California earthquakes

M3.2 earthquake 21 km WSW of Three Rocks, California

A magnitude 3.2 earthquake struck 21 km WSW of Three Rocks, California on Sun, Apr 20, 1975, 1:17 AM PDT (08:17 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M3.9 23 km NE of Soledad, 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
3.2 (md), minor
Local time
UTC
1975-04-20 08:17:37 UTC
Depth
15.0 km (9.3 mi), shallow
Epicenter
36.444° N, 120.620° 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, 1.0 km in depth
Magnitude uncertainty
±0.84
Depth from
From location
Station coverage gap
140°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 198 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.823 km NE of Greenfield, California · 18762 days ago · 2 km deep · 39 km away
  2. 2.410 km S of Tres Pinos, California · 18762 days ago · 4 km deep · 70 km away
  3. 2.916 km SSE of Tres Pinos, California · 18762 days ago · 4 km deep · 62 km away
  4. 3.923 km NE of Soledad, California · 18762 days ago · 9 km deep · 47 km away
  5. 2.82 km ESE of San Ardo, California · 18762 days ago · 10 km deep · 54 km away
  6. 2.524 km ENE of Soledad, California · 18762 days ago · 3 km deep · 41 km away
  7. 2.31 km SE of San Ardo, California · 18762 days ago · 6 km deep · 54 km away
  8. 2.323 km SSE of Tres Pinos, California · 18762 days ago · 7 km deep · 54 km away
  9. 2.115 km SE of Tres Pinos, California · 18762 days ago · 8 km deep · 58 km away
  10. 3.223 km NW of Parkfield, California · 18761 days ago · 7 km deep · 44 km away
  11. 2.323 km NW of Parkfield, California · 18761 days ago · 6 km deep · 44 km away
  12. 2.523 km ENE of Soledad, California · 18761 days ago · 4 km deep · 42 km away
  13. 1.923 km ENE of Soledad, California · 18760 days ago · 3 km deep · 43 km away
  14. 2.630 km ENE of Soledad, California · 18760 days ago · 7 km deep · 40 km away
  15. 2.330 km ENE of Soledad, California · 18760 days ago · 6 km deep · 40 km away
  16. 2.623 km NW of Parkfield, California · 18760 days ago · 6 km deep · 44 km away
  17. 2.19 km NW of Volta, California · 18760 days ago · 2 km deep · 86 km away
  18. 2.222 km NE of Soledad, California · 18759 days ago · 5 km deep · 47 km away
  19. 2.66 km NW of Parkfield, California · 18759 days ago · 5 km deep · 57 km away
  20. 2.121 km NE of Soledad, California · 18759 days ago · 6 km deep · 47 km away
  21. 1.79 km NE of San Juan Bautista, California · 18759 days ago · 4 km deep · 93 km away
  22. 2.49 km NW of Hollister, California · 18759 days ago · 4 km deep · 92 km away
  23. 2.921 km NE of Soledad, California · 18759 days ago · 1 km deep · 50 km away
  24. 3.34 km W of San Juan Bautista, California · 18759 days ago · 9 km deep · 97 km away
  25. 4.028 km NE of Soledad, California · 18758 days ago · 11 km deep · 45 km away
  26. 2.627 km NE of Soledad, California · 18758 days ago · 10 km deep · 46 km away
  27. 4.121 km NNE of Soledad, California · 18758 days ago · 9 km deep · 55 km away
  28. 1.827 km NE of Soledad, California · 18757 days ago · 11 km deep · 46 km away
  29. 2.322 km ENE of Soledad, California · 18756 days ago · 8 km deep · 43 km away
  30. 2.527 km NE of Soledad, California · 18756 days ago · 11 km deep · 45 km away
  31. 3.023 km ENE of San Lucas, California · 18756 days ago · 5 km deep · 29 km away
  32. 2.628 km ENE of Soledad, California · 18756 days ago · 11 km deep · 42 km away
  33. 3.324 km ENE of Soledad, California · 18756 days ago · 3 km deep · 41 km away
  34. 2.421 km ESE of Tres Pinos, California · 18755 days ago · 0 km deep · 52 km away
  35. 2.427 km NE of Soledad, California · 18755 days ago · 10 km deep · 44 km away
  36. 3.314 km WNW of Oak Shores, California · 18755 days ago · 14 km deep · 86 km away
  37. 3.815 km W of Oak Shores, California · 18755 days ago · 6 km deep · 86 km away
  38. 3.17 km SSE of Gustine, California · 18755 days ago · 0 km deep · 89 km away
  39. 1.816 km SSE of Tres Pinos, California · 18754 days ago · 5 km deep · 63 km away
  40. 1.727 km ENE of Soledad, California · 18753 days ago · 8 km deep · 42 km away
  41. 3.513 km NNW of San Simeon, California · 18753 days ago · 9 km deep · 96 km away
  42. 3.06 km NE of Hollister, California · 18753 days ago · 4 km deep · 82 km away
  43. 2.411 km E of Gilroy, California · 18753 days ago · 4 km deep · 95 km away
  44. 3.58 km NE of San Juan Bautista, California · 18752 days ago · 5 km deep · 92 km away
  45. 2.57 km E of San Lucas, California · 18752 days ago · 0 km deep · 44 km away
  46. 2.521 km ENE of San Lucas, California · 18752 days ago · 3 km deep · 30 km away
  47. 3.712 km NW of Parkfield, California · 18752 days ago · 10 km deep · 53 km away
  48. 3.022 km ENE of San Lucas, California · 18751 days ago · 8 km deep · 30 km away
  49. 1.88 km NW of Hollister, California · 18751 days ago · 3 km deep · 92 km away
  50. 3.921 km NNE of Soledad, California · 18751 days ago · 7 km deep · 54 km away
  51. 2.722 km ENE of San Lucas, California · 18751 days ago · 8 km deep · 30 km away
  52. 2.010 km ESE of Gilroy, California · 18751 days ago · 3 km deep · 96 km away
  53. 3.314 km SSE of Tres Pinos, California · 18751 days ago · 3 km deep · 64 km away
  54. 2.411 km NW of Parkfield, California · 18751 days ago · 10 km deep · 53 km away
  55. 2.912 km NW of Parkfield, California · 18751 days ago · 11 km deep · 52 km away
  56. 1.712 km NW of Parkfield, California · 18750 days ago · 11 km deep · 52 km away
  57. 2.716 km SE of Tres Pinos, California · 18750 days ago · 11 km deep · 57 km away
  58. 3.723 km NE of San Ardo, California · 18750 days ago · 7 km deep · 31 km away
  59. 2.012 km NE of Shandon, California · 18750 days ago · 12 km deep · 84 km away
  60. 1.921 km NE of Soledad, California · 18750 days ago · 8 km deep · 49 km away

The first 60 of 198.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1023604. Read Tue, Sep 22, 2026, 9:39 PM UTC.