California earthquakes

M1.6 earthquake 8 km NE of Ridgemark, California

A magnitude 1.6 earthquake struck 8 km NE of Ridgemark, California on Mon, Sep 29, 1986, 9:58 PM PDT (04:58 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.6 9 km NE of Morgan Hill, 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
1.6 (md), micro
Local time
UTC
1986-09-30 04:58:04 UTC
Depth
7.0 km (4.4 mi), shallow
Epicenter
36.861° N, 121.298° 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
±0.13
Depth from
From location
Station coverage gap
96°
Stations used
48

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 161 in the 60 days after this one and 89 in the 30 days before it.

After

  1. 1.717 km NE of East Foothills, California · 14609 days ago · 9 km deep · 76 km away
  2. 1.823 km SE of Tres Pinos, California · 14609 days ago · 7 km deep · 30 km away
  3. 1.621 km NE of Soledad, California · 14609 days ago · 8 km deep · 38 km away
  4. 1.514 km W of Westley, California · 14608 days ago · 3 km deep · 76 km away
  5. 2.318 km NE of East Foothills, California · 14607 days ago · 6 km deep · 80 km away
  6. 1.818 km NE of East Foothills, California · 14607 days ago · 6 km deep · 80 km away
  7. 2.49 km NNE of Hollister, California · 14607 days ago · 7 km deep · 8 km away
  8. 2.627 km NE of Greenfield, California · 14607 days ago · 7 km deep · 50 km away
  9. 1.721 km NE of Soledad, California · 14607 days ago · 5 km deep · 38 km away
  10. 2.47 km E of East Foothills, California · 14606 days ago · 5 km deep · 69 km away
  11. 1.826 km NE of Greenfield, California · 14605 days ago · 7 km deep · 51 km away
  12. 2.023 km NE of San Lucas, California · 14604 days ago · 7 km deep · 80 km away
  13. 2.47 km E of East Foothills, California · 14604 days ago · 6 km deep · 69 km away
  14. 2.324 km NE of King City, California · 14604 days ago · 1 km deep · 63 km away
  15. 1.625 km ENE of Greenfield, California · 14604 days ago · 1 km deep · 53 km away
  16. 3.44 km E of Interlaken, California · 14604 days ago · 6 km deep · 36 km away
  17. 1.714 km NE of East Foothills, California · 14603 days ago · 9 km deep · 74 km away
  18. 1.79 km NNE of Milpitas, California · 14603 days ago · 8 km deep · 87 km away
  19. 1.85 km S of Castroville, California · 14602 days ago · 5 km deep · 44 km away
  20. 1.822 km NE of Soledad, California · 14602 days ago · 8 km deep · 38 km away
  21. 1.827 km SE of Tres Pinos, California · 14601 days ago · 13 km deep · 32 km away
  22. 3.015 km E of Seven Trees, California · 14600 days ago · 4 km deep · 58 km away
  23. 2.414 km N of Morgan Hill, California · 14600 days ago · 5 km deep · 54 km away
  24. 2.517 km NE of East Foothills, California · 14600 days ago · 8 km deep · 80 km away
  25. 2.05 km NNE of Tres Pinos, California · 14600 days ago · 7 km deep · 3 km away
  26. 1.518 km NE of East Foothills, California · 14600 days ago · 6 km deep · 80 km away
  27. 1.69 km ESE of East Foothills, California · 14600 days ago · 5 km deep · 66 km away
  28. 1.86 km NE of East Foothills, California · 14599 days ago · 4 km deep · 75 km away
  29. 2.05 km SE of Tres Pinos, California · 14598 days ago · 6 km deep · 12 km away
  30. 2.021 km NE of Soledad, California · 14598 days ago · 5 km deep · 33 km away
  31. 2.129 km WSW of Three Rocks, California · 14598 days ago · 13 km deep · 77 km away
  32. 1.814 km E of Seven Trees, California · 14597 days ago · 2 km deep · 59 km away
  33. 2.221 km NE of Soledad, California · 14597 days ago · 2 km deep · 35 km away
  34. 1.613 km ENE of East Foothills, California · 14597 days ago · 8 km deep · 74 km away
  35. 1.616 km NE of East Foothills, California · 14597 days ago · 3 km deep · 75 km away
  36. 1.624 km NE of Greenfield, California · 14597 days ago · 5 km deep · 50 km away
  37. 2.524 km NE of Greenfield, California · 14597 days ago · 5 km deep · 50 km away
  38. 2.224 km NE of Greenfield, California · 14597 days ago · 5 km deep · 49 km away
  39. 1.524 km NE of Greenfield, California · 14596 days ago · 5 km deep · 49 km away
  40. 2.221 km NE of Soledad, California · 14595 days ago · 6 km deep · 37 km away
  41. 2.36 km ENE of Hollister, California · 14595 days ago · 7 km deep · 5 km away
  42. 2.724 km NE of Greenfield, California · 14595 days ago · 2 km deep · 48 km away
  43. 2.110 km SE of Seven Trees, California · 14595 days ago · 7 km deep · 57 km away
  44. 2.3Central California · 14595 days ago · 4 km deep · 13 km away
  45. 1.821 km NE of Soledad, California · 14595 days ago · 2 km deep · 37 km away
  46. 1.85 km ENE of Hollister, California · 14594 days ago · 6 km deep · 5 km away
  47. 2.65 km NE of Hollister, California · 14594 days ago · 7 km deep · 5 km away
  48. 2.05 km WSW of Salinas, California · 14594 days ago · 5 km deep · 43 km away
  49. 1.618 km NE of East Foothills, California · 14594 days ago · 6 km deep · 80 km away
  50. 1.627 km NE of San Ardo, California · 14593 days ago · 5 km deep · 92 km away
  51. 1.74 km SSE of San Juan Bautista, California · 14593 days ago · 4 km deep · 21 km away
  52. 1.86 km NE of Hollister, California · 14592 days ago · 7 km deep · 5 km away
  53. 1.86 km NE of Hollister, California · 14592 days ago · 6 km deep · 5 km away
  54. 1.622 km NE of Soledad, California · 14592 days ago · 5 km deep · 38 km away
  55. 2.86 km ENE of Hollister, California · 14592 days ago · 6 km deep · 5 km away
  56. 1.56 km ENE of Hollister, California · 14592 days ago · 6 km deep · 5 km away
  57. 2.56 km ENE of Hollister, California · 14592 days ago · 6 km deep · 5 km away
  58. 1.55 km NE of Hollister, California · 14592 days ago · 6 km deep · 5 km away
  59. 2.56 km ENE of Hollister, California · 14592 days ago · 7 km deep · 5 km away
  60. 1.518 km NE of East Foothills, California · 14592 days ago · 7 km deep · 80 km away

