California earthquakes

M2.8 earthquake 3 km SSE of Three Rocks, California

A magnitude 2.8 earthquake struck 3 km SSE of Three Rocks, California on Mon, Aug 4, 1975, 5:21 AM PDT (12:21 UTC), 7 km (4 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
2.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1975-08-04 12:21:18 UTC
Depth
7.2 km (4.5 mi), shallow
Epicenter
36.472° N, 120.384° 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 0.6 km horizontally, 3.2 km in depth
Magnitude uncertainty
±0.52
Depth from
From location
Station coverage gap
130°
Stations used
22

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 110 in the 30 days before it.

After

  1. 3.621 km SSE of Tres Pinos, California · 18687 days ago · 4 km deep · 77 km away
  2. 1.82 km SW of Ridgemark, California · 18687 days ago · 8 km deep · 97 km away
  3. 3.29 km SSE of Three Rocks, California · 18687 days ago · 16 km deep · 6 km away
  4. 3.16 km S of Three Rocks, California · 18686 days ago · 14 km deep · 3 km away
  5. 2.527 km NE of Soledad, California · 18686 days ago · 9 km deep · 64 km away
  6. 2.022 km NNE of Soledad, California · 18686 days ago · 5 km deep · 76 km away
  7. 2.35 km SSW of Tres Pinos, California · 18686 days ago · 8 km deep · 91 km away
  8. 2.525 km NNE of King City, California · 18685 days ago · 1 km deep · 53 km away
  9. 2.541 km W of Three Rocks, California · 18685 days ago · 4 km deep · 43 km away
  10. 2.93 km SSW of Cantua Creek, California · 18685 days ago · 9 km deep · 4 km away
  11. 2.122 km ENE of Soledad, California · 18685 days ago · 2 km deep · 65 km away
  12. 3.322 km ENE of San Ardo, California · 18684 days ago · 3 km deep · 51 km away
  13. 3.68 km S of Three Rocks, California · 18684 days ago · 11 km deep · 5 km away
  14. 3.18 km S of Three Rocks, California · 18684 days ago · 16 km deep · 6 km away
  15. 3.98 km S of Three Rocks, California · 18684 days ago · 15 km deep · 5 km away
  16. 4.0Central California · 18683 days ago · 11 km deep · 2 km away
  17. 2.612 km S of Tres Pinos, California · 18683 days ago · 2 km deep · 86 km away
  18. 2.717 km SSE of Tres Pinos, California · 18683 days ago · 6 km deep · 80 km away
  19. 1.620 km NE of Soledad, California · 18681 days ago · 7 km deep · 70 km away
  20. 2.08 km ESE of Tres Pinos, California · 18681 days ago · 4 km deep · 82 km away
  21. 3.212 km WNW of Avenal, California · 18681 days ago · 11 km deep · 50 km away
  22. 3.027 km NE of Soledad, California · 18680 days ago · 9 km deep · 62 km away
  23. 2.824 km NE of King City, California · 18680 days ago · 2 km deep · 51 km away
  24. 2.521 km ENE of San Lucas, California · 18679 days ago · 3 km deep · 48 km away
  25. 1.814 km NNE of Shandon, California · 18679 days ago · 7 km deep · 77 km away
  26. 3.321 km NW of Parkfield, California · 18679 days ago · 3 km deep · 53 km away
  27. 2.421 km NW of Parkfield, California · 18679 days ago · 6 km deep · 53 km away
  28. 2.523 km NE of Soledad, California · 18677 days ago · 9 km deep · 68 km away
  29. 2.216 km SSE of Tres Pinos, California · 18677 days ago · 2 km deep · 81 km away
  30. 2.624 km NE of Soledad, California · 18677 days ago · 10 km deep · 67 km away
  31. 4.65 km SSW of Three Rocks, California · 18676 days ago · 12 km deep · 3 km away
  32. 2.229 km ENE of Soledad, California · 18676 days ago · 7 km deep · 61 km away
  33. 2.426 km NE of King City, California · 18675 days ago · 3 km deep · 50 km away
  34. 2.511 km NW of Parkfield, California · 18675 days ago · 12 km deep · 56 km away
  35. 2.324 km NE of Soledad, California · 18675 days ago · 7 km deep · 64 km away
  36. 1.924 km ENE of Soledad, California · 18675 days ago · 7 km deep · 65 km away
  37. 2.221 km NE of Soledad, California · 18675 days ago · 5 km deep · 72 km away
  38. 4.16 km S of Three Rocks, California · 18675 days ago · 16 km deep · 3 km away
  39. 2.321 km NNE of Soledad, California · 18674 days ago · 4 km deep · 73 km away
  40. 2.335 km ENE of Soledad, California · 18674 days ago · 6 km deep · 52 km away
  41. 3.75 km SW of Three Rocks, California · 18674 days ago · 16 km deep · 4 km away
  42. 3.516 km NW of Parkfield, California · 18674 days ago · 4 km deep · 55 km away
  43. 2.422 km ENE of San Ardo, California · 18673 days ago · 3 km deep · 49 km away
  44. 3.225 km ENE of Greenfield, California · 18673 days ago · 1 km deep · 56 km away
  45. 2.123 km ENE of Soledad, California · 18672 days ago · 1 km deep · 64 km away
  46. 1.824 km ESE of Tres Pinos, California · 18671 days ago · 4 km deep · 67 km away
  47. 2.621 km NE of Soledad, California · 18671 days ago · 2 km deep · 68 km away
  48. 1.731 km SE of Tres Pinos, California · 18671 days ago · 2 km deep · 61 km away
  49. 2.05 km SSW of Tres Pinos, California · 18671 days ago · 8 km deep · 91 km away
  50. 2.021 km NE of Soledad, California · 18671 days ago · 8 km deep · 73 km away
  51. 2.219 km WNW of Lockwood, California · 18671 days ago · 5 km deep · 92 km away
  52. 2.721 km NE of Soledad, California · 18671 days ago · 2 km deep · 68 km away
  53. 2.24 km NE of Tres Pinos, California · 18671 days ago · 8 km deep · 89 km away
  54. 3.422 km ENE of Soledad, California · 18670 days ago · 3 km deep · 66 km away
  55. 4.37 km S of Three Rocks, California · 18670 days ago · 16 km deep · 4 km away
  56. 1.920 km ESE of Tres Pinos, California · 18670 days ago · 0 km deep · 70 km away
  57. 2.421 km NE of Soledad, California · 18670 days ago · 2 km deep · 68 km away
  58. 2.921 km NE of Soledad, California · 18669 days ago · 6 km deep · 69 km away
  59. 2.525 km ENE of San Ardo, California · 18669 days ago · 8 km deep · 47 km away
  60. 2.623 km NE of King City, California · 18669 days ago · 3 km deep · 51 km away

