California earthquakes

M4.3 earthquake 7 km S of Three Rocks, California

A magnitude 4.3 earthquake struck 7 km S of Three Rocks, California on Thu, Aug 21, 1975, 7:19 AM PDT (14:19 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M4.8 14 km NW of Parkfield, California. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.3 (Md, duration), light
Magnitude from
Northern California Seismic System
Local time
UTC
1975-08-21 14:19:42 UTC
Depth
16.5 km (10.2 mi), shallow
Epicenter
36.438° N, 120.379° 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 0.5 km horizontally, 1.4 km in depth
Magnitude uncertainty
±0.21
Depth from
From location
Station coverage gap
132°
Stations used
28

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 123 in the 30 days before it.

After

  1. 1.920 km ESE of Tres Pinos, California · 18670 days ago · 0 km deep · 72 km away
  2. 2.421 km NE of Soledad, California · 18670 days ago · 2 km deep · 69 km away
  3. 2.921 km NE of Soledad, California · 18669 days ago · 6 km deep · 70 km away
  4. 2.525 km ENE of San Ardo, California · 18669 days ago · 8 km deep · 44 km away
  5. 2.623 km NE of King City, California · 18669 days ago · 3 km deep · 50 km away
  6. 2.228 km NE of Soledad, California · 18668 days ago · 8 km deep · 65 km away
  7. 2.521 km NE of Soledad, California · 18668 days ago · 2 km deep · 69 km away
  8. 2.2Central California · 18668 days ago · 2 km deep · 69 km away
  9. 3.2Near the coast of Central California · 18667 days ago · 8 km deep · 94 km away
  10. 1.727 km SE of Tres Pinos, California · 18667 days ago · 7 km deep · 68 km away
  11. 2.9Central California · 18667 days ago · 4 km deep · 51 km away
  12. 3.518 km NW of Parkfield, California · 18667 days ago · 5 km deep · 51 km away
  13. 3.517 km NW of Parkfield, California · 18667 days ago · 4 km deep · 52 km away
  14. 3.523 km NE of San Ardo, California · 18667 days ago · 7 km deep · 44 km away
  15. 2.3Central California · 18666 days ago · 9 km deep · 68 km away
  16. 2.523 km ENE of Soledad, California · 18666 days ago · 4 km deep · 64 km away
  17. 2.923 km ENE of Soledad, California · 18666 days ago · 4 km deep · 64 km away
  18. 3.413 km S of Tres Pinos, California · 18666 days ago · 4 km deep · 85 km away
  19. 2.424 km NE of Soledad, California · 18666 days ago · 10 km deep · 68 km away
  20. 3.523 km NE of King City, California · 18665 days ago · 8 km deep · 52 km away
  21. 2.721 km NNE of San Ardo, California · 18665 days ago · 6 km deep · 45 km away
  22. 2.822 km ENE of Soledad, California · 18665 days ago · 10 km deep · 66 km away
  23. 4.117 km SSE of Tres Pinos, California · 18664 days ago · 4 km deep · 82 km away
  24. 2.911 km SSE of Tres Pinos, California · 18664 days ago · 4 km deep · 85 km away
  25. 3.129 km ENE of Soledad, California · 18664 days ago · 6 km deep · 61 km away
  26. 2.326 km NE of Soledad, California · 18663 days ago · 7 km deep · 69 km away
  27. 2.222 km NE of San Lucas, California · 18663 days ago · 7 km deep · 45 km away
  28. 3.93 km SW of Three Rocks, California · 18663 days ago · 13 km deep · 5 km away
  29. 3.72 km S of Three Rocks, California · 18663 days ago · 4 km deep · 5 km away
  30. 4.83 km SSW of Three Rocks, California · 18663 days ago · 11 km deep · 5 km away
  31. 2.530 km ENE of Soledad, California · 18662 days ago · 7 km deep · 58 km away
  32. 1.619 km SSE of Tres Pinos, California · 18662 days ago · 9 km deep · 78 km away
  33. 3.03 km SSW of Three Rocks, California · 18662 days ago · 8 km deep · 5 km away
  34. 3.923 km ENE of San Lucas, California · 18661 days ago · 5 km deep · 44 km away
  35. 2.017 km SSE of Tres Pinos, California · 18661 days ago · 4 km deep · 81 km away
  36. 2.624 km SE of Tres Pinos, California · 18661 days ago · 4 km deep · 71 km away
  37. 3.521 km NE of Soledad, California · 18661 days ago · 5 km deep · 68 km away
  38. 2.522 km ENE of Soledad, California · 18660 days ago · 3 km deep · 65 km away
  39. 2.622 km NE of King City, California · 18660 days ago · 6 km deep · 50 km away
  40. 2.521 km NNE of Soledad, California · 18660 days ago · 7 km deep · 75 km away
  41. 2.821 km NE of Soledad, California · 18659 days ago · 5 km deep · 68 km away
  42. 3.616 km SSE of Tres Pinos, California · 18659 days ago · 3 km deep · 83 km away
  43. 2.421 km NE of Soledad, California · 18659 days ago · 5 km deep · 69 km away
  44. 2.122 km ENE of San Lucas, California · 18658 days ago · 6 km deep · 45 km away
  45. 2.422 km SSE of Tres Pinos, California · 18658 days ago · 2 km deep · 77 km away
  46. 2.816 km NW of Parkfield, California · 18657 days ago · 1 km deep · 52 km away
  47. 1.825 km NE of Soledad, California · 18656 days ago · 8 km deep · 68 km away
  48. 2.725 km NE of Soledad, California · 18656 days ago · 8 km deep · 67 km away
  49. 1.725 km NE of Soledad, California · 18656 days ago · 8 km deep · 68 km away
  50. 1.531 km SSW of South Dos Palos, California · 18656 days ago · 11 km deep · 50 km away
  51. 2.019 km SSE of Tres Pinos, California · 18656 days ago · 6 km deep · 79 km away
  52. 1.725 km NE of Soledad, California · 18656 days ago · 8 km deep · 68 km away
  53. 1.922 km NNE of Soledad, California · 18655 days ago · 2 km deep · 77 km away
  54. 2.325 km NE of Soledad, California · 18655 days ago · 8 km deep · 68 km away
  55. 2.725 km NE of Soledad, California · 18655 days ago · 7 km deep · 68 km away
  56. 4.225 km NE of Soledad, California · 18655 days ago · 8 km deep · 68 km away
  57. 2.625 km NE of Soledad, California · 18655 days ago · 8 km deep · 68 km away
  58. 2.330 km ESE of Tres Pinos, California · 18654 days ago · 0 km deep · 62 km away
  59. 2.7Central California · 18654 days ago · 8 km deep · 67 km away
  60. 2.7Central California · 18654 days ago · 4 km deep · 90 km away

