California earthquakes

M1.7 earthquake 8 km NE of Ridgemark, California

A magnitude 1.7 earthquake struck 8 km NE of Ridgemark, California on Wed, Oct 6, 1976, 6:28 AM PDT (13:28 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.6 20 km SSE of Tres Pinos, 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
1976-10-06 13:28:30 UTC
Depth
2.9 km (1.8 mi), shallow
Epicenter
36.864° N, 121.294° 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, 0.6 km in depth
Magnitude uncertainty
±0.36
Depth from
From location
Station coverage gap
122°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 179 in the 60 days after this one and 109 in the 30 days before it.

After

  1. 2.16 km S of Volta, California · 18257 days ago · 10 km deep · 37 km away
  2. 2.09 km NW of Hollister, California · 18257 days ago · 4 km deep · 17 km away
  3. 3.313 km S of Tracy, California · 18257 days ago · 3 km deep · 84 km away
  4. 1.96 km SE of Lexington Hills, California · 18257 days ago · 12 km deep · 62 km away
  5. 1.68 km S of Livermore, California · 18256 days ago · 5 km deep · 93 km away
  6. 1.87 km NNE of Interlaken, California · 18256 days ago · 5 km deep · 41 km away
  7. 2.321 km NE of Soledad, California · 18256 days ago · 5 km deep · 34 km away
  8. 3.424 km NE of Greenfield, California · 18256 days ago · 5 km deep · 49 km away
  9. 2.4Central California · 18256 days ago · 5 km deep · 25 km away
  10. 1.77 km NNE of Interlaken, California · 18255 days ago · 6 km deep · 40 km away
  11. 2.79 km S of Tres Pinos, California · 18254 days ago · 2 km deep · 18 km away
  12. 2.014 km E of Seven Trees, California · 18254 days ago · 5 km deep · 59 km away
  13. 2.424 km NE of Greenfield, California · 18254 days ago · 1 km deep · 50 km away
  14. 1.7Central California · 18254 days ago · 7 km deep · 10 km away
  15. 2.424 km NE of Greenfield, California · 18254 days ago · 1 km deep · 51 km away
  16. 3.217 km SSE of Tres Pinos, California · 18254 days ago · 5 km deep · 25 km away
  17. 2.323 km NE of Greenfield, California · 18253 days ago · 4 km deep · 50 km away
  18. 1.623 km NE of Soledad, California · 18252 days ago · 7 km deep · 37 km away
  19. 2.825 km ENE of Greenfield, California · 18251 days ago · 1 km deep · 54 km away
  20. 1.917 km NE of East Foothills, California · 18251 days ago · 7 km deep · 78 km away
  21. 2.523 km NE of Greenfield, California · 18251 days ago · 7 km deep · 49 km away
  22. 1.610 km E of Seven Trees, California · 18251 days ago · 6 km deep · 61 km away
  23. 3.321 km NE of Soledad, California · 18250 days ago · 4 km deep · 33 km away
  24. 2.323 km NE of King City, California · 18250 days ago · 3 km deep · 65 km away
  25. 1.88 km NE of San Juan Bautista, California · 18250 days ago · 6 km deep · 17 km away
  26. 1.617 km NE of East Foothills, California · 18249 days ago · 7 km deep · 78 km away
  27. 2.314 km SSE of Tres Pinos, California · 18249 days ago · 4 km deep · 22 km away
  28. 1.87 km NE of San Juan Bautista, California · 18249 days ago · 4 km deep · 17 km away
  29. 2.421 km NE of Soledad, California · 18248 days ago · 3 km deep · 35 km away
  30. 2.98 km NE of Gilroy, California · 18248 days ago · 5 km deep · 30 km away
  31. 2.55 km ENE of Interlaken, California · 18248 days ago · 10 km deep · 36 km away
  32. 2.115 km E of Seven Trees, California · 18247 days ago · 2 km deep · 57 km away
  33. 2.911 km SE of Sunol, California · 18246 days ago · 5 km deep · 86 km away
  34. 3.32 km SW of San Juan Bautista, California · 18246 days ago · 4 km deep · 24 km away
  35. 2.830 km WSW of Three Rocks, California · 18246 days ago · 15 km deep · 73 km away
  36. 1.616 km NE of East Foothills, California · 18245 days ago · 7 km deep · 77 km away
  37. 1.820 km W of Westley, California · 18245 days ago · 0 km deep · 76 km away
  38. 3.7Central California · 18245 days ago · 6 km deep · 23 km away
  39. 2.82 km SSW of San Juan Bautista, California · 18245 days ago · 6 km deep · 23 km away
  40. 2.623 km ENE of Soledad, California · 18245 days ago · 4 km deep · 46 km away
  41. 2.320 km NE of Soledad, California · 18245 days ago · 7 km deep · 37 km away
  42. 1.8Central California · 18245 days ago · 4 km deep · 44 km away
  43. 1.63 km SSE of Portola Valley, California · 18245 days ago · 10 km deep · 99 km away
  44. 1.63 km SSE of Portola Valley, California · 18245 days ago · 10 km deep · 98 km away
  45. 1.9Central California · 18244 days ago · 6 km deep · 2 km away
  46. 3.828 km SW of South Dos Palos, California · 18244 days ago · 5 km deep · 38 km away
  47. 2.416 km SSE of Tres Pinos, California · 18244 days ago · 5 km deep · 24 km away
  48. 1.916 km SSE of Tres Pinos, California · 18244 days ago · 5 km deep · 24 km away
  49. 2.115 km SSE of Tres Pinos, California · 18244 days ago · 6 km deep · 24 km away
  50. 1.71 km E of Campbell, California · 18244 days ago · 3 km deep · 74 km away
  51. 1.66 km SSW of Gonzales, California · 18243 days ago · 14 km deep · 49 km away
  52. 2.28 km NW of Hollister, California · 18243 days ago · 6 km deep · 17 km away
  53. 2.210 km SSE of Tres Pinos, California · 18243 days ago · 5 km deep · 18 km away
  54. 2.624 km NNE of San Lucas, California · 18243 days ago · 8 km deep · 70 km away
  55. 2.623 km NE of San Lucas, California · 18242 days ago · 7 km deep · 74 km away
  56. 2.68 km SSW of Tres Pinos, California · 18242 days ago · 2 km deep · 17 km away
  57. 2.221 km NE of Soledad, California · 18242 days ago · 3 km deep · 38 km away
  58. 1.619 km SSE of Tres Pinos, California · 18241 days ago · 5 km deep · 27 km away
  59. 3.58 km NW of Hollister, California · 18240 days ago · 7 km deep · 16 km away
  60. 3.83 km SE of Aromas, California · 18240 days ago · 8 km deep · 28 km away

