California earthquakes

M2.1 earthquake 15 km NNE of Angwin, California

A magnitude 2.1 earthquake struck 15 km NNE of Angwin, California on Mon, Sep 1, 1986, 3:34 PM PDT (22:34 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M4.5 26 km NE of Potter Valley, California. This one was a foreshock.

Angwin 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
2.1 (md), micro
Local time
UTC
1986-09-01 22:34:10 UTC
Depth
4.5 km (2.8 mi), shallow
Epicenter
38.705° N, 122.398° 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 0.4 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
78°
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: 155 in the 60 days after this one and 85 in the 30 days before it.

After

  1. 2.63 km WNW of Cobb, California · 14635 days ago · 0 km deep · 34 km away
  2. 2.13 km WNW of Cobb, California · 14635 days ago · 0 km deep · 34 km away
  3. 2.73 km WNW of Cobb, California · 14635 days ago · 0 km deep · 34 km away
  4. 1.75 km SW of Cobb, California · 14634 days ago · 0 km deep · 33 km away
  5. 1.86 km W of Cobb, California · 14634 days ago · 3 km deep · 37 km away
  6. 2.35 km WSW of Cobb, California · 14634 days ago · -1 km deep · 35 km away
  7. 1.96 km WSW of Cobb, California · 14634 days ago · 0 km deep · 35 km away
  8. 1.66 km ENE of Larkfield-Wikiup, California · 14634 days ago · 4 km deep · 31 km away
  9. 1.55 km WSW of Cobb, California · 14634 days ago · 1 km deep · 34 km away
  10. 2.85 km SW of Cobb, California · 14634 days ago · 0 km deep · 33 km away
  11. 2.32 km WNW of Cobb, California · 14633 days ago · -1 km deep · 33 km away
  12. 1.75 km SW of Cobb, California · 14633 days ago · 2 km deep · 34 km away
  13. 1.913 km SE of Hidden Valley Lake, California · 14633 days ago · 5 km deep · 4 km away
  14. 1.66 km W of Cobb, California · 14633 days ago · 3 km deep · 37 km away
  15. 2.55 km SW of Cobb, California · 14633 days ago · 0 km deep · 33 km away
  16. 1.74 km W of Cobb, California · 14632 days ago · 1 km deep · 36 km away
  17. 2.611 km NE of Linda, California · 14632 days ago · 1 km deep · 98 km away
  18. 2.37 km W of Cobb, California · 14632 days ago · 0 km deep · 38 km away
  19. 2.94 km S of Cobb, California · 14632 days ago · 1 km deep · 29 km away
  20. 1.83 km S of Cobb, California · 14632 days ago · 1 km deep · 30 km away
  21. 3.46 km W of Cobb, California · 14631 days ago · 1 km deep · 37 km away
  22. 3.46 km W of Cobb, California · 14631 days ago · -1 km deep · 37 km away
  23. 1.76 km W of Cobb, California · 14631 days ago · 3 km deep · 37 km away
  24. 1.52 km NW of Larkfield-Wikiup, California · 14630 days ago · 3 km deep · 38 km away
  25. 1.84 km W of Cobb, California · 14630 days ago · 0 km deep · 36 km away
  26. 1.95 km SW of Cobb, California · 14630 days ago · 2 km deep · 34 km away
  27. 1.922 km NNE of Upper Lake, California · 14630 days ago · 13 km deep · 82 km away
  28. 2.03 km WNW of Cobb, California · 14628 days ago · 0 km deep · 35 km away
  29. 1.710 km E of Calpella, California · 14628 days ago · 2 km deep · 83 km away
  30. 2.03 km W of Forestville, California · 14628 days ago · 0 km deep · 53 km away
  31. 1.75 km WNW of Cobb, California · 14628 days ago · 1 km deep · 36 km away
  32. 2.01 km NE of El Cerrito, California · 14627 days ago · 6 km deep · 87 km away
  33. 1.97 km WSW of Cobb, California · 14627 days ago · 2 km deep · 37 km away
  34. 2.018 km NE of Upper Lake, California · 14626 days ago · 4 km deep · 74 km away
  35. 4.526 km NE of Potter Valley, California · 14626 days ago · 4 km deep · 94 km away
  36. 1.611 km WSW of Cloverdale, California · 14625 days ago · 4 km deep · 64 km away
  37. 2.26 km W of Cobb, California · 14625 days ago · 1 km deep · 37 km away
  38. 2.04 km WSW of Cobb, California · 14625 days ago · 1 km deep · 35 km away
  39. 2.22 km NNW of Talmage, California · 14624 days ago · -1 km deep · 84 km away
  40. 2.05 km WNW of Cobb, California · 14624 days ago · 2 km deep · 36 km away
  41. 2.07 km WSW of Cobb, California · 14624 days ago · 3 km deep · 37 km away
  42. 2.47 km W of Cobb, California · 14623 days ago · 2 km deep · 38 km away
  43. 1.77 km W of Cobb, California · 14623 days ago · 3 km deep · 38 km away
  44. 2.45 km SW of Cobb, California · 14623 days ago · 0 km deep · 34 km away
  45. 2.05 km WSW of Cobb, California · 14623 days ago · -1 km deep · 35 km away
  46. 2.0Northern California · 14622 days ago · 3 km deep · 37 km away
  47. 2.04 km WNW of Cobb, California · 14622 days ago · 2 km deep · 36 km away
  48. 1.73 km WNW of Nice, California · 14621 days ago · 4 km deep · 63 km away
  49. 1.75 km ESE of Talmage, California · 14621 days ago · 10 km deep · 77 km away
  50. 1.85 km WSW of Cobb, California · 14621 days ago · 0 km deep · 34 km away
  51. 1.68 km W of Cobb, California · 14621 days ago · 2 km deep · 39 km away
  52. 1.52 km NE of Ukiah, California · 14621 days ago · 16 km deep · 85 km away
  53. 1.67 km WSW of Cobb, California · 14620 days ago · 1 km deep · 37 km away
  54. 1.61 km W of Concord, California · 14620 days ago · 21 km deep · 86 km away
  55. 2.18 km NE of Lucerne, California · 14620 days ago · 1 km deep · 56 km away
  56. 1.58 km WSW of Cobb, California · 14619 days ago · 3 km deep · 37 km away
  57. 3.08 km WSW of Cobb, California · 14618 days ago · 4 km deep · 37 km away
  58. 1.87 km WSW of Cobb, California · 14618 days ago · 3 km deep · 36 km away
  59. 2.26 km W of Cobb, California · 14618 days ago · 2 km deep · 37 km away
  60. 2.55 km S of Boonville, California · 14617 days ago · 1 km deep · 89 km away