The first 60 of at least 199.

Before

  1. 3.422 km ENE of Soledad, California · 18670 days ago · 3 km deep · 67 km away
  2. 2.24 km NE of Tres Pinos, California · 18671 days ago · 8 km deep · 92 km away
  3. 2.721 km NE of Soledad, California · 18671 days ago · 2 km deep · 69 km away
  4. 2.219 km WNW of Lockwood, California · 18671 days ago · 5 km deep · 91 km away
  5. 2.021 km NE of Soledad, California · 18671 days ago · 8 km deep · 74 km away
  6. 2.05 km SSW of Tres Pinos, California · 18671 days ago · 8 km deep · 93 km away
  7. 1.731 km SE of Tres Pinos, California · 18671 days ago · 2 km deep · 62 km away
  8. 2.621 km NE of Soledad, California · 18671 days ago · 2 km deep · 69 km away
  9. 1.824 km ESE of Tres Pinos, California · 18671 days ago · 4 km deep · 69 km away
  10. 2.123 km ENE of Soledad, California · 18672 days ago · 1 km deep · 65 km away
  11. 3.225 km ENE of Greenfield, California · 18673 days ago · 1 km deep · 56 km away
  12. 2.422 km ENE of San Ardo, California · 18673 days ago · 3 km deep · 46 km away
  13. 3.516 km NW of Parkfield, California · 18674 days ago · 4 km deep · 52 km away
  14. 3.75 km SW of Three Rocks, California · 18674 days ago · 16 km deep · 5 km away
  15. 2.335 km ENE of Soledad, California · 18674 days ago · 6 km deep · 53 km away
  16. 2.321 km NNE of Soledad, California · 18674 days ago · 4 km deep · 75 km away
  17. 4.16 km S of Three Rocks, California · 18675 days ago · 16 km deep · 1 km away
  18. 2.221 km NE of Soledad, California · 18675 days ago · 5 km deep · 73 km away
  19. 1.924 km ENE of Soledad, California · 18675 days ago · 7 km deep · 66 km away
  20. 2.324 km NE of Soledad, California · 18675 days ago · 7 km deep · 65 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1025860. Read Fri, Oct 2, 2026, 8:47 PM UTC.