The first 60 of 179.

Before

  1. 1.922 km ESE of Tres Pinos, California · 18258 days ago · 5 km deep · 23 km away
  2. 1.65 km NE of East Foothills, California · 18258 days ago · 3 km deep · 75 km away
  3. 2.923 km NE of King City, California · 18259 days ago · 6 km deep · 62 km away
  4. 1.930 km SSW of South Dos Palos, California · 18259 days ago · 11 km deep · 46 km away
  5. 2.04 km SE of Tres Pinos, California · 18260 days ago · 9 km deep · 11 km away
  6. 2.23 km SSW of Los Altos Hills, California · 18260 days ago · 6 km deep · 93 km away
  7. 2.13 km SSW of Los Altos Hills, California · 18260 days ago · 5 km deep · 93 km away
  8. 2.05 km NNE of Tres Pinos, California · 18260 days ago · 6 km deep · 3 km away
  9. 2.17 km NNE of Interlaken, California · 18260 days ago · 6 km deep · 41 km away
  10. 2.17 km NNE of Interlaken, California · 18261 days ago · 6 km deep · 41 km away
  11. 3.011 km S of Tres Pinos, California · 18262 days ago · 2 km deep · 20 km away
  12. 3.126 km NE of Soledad, California · 18262 days ago · 7 km deep · 37 km away
  13. 1.96 km ENE of Interlaken, California · 18263 days ago · 10 km deep · 35 km away
  14. 1.625 km SE of Tres Pinos, California · 18263 days ago · 5 km deep · 31 km away
  15. 1.82 km E of Aromas, California · 18263 days ago · 4 km deep · 29 km away
  16. 2.425 km NNE of King City, California · 18263 days ago · 1 km deep · 59 km away
  17. 1.713 km N of Morgan Hill, California · 18263 days ago · 7 km deep · 53 km away
  18. 2.119 km ENE of East Foothills, California · 18263 days ago · 8 km deep · 69 km away
  19. 2.216 km SSE of Tres Pinos, California · 18263 days ago · 6 km deep · 24 km away
  20. 2.622 km ENE of Soledad, California · 18263 days ago · 3 km deep · 40 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1031802. Read Fri, Oct 2, 2026, 12:45 AM UTC.