California earthquakes

M1.9 earthquake 5 km SW of Cobb, California

A magnitude 1.9 earthquake struck 5 km SW of Cobb, California on Fri, Sep 20, 1985, 11:31 PM PDT (06:31 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M4.1 5 km NW 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
1.9 (md), micro
Local time
UTC
1985-09-21 06:31:27 UTC
Depth
1.5 km (0.9 mi), shallow
Epicenter
38.786° N, 122.772° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
38°
Stations used
23

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 174 in the 60 days after this one and 141 in the 30 days before it.

After

  1. 2.46 km W of Cobb, California · 14983 days ago · 1 km deep · 5 km away
  2. 1.99 km W of Cobb, California · 14982 days ago · 0 km deep · 7 km away
  3. 1.57 km WSW of Cobb, California · 14982 days ago · 0 km deep · 4 km away
  4. 1.63 km SW of Cobb, California · 14982 days ago · 1 km deep · 2 km away
  5. 1.57 km W of Cobb, California · 14981 days ago · 1 km deep · 5 km away
  6. 1.65 km WSW of Cobb, California · 14981 days ago · 1 km deep · 2 km away
  7. 1.85 km NNE of Windsor, California · 14981 days ago · 5 km deep · 22 km away
  8. 2.36 km NNE of Windsor, California · 14981 days ago · 1 km deep · 21 km away
  9. 2.510 km N of Cloverdale, California · 14981 days ago · -1 km deep · 23 km away
  10. 3.15 km WSW of Cobb, California · 14980 days ago · -1 km deep · 2 km away
  11. 1.95 km WSW of Cobb, California · 14980 days ago · 0 km deep · 1 km away
  12. 1.64 km S of Cobb, California · 14980 days ago · 2 km deep · 4 km away
  13. 2.55 km SW of Cobb, California · 14980 days ago · 0 km deep · 1 km away
  14. 2.19 km ENE of Hopland, California · 14979 days ago · 23 km deep · 31 km away
  15. 2.05 km S of Moskowite Corner, California · 14979 days ago · 8 km deep · 66 km away
  16. 2.47 km W of Cobb, California · 14979 days ago · 3 km deep · 5 km away
  17. 1.75 km SW of Cobb, California · 14979 days ago · 1 km deep · 0 km away
  18. 1.97 km ENE of Clearlake, California · 14979 days ago · 3 km deep · 30 km away
  19. 1.77 km W of Cobb, California · 14979 days ago · 3 km deep · 5 km away
  20. 2.52 km E of Moskowite Corner, California · 14979 days ago · 4 km deep · 65 km away
  21. 1.63 km NE of Santa Rosa, California · 14978 days ago · 2 km deep · 36 km away
  22. 2.28 km W of Cobb, California · 14977 days ago · 1 km deep · 6 km away
  23. 1.51 km ESE of Clear Lake Riviera, California · 14977 days ago · 1 km deep · 19 km away
  24. 1.64 km ESE of Moskowite Corner, California · 14977 days ago · 5 km deep · 68 km away
  25. 1.62 km E of Rodeo, California · 14976 days ago · 4 km deep · 96 km away
  26. 2.06 km W of Cobb, California · 14976 days ago · 2 km deep · 4 km away
  27. 1.76 km W of Cobb, California · 14976 days ago · 3 km deep · 5 km away
  28. 1.74 km S of Cobb, California · 14976 days ago · 2 km deep · 4 km away
  29. 1.64 km S of Cobb, California · 14975 days ago · 2 km deep · 4 km away
  30. 1.65 km SW of Cobb, California · 14975 days ago · 1 km deep · 0 km away
  31. 2.019 km N of Upper Lake, California · 14975 days ago · 5 km deep · 62 km away
  32. 1.89 km W of Cobb, California · 14973 days ago · 0 km deep · 6 km away
  33. 1.74 km WSW of Cobb, California · 14973 days ago · 1 km deep · 2 km away
  34. 1.98 km WSW of Cobb, California · 14972 days ago · 1 km deep · 4 km away
  35. 1.64 km SE of Larkfield-Wikiup, California · 14972 days ago · 8 km deep · 33 km away
  36. 1.812 km WNW of Calistoga, California · 14971 days ago · 8 km deep · 18 km away
  37. 2.58 km W of Cobb, California · 14970 days ago · 1 km deep · 6 km away
  38. 1.64 km NW of Redwood Valley, California · 14970 days ago · 7 km deep · 69 km away
  39. 2.34 km WSW of Cobb, California · 14970 days ago · 1 km deep · 2 km away
  40. 1.711 km NW of Moskowite Corner, California · 14969 days ago · 4 km deep · 52 km away
  41. 2.25 km WSW of Cobb, California · 14969 days ago · 1 km deep · 3 km away
  42. 1.86 km SSE of Moskowite Corner, California · 14969 days ago · 5 km deep · 68 km away
  43. 2.24 km W of Cobb, California · 14968 days ago · 0 km deep · 4 km away
  44. 3.28 km SE of Hopland, California · 14968 days ago · 4 km deep · 28 km away
  45. 1.58 km SE of Hopland, California · 14968 days ago · 1 km deep · 28 km away
  46. 1.613 km SSE of Boonville, California · 14967 days ago · -1 km deep · 47 km away
  47. 2.48 km SE of Hopland, California · 14967 days ago · 2 km deep · 28 km away
  48. 2.78 km NW of Redwood Valley, California · 14967 days ago · -1 km deep · 74 km away
  49. 2.56 km W of Cobb, California · 14967 days ago · 3 km deep · 5 km away
  50. 1.98 km SE of Hopland, California · 14967 days ago · 1 km deep · 28 km away
  51. 1.88 km WSW of Cobb, California · 14967 days ago · 3 km deep · 3 km away
  52. 1.8Northern California · 14966 days ago · 0 km deep · 5 km away
  53. 2.28 km W of Cobb, California · 14966 days ago · 0 km deep · 6 km away
  54. 2.55 km SW of Cobb, California · 14965 days ago · 0 km deep · 0 km away
  55. 1.95 km SW of Cobb, California · 14965 days ago · 0 km deep · 0 km away
  56. 1.65 km W of Cobb, California · 14965 days ago · 0 km deep · 5 km away
  57. 1.57 km WSW of Cobb, California · 14964 days ago · 1 km deep · 2 km away
  58. 2.112 km NNW of Potter Valley, California · 14964 days ago · 5 km deep · 79 km away
  59. 2.05 km SW of Cobb, California · 14963 days ago · 2 km deep · 1 km away
  60. 1.97 km NNE of Upper Lake, California · 14963 days ago · 7 km deep · 51 km away

