California earthquakes

M1.9 earthquake 12 km NW of Upper Lake, California

A magnitude 1.9 earthquake struck 12 km NW of Upper Lake, California on Sat, Mar 23, 1985, 4:40 AM PST (12:40 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.7 10 km WSW of Meridian, California. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1985-03-23 12:40:21 UTC
Depth
4.6 km (2.9 mi), shallow
Epicenter
39.241° N, 123.014° 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 0.2 km horizontally, 1.2 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
96°
Stations used
21

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 137 in the 30 days before it.

After

  1. 3.27 km NNE of Hopland, California · 15167 days ago · 2 km deep · 23 km away
  2. 1.96 km W of Cobb, California · 15167 days ago · 3 km deep · 50 km away
  3. 2.09 km NNE of Angwin, California · 15166 days ago · -1 km deep · 85 km away
  4. 2.06 km SW of Cobb, California · 15166 days ago · 1 km deep · 56 km away
  5. 1.55 km SSW of Cobb, California · 15166 days ago · 1 km deep · 56 km away
  6. 2.36 km WSW of Cobb, California · 15165 days ago · -1 km deep · 53 km away
  7. 1.86 km WSW of Cobb, California · 15165 days ago · 0 km deep · 54 km away
  8. 1.87 km WSW of Cobb, California · 15165 days ago · 1 km deep · 52 km away
  9. 2.14 km WSW of Cobb, California · 15165 days ago · 2 km deep · 52 km away
  10. 1.65 km SW of Cobb, California · 15165 days ago · 1 km deep · 54 km away
  11. 1.96 km WSW of Cobb, California · 15163 days ago · 4 km deep · 51 km away
  12. 1.621 km S of Ruth, California · 15162 days ago · 6 km deep · 96 km away
  13. 2.322 km S of Ruth, California · 15162 days ago · 8 km deep · 95 km away
  14. 1.66 km W of Cobb, California · 15162 days ago · 3 km deep · 51 km away
  15. 1.817 km ESE of Hidden Valley Lake, California · 15162 days ago · 4 km deep · 78 km away
  16. 2.97 km W of Cobb, California · 15162 days ago · 1 km deep · 51 km away
  17. 1.6Northern California · 15162 days ago · 1 km deep · 51 km away
  18. 1.88 km W of Cobb, California · 15162 days ago · 0 km deep · 50 km away
  19. 2.25 km E of Santa Rosa, California · 15162 days ago · 0 km deep · 95 km away
  20. 1.67 km WSW of Cobb, California · 15161 days ago · 0 km deep · 52 km away
  21. 1.919 km WSW of Williams, California · 15161 days ago · 1 km deep · 57 km away
  22. 1.67 km WSW of Cobb, California · 15161 days ago · 1 km deep · 52 km away
  23. 1.64 km NNE of Clearlake, California · 15161 days ago · 0 km deep · 45 km away
  24. 1.97 km W of Cobb, California · 15161 days ago · 3 km deep · 51 km away
  25. 2.313 km SSW of Guinda, California · 15160 days ago · 0 km deep · 86 km away
  26. 1.62 km SSE of Clear Lake Riviera, California · 15160 days ago · 3 km deep · 44 km away
  27. 2.420 km WSW of Williams, California · 15160 days ago · 0 km deep · 57 km away
  28. 3.37 km W of Cobb, California · 15159 days ago · 4 km deep · 50 km away
  29. 1.818 km W of Williams, California · 15159 days ago · 4 km deep · 57 km away
  30. 1.77 km WSW of Cobb, California · 15159 days ago · 1 km deep · 52 km away
  31. 1.67 km W of Cobb, California · 15159 days ago · 3 km deep · 51 km away
  32. 1.65 km SW of Cobb, California · 15159 days ago · 0 km deep · 55 km away
  33. 1.62 km SW of Cobb, California · 15159 days ago · -1 km deep · 54 km away
  34. 1.75 km W of Cobb, California · 15159 days ago · 0 km deep · 50 km away
  35. 1.67 km W of Cobb, California · 15159 days ago · 3 km deep · 50 km away
  36. 1.78 km W of Cobb, California · 15159 days ago · 1 km deep · 49 km away
  37. 1.6Northern California · 15159 days ago · 9 km deep · 99 km away
  38. 2.56 km E of Santa Rosa, California · 15158 days ago · 1 km deep · 96 km away
  39. 1.66 km WSW of Cobb, California · 15158 days ago · 3 km deep · 52 km away
  40. 3.220 km WSW of Williams, California · 15158 days ago · 5 km deep · 57 km away
  41. 1.719 km WSW of Williams, California · 15158 days ago · 2 km deep · 57 km away
  42. 2.420 km WSW of Williams, California · 15158 days ago · 1 km deep · 57 km away
  43. 1.617 km W of Williams, California · 15158 days ago · 3 km deep · 58 km away
  44. 1.56 km ESE of Hopland, California · 15158 days ago · 1 km deep · 33 km away
  45. 1.96 km WNW of Covelo, California · 15157 days ago · 6 km deep · 68 km away
  46. 2.220 km WSW of Williams, California · 15157 days ago · 6 km deep · 56 km away
  47. 2.520 km WSW of Williams, California · 15157 days ago · 5 km deep · 57 km away
  48. 1.57 km WSW of Cobb, California · 15157 days ago · 5 km deep · 53 km away
  49. 1.64 km W of Cobb, California · 15157 days ago · -1 km deep · 50 km away
  50. 2.417 km WSW of Williams, California · 15157 days ago · 5 km deep · 59 km away
  51. 3.15 km WSW of Cobb, California · 15156 days ago · 0 km deep · 53 km away
  52. 1.95 km W of Cobb, California · 15156 days ago · 0 km deep · 50 km away
  53. 1.95 km SW of Cobb, California · 15155 days ago · 0 km deep · 54 km away
  54. 2.219 km WSW of Williams, California · 15155 days ago · 4 km deep · 57 km away
  55. 2.120 km WSW of Williams, California · 15155 days ago · 2 km deep · 57 km away
  56. 2.18 km WSW of Cobb, California · 15155 days ago · 3 km deep · 53 km away
  57. 1.76 km W of Cobb, California · 15155 days ago · 3 km deep · 50 km away
  58. 1.97 km WSW of Cobb, California · 15154 days ago · 1 km deep · 53 km away
  59. 1.94 km N of Larkfield-Wikiup, California · 15154 days ago · 3 km deep · 80 km away
  60. 2.67 km WSW of Cobb, California · 15154 days ago · 0 km deep · 52 km away