The first 60 of 155.

Before

  1. 1.55 km SW of Cobb, California · 14636 days ago · 0 km deep · 34 km away
  2. 1.96 km WSW of Cobb, California · 14637 days ago · 0 km deep · 36 km away
  3. 2.56 km W of Cobb, California · 14637 days ago · 3 km deep · 37 km away
  4. 1.66 km WSW of Cobb, California · 14638 days ago · 1 km deep · 36 km away
  5. 1.75 km WSW of Cobb, California · 14638 days ago · 0 km deep · 35 km away
  6. 2.05 km WSW of Cobb, California · 14638 days ago · 0 km deep · 35 km away
  7. 1.710 km W of Cobb, California · 14638 days ago · -1 km deep · 40 km away
  8. 1.88 km W of Cobb, California · 14638 days ago · 2 km deep · 38 km away
  9. 2.08 km ESE of Hopland, California · 14638 days ago · 3 km deep · 61 km away
  10. 1.79 km NNE of Larkfield-Wikiup, California · 14638 days ago · 4 km deep · 29 km away
  11. 2.12 km NNW of Larkfield-Wikiup, California · 14638 days ago · 8 km deep · 36 km away
  12. 1.84 km SW of Glen Ellen, California · 14639 days ago · 5 km deep · 44 km away
  13. 1.96 km W of Cobb, California · 14639 days ago · 1 km deep · 38 km away
  14. 1.76 km SW of Cobb, California · 14639 days ago · 0 km deep · 34 km away
  15. 1.64 km SW of Cobb, California · 14639 days ago · -1 km deep · 32 km away
  16. 3.21 km NNE of Thornton, California · 14639 days ago · 5 km deep · 100 km away
  17. 2.05 km WSW of Cobb, California · 14639 days ago · -1 km deep · 36 km away
  18. 1.64 km W of Cobb, California · 14640 days ago · 1 km deep · 35 km away
  19. 1.67 km W of Cobb, California · 14640 days ago · 3 km deep · 38 km away
  20. 2.07 km W of Cobb, California · 14640 days ago · 1 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc80935. Read Sun, Sep 27, 2026, 3:20 AM UTC.