California earthquakes

M1.8 earthquake 8 km SW of Ridgemark, California

A magnitude 1.8 earthquake struck 8 km SW of Ridgemark, California on Tue, Sep 9, 1986, 4:19 PM PDT (23:19 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M3.7 24 km S of Big Sur, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1986-09-09 23:19:47 UTC
Depth
7.3 km (4.5 mi), shallow
Epicenter
36.747° N, 121.423° 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 0.3 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
64°
Stations used
25

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 167 in the 60 days after this one and 111 in the 30 days before it.

After

  1. 1.86 km ENE of Hollister, California · 14630 days ago · 6 km deep · 16 km away
  2. 1.515 km E of Seven Trees, California · 14630 days ago · 4 km deep · 63 km away
  3. 2.421 km NE of Soledad, California · 14630 days ago · 6 km deep · 32 km away
  4. 1.616 km SSE of Tres Pinos, California · 14630 days ago · 3 km deep · 18 km away
  5. 1.75 km ENE of Hollister, California · 14630 days ago · 6 km deep · 16 km away
  6. 1.910 km NNE of East Foothills, California · 14629 days ago · 7 km deep · 85 km away
  7. 1.55 km ENE of Hollister, California · 14628 days ago · 6 km deep · 16 km away
  8. 1.824 km ENE of Greenfield, California · 14628 days ago · 5 km deep · 54 km away
  9. 1.95 km ENE of Hollister, California · 14628 days ago · 6 km deep · 16 km away
  10. 2.214 km SSE of Tres Pinos, California · 14627 days ago · 4 km deep · 16 km away
  11. 1.55 km ENE of Hollister, California · 14627 days ago · 6 km deep · 16 km away
  12. 1.75 km SSW of Ridgemark, California · 14627 days ago · 5 km deep · 4 km away
  13. 2.35 km ENE of Hollister, California · 14627 days ago · 6 km deep · 16 km away
  14. 2.25 km ENE of Hollister, California · 14627 days ago · 6 km deep · 16 km away
  15. 1.85 km ENE of Hollister, California · 14627 days ago · 6 km deep · 16 km away
  16. 3.45 km ENE of Hollister, California · 14627 days ago · 7 km deep · 16 km away
  17. 2.14 km W of San Juan Bautista, California · 14627 days ago · 8 km deep · 19 km away
  18. 1.54 km ENE of Tres Pinos, California · 14626 days ago · 8 km deep · 15 km away
  19. 1.615 km NW of Diablo Grande, California · 14626 days ago · 5 km deep · 83 km away
  20. 1.821 km S of Big Sur, California · 14626 days ago · 18 km deep · 83 km away
  21. 1.921 km NE of Soledad, California · 14625 days ago · 5 km deep · 30 km away
  22. 3.114 km E of Seven Trees, California · 14625 days ago · 4 km deep · 64 km away
  23. 2.26 km WSW of Gilroy, California · 14624 days ago · 6 km deep · 32 km away
  24. 1.818 km NE of East Foothills, California · 14624 days ago · 5 km deep · 88 km away
  25. 1.824 km ENE of Soledad, California · 14624 days ago · 3 km deep · 42 km away
  26. 1.79 km ENE of Milpitas, California · 14623 days ago · 7 km deep · 88 km away
  27. 1.95 km ENE of Hollister, California · 14623 days ago · 6 km deep · 16 km away
  28. 1.821 km NE of Soledad, California · 14623 days ago · 7 km deep · 28 km away
  29. 2.09 km NNE of Hollister, California · 14622 days ago · 7 km deep · 21 km away
  30. 2.17 km SSE of San Juan Bautista, California · 14622 days ago · 8 km deep · 9 km away
  31. 2.422 km NNE of Soledad, California · 14621 days ago · 6 km deep · 26 km away
  32. 2.422 km NNE of Soledad, California · 14621 days ago · 6 km deep · 26 km away
  33. 2.312 km W of Westley, California · 14621 days ago · 5 km deep · 89 km away
  34. 1.78 km ENE of San Martin, California · 14621 days ago · 5 km deep · 41 km away
  35. 2.619 km SSE of Livermore, California · 14619 days ago · 7 km deep · 89 km away
  36. 1.612 km ENE of East Foothills, California · 14618 days ago · 7 km deep · 80 km away
  37. 3.216 km SSE of Tres Pinos, California · 14618 days ago · 3 km deep · 18 km away
  38. 3.016 km SSE of Tres Pinos, California · 14618 days ago · 3 km deep · 18 km away
  39. 3.29 km ESE of East Foothills, California · 14618 days ago · 7 km deep · 72 km away
  40. 1.89 km ESE of East Foothills, California · 14618 days ago · 7 km deep · 73 km away
  41. 1.624 km NE of Greenfield, California · 14617 days ago · 5 km deep · 46 km away
  42. 3.724 km S of Big Sur, California · 14617 days ago · 14 km deep · 87 km away
  43. 2.422 km S of Big Sur, California · 14617 days ago · 18 km deep · 84 km away
  44. 1.918 km S of Big Sur, California · 14617 days ago · 17 km deep · 80 km away
  45. 1.819 km SSE of Tres Pinos, California · 14617 days ago · 4 km deep · 21 km away
  46. 1.822 km S of Big Sur, California · 14616 days ago · 18 km deep · 85 km away
  47. 2.39 km NNE of Hollister, California · 14616 days ago · 6 km deep · 21 km away
  48. 1.73 km ESE of Tres Pinos, California · 14616 days ago · 9 km deep · 13 km away
  49. 2.424 km ENE of Soledad, California · 14614 days ago · 2 km deep · 43 km away
  50. 1.621 km NE of Soledad, California · 14614 days ago · 8 km deep · 34 km away
  51. 1.815 km WNW of Three Rocks, California · 14614 days ago · 14 km deep · 81 km away
  52. 2.420 km SSE of Tres Pinos, California · 14614 days ago · 5 km deep · 23 km away
  53. 1.623 km NE of King City, California · 14613 days ago · 6 km deep · 62 km away
  54. 2.023 km ENE of San Ardo, California · 14613 days ago · 6 km deep · 95 km away
  55. 2.48 km ENE of Morgan Hill, California · 14613 days ago · 2 km deep · 47 km away
  56. 1.59 km NNE of Morgan Hill, California · 14613 days ago · 3 km deep · 53 km away
  57. 2.8Central California · 14612 days ago · 3 km deep · 8 km away
  58. 1.82 km W of Tres Pinos, California · 14612 days ago · 2 km deep · 8 km away
  59. 2.0Northern California · 14612 days ago · 8 km deep · 82 km away
  60. 2.42 km W of Tres Pinos, California · 14612 days ago · 4 km deep · 8 km away

