California earthquakes

M3.1 earthquake 1 km E of Ridgemark, California

A magnitude 3.1 earthquake struck 1 km E of Ridgemark, California on Sun, Oct 26, 1975, 12:24 AM PDT (07:24 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.4 9 km NNW of Hollister, 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
3.1 (Md, duration), minor
Magnitude from
Northern California Seismic System
Local time
UTC
1975-10-26 07:24:44 UTC
Depth
6.5 km (4.0 mi), shallow
Epicenter
36.812° N, 121.353° 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 0.2 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.63
Depth from
From location
Station coverage gap
41°
Stations used
44

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 187 in the 60 days after this one and 131 in the 30 days before it.

After

  1. 2.724 km NE of Greenfield, California · 18605 days ago · 3 km deep · 46 km away
  2. 2.029 km NE of Soledad, California · 18605 days ago · 9 km deep · 35 km away
  3. 2.229 km NE of Soledad, California · 18605 days ago · 9 km deep · 35 km away
  4. 2.04 km E of Tres Pinos, California · 18605 days ago · 7 km deep · 7 km away
  5. 1.718 km SSE of Tres Pinos, California · 18605 days ago · 7 km deep · 22 km away
  6. 1.812 km S of Tres Pinos, California · 18605 days ago · 4 km deep · 15 km away
  7. 2.0Central California · 18605 days ago · 5 km deep · 86 km away
  8. 2.424 km ENE of Greenfield, California · 18605 days ago · 2 km deep · 51 km away
  9. 1.821 km SSE of Tres Pinos, California · 18605 days ago · 5 km deep · 24 km away
  10. 1.811 km NNE of Morgan Hill, California · 18604 days ago · 1 km deep · 52 km away
  11. 2.436 km NE of King City, California · 18604 days ago · 15 km deep · 56 km away
  12. 2.110 km E of Tres Pinos, California · 18604 days ago · 10 km deep · 14 km away
  13. 2.022 km ENE of Soledad, California · 18603 days ago · 2 km deep · 38 km away
  14. 2.521 km NE of Soledad, California · 18603 days ago · 3 km deep · 32 km away
  15. 2.533 km SE of Tres Pinos, California · 18603 days ago · 5 km deep · 37 km away
  16. 2.3Central California · 18602 days ago · 5 km deep · 17 km away
  17. 1.824 km NE of King City, California · 18602 days ago · 5 km deep · 58 km away
  18. 2.424 km NE of Greenfield, California · 18602 days ago · 1 km deep · 47 km away
  19. 2.010 km NNW of Hollister, California · 18602 days ago · 5 km deep · 17 km away
  20. 2.523 km ENE of King City, California · 18601 days ago · 4 km deep · 67 km away
  21. 2.58 km NE of Interlaken, California · 18601 days ago · 9 km deep · 35 km away
  22. 1.525 km SE of Livermore, California · 18601 days ago · 0 km deep · 80 km away
  23. 1.515 km SSE of Tres Pinos, California · 18601 days ago · 6 km deep · 19 km away
  24. 2.425 km NNE of King City, California · 18601 days ago · 1 km deep · 56 km away
  25. 2.07 km NNE of East Foothills, California · 18601 days ago · 10 km deep · 79 km away
  26. 2.27 km ENE of Interlaken, California · 18601 days ago · 8 km deep · 34 km away
  27. 2.315 km SSE of Tres Pinos, California · 18600 days ago · 7 km deep · 18 km away
  28. 2.815 km SSE of Tres Pinos, California · 18600 days ago · 7 km deep · 18 km away
  29. 1.75 km SE of Tres Pinos, California · 18600 days ago · 6 km deep · 10 km away
  30. 2.39 km NW of Hollister, California · 18600 days ago · 4 km deep · 16 km away
  31. 2.517 km SW of Volta, California · 18599 days ago · 0 km deep · 32 km away
  32. 2.56 km ENE of Interlaken, California · 18599 days ago · 6 km deep · 32 km away
  33. 2.422 km ENE of Soledad, California · 18599 days ago · 3 km deep · 40 km away
  34. 2.29 km NW of Hollister, California · 18599 days ago · 9 km deep · 15 km away
  35. 1.518 km SSE of Tres Pinos, California · 18598 days ago · 5 km deep · 21 km away
  36. 1.97 km W of Gilroy, California · 18598 days ago · 3 km deep · 34 km away
  37. 1.99 km NW of Hollister, California · 18598 days ago · 4 km deep · 16 km away
  38. 2.024 km NE of Greenfield, California · 18598 days ago · 7 km deep · 45 km away
  39. 2.213 km NNE of Soledad, California · 18598 days ago · 14 km deep · 30 km away
  40. 2.411 km S of Tres Pinos, California · 18598 days ago · 4 km deep · 14 km away
  41. 3.61 km SW of San Juan Bautista, California · 18598 days ago · 4 km deep · 18 km away
  42. 2.311 km S of Tres Pinos, California · 18597 days ago · 4 km deep · 14 km away
  43. 3.029 km NE of Soledad, California · 18597 days ago · 9 km deep · 36 km away
  44. 1.921 km NE of Soledad, California · 18597 days ago · 7 km deep · 32 km away
  45. 1.86 km E of Tres Pinos, California · 18596 days ago · 8 km deep · 10 km away
  46. 2.58 km NE of San Martin, California · 18596 days ago · 8 km deep · 39 km away
  47. 1.92 km ENE of San Ardo, California · 18596 days ago · 14 km deep · 97 km away
  48. 1.520 km SSE of Livermore, California · 18596 days ago · 0 km deep · 84 km away
  49. 2.75 km NE of Interlaken, California · 18596 days ago · 4 km deep · 36 km away
  50. 4.010 km NNW of Hollister, California · 18596 days ago · 7 km deep · 17 km away
  51. 2.910 km NNW of Hollister, California · 18596 days ago · 6 km deep · 17 km away
  52. 2.610 km NNW of Hollister, California · 18596 days ago · 5 km deep · 17 km away
  53. 2.81 km ESE of San Ardo, California · 18596 days ago · 13 km deep · 98 km away
  54. 1.810 km NNW of Hollister, California · 18596 days ago · 4 km deep · 17 km away
  55. 3.215 km SSE of Tres Pinos, California · 18595 days ago · 7 km deep · 19 km away
  56. 1.515 km SSE of Tres Pinos, California · 18595 days ago · 6 km deep · 19 km away
  57. 3.110 km NNW of Hollister, California · 18595 days ago · 5 km deep · 17 km away
  58. 2.310 km NNW of Hollister, California · 18595 days ago · 5 km deep · 17 km away
  59. 1.721 km NE of East Foothills, California · 18595 days ago · 3 km deep · 81 km away
  60. 1.88 km NE of San Martin, California · 18595 days ago · 3 km deep · 40 km away

