California earthquakes

M1.9 earthquake 6 km NE of Ridgemark, California

A magnitude 1.9 earthquake struck 6 km NE of Ridgemark, California on Thu, Feb 20, 1986, 11:16 PM PST (07:16 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M5.7 15 km NE of East Foothills, 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
1.9 (md), micro
Local time
UTC
1986-02-21 07:16:53 UTC
Depth
1.8 km (1.1 mi), shallow
Epicenter
36.860° N, 121.315° 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
±0.18
Depth from
From location
Station coverage gap
43°
Stations used
41

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 189 in the 30 days before it.

After

  1. 1.715 km N of Morgan Hill, California · 14830 days ago · 6 km deep · 55 km away
  2. 2.0Central California · 14830 days ago · 0 km deep · 6 km away
  3. 1.63 km ENE of Tres Pinos, California · 14829 days ago · 9 km deep · 7 km away
  4. 1.86 km NNE of Tres Pinos, California · 14829 days ago · 6 km deep · 3 km away
  5. 1.723 km NE of San Ardo, California · 14829 days ago · 7 km deep · 89 km away
  6. 2.18 km NE of East Foothills, California · 14828 days ago · 6 km deep · 75 km away
  7. 1.55 km NNE of Tres Pinos, California · 14828 days ago · 6 km deep · 4 km away
  8. 1.85 km ESE of Carmel-by-the-Sea, California · 14828 days ago · 17 km deep · 60 km away
  9. 2.18 km ENE of Morgan Hill, California · 14827 days ago · 4 km deep · 41 km away
  10. 2.421 km NE of Soledad, California · 14827 days ago · 6 km deep · 36 km away
  11. 1.621 km NE of Soledad, California · 14827 days ago · 6 km deep · 36 km away
  12. 1.714 km E of Seven Trees, California · 14827 days ago · 2 km deep · 58 km away
  13. 1.612 km ESE of East Foothills, California · 14827 days ago · 7 km deep · 62 km away
  14. 1.614 km E of Seven Trees, California · 14827 days ago · 1 km deep · 58 km away
  15. 2.114 km E of Seven Trees, California · 14826 days ago · 1 km deep · 57 km away
  16. 1.74 km NE of Tres Pinos, California · 14826 days ago · 6 km deep · 5 km away
  17. 1.83 km ENE of Tres Pinos, California · 14826 days ago · 8 km deep · 7 km away
  18. 3.030 km SSW of South Dos Palos, California · 14825 days ago · 0 km deep · 49 km away
  19. 2.48 km WSW of San Ardo, California · 14825 days ago · 8 km deep · 100 km away
  20. 1.715 km SSE of Pescadero, California · 14824 days ago · 5 km deep · 95 km away
  21. 2.13 km ESE of Tres Pinos, California · 14824 days ago · 4 km deep · 9 km away
  22. 1.82 km WSW of Corralitos, California · 14824 days ago · 13 km deep · 48 km away
  23. 1.52 km WSW of Corralitos, California · 14824 days ago · 13 km deep · 48 km away
  24. 1.72 km WSW of Corralitos, California · 14823 days ago · 13 km deep · 48 km away
  25. 2.3Central California · 14823 days ago · 6 km deep · 5 km away
  26. 1.76 km SW of Gilroy, California · 14822 days ago · 5 km deep · 30 km away
  27. 2.06 km NE of San Martin, California · 14822 days ago · 3 km deep · 36 km away
  28. 1.827 km SSW of South Dos Palos, California · 14822 days ago · 0 km deep · 53 km away
  29. 2.58 km SE of La Honda, California · 14822 days ago · 7 km deep · 91 km away
  30. 2.66 km NE of Ridgemark, California · 14822 days ago · 6 km deep · 1 km away
  31. 1.76 km NE of Ridgemark, California · 14822 days ago · 6 km deep · 1 km away
  32. 1.63 km ESE of Tres Pinos, California · 14821 days ago · 8 km deep · 10 km away
  33. 1.63 km ESE of Tres Pinos, California · 14821 days ago · 8 km deep · 10 km away
  34. 1.73 km ESE of Tres Pinos, California · 14821 days ago · 8 km deep · 10 km away
  35. 2.36 km NE of Ridgemark, California · 14821 days ago · 6 km deep · 1 km away
  36. 1.717 km WNW of Three Rocks, California · 14820 days ago · 4 km deep · 74 km away
  37. 3.25 km NE of Tres Pinos, California · 14820 days ago · 8 km deep · 4 km away
  38. 1.61 km E of Tres Pinos, California · 14820 days ago · 8 km deep · 8 km away
  39. 2.24 km ESE of Tres Pinos, California · 14819 days ago · 9 km deep · 11 km away
  40. 1.923 km ENE of Soledad, California · 14819 days ago · 3 km deep · 46 km away
  41. 2.523 km ENE of Soledad, California · 14819 days ago · 3 km deep · 46 km away
  42. 1.58 km ENE of Morgan Hill, California · 14819 days ago · 4 km deep · 41 km away
  43. 1.55 km NNE of Tres Pinos, California · 14819 days ago · 6 km deep · 3 km away
  44. 2.94 km ESE of Tres Pinos, California · 14819 days ago · 9 km deep · 11 km away
  45. 2.34 km ESE of Tres Pinos, California · 14819 days ago · 8 km deep · 11 km away
  46. 1.64 km NE of Tres Pinos, California · 14819 days ago · 8 km deep · 6 km away
  47. 2.65 km SE of Tres Pinos, California · 14818 days ago · 9 km deep · 12 km away
  48. 1.622 km NE of Soledad, California · 14817 days ago · 0 km deep · 33 km away
  49. 2.122 km NE of Soledad, California · 14817 days ago · 3 km deep · 36 km away
  50. 1.622 km NNE of Soledad, California · 14817 days ago · 1 km deep · 31 km away
  51. 2.022 km NNE of Soledad, California · 14817 days ago · 2 km deep · 31 km away
  52. 2.75 km NNE of Tres Pinos, California · 14817 days ago · 7 km deep · 3 km away
  53. 2.121 km NNE of Soledad, California · 14816 days ago · 5 km deep · 32 km away
  54. 2.221 km NE of Soledad, California · 14816 days ago · 4 km deep · 32 km away
  55. 1.714 km E of Seven Trees, California · 14816 days ago · 1 km deep · 58 km away
  56. 2.123 km ENE of San Lucas, California · 14816 days ago · 9 km deep · 83 km away
  57. 2.17 km ENE of Gilroy, California · 14816 days ago · 6 km deep · 24 km away
  58. 2.35 km NE of Tres Pinos, California · 14815 days ago · 8 km deep · 6 km away
  59. 2.18 km ENE of San Martin, California · 14815 days ago · 6 km deep · 34 km away
  60. 1.65 km NNE of Tres Pinos, California · 14815 days ago · 6 km deep · 4 km away