The first 60 of at least 199.

Before

  1. 3.120 km S of Avenal, California · 18687 days ago · 22 km deep · 76 km away
  2. 3.037 km W of Three Rocks, California · 18687 days ago · 1 km deep · 38 km away
  3. 3.18 km S of Cantua Creek, California · 18687 days ago · 13 km deep · 7 km away
  4. 3.13 km SE of Three Rocks, California · 18688 days ago · 2 km deep · 2 km away
  5. 3.47 km S of Three Rocks, California · 18688 days ago · 19 km deep · 4 km away
  6. 3.58 km S of Three Rocks, California · 18688 days ago · 10 km deep · 6 km away
  7. 2.122 km NE of San Lucas, California · 18688 days ago · 8 km deep · 47 km away
  8. 2.42 km SW of Ridgemark, California · 18688 days ago · 8 km deep · 97 km away
  9. 3.224 km ENE of Greenfield, California · 18688 days ago · 5 km deep · 56 km away
  10. 2.224 km ENE of Greenfield, California · 18688 days ago · 5 km deep · 56 km away
  11. 2.331 km ENE of Soledad, California · 18688 days ago · 7 km deep · 59 km away
  12. 3.06 km S of Three Rocks, California · 18688 days ago · 11 km deep · 3 km away
  13. 4.46 km S of Three Rocks, California · 18688 days ago · 11 km deep · 3 km away
  14. 3.58 km SSE of Three Rocks, California · 18688 days ago · 17 km deep · 6 km away
  15. 3.84 km S of Three Rocks, California · 18688 days ago · 9 km deep · 2 km away
  16. 3.18 km S of Three Rocks, California · 18688 days ago · 15 km deep · 5 km away
  17. 3.5Central California · 18688 days ago · 11 km deep · 4 km away
  18. 3.07 km S of Three Rocks, California · 18688 days ago · 18 km deep · 5 km away
  19. 2.98 km SSE of Three Rocks, California · 18688 days ago · 3 km deep · 5 km away
  20. 1.613 km S of Tres Pinos, California · 18688 days ago · 5 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1025311. Read Fri, Oct 2, 2026, 8:44 PM UTC.