California earthquakes

M1.7 earthquake Central California

A magnitude 1.7 earthquake struck in Central California on Mon, Oct 20, 1975, 7:40 AM PDT (14:40 UTC), 5 km (3 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
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1975-10-20 14:40:01 UTC
Depth
5.4 km (3.3 mi), shallow
Epicenter
36.788° N, 121.334° 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, 0.5 km in depth
Magnitude uncertainty
±0.37
Depth from
From location
Station coverage gap
55°
Stations used
25

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 125 in the 30 days before it.

After

  1. 2.66 km SSW of Gilroy, California · 18609 days ago · 7 km deep · 30 km away
  2. 2.713 km NNE of East Foothills, California · 18609 days ago · 7 km deep · 88 km away
  3. 2.021 km NE of Soledad, California · 18609 days ago · 6 km deep · 30 km away
  4. 1.99 km NW of Hollister, California · 18608 days ago · 4 km deep · 19 km away
  5. 2.0Central California · 18608 days ago · 4 km deep · 19 km away
  6. 2.97 km ENE of Gilroy, California · 18608 days ago · 8 km deep · 31 km away
  7. 3.34 km N of Carmel Valley Village, California · 18608 days ago · 9 km deep · 47 km away
  8. 2.831 km NE of Soledad, California · 18607 days ago · 8 km deep · 34 km away
  9. 2.39 km NW of Hollister, California · 18607 days ago · 4 km deep · 19 km away
  10. 3.025 km ENE of Greenfield, California · 18607 days ago · 1 km deep · 48 km away
  11. 2.32 km SW of San Juan Bautista, California · 18607 days ago · 8 km deep · 21 km away
  12. 1.813 km S of Tres Pinos, California · 18606 days ago · 4 km deep · 14 km away
  13. 1.93 km SE of Sunol, California · 18606 days ago · 10 km deep · 99 km away
  14. 3.524 km NE of Greenfield, California · 18606 days ago · 4 km deep · 44 km away
  15. 2.411 km N of Morgan Hill, California · 18605 days ago · 6 km deep · 58 km away
  16. 2.724 km ENE of Soledad, California · 18605 days ago · 7 km deep · 36 km away
  17. 2.323 km ENE of Soledad, California · 18605 days ago · 4 km deep · 40 km away
  18. 2.817 km SW of Volta, California · 18605 days ago · 0 km deep · 33 km away
  19. 1.74 km E of East Foothills, California · 18605 days ago · 1 km deep · 76 km away
  20. 3.78 km NW of Hollister, California · 18604 days ago · 7 km deep · 18 km away
  21. 2.415 km ENE of Gilroy, California · 18604 days ago · 7 km deep · 28 km away
  22. 2.11 km W of Tres Pinos, California · 18604 days ago · 5 km deep · 0 km away
  23. 2.54 km WSW of Gilroy, California · 18604 days ago · 6 km deep · 34 km away
  24. 2.28 km NW of Hollister, California · 18603 days ago · 5 km deep · 18 km away
  25. 2.01 km NNE of Hollister, California · 18603 days ago · 8 km deep · 10 km away
  26. 3.11 km E of Ridgemark, California · 18603 days ago · 7 km deep · 3 km away
  27. 2.724 km NE of Greenfield, California · 18603 days ago · 3 km deep · 43 km away
  28. 2.029 km NE of Soledad, California · 18603 days ago · 9 km deep · 32 km away
  29. 2.229 km NE of Soledad, California · 18603 days ago · 9 km deep · 32 km away
  30. 2.04 km E of Tres Pinos, California · 18603 days ago · 7 km deep · 5 km away
  31. 1.718 km SSE of Tres Pinos, California · 18603 days ago · 7 km deep · 19 km away
  32. 1.812 km S of Tres Pinos, California · 18603 days ago · 4 km deep · 12 km away
  33. 2.0Central California · 18603 days ago · 5 km deep · 83 km away
  34. 2.424 km ENE of Greenfield, California · 18603 days ago · 2 km deep · 48 km away
  35. 1.821 km SSE of Tres Pinos, California · 18602 days ago · 5 km deep · 21 km away
  36. 1.811 km NNE of Morgan Hill, California · 18602 days ago · 1 km deep · 55 km away
  37. 2.436 km NE of King City, California · 18602 days ago · 15 km deep · 53 km away
  38. 2.110 km E of Tres Pinos, California · 18602 days ago · 10 km deep · 12 km away
  39. 2.022 km ENE of Soledad, California · 18601 days ago · 2 km deep · 35 km away
  40. 2.521 km NE of Soledad, California · 18601 days ago · 3 km deep · 29 km away
  41. 2.533 km SE of Tres Pinos, California · 18600 days ago · 5 km deep · 34 km away
  42. 2.3Central California · 18600 days ago · 5 km deep · 20 km away
  43. 1.824 km NE of King City, California · 18600 days ago · 5 km deep · 55 km away
  44. 2.424 km NE of Greenfield, California · 18600 days ago · 1 km deep · 44 km away
  45. 2.010 km NNW of Hollister, California · 18600 days ago · 5 km deep · 20 km away
  46. 2.523 km ENE of King City, California · 18599 days ago · 4 km deep · 64 km away
  47. 2.58 km NE of Interlaken, California · 18599 days ago · 9 km deep · 38 km away
  48. 1.525 km SE of Livermore, California · 18599 days ago · 0 km deep · 83 km away
  49. 1.515 km SSE of Tres Pinos, California · 18599 days ago · 6 km deep · 16 km away
  50. 2.425 km NNE of King City, California · 18599 days ago · 1 km deep · 53 km away
  51. 2.07 km NNE of East Foothills, California · 18599 days ago · 10 km deep · 82 km away
  52. 2.27 km ENE of Interlaken, California · 18598 days ago · 8 km deep · 37 km away
  53. 2.315 km SSE of Tres Pinos, California · 18598 days ago · 7 km deep · 15 km away
  54. 2.815 km SSE of Tres Pinos, California · 18598 days ago · 7 km deep · 15 km away
  55. 1.75 km SE of Tres Pinos, California · 18598 days ago · 6 km deep · 7 km away
  56. 2.39 km NW of Hollister, California · 18597 days ago · 4 km deep · 19 km away
  57. 2.517 km SW of Volta, California · 18597 days ago · 0 km deep · 33 km away
  58. 2.56 km ENE of Interlaken, California · 18597 days ago · 6 km deep · 35 km away
  59. 2.422 km ENE of Soledad, California · 18597 days ago · 3 km deep · 37 km away
  60. 2.29 km NW of Hollister, California · 18596 days ago · 9 km deep · 18 km away

