California earthquakes

M3.3 earthquake 7 km SSW of Colusa, California

A magnitude 3.3 earthquake struck 7 km SSW of Colusa, California on Mon, May 20, 1985, 6:50 PM PDT (01:50 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M3.6 9 km ESE of Williams, California. This one was a foreshock.

Colusa 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
3.3 (md), minor
Local time
UTC
1985-05-21 01:50:57 UTC
Depth
21.3 km (13.2 mi), shallow
Epicenter
39.155° N, 122.038° 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 0.4 km horizontally, 0.9 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
86°
Stations used
41

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 180 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.71 km NNE of Talmage, California · 15091 days ago · 4 km deep · 97 km away
  2. 1.85 km W of Cobb, California · 15091 days ago · 1 km deep · 75 km away
  3. 2.17 km W of Cobb, California · 15090 days ago · 3 km deep · 77 km away
  4. 2.19 km WSW of Meridian, California · 15090 days ago · 5 km deep · 7 km away
  5. 2.510 km ESE of Williams, California · 15090 days ago · 18 km deep · 5 km away
  6. 2.6Northern California · 15090 days ago · 1 km deep · 78 km away
  7. 2.16 km E of Williams, California · 15090 days ago · 22 km deep · 3 km away
  8. 2.810 km NNE of Arbuckle, California · 15089 days ago · 9 km deep · 6 km away
  9. 3.69 km ESE of Williams, California · 15089 days ago · 13 km deep · 5 km away
  10. 2.39 km SSW of Colusa, California · 15089 days ago · 16 km deep · 3 km away
  11. 1.86 km SSW of Colusa, California · 15089 days ago · 5 km deep · 1 km away
  12. 3.5Northern California · 15089 days ago · 23 km deep · 4 km away
  13. 1.84 km SSW of Dunnigan, California · 15089 days ago · 5 km deep · 34 km away
  14. 2.28 km NNE of Arbuckle, California · 15089 days ago · 4 km deep · 8 km away
  15. 1.96 km W of Meridian, California · 15089 days ago · 5 km deep · 4 km away
  16. 1.67 km SSW of Colusa, California · 15088 days ago · 5 km deep · 1 km away
  17. 1.88 km W of Cobb, California · 15088 days ago · 1 km deep · 77 km away
  18. 2.48 km W of Cobb, California · 15088 days ago · 1 km deep · 77 km away
  19. 2.610 km WSW of Cobb, California · 15088 days ago · 2 km deep · 79 km away
  20. 1.77 km NE of Clearlake, California · 15088 days ago · 1 km deep · 48 km away
  21. 1.87 km W of Cobb, California · 15087 days ago · 0 km deep · 77 km away
  22. 1.65 km W of Lower Lake, California · 15087 days ago · 4 km deep · 62 km away
  23. 1.86 km W of Lower Lake, California · 15087 days ago · 4 km deep · 62 km away
  24. 1.65km WNW of Lakeport, CA · 15087 days ago · 24 km deep · 81 km away
  25. 1.78 km W of Cobb, California · 15087 days ago · 0 km deep · 77 km away
  26. 2.07 km WNW of Arbuckle, California · 15087 days ago · 4 km deep · 16 km away
  27. 2.210 km NNE of Hopland, California · 15086 days ago · 5 km deep · 89 km away
  28. 2.010 km NNE of Hopland, California · 15086 days ago · 5 km deep · 90 km away
  29. 2.44 km S of Oroville East, California · 15086 days ago · 2 km deep · 59 km away
  30. 2.27 km W of Cobb, California · 15086 days ago · 0 km deep · 77 km away
  31. 1.66 km W of Cobb, California · 15085 days ago · 4 km deep · 75 km away
  32. 1.722 km NE of Potter Valley, California · 15085 days ago · 7 km deep · 84 km away
  33. 1.65 km SW of Cobb, California · 15085 days ago · 1 km deep · 75 km away
  34. 1.89 km S of Hopland, California · 15085 days ago · 5 km deep · 100 km away
  35. 2.24 km SW of Cobb, California · 15085 days ago · 1 km deep · 74 km away
  36. 2.38 km E of Williams, California · 15084 days ago · 17 km deep · 2 km away
  37. 1.66 km WSW of Cobb, California · 15084 days ago · 1 km deep · 76 km away
  38. 2.014 km N of Upper Lake, California · 15084 days ago · -1 km deep · 78 km away
  39. 1.76 km W of Cobb, California · 15084 days ago · 3 km deep · 76 km away
  40. 1.75 km WSW of Cobb, California · 15084 days ago · 0 km deep · 76 km away
  41. 1.68 km WSW of Cobb, California · 15083 days ago · 3 km deep · 78 km away
  42. 2.07 km NNE of Arbuckle, California · 15083 days ago · 8 km deep · 8 km away
  43. 1.65 km NE of College City, California · 15083 days ago · 4 km deep · 14 km away
  44. 1.79 km NW of Cobb, California · 15083 days ago · 1 km deep · 73 km away
  45. 2.09 km ESE of Williams, California · 15082 days ago · 5 km deep · 3 km away
  46. 2.26 km W of Cobb, California · 15082 days ago · 2 km deep · 76 km away
  47. 1.66 km W of Cobb, California · 15082 days ago · 2 km deep · 76 km away
  48. 1.66 km W of Cobb, California · 15082 days ago · 0 km deep · 76 km away
  49. 1.98 km W of Cobb, California · 15082 days ago · 0 km deep · 77 km away
  50. 1.910 km N of Arbuckle, California · 15081 days ago · 7 km deep · 5 km away
  51. 1.56 km W of Cobb, California · 15081 days ago · 3 km deep · 76 km away
  52. 1.85 km SW of Cobb, California · 15080 days ago · 0 km deep · 75 km away
  53. 1.75 km SW of Cobb, California · 15079 days ago · 1 km deep · 76 km away
  54. 1.67 km WSW of Cobb, California · 15079 days ago · 1 km deep · 77 km away
  55. 1.65 km W of Cobb, California · 15078 days ago · 1 km deep · 74 km away
  56. 1.66 km W of Cobb, California · 15078 days ago · 2 km deep · 76 km away
  57. 1.67 km NNE of Hopland, California · 15078 days ago · 0 km deep · 91 km away
  58. 2.3Northern California · 15077 days ago · 5 km deep · 98 km away
  59. 2.310 km NE of Vina, California · 15077 days ago · -1 km deep · 94 km away
  60. 3.16 km W of Cobb, California · 15077 days ago · 1 km deep · 76 km away

The first 60 of 180.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc48159 (also filed as usp0002f19). Read Tue, Sep 22, 2026, 9:43 PM UTC.