California earthquakes

M1.6 earthquake 5 km W of Arbuckle, California

A magnitude 1.6 earthquake struck 5 km W of Arbuckle, California on Sun, Oct 27, 1985, 9:31 AM PST (17:31 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.1 5 km NW of Cobb, California. This one was a foreshock.

Arbuckle 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
1.6 (md), micro
Local time
UTC
1985-10-27 17:31:10 UTC
Depth
7.5 km (4.7 mi), shallow
Epicenter
39.009° N, 122.121° 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 4.0 km horizontally, 3.8 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
261°, 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: 175 in the 60 days after this one and 93 in the 30 days before it.

After

  1. 1.718 km NNE of Nice, California · 14945 days ago · 10 km deep · 60 km away
  2. 1.910 km WSW of Arbuckle, California · 14945 days ago · 13 km deep · 6 km away
  3. 1.710 km W of Cobb, California · 14944 days ago · 1 km deep · 66 km away
  4. 1.68 km W of Cobb, California · 14943 days ago · 0 km deep · 64 km away
  5. 1.68 km W of Cobb, California · 14943 days ago · 1 km deep · 64 km away
  6. 2.48 km NE of Hidden Valley Lake, California · 14942 days ago · 1 km deep · 36 km away
  7. 2.06 km WSW of Cobb, California · 14942 days ago · 1 km deep · 63 km away
  8. 1.74 km WSW of Cobb, California · 14941 days ago · 1 km deep · 61 km away
  9. 2.418 km E of Potter Valley, California · 14941 days ago · 6 km deep · 77 km away
  10. 2.28 km NE of Hidden Valley Lake, California · 14941 days ago · 0 km deep · 36 km away
  11. 2.67 km WSW of Cobb, California · 14941 days ago · 0 km deep · 63 km away
  12. 1.67 km W of Cobb, California · 14940 days ago · 3 km deep · 63 km away
  13. 2.18 km W of Cobb, California · 14940 days ago · -1 km deep · 64 km away
  14. 2.28 km W of Cobb, California · 14940 days ago · -1 km deep · 64 km away
  15. 1.86 km SW of Cobb, California · 14939 days ago · 1 km deep · 61 km away
  16. 2.55 km SW of Cobb, California · 14939 days ago · 1 km deep · 62 km away
  17. 1.78 km NE of Hopland, California · 14938 days ago · 5 km deep · 80 km away
  18. 1.81 km N of Calpella, California · 14938 days ago · 7 km deep · 97 km away
  19. 1.714 km NE of Potter Valley, California · 14938 days ago · 6 km deep · 85 km away
  20. 2.04 km SSE of Rocklin, California · 14938 days ago · 11 km deep · 83 km away
  21. 2.07 km WSW of Cobb, California · 14935 days ago · 2 km deep · 63 km away
  22. 2.36 km W of Cobb, California · 14935 days ago · 4 km deep · 62 km away
  23. 1.65 km WSW of Cobb, California · 14935 days ago · 0 km deep · 62 km away
  24. 1.57 km ENE of Penngrove, California · 14934 days ago · 8 km deep · 86 km away
  25. 1.83 km SW of Cobb, California · 14934 days ago · 1 km deep · 59 km away
  26. 1.84 km W of Upper Lake, California · 14934 days ago · 5 km deep · 75 km away
  27. 1.57 km W of Cobb, California · 14934 days ago · 3 km deep · 63 km away
  28. 2.23 km WSW of Green Valley, California · 14934 days ago · 7 km deep · 85 km away
  29. 1.91 km ENE of Green Valley, California · 14934 days ago · 12 km deep · 83 km away
  30. 1.91 km SW of Lakeport, California · 14934 days ago · 22 km deep · 69 km away
  31. 1.56 km W of Cobb, California · 14934 days ago · 3 km deep · 62 km away
  32. 2.07 km W of Cobb, California · 14934 days ago · 0 km deep · 63 km away
  33. 3.19 km W of Cobb, California · 14934 days ago · 1 km deep · 65 km away
  34. 3.09 km W of Cobb, California · 14934 days ago · -1 km deep · 65 km away
  35. 2.29 km W of Cobb, California · 14934 days ago · 1 km deep · 65 km away
  36. 2.09 km W of Cobb, California · 14934 days ago · 0 km deep · 65 km away
  37. 1.99 km W of Cobb, California · 14934 days ago · 0 km deep · 65 km away
  38. 2.48 km W of Cobb, California · 14934 days ago · 0 km deep · 65 km away
  39. 1.85 km WSW of Cobb, California · 14934 days ago · 1 km deep · 61 km away
  40. 1.75 km W of Cobb, California · 14933 days ago · 1 km deep · 61 km away
  41. 1.77 km W of Cobb, California · 14933 days ago · 3 km deep · 63 km away
  42. 1.716 km WSW of Durham, California · 14933 days ago · 5 km deep · 64 km away
  43. 1.56 km SW of Cobb, California · 14933 days ago · 0 km deep · 61 km away
  44. 2.06 km WSW of Calistoga, California · 14932 days ago · -1 km deep · 67 km away
  45. 2.07 km WSW of Calistoga, California · 14932 days ago · 0 km deep · 69 km away
  46. 1.85 km WNW of Cobb, California · 14932 days ago · 2 km deep · 60 km away
  47. 2.115 km ESE of Suisun, California · 14931 days ago · 11 km deep · 94 km away
  48. 1.69 km W of Cobb, California · 14931 days ago · 0 km deep · 65 km away
  49. 1.75 km WSW of Cobb, California · 14930 days ago · 0 km deep · 61 km away
  50. 1.96 km SW of Cobb, California · 14930 days ago · 1 km deep · 62 km away
  51. 1.75 km SW of Cobb, California · 14930 days ago · 0 km deep · 61 km away
  52. 4.15 km NW of Cobb, California · 14930 days ago · -1 km deep · 59 km away
  53. 1.65 km W of Robbins, California · 14929 days ago · 2 km deep · 34 km away
  54. 1.63 km WNW of Cobb, California · 14929 days ago · 0 km deep · 59 km away
  55. 1.86 km WSW of Cobb, California · 14929 days ago · 3 km deep · 63 km away
  56. 2.03 km WNW of Cobb, California · 14929 days ago · 0 km deep · 59 km away
  57. 1.89 km E of Hopland, California · 14929 days ago · 2 km deep · 77 km away
  58. 2.15 km SW of Cobb, California · 14928 days ago · 1 km deep · 61 km away
  59. 1.66 km W of Cobb, California · 14928 days ago · 2 km deep · 63 km away
  60. 1.914 km E of Angwin, California · 14928 days ago · 1 km deep · 49 km away