The first 60 of 187.

Before

  1. 2.6Central California · 18609 days ago · 6 km deep · 31 km away
  2. 2.68 km NE of San Juan Bautista, California · 18609 days ago · 4 km deep · 18 km away
  3. 2.29 km NW of Hollister, California · 18609 days ago · 2 km deep · 19 km away
  4. 1.620 km SE of Tres Pinos, California · 18610 days ago · 14 km deep · 22 km away
  5. 2.324 km NE of Greenfield, California · 18610 days ago · 3 km deep · 44 km away
  6. 2.09 km NNW of Hollister, California · 18610 days ago · 3 km deep · 19 km away
  7. 2.5Central California · 18610 days ago · 4 km deep · 23 km away
  8. 2.924 km ENE of Greenfield, California · 18610 days ago · 2 km deep · 48 km away
  9. 2.68 km NE of San Juan Bautista, California · 18611 days ago · 5 km deep · 19 km away
  10. 1.827 km SE of Tres Pinos, California · 18611 days ago · 6 km deep · 29 km away
  11. 1.89 km SE of Alum Rock, California · 18611 days ago · 4 km deep · 69 km away
  12. 1.727 km SE of Tres Pinos, California · 18611 days ago · 6 km deep · 28 km away
  13. 2.85 km S of Gilroy, California · 18611 days ago · 6 km deep · 29 km away
  14. 1.56 km NE of East Foothills, California · 18611 days ago · 7 km deep · 79 km away
  15. 2.622 km NE of Soledad, California · 18612 days ago · 3 km deep · 33 km away
  16. 2.227 km ENE of Greenfield, California · 18613 days ago · 9 km deep · 51 km away
  17. 1.825 km NE of Soledad, California · 18613 days ago · 8 km deep · 30 km away
  18. 2.622 km NE of San Lucas, California · 18613 days ago · 6 km deep · 69 km away
  19. 1.625 km NE of Soledad, California · 18613 days ago · 6 km deep · 31 km away
  20. 2.725 km NE of Soledad, California · 18613 days ago · 9 km deep · 31 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1027081. Read Thu, Oct 1, 2026, 12:53 PM UTC.