California earthquakes

M1.9 earthquake 18 km NE of Upper Lake, California

A magnitude 1.9 earthquake struck 18 km NE of Upper Lake, California on Mon, Apr 15, 1985, 6:36 PM PST (02:36 UTC), 7 km (4 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), micro
Local time
UTC
1985-04-16 02:36:24 UTC
Depth
7.2 km (4.5 mi), shallow
Epicenter
39.295° N, 122.779° 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 1.3 km horizontally, 4.2 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
225°, poorly surrounded by stations
Stations used
4

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 136 in the 30 days before it.

After

  1. 2.38 km WSW of Cobb, California · 15142 days ago · 3 km deep · 55 km away
  2. 1.710 km SSE of Laytonville, California · 15141 days ago · 7 km deep · 65 km away
  3. 2.0Northern California · 15141 days ago · 1 km deep · 53 km away
  4. 2.17 km NNW of Richvale, California · 15141 days ago · 5 km deep · 90 km away
  5. 2.07 km W of Cobb, California · 15140 days ago · 1 km deep · 52 km away
  6. 2.221 km WSW of Williams, California · 15140 days ago · 0 km deep · 40 km away
  7. 3.710 km WSW of Meridian, California · 15140 days ago · 18 km deep · 67 km away
  8. 2.29 km WSW of Meridian, California · 15140 days ago · 12 km deep · 68 km away
  9. 1.67 km WSW of Cobb, California · 15139 days ago · 0 km deep · 55 km away
  10. 1.611 km W of Cobb, California · 15139 days ago · -1 km deep · 54 km away
  11. 1.77 km W of Cobb, California · 15139 days ago · 0 km deep · 53 km away
  12. 2.57 km W of Cobb, California · 15139 days ago · 1 km deep · 53 km away
  13. 2.57 km W of Cobb, California · 15139 days ago · 1 km deep · 53 km away
  14. 1.67 km W of Cobb, California · 15139 days ago · 1 km deep · 52 km away
  15. 2.57 km W of Cobb, California · 15139 days ago · 1 km deep · 53 km away
  16. 2.014 km N of Upper Lake, California · 15139 days ago · 5 km deep · 12 km away
  17. 1.612 km NNE of Laytonville, California · 15138 days ago · 6 km deep · 77 km away
  18. 2.88 km NNE of Arbuckle, California · 15138 days ago · 3 km deep · 70 km away
  19. 1.710 km ESE of Covelo, California · 15138 days ago · 1 km deep · 60 km away
  20. 2.322 km WSW of Williams, California · 15138 days ago · 3 km deep · 40 km away
  21. 1.57 km W of Cobb, California · 15137 days ago · 1 km deep · 52 km away
  22. 1.66 km W of Cobb, California · 15137 days ago · 3 km deep · 53 km away
  23. 1.68 km WSW of Cobb, California · 15137 days ago · 3 km deep · 55 km away
  24. 2.58 km WSW of Meridian, California · 15137 days ago · 12 km deep · 69 km away
  25. 1.64 km SW of Hopland, California · 15137 days ago · 5 km deep · 50 km away
  26. 2.513 km NNE of Laytonville, California · 15137 days ago · 10 km deep · 78 km away
  27. 2.37 km WSW of Cobb, California · 15135 days ago · 4 km deep · 55 km away
  28. 1.66 km W of Cobb, California · 15135 days ago · 1 km deep · 53 km away
  29. 1.78 km WSW of Cobb, California · 15135 days ago · 3 km deep · 55 km away
  30. 1.85 km NNW of Geyserville, California · 15134 days ago · 5 km deep · 62 km away
  31. 1.813 km SE of Laytonville, California · 15133 days ago · 10 km deep · 61 km away
  32. 1.97 km WSW of Cobb, California · 15133 days ago · 2 km deep · 55 km away
  33. 1.97 km WSW of Cobb, California · 15132 days ago · 1 km deep · 54 km away
  34. 2.16 km W of Cobb, California · 15131 days ago · 3 km deep · 53 km away
  35. 2.06 km W of Cobb, California · 15131 days ago · 3 km deep · 53 km away
  36. 2.28 km WSW of Cobb, California · 15131 days ago · 3 km deep · 55 km away
  37. 1.76 km NE of Brooktrails, California · 15131 days ago · 6 km deep · 52 km away
  38. 1.7Northern California · 15130 days ago · 2 km deep · 55 km away
  39. 2.1Northern California · 15130 days ago · 2 km deep · 83 km away
  40. 2.74 km W of Cobb, California · 15129 days ago · 0 km deep · 52 km away
  41. 1.66 km W of Cobb, California · 15129 days ago · -1 km deep · 52 km away
  42. 1.66 km W of Cobb, California · 15129 days ago · -1 km deep · 52 km away
  43. 1.69 km W of Cobb, California · 15129 days ago · 1 km deep · 54 km away
  44. 1.59 km W of Cobb, California · 15129 days ago · 1 km deep · 54 km away
  45. 1.77 km WSW of Cobb, California · 15129 days ago · 1 km deep · 55 km away
  46. 2.45 km SW of Cobb, California · 15129 days ago · 0 km deep · 56 km away
  47. 2.06 km WNW of Guinda, California · 15129 days ago · 3 km deep · 66 km away
  48. 1.85 km SW of Cobb, California · 15129 days ago · 2 km deep · 56 km away
  49. 1.77 km WSW of Cobb, California · 15128 days ago · 1 km deep · 55 km away
  50. 2.55 km WSW of Cobb, California · 15128 days ago · 3 km deep · 56 km away
  51. 2.57 km SW of Meridian, California · 15128 days ago · 10 km deep · 71 km away
  52. 2.16 km W of Cobb, California · 15127 days ago · 3 km deep · 53 km away
  53. 1.77 km W of Cobb, California · 15127 days ago · 1 km deep · 54 km away
  54. 1.85 km ESE of Willits, California · 15127 days ago · 0 km deep · 45 km away
  55. 2.321 km WSW of Williams, California · 15127 days ago · 0 km deep · 40 km away
  56. 1.85 km W of Angwin, California · 15125 days ago · 8 km deep · 83 km away
  57. 1.86 km W of Cobb, California · 15124 days ago · -1 km deep · 52 km away
  58. 2.15 km SSW of Cobb, California · 15124 days ago · 1 km deep · 57 km away
  59. 1.712 km WNW of Cobb, California · 15124 days ago · 1 km deep · 49 km away
  60. 2.231 km WSW of Paskenta, California · 15123 days ago · 9 km deep · 53 km away