The first 60 of 175.

Before

  1. 1.95 km SW of Cobb, California · 14946 days ago · -1 km deep · 61 km away
  2. 1.67 km WSW of Cobb, California · 14946 days ago · 2 km deep · 64 km away
  3. 1.67 km W of Cobb, California · 14947 days ago · 4 km deep · 63 km away
  4. 2.59 km W of Hopland, California · 14947 days ago · 5 km deep · 96 km away
  5. 1.85 km SW of Cobb, California · 14947 days ago · 1 km deep · 62 km away
  6. 1.85 km SW of Cobb, California · 14947 days ago · -1 km deep · 62 km away
  7. 1.527 km NNE of Potter Valley, California · 14947 days ago · 9 km deep · 95 km away
  8. 1.66 km SW of Cobb, California · 14947 days ago · 0 km deep · 62 km away
  9. 1.84 km WSW of Cobb, California · 14947 days ago · 1 km deep · 61 km away
  10. 1.910 km WSW of Cobb, California · 14947 days ago · 2 km deep · 67 km away
  11. 2.34 km WSW of Chico, California · 14947 days ago · 22 km deep · 81 km away
  12. 1.75 km WSW of Cobb, California · 14948 days ago · 0 km deep · 62 km away
  13. 2.410 km SSE of Hamilton City, California · 14948 days ago · 21 km deep · 73 km away
  14. 2.25 km W of Cobb, California · 14948 days ago · 0 km deep · 61 km away
  15. 2.27 km W of Cobb, California · 14948 days ago · 3 km deep · 63 km away
  16. 1.68 km W of Cobb, California · 14948 days ago · 0 km deep · 64 km away
  17. 2.18 km W of Cobb, California · 14948 days ago · 1 km deep · 64 km away
  18. 1.923 km WSW of Williams, California · 14948 days ago · 1 km deep · 24 km away
  19. 2.65 km E of Rohnert Park, California · 14949 days ago · 7 km deep · 86 km away
  20. 1.69 km SE of Hopland, California · 14949 days ago · 1 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc57748. Read Mon, Sep 28, 2026, 6:19 AM UTC.