California earthquakes

M1.9 earthquake 7 km NE of Ridgemark, California

A magnitude 1.9 earthquake struck 7 km NE of Ridgemark, California on Sat, May 31, 1986, 7:45 PM PDT (02:45 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.6 Central 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
1986-06-01 02:45:35 UTC
Depth
5.9 km (3.7 mi), shallow
Epicenter
36.864° N, 121.308° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.21
Depth from
From location
Station coverage gap
63°
Stations used
42

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 178 in the 60 days after this one and 180 in the 30 days before it.

After

  1. 2.018 km SSE of Tres Pinos, California · 14731 days ago · 6 km deep · 26 km away
  2. 1.919 km SSE of Tres Pinos, California · 14731 days ago · 7 km deep · 27 km away
  3. 3.6Central California · 14731 days ago · 5 km deep · 27 km away
  4. 3.519 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 27 km away
  5. 2.620 km SSE of Tres Pinos, California · 14731 days ago · 4 km deep · 28 km away
  6. 2.220 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 28 km away
  7. 1.85 km ENE of Interlaken, California · 14731 days ago · 11 km deep · 35 km away
  8. 1.69 km NNE of East Foothills, California · 14731 days ago · 5 km deep · 79 km away
  9. 2.220 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 28 km away
  10. 1.713 km ENE of East Foothills, California · 14731 days ago · 7 km deep · 72 km away
  11. 2.118 km SSE of Tres Pinos, California · 14731 days ago · 4 km deep · 26 km away
  12. 2.420 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 28 km away
  13. 2.917 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 25 km away
  14. 1.618 km NE of East Foothills, California · 14730 days ago · 6 km deep · 79 km away
  15. 1.917 km SSE of Tres Pinos, California · 14730 days ago · 5 km deep · 25 km away
  16. 1.623 km NE of Greenfield, California · 14730 days ago · 1 km deep · 50 km away
  17. 1.615 km E of Seven Trees, California · 14730 days ago · 5 km deep · 57 km away
  18. 2.517 km SSE of Tres Pinos, California · 14730 days ago · 5 km deep · 25 km away
  19. 2.129 km E of Tres Pinos, California · 14730 days ago · 0 km deep · 29 km away
  20. 2.917 km SSE of Tres Pinos, California · 14730 days ago · 5 km deep · 25 km away
  21. 2.017 km SSE of Tres Pinos, California · 14730 days ago · 5 km deep · 25 km away
  22. 1.516 km SSE of Tres Pinos, California · 14730 days ago · 5 km deep · 25 km away
  23. 2.315 km N of Morgan Hill, California · 14730 days ago · 7 km deep · 54 km away
  24. 3.020 km SSE of Tres Pinos, California · 14730 days ago · 6 km deep · 28 km away
  25. 1.920 km SSE of Tres Pinos, California · 14730 days ago · 6 km deep · 28 km away
  26. 1.85 km NE of Tres Pinos, California · 14730 days ago · 6 km deep · 5 km away
  27. 1.919 km SSE of Tres Pinos, California · 14730 days ago · 4 km deep · 27 km away
  28. 1.720 km SSE of Tres Pinos, California · 14730 days ago · 6 km deep · 28 km away
  29. 2.217 km NE of East Foothills, California · 14729 days ago · 5 km deep · 79 km away
  30. 1.920 km SSE of Tres Pinos, California · 14729 days ago · 5 km deep · 28 km away
  31. 3.120 km SSE of Tres Pinos, California · 14729 days ago · 6 km deep · 28 km away
  32. 2.117 km SSE of Tres Pinos, California · 14729 days ago · 6 km deep · 26 km away
  33. 2.524 km NE of Greenfield, California · 14729 days ago · 1 km deep · 51 km away
  34. 1.520 km SSE of Tres Pinos, California · 14729 days ago · 5 km deep · 28 km away
  35. 1.624 km NE of Greenfield, California · 14729 days ago · -1 km deep · 51 km away
  36. 2.015 km SSE of Tres Pinos, California · 14729 days ago · 3 km deep · 24 km away
  37. 2.821 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 28 km away
  38. 3.220 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 28 km away
  39. 2.220 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 28 km away
  40. 1.818 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 26 km away
  41. 2.320 km SSE of Tres Pinos, California · 14728 days ago · 5 km deep · 28 km away
  42. 2.221 km SSE of Tres Pinos, California · 14728 days ago · 5 km deep · 29 km away
  43. 2.03 km NNE of East Foothills, California · 14728 days ago · 2 km deep · 75 km away
  44. 1.714 km NE of East Foothills, California · 14728 days ago · 9 km deep · 74 km away
  45. 1.912 km NNE of East Foothills, California · 14728 days ago · 8 km deep · 78 km away
  46. 1.64 km SE of Tres Pinos, CA · 14728 days ago · 0 km deep · 12 km away
  47. 1.915 km SSE of Tres Pinos, California · 14728 days ago · 7 km deep · 24 km away
  48. 1.618 km SSE of Tres Pinos, California · 14728 days ago · 5 km deep · 26 km away
  49. 1.818 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 26 km away
  50. 1.819 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 27 km away
  51. 1.617 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 26 km away
  52. 2.017 km SSE of Tres Pinos, California · 14728 days ago · 6 km deep · 25 km away
  53. 1.98 km ENE of East Foothills, California · 14728 days ago · 4 km deep · 70 km away
  54. 3.111 km S of Tres Pinos, California · 14727 days ago · 4 km deep · 20 km away
  55. 2.2Central California · 14727 days ago · 4 km deep · 20 km away
  56. 1.519 km SSE of Livermore, California · 14727 days ago · 2 km deep · 81 km away
  57. 1.617 km SSE of Tres Pinos, California · 14727 days ago · 6 km deep · 25 km away
  58. 1.920 km SSE of Tres Pinos, California · 14727 days ago · 4 km deep · 28 km away
  59. 1.918 km SSE of Tres Pinos, California · 14727 days ago · 6 km deep · 26 km away
  60. 2.28 km ENE of East Foothills, California · 14727 days ago · 4 km deep · 70 km away

