California earthquakes

M1.8 earthquake 6 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 6 km WSW of Cobb, California on Tue, Aug 27, 1985, 6:13 PM PDT (01:13 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M3.6 7 km W of Cobb, 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
1.8 (md), micro
Local time
UTC
1985-08-28 01:13:29 UTC
Depth
0.6 km (0.4 mi), shallow
Epicenter
38.808° N, 122.793° 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
±0.13
Depth from
From location
Station coverage gap
57°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 181 in the 60 days after this one and 87 in the 30 days before it.

After

  1. 2.20 km S of Brooktrails, California · 15006 days ago · -1 km deep · 87 km away
  2. 1.58 km W of Cobb, California · 15006 days ago · 1 km deep · 3 km away
  3. 2.013 km NW of Moskowite Corner, California · 15006 days ago · 0 km deep · 53 km away
  4. 2.513 km NW of Moskowite Corner, California · 15005 days ago · 0 km deep · 53 km away
  5. 2.015 km NNW of Moskowite Corner, California · 15005 days ago · 15 km deep · 54 km away
  6. 1.614 km NNW of Moskowite Corner, California · 15005 days ago · 3 km deep · 54 km away
  7. 1.58 km NNW of Moskowite Corner, California · 15005 days ago · 6 km deep · 59 km away
  8. 1.913 km NNW of Moskowite Corner, California · 15005 days ago · 2 km deep · 54 km away
  9. 2.25 km SW of Cobb, California · 15005 days ago · 0 km deep · 3 km away
  10. 2.07 km W of Cobb, California · 15004 days ago · 3 km deep · 2 km away
  11. 2.520 km WSW of Williams, California · 15004 days ago · 2 km deep · 49 km away
  12. 2.220 km WSW of Williams, California · 15004 days ago · 0 km deep · 48 km away
  13. 2.021 km WSW of Williams, California · 15004 days ago · 2 km deep · 48 km away
  14. 1.94 km W of Cobb, California · 15003 days ago · 1 km deep · 2 km away
  15. 1.96 km SW of Cobb, California · 15003 days ago · 0 km deep · 3 km away
  16. 1.84 km W of Cobb, California · 15003 days ago · 0 km deep · 2 km away
  17. 1.96 km W of Cobb, California · 15003 days ago · 2 km deep · 1 km away
  18. 2.26 km W of Cobb, California · 15002 days ago · 0 km deep · 1 km away
  19. 2.420 km WSW of Williams, California · 15001 days ago · 2 km deep · 49 km away
  20. 2.620 km WSW of Williams, California · 15001 days ago · 2 km deep · 49 km away
  21. 1.89 km ESE of Willits, California · 15001 days ago · 8 km deep · 76 km away
  22. 1.922 km WSW of Williams, California · 15000 days ago · 2 km deep · 48 km away
  23. 2.33 km SW of Cobb, California · 15000 days ago · 1 km deep · 4 km away
  24. 1.78 km WSW of Cobb, California · 15000 days ago · 3 km deep · 2 km away
  25. 1.95 km SW of Cobb, California · 15000 days ago · 0 km deep · 4 km away
  26. 1.614 km ENE of Clearlake Oaks, California · 15000 days ago · 10 km deep · 38 km away
  27. 1.56 km W of Cobb, California · 15000 days ago · 3 km deep · 1 km away
  28. 2.55 km SSW of Cobb, California · 15000 days ago · 1 km deep · 4 km away
  29. 1.68 km WSW of Cobb, California · 14999 days ago · 4 km deep · 2 km away
  30. 3.214 km NW of Moskowite Corner, California · 14999 days ago · 4 km deep · 53 km away
  31. 1.913 km NNW of Moskowite Corner, California · 14999 days ago · 1 km deep · 54 km away
  32. 1.913 km NW of Moskowite Corner, California · 14999 days ago · 0 km deep · 53 km away
  33. 1.65 km SW of Cobb, California · 14998 days ago · 0 km deep · 3 km away
  34. 1.56 km W of Cobb, California · 14998 days ago · 3 km deep · 2 km away
  35. 2.913 km NW of Moskowite Corner, California · 14997 days ago · 4 km deep · 53 km away
  36. 2.713 km NW of Moskowite Corner, California · 14997 days ago · 3 km deep · 53 km away
  37. 1.710 km SSE of Moskowite Corner, California · 14997 days ago · 5 km deep · 76 km away
  38. 2.13 km NNW of Larkfield-Wikiup, California · 14997 days ago · 4 km deep · 30 km away
  39. 1.78 km W of Cobb, California · 14997 days ago · 0 km deep · 2 km away
  40. 2.313 km NNW of Moskowite Corner, California · 14997 days ago · 0 km deep · 55 km away
  41. 2.413 km NW of Moskowite Corner, California · 14997 days ago · 0 km deep · 53 km away
  42. 2.114 km NNW of Moskowite Corner, California · 14997 days ago · 2 km deep · 53 km away
  43. 1.56 km W of Cobb, California · 14997 days ago · 1 km deep · 3 km away
  44. 1.98 km WSW of Cobb, California · 14997 days ago · 0 km deep · 2 km away
  45. 1.56 km W of Cobb, California · 14996 days ago · 3 km deep · 2 km away
  46. 2.36 km SW of Cobb, California · 14996 days ago · 0 km deep · 3 km away
  47. 1.66 km SW of Cobb, California · 14996 days ago · 0 km deep · 3 km away
  48. 2.713 km NNW of Moskowite Corner, California · 14996 days ago · 2 km deep · 53 km away
  49. 1.96 km WSW of Cobb, California · 14996 days ago · 3 km deep · 1 km away
  50. 1.68 km NW of Moskowite Corner, California · 14996 days ago · 2 km deep · 58 km away
  51. 1.77 km WNW of Cobb, California · 14996 days ago · -1 km deep · 4 km away
  52. 1.64 km N of Cobb, California · 14996 days ago · 2 km deep · 8 km away
  53. 2.54 km WSW of Cobb, California · 14996 days ago · 2 km deep · 2 km away
  54. 1.69 km W of Cobb, California · 14996 days ago · 2 km deep · 4 km away
  55. 2.36 km W of Cobb, California · 14996 days ago · 3 km deep · 1 km away
  56. 2.58 km W of Cobb, California · 14996 days ago · 0 km deep · 2 km away
  57. 1.87 km W of Cobb, California · 14996 days ago · 0 km deep · 2 km away
  58. 2.16 km W of Cobb, California · 14996 days ago · 2 km deep · 1 km away
  59. 1.65 km WSW of Cobb, California · 14995 days ago · 1 km deep · 1 km away
  60. 2.74 km WSW of Cobb, California · 14995 days ago · 2 km deep · 1 km away