The first 60 of 167.

Before

  1. 1.814 km SSE of Tres Pinos, California · 14631 days ago · 4 km deep · 16 km away
  2. 1.820 km SSE of Tres Pinos, California · 14632 days ago · 4 km deep · 23 km away
  3. 1.615 km E of Seven Trees, California · 14632 days ago · 6 km deep · 64 km away
  4. 1.64 km ESE of Tres Pinos, California · 14632 days ago · 7 km deep · 13 km away
  5. 2.91 km SSW of Hollister, California · 14633 days ago · 6 km deep · 10 km away
  6. 2.68 km ENE of Tres Pinos, California · 14633 days ago · 8 km deep · 19 km away
  7. 1.9Central California · 14633 days ago · 2 km deep · 48 km away
  8. 2.419 km SSE of Livermore, California · 14633 days ago · 7 km deep · 89 km away
  9. 1.713 km SE of Livermore, California · 14633 days ago · 4 km deep · 95 km away
  10. 2.222 km ENE of Soledad, California · 14633 days ago · 10 km deep · 38 km away
  11. 1.620 km NW of Coalinga, California · 14633 days ago · 6 km deep · 97 km away
  12. 1.82 km SSW of Hollister, California · 14634 days ago · 8 km deep · 10 km away
  13. 2.321 km NE of Soledad, California · 14634 days ago · 6 km deep · 28 km away
  14. 1.92 km SSW of Hollister, California · 14634 days ago · 8 km deep · 10 km away
  15. 1.79 km ENE of Morgan Hill, California · 14636 days ago · 5 km deep · 47 km away
  16. 1.717 km NE of East Foothills, California · 14637 days ago · 6 km deep · 88 km away
  17. 2.422 km NNE of Soledad, California · 14637 days ago · 6 km deep · 25 km away
  18. 1.516 km E of Seven Trees, California · 14637 days ago · 8 km deep · 63 km away
  19. 2.04 km NNE of Tres Pinos, California · 14637 days ago · 5 km deep · 15 km away
  20. 1.93 km WSW of Moss Landing, California · 14638 days ago · 5 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc81862. Read Thu, Oct 1, 2026, 4:39 AM UTC.