California earthquakes

M1.8 earthquake 6 km E of Williams, California

A magnitude 1.8 earthquake struck 6 km E of Williams, California on Sun, Sep 15, 1985, 6:28 PM PDT (01:28 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M4.1 5 km NW of Cobb, California. This one was a foreshock.

Williams 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), micro
Local time
UTC
1985-09-16 01:28:58 UTC
Depth
4.4 km (2.7 mi), shallow
Epicenter
39.161° N, 122.080° 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 6.1 km horizontally, 13.4 km in depth
Depth from
From location
Station coverage gap
254°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 175 in the 60 days after this one and 129 in the 30 days before it.

After

  1. 1.66 km W of Cobb, California · 14987 days ago · 3 km deep · 73 km away
  2. 3.67 km W of Cobb, California · 14987 days ago · 10 km deep · 74 km away
  3. 2.15 km SW of Cobb, California · 14987 days ago · -1 km deep · 73 km away
  4. 1.95 km SW of Cobb, California · 14987 days ago · 0 km deep · 73 km away
  5. 1.76 km W of Cobb, California · 14986 days ago · 2 km deep · 73 km away
  6. 1.95 km SW of Cobb, California · 14986 days ago · 0 km deep · 73 km away
  7. 1.910 km NNW of Moskowite Corner, California · 14986 days ago · 9 km deep · 71 km away
  8. 1.86 km WSW of Cobb, California · 14986 days ago · 4 km deep · 73 km away
  9. 1.65 km SW of Cobb, California · 14986 days ago · 0 km deep · 73 km away
  10. 2.55 km SW of Cobb, California · 14986 days ago · 1 km deep · 73 km away
  11. 2.55 km ENE of Williams, California · 14985 days ago · 10 km deep · 3 km away
  12. 2.09 km WNW of Arbuckle, California · 14985 days ago · 5 km deep · 12 km away
  13. 2.07 km ESE of Williams, California · 14985 days ago · 8 km deep · 4 km away
  14. 2.36 km ENE of Williams, California · 14985 days ago · 16 km deep · 1 km away
  15. 1.66 km SW of Cobb, California · 14985 days ago · 0 km deep · 73 km away
  16. 1.85 km E of Clearlake Oaks, California · 14984 days ago · -1 km deep · 48 km away
  17. 2.14 km SW of Cobb, California · 14984 days ago · -1 km deep · 71 km away
  18. 1.610 km NW of Cobb, California · 14983 days ago · 1 km deep · 71 km away
  19. 2.013 km SW of Durham, California · 14983 days ago · 18 km deep · 47 km away
  20. 1.86 km WSW of Cobb, California · 14983 days ago · 1 km deep · 74 km away
  21. 1.97 km W of Cobb, California · 14983 days ago · 0 km deep · 74 km away
  22. 2.16 km W of Cobb, California · 14983 days ago · 1 km deep · 72 km away
  23. 1.86 km SW of Hopland, California · 14983 days ago · 4 km deep · 98 km away
  24. 2.27 km W of Cobb, California · 14982 days ago · 3 km deep · 73 km away
  25. 2.127 km ESE of Covelo, California · 14982 days ago · 4 km deep · 96 km away
  26. 1.95 km SW of Cobb, California · 14982 days ago · 2 km deep · 73 km away
  27. 2.46 km W of Cobb, California · 14981 days ago · 1 km deep · 72 km away
  28. 1.99 km W of Cobb, California · 14980 days ago · 0 km deep · 76 km away
  29. 1.57 km WSW of Cobb, California · 14980 days ago · 0 km deep · 75 km away
  30. 1.63 km SW of Cobb, California · 14980 days ago · 1 km deep · 71 km away
  31. 1.57 km W of Cobb, California · 14980 days ago · 1 km deep · 73 km away
  32. 1.65 km WSW of Cobb, California · 14979 days ago · 1 km deep · 72 km away
  33. 1.85 km NNE of Windsor, California · 14979 days ago · 5 km deep · 88 km away
  34. 2.36 km NNE of Windsor, California · 14979 days ago · 1 km deep · 88 km away
  35. 2.510 km N of Cloverdale, California · 14979 days ago · -1 km deep · 85 km away
  36. 3.15 km WSW of Cobb, California · 14978 days ago · -1 km deep · 72 km away
  37. 1.95 km WSW of Cobb, California · 14978 days ago · 0 km deep · 73 km away
  38. 1.64 km S of Cobb, California · 14978 days ago · 2 km deep · 70 km away
  39. 2.010 km NW of Cohasset, California · 14978 days ago · 5 km deep · 95 km away
  40. 2.55 km SW of Cobb, California · 14978 days ago · 0 km deep · 73 km away
  41. 2.19 km ENE of Hopland, California · 14978 days ago · 23 km deep · 83 km away
  42. 2.05 km S of Moskowite Corner, California · 14978 days ago · 8 km deep · 85 km away
  43. 2.47 km W of Cobb, California · 14977 days ago · 3 km deep · 74 km away
  44. 1.75 km SW of Cobb, California · 14977 days ago · 1 km deep · 73 km away
  45. 1.97 km ENE of Clearlake, California · 14977 days ago · 3 km deep · 45 km away
  46. 1.77 km W of Cobb, California · 14977 days ago · 3 km deep · 74 km away
  47. 2.52 km E of Moskowite Corner, California · 14977 days ago · 4 km deep · 80 km away
  48. 2.312 km NE of Vina, California · 14977 days ago · 0 km deep · 94 km away
  49. 1.63 km NE of Santa Rosa, California · 14976 days ago · 2 km deep · 93 km away
  50. 2.28 km W of Cobb, California · 14976 days ago · 1 km deep · 75 km away
  51. 1.51 km ESE of Clear Lake Riviera, California · 14975 days ago · 1 km deep · 59 km away
  52. 1.64 km ESE of Moskowite Corner, California · 14975 days ago · 5 km deep · 82 km away
  53. 2.06 km W of Cobb, California · 14975 days ago · 2 km deep · 73 km away
  54. 1.76 km W of Cobb, California · 14975 days ago · 3 km deep · 72 km away
  55. 1.74 km S of Cobb, California · 14974 days ago · 2 km deep · 70 km away
  56. 1.64 km S of Cobb, California · 14974 days ago · 2 km deep · 70 km away
  57. 1.65 km SW of Cobb, California · 14973 days ago · 1 km deep · 73 km away
  58. 2.019 km N of Upper Lake, California · 14973 days ago · 5 km deep · 71 km away
  59. 1.89 km W of Cobb, California · 14972 days ago · 0 km deep · 75 km away
  60. 1.74 km WSW of Cobb, California · 14971 days ago · 1 km deep · 72 km away

