California earthquakes

M2.3 earthquake 22 km WSW of Williams, California

A magnitude 2.3 earthquake struck 22 km WSW of Williams, California on Sat, Apr 20, 1985, 12:30 PM PST (20:30 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.8 6 km WSW 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
2.3 (md), micro
Local time
UTC
1985-04-20 20:30:25 UTC
Depth
3.4 km (2.1 mi), shallow
Epicenter
39.090° N, 122.394° 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, 1.0 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
187°, poorly surrounded by stations
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: 187 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.54 km S of Cobb, California · 15114 days ago · 2 km deep · 45 km away
  2. 1.88 km W of Cobb, California · 15113 days ago · 1 km deep · 48 km away
  3. 1.68 km W of Cobb, California · 15113 days ago · 1 km deep · 48 km away
  4. 1.86 km W of Cobb, California · 15112 days ago · 0 km deep · 46 km away
  5. 2.36 km W of Cobb, California · 15112 days ago · 0 km deep · 46 km away
  6. 1.56 km W of Cobb, California · 15112 days ago · 0 km deep · 46 km away
  7. 1.69 km WSW of Cobb, California · 15111 days ago · 2 km deep · 49 km away
  8. 1.57 km WSW of Cobb, California · 15111 days ago · 2 km deep · 48 km away
  9. 1.55 km SW of Cobb, California · 15110 days ago · 0 km deep · 47 km away
  10. 2.36 km W of Cobb, California · 15110 days ago · 2 km deep · 47 km away
  11. 2.27 km W of Cobb, California · 15110 days ago · 2 km deep · 48 km away
  12. 2.14 km WSW of Cobb, California · 15110 days ago · 1 km deep · 46 km away
  13. 2.86 km WSW of Cobb, California · 15109 days ago · 0 km deep · 47 km away
  14. 2.27 km WSW of Cobb, California · 15109 days ago · 1 km deep · 48 km away
  15. 2.16 km W of Cobb, California · 15109 days ago · 3 km deep · 46 km away
  16. 1.86 km W of Cobb, California · 15108 days ago · 3 km deep · 46 km away
  17. 1.97 km W of Cobb, California · 15108 days ago · 1 km deep · 47 km away
  18. 2.15 km ENE of Calpella, California · 15107 days ago · 6 km deep · 67 km away
  19. 2.13 km SW of Cobb, California · 15107 days ago · 1 km deep · 45 km away
  20. 1.619 km E of Potter Valley, California · 15107 days ago · 5 km deep · 52 km away
  21. 2.17 km WSW of Cobb, California · 15107 days ago · 1 km deep · 48 km away
  22. 1.94 km ENE of Calpella, California · 15107 days ago · 0 km deep · 68 km away
  23. 2.67 km W of Cobb, California · 15106 days ago · 3 km deep · 47 km away
  24. 1.68 km WSW of Cobb, California · 15106 days ago · 3 km deep · 49 km away
  25. 1.617 km NE of Upper Lake, California · 15106 days ago · 4 km deep · 40 km away
  26. 1.67 km W of Cobb, California · 15106 days ago · 0 km deep · 46 km away
  27. 1.95 km SW of Cobb, California · 15106 days ago · 1 km deep · 46 km away
  28. 2.07 km WSW of Cobb, California · 15105 days ago · 2 km deep · 48 km away
  29. 1.56 km NW of Cobb, California · 15105 days ago · 1 km deep · 41 km away
  30. 2.46 km W of Cobb, California · 15105 days ago · 3 km deep · 46 km away
  31. 1.76 km W of Cobb, California · 15105 days ago · 3 km deep · 46 km away
  32. 1.59 km W of Cobb, California · 15105 days ago · 1 km deep · 49 km away
  33. 2.48 km WSW of Cobb, California · 15104 days ago · 3 km deep · 48 km away
  34. 1.87 km WSW of Cobb, California · 15104 days ago · 3 km deep · 48 km away
  35. 2.37 km WSW of Cobb, California · 15104 days ago · 4 km deep · 48 km away
  36. 1.820 km ENE of Clearlake, California · 15104 days ago · 6 km deep · 6 km away
  37. 1.67 km WSW of Cobb, California · 15104 days ago · 1 km deep · 48 km away
  38. 2.14 km ENE of Hopland, California · 15104 days ago · 3 km deep · 60 km away
  39. 2.08 km WSW of Cobb, California · 15104 days ago · 3 km deep · 49 km away
  40. 1.612 km WSW of Williams, CA · 15103 days ago · 7 km deep · 10 km away
  41. 1.710 km WSW of Cobb, California · 15102 days ago · 1 km deep · 50 km away
  42. 2.88 km WSW of Meridian, California · 15102 days ago · 0 km deep · 34 km away
  43. 1.514 km S of Hamilton City, California · 15102 days ago · 5 km deep · 67 km away
  44. 1.71 km ESE of Angwin, California · 15102 days ago · 8 km deep · 58 km away
  45. 2.35 km W of Cobb, California · 15101 days ago · 0 km deep · 46 km away
  46. 1.95 km W of Cobb, California · 15101 days ago · 0 km deep · 45 km away
  47. 1.95 km W of Cobb, California · 15101 days ago · 0 km deep · 45 km away
  48. 2.35 km W of Meridian, California · 15101 days ago · 9 km deep · 36 km away
  49. 2.66 km SSW of Colusa, California · 15100 days ago · 21 km deep · 31 km away
  50. 1.52 km N of Healdsburg, California · 15100 days ago · 4 km deep · 66 km away
  51. 1.57 km W of Cobb, California · 15100 days ago · 4 km deep · 47 km away
  52. 1.66 km W of Cobb, California · 15100 days ago · 2 km deep · 47 km away
  53. 1.72 km NW of Healdsburg, California · 15100 days ago · 7 km deep · 67 km away
  54. 3.28 km SSW of Colusa, California · 15100 days ago · 20 km deep · 32 km away
  55. 2.710 km WSW of Meridian, California · 15100 days ago · 8 km deep · 32 km away
  56. 2.56 km SSW of Colusa, California · 15100 days ago · 12 km deep · 31 km away
  57. 3.37 km SSW of Colusa, California · 15100 days ago · 21 km deep · 32 km away
  58. 2.26 km S of Colusa, California · 15100 days ago · 13 km deep · 33 km away
  59. 2.37 km WSW of Cobb, California · 15100 days ago · 4 km deep · 48 km away
  60. 1.69 km NE of Hopland, California · 15100 days ago · 6 km deep · 57 km away

The first 60 of 187.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc46492. Read Tue, Sep 22, 2026, 8:46 PM UTC.