California earthquakes

M1.5 earthquake 6 km W of Cobb, California

A magnitude 1.5 earthquake struck 6 km W of Cobb, California on Mon, Mar 18, 1985, 3:27 AM PST (11:27 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M1.9 19 km WSW of Williams, California. This one was a foreshock.

Cobb 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
1.5 (md), micro
Local time
UTC
1985-03-18 11:27:34 UTC
Depth
0.6 km (0.4 mi), shallow
Epicenter
38.813° N, 122.797° 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, 0.3 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
71°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 179 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.919 km WSW of Williams, California · 15152 days ago · 1 km deep · 50 km away
  2. 1.67 km WSW of Cobb, California · 15152 days ago · 1 km deep · 1 km away
  3. 1.64 km NNE of Clearlake, California · 15152 days ago · 0 km deep · 26 km away
  4. 1.97 km W of Cobb, California · 15152 days ago · 3 km deep · 1 km away
  5. 2.313 km SSW of Guinda, California · 15152 days ago · 0 km deep · 47 km away
  6. 1.62 km SSE of Clear Lake Riviera, California · 15151 days ago · 3 km deep · 16 km away
  7. 2.420 km WSW of Williams, California · 15151 days ago · 0 km deep · 49 km away
  8. 3.37 km W of Cobb, California · 15151 days ago · 4 km deep · 1 km away
  9. 1.818 km W of Williams, California · 15150 days ago · 4 km deep · 51 km away
  10. 1.77 km WSW of Cobb, California · 15150 days ago · 1 km deep · 2 km away
  11. 1.67 km W of Cobb, California · 15150 days ago · 3 km deep · 1 km away
  12. 1.65 km SW of Cobb, California · 15150 days ago · 0 km deep · 4 km away
  13. 1.62 km SW of Cobb, California · 15150 days ago · -1 km deep · 5 km away
  14. 1.75 km W of Cobb, California · 15150 days ago · 0 km deep · 1 km away
  15. 1.67 km W of Cobb, California · 15150 days ago · 3 km deep · 1 km away
  16. 1.78 km W of Cobb, California · 15150 days ago · 1 km deep · 2 km away
  17. 1.6Northern California · 15150 days ago · 9 km deep · 48 km away
  18. 2.56 km E of Santa Rosa, California · 15149 days ago · 1 km deep · 44 km away
  19. 1.66 km WSW of Cobb, California · 15149 days ago · 3 km deep · 1 km away
  20. 3.220 km WSW of Williams, California · 15149 days ago · 5 km deep · 48 km away
  21. 1.719 km WSW of Williams, California · 15149 days ago · 2 km deep · 49 km away
  22. 2.420 km WSW of Williams, California · 15149 days ago · 1 km deep · 50 km away
  23. 1.617 km W of Williams, California · 15149 days ago · 3 km deep · 52 km away
  24. 1.56 km ESE of Hopland, California · 15149 days ago · 1 km deep · 27 km away
  25. 2.220 km WSW of Williams, California · 15148 days ago · 6 km deep · 49 km away
  26. 2.520 km WSW of Williams, California · 15148 days ago · 5 km deep · 49 km away
  27. 1.57 km WSW of Cobb, California · 15148 days ago · 5 km deep · 3 km away
  28. 1.64 km W of Cobb, California · 15148 days ago · -1 km deep · 2 km away
  29. 2.417 km WSW of Williams, California · 15148 days ago · 5 km deep · 52 km away
  30. 3.15 km WSW of Cobb, California · 15147 days ago · 0 km deep · 2 km away
  31. 1.95 km W of Cobb, California · 15147 days ago · 0 km deep · 2 km away
  32. 1.95 km SW of Cobb, California · 15146 days ago · 0 km deep · 3 km away
  33. 2.219 km WSW of Williams, California · 15146 days ago · 4 km deep · 50 km away
  34. 2.120 km WSW of Williams, California · 15146 days ago · 2 km deep · 48 km away
  35. 2.18 km WSW of Cobb, California · 15146 days ago · 3 km deep · 2 km away
  36. 1.76 km W of Cobb, California · 15146 days ago · 3 km deep · 1 km away
  37. 1.97 km WSW of Cobb, California · 15145 days ago · 1 km deep · 2 km away
  38. 1.94 km N of Larkfield-Wikiup, California · 15145 days ago · 3 km deep · 29 km away
  39. 2.67 km WSW of Cobb, California · 15145 days ago · 0 km deep · 2 km away
  40. 2.27 km NNE of Elk Creek, California · 15145 days ago · 12 km deep · 98 km away
  41. 1.68 km W of Cobb, California · 15144 days ago · 1 km deep · 2 km away
  42. 2.04 km NNW of Larkfield-Wikiup, California · 15144 days ago · 3 km deep · 29 km away
  43. 1.94 km W of Cobb, CA · 15144 days ago · 0 km deep · 3 km away
  44. 2.09 km N of Upper Lake, California · 15144 days ago · 4 km deep · 49 km away
  45. 2.63 km SSE of Clear Lake Riviera, California · 15144 days ago · 2 km deep · 15 km away
  46. 1.72 km SSE of Clear Lake Riviera, California · 15144 days ago · 1 km deep · 15 km away
  47. 1.56 km WSW of Cobb, California · 15144 days ago · 0 km deep · 1 km away
  48. 2.15 km WSW of Cobb, California · 15144 days ago · 1 km deep · 1 km away
  49. 1.66 km WSW of Cobb, California · 15143 days ago · -1 km deep · 1 km away
  50. 1.75 km W of Cobb, California · 15143 days ago · 1 km deep · 1 km away
  51. 3.114 km N of Brooktrails, California · 15143 days ago · -1 km deep · 98 km away
  52. 1.820 km WSW of Williams, California · 15143 days ago · 4 km deep · 48 km away
  53. 2.55 km N of Windsor, California · 15142 days ago · 5 km deep · 24 km away
  54. 3.16 km W of Cobb, California · 15142 days ago · 4 km deep · 1 km away
  55. 1.78 km W of Cobb, California · 15142 days ago · 0 km deep · 2 km away
  56. 1.96 km W of Cobb, California · 15142 days ago · 0 km deep · 1 km away
  57. 2.15 km SW of Cobb, California · 15142 days ago · 1 km deep · 3 km away
  58. 1.76 km W of Cobb, California · 15141 days ago · 3 km deep · 1 km away
  59. 1.96 km W of Cobb, California · 15141 days ago · 3 km deep · 1 km away
  60. 2.26 km W of Cobb, California · 15141 days ago · 3 km deep · 1 km away

The first 60 of 179.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc44156. Read Tue, Sep 22, 2026, 10:41 AM UTC.