California earthquakes

M1.8 earthquake 7 km NE of Ridgemark, California

A magnitude 1.8 earthquake struck 7 km NE of Ridgemark, California on Wed, Aug 6, 1986, 12:37 AM PDT (07:37 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M4.0 16 km E of Seven Trees, California. This one was a foreshock.

Ridgemark 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), micro
Local time
UTC
1986-08-06 07:37:26 UTC
Depth
4.1 km (2.5 mi), shallow
Epicenter
36.855° N, 121.306° 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
±0.23
Depth from
From location
Station coverage gap
59°
Stations used
36

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 166 in the 60 days after this one and 169 in the 30 days before it.

After

  1. 2.35 km SE of Tres Pinos, California · 14664 days ago · 8 km deep · 11 km away
  2. 1.75 km SE of Tres Pinos, California · 14664 days ago · 8 km deep · 11 km away
  3. 2.923 km NE of King City, California · 14664 days ago · 4 km deep · 67 km away
  4. 1.58 km ESE of East Foothills, California · 14664 days ago · 6 km deep · 67 km away
  5. 2.68 km ESE of East Foothills, California · 14664 days ago · 6 km deep · 67 km away
  6. 1.524 km ENE of Soledad, California · 14664 days ago · 4 km deep · 45 km away
  7. 3.215 km SSE of Tres Pinos, California · 14663 days ago · 6 km deep · 22 km away
  8. 1.616 km SSE of Tres Pinos, California · 14663 days ago · 6 km deep · 23 km away
  9. 1.815 km SSE of Tres Pinos, California · 14663 days ago · 6 km deep · 23 km away
  10. 1.615 km SSE of Tres Pinos, California · 14663 days ago · 6 km deep · 23 km away
  11. 1.825 km NE of Greenfield, California · 14663 days ago · 0 km deep · 52 km away
  12. 2.411 km NNE of East Foothills, California · 14663 days ago · 3 km deep · 78 km away
  13. 2.66 km NE of Ridgemark, California · 14663 days ago · 5 km deep · 1 km away
  14. 1.65 km NE of Tres Pinos, California · 14663 days ago · 9 km deep · 5 km away
  15. 1.95 km SW of Gonzales, California · 14663 days ago · 10 km deep · 45 km away
  16. 2.722 km NNE of Soledad, California · 14663 days ago · 7 km deep · 29 km away
  17. 1.64 km SW of Gonzales, California · 14662 days ago · 10 km deep · 45 km away
  18. 1.624 km ENE of Greenfield, California · 14662 days ago · 2 km deep · 53 km away
  19. 1.65 km SE of Tres Pinos, California · 14662 days ago · 8 km deep · 11 km away
  20. 1.95 km WSW of Gilroy, California · 14661 days ago · 4 km deep · 32 km away
  21. 1.815 km SSE of Tres Pinos, California · 14661 days ago · 7 km deep · 22 km away
  22. 1.919 km SSE of Livermore, California · 14661 days ago · 7 km deep · 81 km away
  23. 2.46 km NE of Ridgemark, California · 14661 days ago · 4 km deep · 1 km away
  24. 2.03 km NE of Tres Pinos, California · 14661 days ago · 8 km deep · 5 km away
  25. 1.75 km SE of Tres Pinos, California · 14660 days ago · 8 km deep · 11 km away
  26. 1.815 km SSE of Livermore, California · 14660 days ago · 4 km deep · 86 km away
  27. 2.16 km SSE of Tres Pinos, California · 14660 days ago · 12 km deep · 14 km away
  28. 1.69 km NNE of Milpitas, California · 14660 days ago · 8 km deep · 86 km away
  29. 2.021 km NE of Soledad, California · 14660 days ago · 7 km deep · 36 km away
  30. 1.5Northern California · 14659 days ago · 6 km deep · 80 km away
  31. 1.712 km ENE of East Foothills, California · 14659 days ago · 7 km deep · 72 km away
  32. 1.518 km NE of East Foothills, California · 14659 days ago · 7 km deep · 80 km away
  33. 1.614 km SE of Livermore, California · 14658 days ago · 3 km deep · 86 km away
  34. 1.89 km ESE of East Foothills, California · 14658 days ago · 7 km deep · 66 km away
  35. 1.79 km ESE of East Foothills, California · 14658 days ago · 7 km deep · 66 km away
  36. 2.49 km ESE of East Foothills, California · 14658 days ago · 7 km deep · 66 km away
  37. 2.69 km ESE of East Foothills, California · 14658 days ago · 7 km deep · 66 km away
  38. 1.69 km ESE of East Foothills, California · 14658 days ago · 7 km deep · 66 km away
  39. 1.79 km S of Carmel-by-the-Sea, California · 14658 days ago · 8 km deep · 69 km away
  40. 1.822 km S of Big Sur, California · 14658 days ago · 18 km deep · 100 km away
  41. 2.121 km NE of Soledad, California · 14658 days ago · 6 km deep · 37 km away
  42. 1.85 km SE of Tres Pinos, California · 14658 days ago · 8 km deep · 11 km away
  43. 2.312 km ESE of East Foothills, California · 14657 days ago · 7 km deep · 63 km away
  44. 1.912 km ESE of East Foothills, California · 14657 days ago · 6 km deep · 63 km away
  45. 2.013 km SW of South Dos Palos, California · 14657 days ago · 4 km deep · 47 km away
  46. 1.613 km N of Morgan Hill, California · 14656 days ago · 5 km deep · 52 km away
  47. 2.822 km NNE of Soledad, California · 14656 days ago · 7 km deep · 30 km away
  48. 2.722 km NNE of Soledad, California · 14656 days ago · 6 km deep · 30 km away
  49. 1.622 km NNE of Soledad, California · 14656 days ago · 5 km deep · 30 km away
  50. 1.718 km NE of East Foothills, California · 14656 days ago · 6 km deep · 80 km away
  51. 2.321 km NE of Soledad, California · 14655 days ago · 4 km deep · 33 km away
  52. 1.923 km NE of San Lucas, California · 14655 days ago · 7 km deep · 80 km away
  53. 3.123 km NE of San Lucas, California · 14655 days ago · 6 km deep · 80 km away
  54. 2.022 km NE of San Lucas, California · 14655 days ago · 6 km deep · 80 km away
  55. 1.66 km SE of Sunol, California · 14655 days ago · 8 km deep · 91 km away
  56. 1.66 km SE of Sunol, California · 14654 days ago · 8 km deep · 91 km away
  57. 2.511 km ENE of East Foothills, California · 14654 days ago · 7 km deep · 72 km away
  58. 1.913 km ENE of East Foothills, California · 14654 days ago · 8 km deep · 74 km away
  59. 1.730 km ENE of Soledad, California · 14653 days ago · 8 km deep · 41 km away
  60. 2.021 km NE of Soledad, California · 14652 days ago · 6 km deep · 34 km away