The first 60 of 161.

Before

  1. 3.116 km SW of South Dos Palos, California · 14610 days ago · 4 km deep · 47 km away
  2. 2.42 km W of Tres Pinos, California · 14610 days ago · 4 km deep · 9 km away
  3. 2.0Northern California · 14610 days ago · 8 km deep · 75 km away
  4. 1.82 km W of Tres Pinos, California · 14611 days ago · 2 km deep · 9 km away
  5. 2.8Central California · 14611 days ago · 3 km deep · 9 km away
  6. 1.59 km NNE of Morgan Hill, California · 14611 days ago · 3 km deep · 46 km away
  7. 2.48 km ENE of Morgan Hill, California · 14611 days ago · 2 km deep · 41 km away
  8. 2.023 km ENE of San Ardo, California · 14611 days ago · 6 km deep · 98 km away
  9. 1.623 km NE of King City, California · 14612 days ago · 6 km deep · 65 km away
  10. 2.420 km SSE of Tres Pinos, California · 14612 days ago · 5 km deep · 28 km away
  11. 1.815 km WNW of Three Rocks, California · 14612 days ago · 14 km deep · 75 km away
  12. 1.621 km NE of Soledad, California · 14613 days ago · 8 km deep · 38 km away
  13. 2.424 km ENE of Soledad, California · 14613 days ago · 2 km deep · 46 km away
  14. 1.73 km ESE of Tres Pinos, California · 14614 days ago · 9 km deep · 9 km away
  15. 2.39 km NNE of Hollister, California · 14615 days ago · 6 km deep · 9 km away
  16. 1.819 km SSE of Tres Pinos, California · 14616 days ago · 4 km deep · 26 km away
  17. 1.918 km S of Big Sur, California · 14616 days ago · 17 km deep · 96 km away
  18. 1.624 km NE of Greenfield, California · 14616 days ago · 5 km deep · 49 km away
  19. 1.89 km ESE of East Foothills, California · 14616 days ago · 7 km deep · 67 km away
  20. 3.29 km ESE of East Foothills, California · 14616 days ago · 7 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc84161. Read Tue, Sep 29, 2026, 11:59 AM UTC.