The first 60 of 178.

Before

  1. 2.518 km SSE of Tres Pinos, California · 14731 days ago · 6 km deep · 26 km away
  2. 1.917 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 25 km away
  3. 2.117 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 25 km away
  4. 1.917 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 25 km away
  5. 2.517 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 25 km away
  6. 1.617 km SSE of Tres Pinos, California · 14731 days ago · 5 km deep · 26 km away
  7. 2.219 km SSE of Tres Pinos, California · 14731 days ago · 6 km deep · 27 km away
  8. 2.017 km SSE of Tres Pinos, California · 14732 days ago · 5 km deep · 25 km away
  9. 1.518 km SSE of Tres Pinos, California · 14732 days ago · 5 km deep · 26 km away
  10. 3.018 km SSE of Tres Pinos, California · 14732 days ago · 5 km deep · 26 km away
  11. 1.618 km SSE of Tres Pinos, California · 14732 days ago · 6 km deep · 26 km away
  12. 1.917 km SSE of Tres Pinos, California · 14732 days ago · 4 km deep · 25 km away
  13. 1.718 km NE of East Foothills, California · 14732 days ago · 7 km deep · 79 km away
  14. 2.320 km SSE of Tres Pinos, California · 14732 days ago · 4 km deep · 28 km away
  15. 1.818 km SSE of Tres Pinos, California · 14732 days ago · 5 km deep · 26 km away
  16. 2.018 km SSE of Tres Pinos, California · 14732 days ago · 6 km deep · 27 km away
  17. 2.319 km SSE of Tres Pinos, California · 14732 days ago · 4 km deep · 27 km away
  18. 2.818 km SSE of Tres Pinos, California · 14732 days ago · 5 km deep · 26 km away
  19. 2.618 km SSE of Tres Pinos, California · 14732 days ago · 4 km deep · 26 km away
  20. 1.719 km SSE of Tres Pinos, California · 14732 days ago · 6 km deep · 27 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73750. Read Wed, Sep 30, 2026, 7:54 AM UTC.