California earthquakes

M1.9 earthquake 8 km NNE of Geyserville, California

A magnitude 1.9 earthquake struck 8 km NNE of Geyserville, California on Sat, Oct 18, 1986, 2:39 PM PDT (21:39 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.7 5 km SW of Cobb, California. This one was a foreshock.

Geyserville 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
1986-10-18 21:39:47 UTC
Depth
12.6 km (7.8 mi), shallow
Epicenter
38.774° N, 122.858° 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 0.8 km horizontally, 2.6 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
165°
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: 173 in the 60 days after this one and 69 in the 30 days before it.

After

  1. 2.67 km W of Cobb, California · 14592 days ago · 4 km deep · 7 km away
  2. 1.818 km NNE of Upper Lake, California · 14592 days ago · 0 km deep · 60 km away
  3. 2.218 km NNE of Upper Lake, California · 14592 days ago · 7 km deep · 59 km away
  4. 1.61 km WSW of Kelseyville, California · 14591 days ago · 3 km deep · 22 km away
  5. 1.611 km N of Cloverdale, California · 14591 days ago · 1 km deep · 19 km away
  6. 2.86 km W of Cobb, California · 14591 days ago · 4 km deep · 7 km away
  7. 1.96 km W of Cobb, California · 14591 days ago · 3 km deep · 7 km away
  8. 2.67 km NNE of Hopland, California · 14591 days ago · 2 km deep · 35 km away
  9. 1.99 km WSW of Cobb, California · 14590 days ago · 1 km deep · 4 km away
  10. 1.86 km W of Cobb, California · 14590 days ago · 3 km deep · 8 km away
  11. 2.35 km SW of Cobb, California · 14590 days ago · 1 km deep · 8 km away
  12. 1.98 km E of Lower Lake, California · 14590 days ago · 1 km deep · 34 km away
  13. 2.119 km ENE of Brooktrails, California · 14589 days ago · 4 km deep · 89 km away
  14. 2.19 km WSW of Cobb, California · 14589 days ago · -1 km deep · 4 km away
  15. 2.26 km WSW of Cobb, California · 14588 days ago · 3 km deep · 7 km away
  16. 1.7Northern California · 14587 days ago · 1 km deep · 10 km away
  17. 1.85 km W of Cobb, California · 14586 days ago · 2 km deep · 9 km away
  18. 2.010 km SSE of Moskowite Corner, California · 14586 days ago · 4 km deep · 77 km away
  19. 1.97 km WSW of Cobb, California · 14585 days ago · 1 km deep · 6 km away
  20. 1.67 km WSW of Cobb, California · 14585 days ago · 2 km deep · 6 km away
  21. 1.65 km WSW of Cobb, California · 14584 days ago · 0 km deep · 7 km away
  22. 2.07 km ENE of Clearlake, California · 14583 days ago · 13 km deep · 36 km away
  23. 3.15 km W of Cobb, California · 14582 days ago · 1 km deep · 8 km away
  24. 1.714 km E of Angwin, California · 14581 days ago · 5 km deep · 54 km away
  25. 2.27 km WSW of Cobb, California · 14581 days ago · 0 km deep · 6 km away
  26. 1.62 km WNW of Sea Ranch, California · 14580 days ago · 3 km deep · 54 km away
  27. 1.67 km W of Cobb, California · 14579 days ago · 6 km deep · 7 km away
  28. 1.54 km WNW of Cobb, California · 14579 days ago · -1 km deep · 11 km away
  29. 3.02 km SW of Cobb, California · 14578 days ago · 2 km deep · 11 km away
  30. 1.64 km WSW of Cobb, California · 14578 days ago · 2 km deep · 8 km away
  31. 2.08 km NNE of Brooktrails, California · 14578 days ago · 19 km deep · 93 km away
  32. 2.110 km NNW of Redwood Valley, California · 14578 days ago · 4 km deep · 73 km away
  33. 1.74 km WSW of Cobb, California · 14577 days ago · 0 km deep · 8 km away
  34. 2.06 km NW of Cobb, California · 14577 days ago · -1 km deep · 12 km away
  35. 1.64 km WSW of Clear Lake Riviera, California · 14575 days ago · 0 km deep · 20 km away
  36. 1.68 km W of Cobb, California · 14575 days ago · 1 km deep · 6 km away
  37. 2.121 km NE of Potter Valley, California · 14575 days ago · 10 km deep · 77 km away
  38. 2.16 km WSW of Cobb, California · 14575 days ago · 4 km deep · 6 km away
  39. 1.97 km WSW of Cobb, California · 14575 days ago · 1 km deep · 5 km away
  40. 1.75 km WSW of Cobb, California · 14574 days ago · 0 km deep · 7 km away
  41. 1.79 km W of Cobb, California · 14574 days ago · 1 km deep · 6 km away
  42. 2.06 km NW of Green Valley, California · 14574 days ago · 8 km deep · 77 km away
  43. 2.110 km E of Hidden Valley Lake, California · 14574 days ago · 2 km deep · 36 km away
  44. 2.610 km NW of Cazadero, California · 14574 days ago · 18 km deep · 35 km away
  45. 1.62 km SSW of Angwin, California · 14573 days ago · 13 km deep · 43 km away
  46. 1.74 km SSW of Calistoga, California · 14573 days ago · 4 km deep · 34 km away
  47. 1.68 km SW of Hopland, California · 14573 days ago · 4 km deep · 31 km away
  48. 1.96 km WNW of Montalvin, California · 14573 days ago · 31 km deep · 93 km away
  49. 2.17 km W of Cobb, California · 14573 days ago · 3 km deep · 6 km away
  50. 2.310 km N of Cloverdale, California · 14572 days ago · 22 km deep · 18 km away
  51. 2.19 km W of Cobb, California · 14571 days ago · -1 km deep · 4 km away
  52. 1.66 km W of Cobb, California · 14571 days ago · 2 km deep · 8 km away
  53. 1.79 km WNW of Cazadero, California · 14571 days ago · 4 km deep · 38 km away
  54. 2.67 km W of Cobb, California · 14570 days ago · 3 km deep · 6 km away
  55. 1.94 km W of Cobb, California · 14570 days ago · 0 km deep · 9 km away
  56. 2.811 km S of Kelseyville, California · 14570 days ago · 2 km deep · 11 km away
  57. 2.46 km WSW of Cobb, California · 14570 days ago · 1 km deep · 6 km away
  58. 2.218 km W of Cloverdale, California · 14570 days ago · 5 km deep · 32 km away
  59. 1.75 km SW of Cobb, California · 14569 days ago · 0 km deep · 7 km away
  60. 2.85 km SW of Cobb, California · 14569 days ago · 0 km deep · 8 km away