The first 60 of 181.

Before

  1. 1.86 km WSW of Cobb, California · 15006 days ago · 0 km deep · 0 km away
  2. 2.113 km NNW of Moskowite Corner, California · 15006 days ago · 0 km deep · 53 km away
  3. 1.67 km WSW of Cobb, California · 15007 days ago · 0 km deep · 1 km away
  4. 2.19 km NNW of Kenwood, California · 15008 days ago · 6 km deep · 39 km away
  5. 1.66 km NNE of Hopland, California · 15008 days ago · 0 km deep · 35 km away
  6. 1.69 km WSW of Cobb, California · 15009 days ago · 1 km deep · 3 km away
  7. 1.63 km N of Clearlake, California · 15009 days ago · -1 km deep · 25 km away
  8. 1.96 km WSW of Cobb, California · 15009 days ago · 3 km deep · 1 km away
  9. 2.05 km WNW of Cobb, California · 15009 days ago · 1 km deep · 3 km away
  10. 1.97 km WSW of Cobb, California · 15009 days ago · 4 km deep · 1 km away
  11. 1.63 km NNE of Clearlake, California · 15010 days ago · -1 km deep · 25 km away
  12. 2.93 km NNE of Clearlake, California · 15010 days ago · 1 km deep · 25 km away
  13. 2.28 km WSW of Cobb, California · 15010 days ago · 3 km deep · 2 km away
  14. 1.98 km WSW of Cobb, California · 15010 days ago · 3 km deep · 2 km away
  15. 2.07 km W of Cobb, California · 15011 days ago · 3 km deep · 2 km away
  16. 1.85 km WSW of Cobb, California · 15011 days ago · 0 km deep · 2 km away
  17. 1.55 km WSW of Cobb, California · 15011 days ago · 0 km deep · 2 km away
  18. 1.55 km SW of Cobb, California · 15012 days ago · 1 km deep · 4 km away
  19. 1.76 km NE of Brooktrails, California · 15012 days ago · 7 km deep · 87 km away
  20. 1.65 km WSW of Cobb, California · 15012 days ago · 1 km deep · 0 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc55209. Read Mon, Sep 28, 2026, 3:25 AM UTC.