The first 60 of 180.

Before

  1. 2.35 km SW of Cobb, California · 15167 days ago · 1 km deep · 55 km away
  2. 3.15 km WSW of Laytonville, California · 15167 days ago · 2 km deep · 65 km away
  3. 1.68 km W of Cobb, California · 15168 days ago · 0 km deep · 49 km away
  4. 1.924 km W of Paskenta, California · 15168 days ago · -1 km deep · 78 km away
  5. 3.04 km W of Cobb, California · 15168 days ago · -1 km deep · 50 km away
  6. 2.27 km WSW of Cobb, California · 15168 days ago · 2 km deep · 52 km away
  7. 1.819 km NNE of Upper Lake, California · 15168 days ago · 0 km deep · 19 km away
  8. 1.87 km WSW of Cobb, California · 15168 days ago · 1 km deep · 52 km away
  9. 1.54 km N of Laytonville, California · 15169 days ago · 11 km deep · 68 km away
  10. 1.65 km W of Cobb, California · 15169 days ago · -1 km deep · 51 km away
  11. 1.85 km SW of Cobb, California · 15169 days ago · 4 km deep · 54 km away
  12. 2.09 km W of Cobb, California · 15169 days ago · 2 km deep · 50 km away
  13. 2.75 km W of Cobb, California · 15169 days ago · 3 km deep · 51 km away
  14. 2.05 km WSW of Cobb, California · 15169 days ago · 0 km deep · 53 km away
  15. 1.97 km W of Cobb, California · 15170 days ago · 1 km deep · 51 km away
  16. 1.85 km SW of Cobb, California · 15170 days ago · 1 km deep · 54 km away
  17. 1.76 km W of Cobb, California · 15170 days ago · 3 km deep · 50 km away
  18. 1.61 km ENE of Larkfield-Wikiup, California · 15170 days ago · 3 km deep · 84 km away
  19. 2.43 km NNE of Guinda, California · 15170 days ago · -1 km deep · 83 km away
  20. 2.86 km NW of Guinda, California · 15171 days ago · 0 km deep · 78 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc45217. Read Thu, Oct 1, 2026, 9:48 AM UTC.