The first 60 of 166.

Before

  1. 1.518 km NE of East Foothills, California · 14664 days ago · 6 km deep · 80 km away
  2. 2.622 km NNE of Soledad, California · 14664 days ago · 7 km deep · 30 km away
  3. 2.46 km NNE of Tres Pinos, California · 14664 days ago · 7 km deep · 2 km away
  4. 2.615 km SSE of Tres Pinos, California · 14665 days ago · 7 km deep · 22 km away
  5. 1.818 km S of Big Sur, California · 14665 days ago · 16 km deep · 95 km away
  6. 2.17 km S of Davenport, California · 14665 days ago · 6 km deep · 79 km away
  7. 1.75 km SE of Tres Pinos, California · 14666 days ago · 8 km deep · 11 km away
  8. 1.518 km NE of East Foothills, California · 14666 days ago · 6 km deep · 80 km away
  9. 2.3Central California · 14666 days ago · 7 km deep · 23 km away
  10. 2.615 km SSE of Tres Pinos, California · 14666 days ago · 7 km deep · 22 km away
  11. 2.56 km NE of East Foothills, California · 14666 days ago · 9 km deep · 76 km away
  12. 3.46 km NE of East Foothills, California · 14666 days ago · 9 km deep · 76 km away
  13. 1.524 km ENE of Greenfield, California · 14667 days ago · 4 km deep · 53 km away
  14. 2.124 km NE of Greenfield, California · 14667 days ago · 0 km deep · 52 km away
  15. 2.422 km NNE of Soledad, California · 14667 days ago · 6 km deep · 30 km away
  16. 1.919 km NE of East Foothills, California · 14667 days ago · 6 km deep · 81 km away
  17. 1.66 km WSW of Gilroy, California · 14667 days ago · 4 km deep · 33 km away
  18. 2.322 km NNE of Soledad, California · 14667 days ago · 6 km deep · 30 km away
  19. 2.022 km NNE of Soledad, California · 14667 days ago · 5 km deep · 30 km away
  20. 1.622 km NNE of Soledad, California · 14667 days ago · 6 km deep · 30 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc85267. Read Tue, Sep 29, 2026, 2:32 PM UTC.