California earthquakes

M3.1 earthquake 5 km W of Cobb, California

A magnitude 3.1 earthquake struck 5 km W of Cobb, California on Tue, Oct 28, 1986, 1:29 PM PST (21:29 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M3.7 5 km SW 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
3.1 (md), minor
Local time
UTC
1986-10-28 21:29:00 UTC
Depth
0.6 km (0.4 mi), shallow
Epicenter
38.820° N, 122.782° 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, 0.4 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
49°
Stations used
33

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 0 in the 30 days before it.

After

  1. 2.19 km W of Cobb, California · 14563 days ago · -1 km deep · 4 km away
  2. 1.66 km W of Cobb, California · 14563 days ago · 2 km deep · 1 km away
  3. 1.79 km WNW of Cazadero, California · 14562 days ago · 4 km deep · 46 km away
  4. 2.67 km W of Cobb, California · 14562 days ago · 3 km deep · 3 km away
  5. 1.94 km W of Cobb, California · 14561 days ago · 0 km deep · 1 km away
  6. 2.811 km S of Kelseyville, California · 14561 days ago · 2 km deep · 9 km away
  7. 2.46 km WSW of Cobb, California · 14561 days ago · 1 km deep · 2 km away
  8. 2.218 km W of Cloverdale, California · 14561 days ago · 5 km deep · 39 km away
  9. 1.75 km SW of Cobb, California · 14561 days ago · 0 km deep · 4 km away
  10. 2.85 km SW of Cobb, California · 14561 days ago · 0 km deep · 3 km away
  11. 3.75 km SW of Cobb, California · 14561 days ago · 0 km deep · 3 km away
  12. 1.85 km WSW of Cobb, California · 14561 days ago · 0 km deep · 2 km away
  13. 1.65 km WSW of Cobb, California · 14560 days ago · 1 km deep · 2 km away
  14. 1.610 km W of Ukiah, California · 14560 days ago · 4 km deep · 59 km away
  15. 1.54 km WNW of Cobb, California · 14560 days ago · 2 km deep · 2 km away
  16. 1.75 km WSW of Cobb, California · 14560 days ago · 2 km deep · 1 km away
  17. 1.95 km WSW of Cobb, California · 14559 days ago · 4 km deep · 2 km away
  18. 1.66 km W of Cobb, California · 14559 days ago · 1 km deep · 1 km away
  19. 2.16 km W of Cobb, California · 14559 days ago · 2 km deep · 1 km away
  20. 2.06 km W of Cobb, California · 14559 days ago · 3 km deep · 2 km away
  21. 2.53 km NNE of Guerneville, California · 14557 days ago · 0 km deep · 36 km away
  22. 3.010 km W of Cobb, California · 14556 days ago · 0 km deep · 5 km away
  23. 2.87 km W of Cobb, California · 14556 days ago · 1 km deep · 2 km away
  24. 1.52 km NE of Hidden Valley Lake, California · 14556 days ago · 4 km deep · 21 km away
  25. 2.57 km W of Cobb, California · 14555 days ago · -1 km deep · 3 km away
  26. 2.16 km SSW of Clear Lake Riviera, California · 14555 days ago · 1 km deep · 9 km away
  27. 1.99 km ESE of Hidden Valley Lake, California · 14553 days ago · 6 km deep · 28 km away
  28. 2.22 km NE of Green Valley, California · 14553 days ago · 12 km deep · 83 km away
  29. 3.06 km W of Cobb, California · 14552 days ago · 4 km deep · 1 km away
  30. 2.11 km SSW of Hopland, California · 14552 days ago · 6 km deep · 34 km away
  31. 2.04 km WNW of Cobb, California · 14552 days ago · 2 km deep · 2 km away
  32. 1.79 km WSW of Cobb, California · 14551 days ago · 0 km deep · 5 km away
  33. 1.85 km E of Hidden Valley Lake, California · 14551 days ago · 11 km deep · 25 km away
  34. 2.311 km ESE of Hidden Valley Lake, California · 14551 days ago · 11 km deep · 31 km away
  35. 2.08 km WSW of Cobb, California · 14550 days ago · 3 km deep · 3 km away
  36. 2.312 km WNW of Calistoga, California · 14550 days ago · 6 km deep · 23 km away
  37. 1.99 km WSW of Cobb, California · 14550 days ago · 3 km deep · 4 km away
  38. 2.712 km E of Hidden Valley Lake, California · 14549 days ago · 13 km deep · 32 km away
  39. 1.911 km ESE of Hidden Valley Lake, California · 14549 days ago · 6 km deep · 30 km away
  40. 1.922 km NNE of Upper Lake, California · 14548 days ago · 0 km deep · 60 km away
  41. 2.17 km WSW of Cobb, California · 14548 days ago · 0 km deep · 3 km away
  42. 2.46 km W of Cobb, California · 14548 days ago · 2 km deep · 1 km away
  43. 2.67 km WSW of Cobb, California · 14548 days ago · 0 km deep · 3 km away
  44. 2.38 km W of Cobb, California · 14547 days ago · 4 km deep · 3 km away
  45. 1.811 km E of Hidden Valley Lake, California · 14547 days ago · 11 km deep · 31 km away
  46. 2.39 km W of Cobb, California · 14546 days ago · 0 km deep · 5 km away
  47. 2.05 km W of Cobb, California · 14546 days ago · 1 km deep · 1 km away
  48. 1.510 km ESE of Hidden Valley Lake, California · 14546 days ago · 7 km deep · 29 km away
  49. 1.85 km SW of Cobb, California · 14545 days ago · 2 km deep · 4 km away
  50. 2.35 km ENE of Willits, California · 14545 days ago · 1 km deep · 82 km away
  51. 1.97 km WSW of Cobb, California · 14544 days ago · 4 km deep · 3 km away
  52. 1.69 km W of Cobb, California · 14544 days ago · 0 km deep · 4 km away
  53. 3.06 km W of Cobb, California · 14543 days ago · 3 km deep · 1 km away
  54. 1.69 km ESE of Hidden Valley Lake, California · 14543 days ago · 7 km deep · 29 km away
  55. 1.77 km W of Cobb, California · 14542 days ago · 3 km deep · 3 km away
  56. 1.621 km ENE of Potter Valley, California · 14542 days ago · 5 km deep · 65 km away
  57. 1.66 km W of Cobb, California · 14542 days ago · 3 km deep · 2 km away
  58. 2.14 km SW of Cobb, California · 14541 days ago · 1 km deep · 4 km away
  59. 1.68 km WNW of Cobb, California · 14541 days ago · 0 km deep · 4 km away
  60. 1.94 km SW of Clearlake, California · 14541 days ago · 3 km deep · 16 km away

The first 60 of 180.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc86713 (also filed as usp0002zfg). Read Tue, Sep 22, 2026, 4:52 AM UTC.