California earthquakes

M3.5 earthquake 7 km WSW of Ridgemark, California

A magnitude 3.5 earthquake struck 7 km WSW of Ridgemark, California on Sun, Mar 21, 1976, 4:41 AM PST (12:41 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M3.5 32 km W of Three Rocks, 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
3.5 (md), minor
Local time
UTC
1976-03-21 12:41:00 UTC
Depth
8.9 km (5.5 mi), shallow
Epicenter
36.785° N, 121.447° 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, 0.7 km in depth
Magnitude uncertainty
±0.62
Depth from
From location
Station coverage gap
33°
Stations used
56

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 182 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.67 km S of Sunol, California · 18443 days ago · 6 km deep · 92 km away
  2. 2.77 km S of Sunol, California · 18443 days ago · 7 km deep · 92 km away
  3. 2.416 km NE of East Foothills, California · 18443 days ago · 8 km deep · 81 km away
  4. 2.110 km NE of Tres Pinos, California · 18443 days ago · 6 km deep · 20 km away
  5. 1.522 km ENE of Soledad, California · 18443 days ago · 4 km deep · 43 km away
  6. 1.57 km SSW of Tres Pinos, California · 18442 days ago · 4 km deep · 9 km away
  7. 1.722 km ENE of Soledad, California · 18442 days ago · 4 km deep · 44 km away
  8. 1.910 km NNW of Hollister, California · 18441 days ago · 4 km deep · 16 km away
  9. 1.99 km NW of Hollister, California · 18440 days ago · 3 km deep · 15 km away
  10. 2.016 km NE of East Foothills, California · 18440 days ago · 7 km deep · 81 km away
  11. 2.68 km ENE of Morgan Hill, California · 18440 days ago · 3 km deep · 42 km away
  12. 1.711 km N of Morgan Hill, CA · 18440 days ago · 7 km deep · 53 km away
  13. 2.810 km NW of Hollister, California · 18440 days ago · 4 km deep · 16 km away
  14. 2.221 km NE of Soledad, California · 18439 days ago · 8 km deep · 40 km away
  15. 2.0Central California · 18438 days ago · 7 km deep · 23 km away
  16. 2.422 km NE of Greenfield, California · 18438 days ago · 0 km deep · 53 km away
  17. 2.0Central California · 18438 days ago · 7 km deep · 64 km away
  18. 2.04 km N of Day Valley, California · 18438 days ago · 4 km deep · 49 km away
  19. 2.09 km NW of Hollister, California · 18437 days ago · 1 km deep · 15 km away
  20. 2.06 km NE of East Foothills, California · 18437 days ago · 8 km deep · 76 km away
  21. 2.19 km NE of San Juan Bautista, California · 18436 days ago · 5 km deep · 14 km away
  22. 2.010 km NNW of Hollister, California · 18435 days ago · 4 km deep · 16 km away
  23. 2.824 km NE of Greenfield, California · 18435 days ago · 7 km deep · 49 km away
  24. 2.722 km NE of San Lucas, California · 18435 days ago · 5 km deep · 75 km away
  25. 1.87 km NE of San Juan Bautista, California · 18434 days ago · 5 km deep · 13 km away
  26. 1.87 km NE of San Juan Bautista, California · 18434 days ago · 4 km deep · 14 km away
  27. 1.85 km SSW of Gilroy, California · 18434 days ago · 6 km deep · 24 km away
  28. 2.813 km N of Morgan Hill, California · 18434 days ago · 5 km deep · 55 km away
  29. 2.47 km WSW of Ridgemark, California · 18433 days ago · 10 km deep · 1 km away
  30. 2.52 km NW of Hollister, California · 18432 days ago · 4 km deep · 9 km away
  31. 2.03 km WNW of Pacific Grove, California · 18432 days ago · 7 km deep · 48 km away
  32. 2.05 km ENE of East Foothills, California · 18432 days ago · 3 km deep · 74 km away
  33. 2.79 km NW of Hollister, California · 18432 days ago · 6 km deep · 14 km away
  34. 1.64 km NE of Ridgemark, California · 18432 days ago · 6 km deep · 12 km away
  35. 2.323 km NE of King City, California · 18432 days ago · 5 km deep · 66 km away
  36. 2.36 km NNE of East Foothills, California · 18431 days ago · 7 km deep · 79 km away
  37. 3.225 km ENE of Greenfield, California · 18431 days ago · 1 km deep · 56 km away
  38. 2.413 km N of Hollister, California · 18431 days ago · 7 km deep · 22 km away
  39. 3.025 km ENE of Greenfield, California · 18431 days ago · -1 km deep · 56 km away
  40. 1.68 km ENE of East Foothills, California · 18431 days ago · 2 km deep · 74 km away
  41. 2.96 km SE of Tres Pinos, California · 18430 days ago · 10 km deep · 17 km away
  42. 1.921 km NNE of San Ardo, California · 18430 days ago · 6 km deep · 90 km away
  43. 1.924 km NE of Greenfield, California · 18430 days ago · 5 km deep · 50 km away
  44. 1.59 km SSW of Tres Pinos, California · 18429 days ago · 2 km deep · 13 km away
  45. 1.71 km SW of Campbell, California · 18429 days ago · 6 km deep · 71 km away
  46. 3.532 km W of Three Rocks, California · 18429 days ago · 8 km deep · 68 km away
  47. 2.07 km NNE of East Foothills, California · 18429 days ago · 10 km deep · 78 km away
  48. 1.54 km WNW of San Juan Bautista, California · 18429 days ago · 7 km deep · 15 km away
  49. 2.221 km NE of Soledad, California · 18428 days ago · 6 km deep · 34 km away
  50. 2.523 km NNE of San Lucas, California · 18428 days ago · 3 km deep · 72 km away
  51. 2.621 km SE of Tres Pinos, California · 18428 days ago · 8 km deep · 31 km away
  52. 1.719 km SSE of Tres Pinos, California · 18428 days ago · 5 km deep · 27 km away
  53. 3.522 km NE of Soledad, California · 18428 days ago · 4 km deep · 32 km away
  54. 3.023 km NNE of San Lucas, California · 18428 days ago · 4 km deep · 72 km away
  55. 2.424 km NE of Soledad, California · 18427 days ago · 8 km deep · 38 km away
  56. 2.916 km E of Seven Trees, California · 18427 days ago · 7 km deep · 58 km away
  57. 2.031 km NE of Soledad, California · 18427 days ago · 9 km deep · 43 km away
  58. 1.839 km W of Three Rocks, California · 18427 days ago · 11 km deep · 61 km away
  59. 3.57 km WSW of Gilroy, California · 18426 days ago · 4 km deep · 27 km away
  60. 1.922 km ENE of Soledad, California · 18426 days ago · 4 km deep · 44 km away

The first 60 of 182.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1029210. Read Tue, Sep 22, 2026, 9:34 PM UTC.