The first 60 of 187.

Before

  1. 2.01 km NNE of Hollister, California · 18605 days ago · 8 km deep · 7 km away
  2. 2.28 km NW of Hollister, California · 18606 days ago · 5 km deep · 15 km away
  3. 2.54 km WSW of Gilroy, California · 18606 days ago · 6 km deep · 31 km away
  4. 2.11 km W of Tres Pinos, California · 18606 days ago · 5 km deep · 3 km away
  5. 2.415 km ENE of Gilroy, California · 18606 days ago · 7 km deep · 25 km away
  6. 3.78 km NW of Hollister, California · 18607 days ago · 7 km deep · 15 km away
  7. 1.74 km E of East Foothills, California · 18607 days ago · 1 km deep · 72 km away
  8. 2.817 km SW of Volta, California · 18607 days ago · 0 km deep · 32 km away
  9. 2.323 km ENE of Soledad, California · 18607 days ago · 4 km deep · 43 km away
  10. 2.724 km ENE of Soledad, California · 18607 days ago · 7 km deep · 39 km away
  11. 2.411 km N of Morgan Hill, California · 18607 days ago · 6 km deep · 54 km away
  12. 3.524 km NE of Greenfield, California · 18608 days ago · 4 km deep · 47 km away
  13. 1.93 km SE of Sunol, California · 18608 days ago · 10 km deep · 96 km away
  14. 1.813 km S of Tres Pinos, California · 18608 days ago · 4 km deep · 17 km away
  15. 2.82 km S of Stanford, California · 18608 days ago · 6 km deep · 97 km away
  16. 2.32 km SW of San Juan Bautista, California · 18609 days ago · 8 km deep · 19 km away
  17. 3.025 km ENE of Greenfield, California · 18609 days ago · 1 km deep · 51 km away
  18. 2.39 km NW of Hollister, California · 18609 days ago · 4 km deep · 16 km away
  19. 2.831 km NE of Soledad, California · 18610 days ago · 8 km deep · 37 km away
  20. 3.34 km N of Carmel Valley Village, California · 18610 days ago · 9 km deep · 47 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1027169. Read Sat, Oct 3, 2026, 2:44 PM UTC.