The first 60 of 180.

Before

  1. 2.28 km WSW of Cobb, California · 15143 days ago · 0 km deep · 55 km away
  2. 2.47 km WNW of Guinda, California · 15143 days ago · 1 km deep · 65 km away
  3. 2.07 km NE of Covelo, California · 15143 days ago · 5 km deep · 70 km away
  4. 2.58 km WNW of Guinda, California · 15143 days ago · 2 km deep · 65 km away
  5. 2.08 km WSW of Cobb, California · 15144 days ago · 3 km deep · 55 km away
  6. 2.0Northern California · 15144 days ago · 1 km deep · 55 km away
  7. 2.23 km SW of Cobb, California · 15144 days ago · 1 km deep · 56 km away
  8. 1.75 km W of Cobb, California · 15144 days ago · 4 km deep · 53 km away
  9. 1.67 km WSW of Cobb, California · 15145 days ago · 3 km deep · 56 km away
  10. 1.615 km WSW of Laytonville, California · 15145 days ago · 3 km deep · 85 km away
  11. 2.55 km SW of Cobb, California · 15145 days ago · 1 km deep · 56 km away
  12. 3.45 km SW of Cobb, California · 15145 days ago · 1 km deep · 56 km away
  13. 2.57 km WSW of Cobb, California · 15146 days ago · 1 km deep · 55 km away
  14. 2.67 km WSW of Cobb, California · 15146 days ago · 1 km deep · 55 km away
  15. 2.311 km SSE of Laytonville, California · 15146 days ago · 7 km deep · 65 km away
  16. 1.74 km WSW of Laytonville, California · 15147 days ago · 4 km deep · 76 km away
  17. 2.29 km WSW of Cobb, California · 15148 days ago · 1 km deep · 55 km away
  18. 2.24 km SW of Cobb, California · 15148 days ago · 1 km deep · 57 km away
  19. 2.516 km NNE of Elk Creek, California · 15148 days ago · 0 km deep · 57 km away
  20. 1.67 km WSW of Cobb, California · 15149 days ago · 1 km deep · 55 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1127372. Read Wed, Sep 30, 2026, 12:39 PM UTC.