The first 60 of 174.

Before

  1. 2.27 km W of Cobb, California · 14984 days ago · 3 km deep · 4 km away
  2. 1.86 km SW of Hopland, California · 14984 days ago · 4 km deep · 39 km away
  3. 2.16 km W of Cobb, California · 14984 days ago · 1 km deep · 6 km away
  4. 1.97 km W of Cobb, California · 14985 days ago · 0 km deep · 4 km away
  5. 1.86 km WSW of Cobb, California · 14985 days ago · 1 km deep · 3 km away
  6. 1.610 km NW of Cobb, California · 14985 days ago · 1 km deep · 11 km away
  7. 2.14 km SW of Cobb, California · 14985 days ago · -1 km deep · 2 km away
  8. 1.85 km E of Clearlake Oaks, California · 14986 days ago · -1 km deep · 30 km away
  9. 1.66 km SW of Cobb, California · 14986 days ago · 0 km deep · 0 km away
  10. 2.36 km ENE of Williams, California · 14987 days ago · 16 km deep · 74 km away
  11. 2.07 km ESE of Williams, California · 14987 days ago · 8 km deep · 72 km away
  12. 2.09 km WNW of Arbuckle, California · 14987 days ago · 5 km deep · 62 km away
  13. 2.55 km ENE of Williams, California · 14987 days ago · 10 km deep · 73 km away
  14. 2.55 km SW of Cobb, California · 14987 days ago · 1 km deep · 0 km away
  15. 1.65 km SW of Cobb, California · 14988 days ago · 0 km deep · 0 km away
  16. 2.110 km E of Comptche, California · 14988 days ago · 8 km deep · 79 km away
  17. 1.86 km WSW of Cobb, California · 14988 days ago · 4 km deep · 3 km away
  18. 1.910 km NNW of Moskowite Corner, California · 14988 days ago · 9 km deep · 55 km away
  19. 1.95 km SW of Cobb, California · 14988 days ago · 0 km deep · 0 km away
  20. 1.76 km W of Cobb, California · 14988 days ago · 2 km deep · 4 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc55537. Read Tue, Sep 29, 2026, 4:10 PM UTC.