California earthquakes

M1.8 earthquake 8 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 8 km WSW of Cobb, California on Mon, Aug 4, 1986, 5:41 AM PDT (12:41 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M4.5 26 km NE of Potter Valley, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1986-08-04 12:41:16 UTC
Depth
3.8 km (2.4 mi), shallow
Epicenter
38.798° N, 122.815° 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, 0.6 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
38°
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: 168 in the 60 days after this one and 106 in the 30 days before it.

After

  1. 1.911 km NE of Clearlake Oaks, California · 14668 days ago · 1 km deep · 40 km away
  2. 1.829 km WSW of Elk Creek, California · 14667 days ago · 13 km deep · 83 km away
  3. 2.15 km WNW of Cobb, California · 14667 days ago · 1 km deep · 5 km away
  4. 2.44 km WSW of Cobb, California · 14666 days ago · 1 km deep · 3 km away
  5. 2.84 km WSW of Cobb, California · 14666 days ago · 2 km deep · 4 km away
  6. 2.27 km W of Cobb, California · 14665 days ago · 3 km deep · 3 km away
  7. 2.28 km W of Cobb, California · 14665 days ago · -1 km deep · 2 km away
  8. 1.95 km WSW of Cobb, California · 14665 days ago · 4 km deep · 3 km away
  9. 1.826 km NE of Potter Valley, California · 14665 days ago · 4 km deep · 78 km away
  10. 1.7Northern California · 14664 days ago · 0 km deep · 4 km away
  11. 1.71 km SE of Healdsburg, California · 14664 days ago · 35 km deep · 22 km away
  12. 1.86 km W of Cobb, California · 14664 days ago · 3 km deep · 3 km away
  13. 1.66 km W of Cobb, California · 14664 days ago · 3 km deep · 3 km away
  14. 1.85 km SW of Cobb, California · 14664 days ago · 1 km deep · 4 km away
  15. 2.14 km WSW of Cobb, California · 14664 days ago · 1 km deep · 4 km away
  16. 1.95 km SW of Cobb, California · 14663 days ago · 0 km deep · 3 km away
  17. 1.76 km SW of Cobb, California · 14663 days ago · -1 km deep · 3 km away
  18. 1.97 km WSW of Cobb, California · 14663 days ago · 2 km deep · 1 km away
  19. 2.25 km WSW of Cobb, California · 14662 days ago · 0 km deep · 4 km away
  20. 1.95 km SW of Cobb, California · 14662 days ago · 1 km deep · 3 km away
  21. 2.65 km SW of Cobb, California · 14662 days ago · 2 km deep · 4 km away
  22. 2.215 km SW of Williams, California · 14662 days ago · 15 km deep · 55 km away
  23. 1.67 km WSW of Cobb, California · 14662 days ago · 1 km deep · 1 km away
  24. 2.30 km S of Sea Ranch, California · 14660 days ago · 0 km deep · 56 km away
  25. 2.46 km SW of Cobb, California · 14660 days ago · 1 km deep · 4 km away
  26. 2.84 km WSW of Cobb, California · 14659 days ago · 1 km deep · 4 km away
  27. 1.77 km W of Cobb, California · 14659 days ago · 3 km deep · 2 km away
  28. 2.710 km NNE of Angwin, California · 14658 days ago · 7 km deep · 38 km away
  29. 2.18 km W of Cobb, California · 14658 days ago · 1 km deep · 3 km away
  30. 1.73 km S of Cobb, California · 14657 days ago · 1 km deep · 7 km away
  31. 2.86 km W of Cobb, California · 14656 days ago · 3 km deep · 3 km away
  32. 2.04 km N of Larkfield-Wikiup, California · 14656 days ago · 5 km deep · 28 km away
  33. 2.35 km SW of Cobb, California · 14654 days ago · 1 km deep · 4 km away
  34. 2.05 km SW of Cobb, California · 14654 days ago · 1 km deep · 4 km away
  35. 2.25 km SW of Cobb, California · 14653 days ago · 1 km deep · 4 km away
  36. 2.96 km W of Cobb, California · 14653 days ago · 3 km deep · 4 km away
  37. 2.67 km WSW of Cobb, California · 14651 days ago · 1 km deep · 1 km away
  38. 2.67 km NE of Cloverdale, California · 14651 days ago · 43 km deep · 14 km away
  39. 1.77 km W of Cobb, California · 14650 days ago · -1 km deep · 3 km away
  40. 2.08 km W of Cobb, California · 14650 days ago · 1 km deep · 2 km away
  41. 3.07 km NNW of Geyserville, California · 14650 days ago · 30 km deep · 11 km away
  42. 1.85 km W of Cobb, California · 14649 days ago · 0 km deep · 3 km away
  43. 2.33 km WNW of Cobb, California · 14649 days ago · 0 km deep · 6 km away
  44. 1.64 km W of Cobb, California · 14649 days ago · 2 km deep · 5 km away
  45. 2.03 km W of Cobb, California · 14649 days ago · 0 km deep · 5 km away
  46. 1.76 km W of Cobb, California · 14649 days ago · 3 km deep · 2 km away
  47. 1.87 km W of Cobb, California · 14648 days ago · 1 km deep · 3 km away
  48. 2.57 km W of Cobb, California · 14648 days ago · 0 km deep · 3 km away
  49. 2.17 km W of Cobb, California · 14648 days ago · 1 km deep · 3 km away
  50. 1.84 km SW of Cobb, California · 14648 days ago · 0 km deep · 5 km away
  51. 2.88 km ESE of Point Arena, California · 14647 days ago · -1 km deep · 69 km away
  52. 1.76 km W of Cobb, California · 14647 days ago · 1 km deep · 4 km away
  53. 2.05 km W of Cobb, California · 14647 days ago · 0 km deep · 3 km away
  54. 2.26 km SW of Cobb, California · 14647 days ago · 1 km deep · 5 km away
  55. 3.66 km E of Talmage, California · 14647 days ago · 4 km deep · 44 km away
  56. 1.75 km W of Middletown, California · 14647 days ago · 7 km deep · 12 km away
  57. 2.412 km NNE of Moskowite Corner, California · 14647 days ago · 14 km deep · 67 km away
  58. 1.97 km NNE of Madison, California · 14647 days ago · 9 km deep · 75 km away
  59. 1.70 km WNW of Redwood Valley, California · 14647 days ago · 6 km deep · 63 km away
  60. 1.64 km W of Cobb, California · 14646 days ago · 1 km deep · 4 km away