The first 60 of 186.

Before

  1. 2.72 km SSW of San Juan Bautista, California · 14830 days ago · 7 km deep · 21 km away
  2. 2.05 km NNE of Tres Pinos, California · 14830 days ago · 6 km deep · 3 km away
  3. 2.221 km NE of Soledad, California · 14831 days ago · 5 km deep · 34 km away
  4. 1.95 km ENE of Tres Pinos, California · 14831 days ago · 8 km deep · 8 km away
  5. 2.011 km NE of Morgan Hill, California · 14831 days ago · 5 km deep · 45 km away
  6. 1.925 km NE of King City, California · 14831 days ago · 1 km deep · 61 km away
  7. 2.45 km SE of Tres Pinos, California · 14831 days ago · 7 km deep · 12 km away
  8. 2.25 km W of Diablo Grande, California · 14831 days ago · -1 km deep · 60 km away
  9. 2.36 km NE of Ridgemark, California · 14831 days ago · 7 km deep · 2 km away
  10. 1.913 km N of Morgan Hill, California · 14831 days ago · 5 km deep · 52 km away
  11. 2.86 km NE of Ridgemark, California · 14832 days ago · 7 km deep · 2 km away
  12. 3.16 km NNE of Tres Pinos, California · 14832 days ago · 8 km deep · 2 km away
  13. 2.66 km N of Tres Pinos, California · 14832 days ago · 7 km deep · 2 km away
  14. 1.930 km ENE of Soledad, California · 14832 days ago · 8 km deep · 44 km away
  15. 2.14 km NE of Tres Pinos, California · 14832 days ago · 8 km deep · 5 km away
  16. 3.14 km NE of Tres Pinos, California · 14832 days ago · 9 km deep · 5 km away
  17. 1.60 km NNW of Tres Pinos, California · 14833 days ago · 6 km deep · 7 km away
  18. 1.65 km NNE of Tres Pinos, California · 14833 days ago · 3 km deep · 3 km away
  19. 1.95 km NE of Tres Pinos, California · 14833 days ago · 5 km deep · 4 km away
  20. 1.716 km N of Morgan Hill, California · 14833 days ago · 6 km deep · 55 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc66792. Read Tue, Sep 29, 2026, 12:43 PM UTC.