California earthquakes

M2.1 earthquake 13 km N of Upper Lake, California

A magnitude 2.1 earthquake struck 13 km N of Upper Lake, California on Wed, Feb 20, 1985, 9:17 AM PST (17:17 UTC), 12 km (8 mi) below the surface.

A larger quake followed: M2.5 6 km W of Cobb, 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
2.1 (md), micro
Local time
UTC
1985-02-20 17:17:22 UTC
Depth
12.3 km (7.6 mi), shallow
Epicenter
39.283° N, 122.930° 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 0.8 km horizontally, 2.8 km in depth
Magnitude uncertainty
±0.40
Depth from
From location
Station coverage gap
173°
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: 185 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.617 km WNW of Brooktrails, California · 15174 days ago · 1 km deep · 60 km away
  2. 2.08 km E of Hidden Valley Lake, California · 15174 days ago · 2 km deep · 67 km away
  3. 2.17 km WSW of Cobb, California · 15174 days ago · 0 km deep · 54 km away
  4. 2.56 km W of Cobb, California · 15174 days ago · 3 km deep · 52 km away
  5. 1.96 km SW of Cobb, California · 15174 days ago · 1 km deep · 57 km away
  6. 1.65 km WSW of Cobb, California · 15173 days ago · 0 km deep · 56 km away
  7. 2.05 km W of Cobb, California · 15173 days ago · 1 km deep · 52 km away
  8. 1.55 km W of Cobb, California · 15173 days ago · 0 km deep · 52 km away
  9. 2.37 km W of Cobb, California · 15172 days ago · 0 km deep · 52 km away
  10. 1.911 km NNE of Comptche, California · 15171 days ago · 2 km deep · 54 km away
  11. 1.92 km SSE of Clear Lake Riviera, California · 15171 days ago · 1 km deep · 43 km away
  12. 2.02 km SSE of Clear Lake Riviera, California · 15171 days ago · 0 km deep · 43 km away
  13. 1.63 km E of Clear Lake Riviera, California · 15171 days ago · 0 km deep · 43 km away
  14. 1.711 km SE of Hopland, California · 15170 days ago · 2 km deep · 42 km away
  15. 1.57 km W of Cobb, California · 15170 days ago · 0 km deep · 53 km away
  16. 2.57 km W of Cobb, California · 15169 days ago · 2 km deep · 53 km away
  17. 1.74 km W of Cobb, California · 15169 days ago · 0 km deep · 54 km away
  18. 1.59 km WSW of Cobb, California · 15169 days ago · 1 km deep · 54 km away
  19. 2.010 km SSE of Leggett, California · 15168 days ago · 6 km deep · 83 km away
  20. 1.84 km ESE of Healdsburg, California · 15168 days ago · 6 km deep · 77 km away
  21. 2.05 km SW of Cobb, California · 15167 days ago · 0 km deep · 56 km away
  22. 1.56 km W of Cobb, California · 15166 days ago · 4 km deep · 53 km away
  23. 1.86 km WSW of Clear Lake Riviera, California · 15166 days ago · 6 km deep · 42 km away
  24. 1.98 km WSW of Cobb, California · 15166 days ago · 3 km deep · 55 km away
  25. 4.111 km NNE of Cloverdale, California · 15166 days ago · 13 km deep · 44 km away
  26. 3.020 km NNE of Upper Lake, California · 15165 days ago · 10 km deep · 12 km away
  27. 2.56 km W of Cobb, California · 15164 days ago · 1 km deep · 51 km away
  28. 1.87 km W of Cobb, California · 15164 days ago · 2 km deep · 52 km away
  29. 1.97 km WSW of Cobb, California · 15164 days ago · 1 km deep · 55 km away
  30. 2.48 km WSW of Cobb, California · 15164 days ago · 4 km deep · 55 km away
  31. 1.55 km SW of Cobb, California · 15164 days ago · 0 km deep · 58 km away
  32. 2.07 km WSW of Cobb, California · 15164 days ago · 0 km deep · 54 km away
  33. 1.56 km W of Cobb, California · 15163 days ago · 1 km deep · 54 km away
  34. 2.06 km W of Cobb, California · 15163 days ago · 2 km deep · 53 km away
  35. 1.7Northern California · 15163 days ago · 0 km deep · 54 km away
  36. 1.74 km W of Cobb, California · 15162 days ago · 0 km deep · 53 km away
  37. 2.86 km NW of Guinda, California · 15162 days ago · 0 km deep · 74 km away
  38. 2.43 km NNE of Guinda, California · 15162 days ago · -1 km deep · 80 km away
  39. 1.61 km ENE of Larkfield-Wikiup, California · 15162 days ago · 3 km deep · 87 km away
  40. 1.76 km W of Cobb, California · 15162 days ago · 3 km deep · 53 km away
  41. 1.85 km SW of Cobb, California · 15162 days ago · 1 km deep · 56 km away
  42. 1.97 km W of Cobb, California · 15161 days ago · 1 km deep · 54 km away
  43. 2.05 km WSW of Cobb, California · 15161 days ago · 0 km deep · 55 km away
  44. 2.75 km W of Cobb, California · 15161 days ago · 3 km deep · 53 km away
  45. 2.09 km W of Cobb, California · 15161 days ago · 2 km deep · 53 km away
  46. 1.85 km SW of Cobb, California · 15160 days ago · 4 km deep · 56 km away
  47. 1.65 km W of Cobb, California · 15160 days ago · -1 km deep · 53 km away
  48. 1.54 km N of Laytonville, California · 15160 days ago · 11 km deep · 69 km away
  49. 1.87 km WSW of Cobb, California · 15160 days ago · 1 km deep · 54 km away
  50. 1.819 km NNE of Upper Lake, California · 15160 days ago · 0 km deep · 11 km away
  51. 2.27 km WSW of Cobb, California · 15159 days ago · 2 km deep · 55 km away
  52. 3.04 km W of Cobb, California · 15159 days ago · -1 km deep · 53 km away
  53. 1.924 km W of Paskenta, California · 15159 days ago · -1 km deep · 72 km away
  54. 1.68 km W of Cobb, California · 15159 days ago · 0 km deep · 52 km away
  55. 3.15 km WSW of Laytonville, California · 15159 days ago · 2 km deep · 67 km away
  56. 2.35 km SW of Cobb, California · 15159 days ago · 1 km deep · 57 km away
  57. 1.912 km NW of Upper Lake, California · 15158 days ago · 5 km deep · 9 km away
  58. 3.27 km NNE of Hopland, California · 15158 days ago · 2 km deep · 30 km away
  59. 1.96 km W of Cobb, California · 15158 days ago · 3 km deep · 53 km away
  60. 2.09 km NNE of Angwin, California · 15158 days ago · -1 km deep · 84 km away

The first 60 of 185.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1126037. Read Tue, Sep 22, 2026, 10:26 PM UTC.