The first 60 of 168.

Before

  1. 1.64 km W of Cobb, California · 14670 days ago · 1 km deep · 5 km away
  2. 1.97 km NNE of Windsor, California · 14670 days ago · 2 km deep · 22 km away
  3. 1.717 km NNE of Angwin, California · 14670 days ago · 2 km deep · 39 km away
  4. 1.95 km SW of Cobb, California · 14670 days ago · 0 km deep · 4 km away
  5. 1.97 km W of Cobb, California · 14671 days ago · 3 km deep · 2 km away
  6. 1.61 km ESE of Larkfield-Wikiup, California · 14671 days ago · 4 km deep · 33 km away
  7. 1.61 km ESE of Clearlake, California · 14671 days ago · 4 km deep · 25 km away
  8. 2.25 km WSW of Cobb, California · 14671 days ago · 2 km deep · 3 km away
  9. 1.76 km WSW of Cobb, California · 14672 days ago · 1 km deep · 3 km away
  10. 1.74 km WSW of Cobb, California · 14672 days ago · 1 km deep · 4 km away
  11. 1.77 km W of Cobb, California · 14672 days ago · 3 km deep · 2 km away
  12. 1.64 km W of Cobb, California · 14672 days ago · 0 km deep · 5 km away
  13. 2.74 km W of Cobb, California · 14672 days ago · -1 km deep · 5 km away
  14. 2.67 km W of Cobb, California · 14672 days ago · 3 km deep · 2 km away
  15. 2.39 km SSW of Arbuckle, California · 14673 days ago · 0 km deep · 65 km away
  16. 2.511 km ENE of Potter Valley, California · 14673 days ago · 33 km deep · 63 km away
  17. 4.75 km NNE of Brooktrails, California · 14673 days ago · 58 km deep · 90 km away
  18. 1.56 km W of Cobb, California · 14673 days ago · 3 km deep · 3 km away
  19. 2.04 km W of Cobb, California · 14673 days ago · 0 km deep · 4 km away
  20. 1.84 km W of Cobb, California · 14673 days ago · -1 km deep · 4 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc81912. Read Fri, Oct 2, 2026, 6:37 PM UTC.