km away
  29. 2.38 km W of Cobb, California · 14950 days ago · 1 km deep · 3 km away
  30. 1.96 km W of Cobb, California · 14950 days ago · 1 km deep · 2 km away
  31. 2.27 km W of Cobb, California · 14949 days ago · 4 km deep · 2 km away
  32. 1.76 km W of Cobb, California · 14948 days ago · 2 km deep · 2 km away
  33. 1.67 km WSW of Cobb, California · 14948 days ago · 0 km deep · 3 km away
  34. 1.75 km SW of Cobb, California · 14948 days ago · 1 km deep · 5 km away
  35. 1.86 km WSW of Cobb, California · 14948 days ago · 3 km deep · 2 km away
  36. 1.75 km W of Cobb, California · 14947 days ago · 0 km deep · 1 km away
  37. 2.03 km SW of Cobb, California · 14947 days ago · 2 km deep · 6 km away
  38. 3.46 km W of Cobb, California · 14947 days ago · 3 km deep · 1 km away
  39. 1.94 km WSW of Cobb, California · 14947 days ago · 0 km deep · 3 km away
  40. 1.66 km SW of Cobb, California · 14947 days ago · 0 km deep · 5 km away
  41. 2.47 km W of Cobb, California · 14947 days ago · 1 km deep · 1 km away
  42. 1.97 km W of Cobb, California · 14947 days ago · 1 km deep · 1 km away
  43. 2.47 km W of Cobb, California · 14947 days ago · 1 km deep · 1 km away
  44. 1.66 km SW of Cobb, California · 14946 days ago · 0 km deep · 5 km away
  45. 2.48 km WSW of Cobb, California · 14946 days ago · 2 km deep · 3 km away
  46. 2.04 km WSW of Cobb, California · 14946 days ago · 1 km deep · 3 km away
  47. 1.810 km ESE of Boonville, California · 14946 days ago · 7 km deep · 43 km away
  48. 1.810 km ESE of Boonville, California · 14945 days ago · 6 km deep · 43 km away
  49. 1.99 km NE of Cloverdale, California · 14945 days ago · 4 km deep · 14 km away
  50. 2.15 km SW of Cobb, California · 14944 days ago · 0 km deep · 6 km away
  51. 1.85 km W of Cobb, California · 14944 days ago · 1 km deep · 2 km away
  52. 1.69 km SE of Hopland, California · 14943 days ago · 1 km deep · 23 km away
  53. 2.65 km E of Rohnert Park, California · 14943 days ago · 7 km deep · 55 km away
  54. 1.923 km WSW of Williams, California · 14943 days ago · 1 km deep · 44 km away
  55. 2.18 km W of Cobb, California · 14943 days ago · 1 km deep · 2 km away
  56. 1.68 km W of Cobb, California · 14943 days ago · 0 km deep · 3 km away
  57. 2.27 km W of Cobb, California · 14943 days ago · 3 km deep · 2 km away
  58. 2.25 km W of Cobb, California · 14942 days ago · 0 km deep · 1 km away
  59. 1.75 km WSW of Cobb, California · 14942 days ago · 0 km deep · 4 km away
  60. 1.910 km WSW of Cobb, California · 14942 days ago · 2 km deep · 6 km away

The first 60 of 174.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1131768. Read Tue, Sep 22, 2026, 4:04 PM UTC.