The first 60 of 175.

Before

  1. 2.05 km NE of Williams, California · 14987 days ago · 18 km deep · 3 km away
  2. 1.78 km WNW of Cobb, California · 14987 days ago · -1 km deep · 71 km away
  3. 1.66 km WNW of Cobb, California · 14987 days ago · 1 km deep · 72 km away
  4. 1.86 km W of Cobb, California · 14987 days ago · 3 km deep · 73 km away
  5. 2.36 km W of Cobb, California · 14988 days ago · 3 km deep · 73 km away
  6. 1.94 km WSW of Cobb, California · 14988 days ago · 1 km deep · 72 km away
  7. 1.612 km NE of Upper Lake, California · 14988 days ago · 4 km deep · 64 km away
  8. 1.85 km W of Cobb, California · 14988 days ago · 0 km deep · 73 km away
  9. 1.812 km NE of Upper Lake, California · 14989 days ago · 2 km deep · 62 km away
  10. 1.65 km W of Cobb, California · 14989 days ago · 1 km deep · 72 km away
  11. 2.44 km E of Williams, California · 14989 days ago · 16 km deep · 2 km away
  12. 1.68 km W of Cobb, California · 14989 days ago · 1 km deep · 74 km away
  13. 1.64 km W of Cobb, California · 14989 days ago · 0 km deep · 71 km away
  14. 2.512 km NE of Upper Lake, California · 14989 days ago · 3 km deep · 62 km away
  15. 1.66 km W of Cobb, California · 14989 days ago · 0 km deep · 72 km away
  16. 2.2Northern California · 14990 days ago · 2 km deep · 62 km away
  17. 2.16 km NE of Windsor, California · 14990 days ago · 5 km deep · 87 km away
  18. 1.93 km WSW of Glen Ellen, California · 14990 days ago · 8 km deep · 99 km away
  19. 2.13 km W of Glen Ellen, California · 14990 days ago · 8 km deep · 99 km away
  20. 1.812 km NE of Upper Lake, California · 14990 days ago · 2 km deep · 63 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc56142. Read Sun, Sep 27, 2026, 10:07 PM UTC.