The first 60 of 173.

Before

  1. 1.810 km ENE of Hidden Valley Lake, California · 14592 days ago · 5 km deep · 36 km away
  2. 1.63 km W of Geyserville, California · 14592 days ago · 2 km deep · 10 km away
  3. 2.05 km WSW of Cobb, California · 14595 days ago · -1 km deep · 8 km away
  4. 1.77 km W of Cobb, California · 14596 days ago · 3 km deep · 6 km away
  5. 1.57 km W of Cobb, California · 14598 days ago · 2 km deep · 6 km away
  6. 1.77 km WSW of Cobb, California · 14598 days ago · 4 km deep · 5 km away
  7. 1.57 km SSW of Clear Lake Riviera, California · 14598 days ago · 4 km deep · 17 km away
  8. 2.01 km W of Sea Ranch, California · 14598 days ago · 4 km deep · 54 km away
  9. 4.04 km SW of Sea Ranch, California · 14598 days ago · 6 km deep · 56 km away
  10. 1.65 km SW of Cobb, California · 14599 days ago · 3 km deep · 8 km away
  11. 1.99 km SSW of Lodoga, California · 14600 days ago · 20 km deep · 57 km away
  12. 1.64 km W of Angwin, California · 14600 days ago · 4 km deep · 38 km away
  13. 1.714 km NE of Willits, California · 14600 days ago · 4 km deep · 85 km away
  14. 2.05 km SW of Cobb, California · 14602 days ago · 1 km deep · 8 km away
  15. 1.67 km W of Cobb, California · 14602 days ago · 3 km deep · 6 km away
  16. 1.86 km W of Cobb, California · 14603 days ago · 3 km deep · 8 km away
  17. 1.6Northern California · 14603 days ago · 0 km deep · 8 km away
  18. 1.813 km S of Comptche, California · 14603 days ago · 2 km deep · 75 km away
  19. 2.110 km N of Cloverdale, California · 14604 days ago · 4 km deep · 20 km away
  20. 1.77 km WSW of Cobb, California · 14604 days ago · 3 km deep · 5 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1144621. Read Wed, Sep 30, 2026, 3:37 PM UTC.