California earthquakes

M1.5 earthquake 8 km SW of Ridgemark, California

A magnitude 1.5 earthquake struck 8 km SW of Ridgemark, California on Fri, Jul 7, 1978, 2:25 PM PDT (21:25 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.1 9 km ESE of East Foothills, 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
1.5 (md), micro
Local time
UTC
1978-07-07 21:25:03 UTC
Depth
6.8 km (4.2 mi), shallow
Epicenter
36.746° N, 121.422° 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
±0.17
Depth from
From location
Station coverage gap
72°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 125 in the 60 days after this one and 65 in the 30 days before it.

After

  1. 2.44 km ESE of Aromas, California · 17615 days ago · 6 km deep · 21 km away
  2. 1.817 km E of East Foothills, California · 17613 days ago · 6 km deep · 70 km away
  3. 1.714 km E of Seven Trees, California · 17613 days ago · 2 km deep · 65 km away
  4. 2.43 km N of East Foothills, California · 17612 days ago · 0 km deep · 82 km away
  5. 2.94 km N of East Foothills, California · 17612 days ago · 1 km deep · 82 km away
  6. 1.74 km N of East Foothills, California · 17612 days ago · 1 km deep · 82 km away
  7. 2.011 km SE of Livermore, California · 17612 days ago · 3 km deep · 98 km away
  8. 1.511 km NE of East Foothills, California · 17611 days ago · 1 km deep · 82 km away
  9. 2.413 km SSE of Tres Pinos, California · 17611 days ago · 4 km deep · 15 km away
  10. 2.213 km SSE of Tres Pinos, California · 17611 days ago · 4 km deep · 15 km away
  11. 2.43 km SSW of San Juan Bautista, CA · 17609 days ago · 7 km deep · 14 km away
  12. 1.925 km SE of Tres Pinos, California · 17607 days ago · 15 km deep · 30 km away
  13. 2.02 km W of Cambrian Park, California · 17606 days ago · 7 km deep · 75 km away
  14. 2.65 km WSW of Gilroy, California · 17606 days ago · 6 km deep · 32 km away
  15. 1.92 km SSW of Cambrian Park, California · 17606 days ago · 5 km deep · 72 km away
  16. 1.611 km NW of Big Sur, California · 17605 days ago · 6 km deep · 63 km away
  17. 3.28 km NE of Interlaken, California · 17605 days ago · 5 km deep · 36 km away
  18. 1.711 km ESE of Seven Trees, California · 17604 days ago · 4 km deep · 63 km away
  19. 1.925 km ESE of Tres Pinos, California · 17603 days ago · 4 km deep · 32 km away
  20. 1.822 km NE of San Lucas, California · 17603 days ago · 7 km deep · 74 km away
  21. 2.413 km N of Morgan Hill, California · 17603 days ago · 5 km deep · 60 km away
  22. 1.622 km ENE of Soledad, California · 17603 days ago · 4 km deep · 39 km away
  23. 2.225 km NE of Soledad, California · 17602 days ago · 8 km deep · 32 km away
  24. 2.08 km ENE of San Martin, California · 17597 days ago · 7 km deep · 43 km away
  25. 1.92 km W of Tres Pinos, California · 17596 days ago · 2 km deep · 8 km away
  26. 2.09 km NNW of Hollister, California · 17596 days ago · 5 km deep · 21 km away
  27. 2.340 km SSW of South Dos Palos, California · 17596 days ago · 4 km deep · 51 km away
  28. 2.318 km SSE of Tres Pinos, California · 17595 days ago · 6 km deep · 20 km away
  29. 2.024 km NE of Greenfield, California · 17595 days ago · 4 km deep · 45 km away
  30. 2.03 km ESE of Tres Pinos, California · 17594 days ago · 9 km deep · 12 km away
  31. 2.217 km WSW of Lockwood, California · 17594 days ago · 12 km deep · 97 km away
  32. 1.621 km NE of Soledad, California · 17592 days ago · 7 km deep · 32 km away
  33. 2.025 km NE of Soledad, California · 17592 days ago · 12 km deep · 36 km away
  34. 1.72 km SW of Ridgemark, California · 17591 days ago · 7 km deep · 6 km away
  35. 1.818 km SSE of Tres Pinos, California · 17590 days ago · 7 km deep · 19 km away
  36. 1.926 km ESE of Tres Pinos, California · 17590 days ago · 0 km deep · 35 km away
  37. 1.632 km E of Tres Pinos, California · 17589 days ago · 1 km deep · 41 km away
  38. 1.65 km SSW of Gilroy, California · 17587 days ago · 6 km deep · 28 km away
  39. 1.512 km SE of Livermore, California · 17587 days ago · 4 km deep · 98 km away
  40. 2.330 km NE of Soledad, California · 17586 days ago · 6 km deep · 37 km away
  41. 2.023 km SSW of Volta, California · 17585 days ago · 5 km deep · 37 km away
  42. 1.824 km SE of Tres Pinos, California · 17585 days ago · 9 km deep · 29 km away
  43. 2.121 km NE of Soledad, California · 17584 days ago · 3 km deep · 31 km away
  44. 2.05 km SSE of Sunol, California · 17584 days ago · 8 km deep · 97 km away
  45. 1.624 km SE of Tres Pinos, California · 17584 days ago · 8 km deep · 29 km away
  46. 2.114 km SSE of Tres Pinos, California · 17583 days ago · 4 km deep · 15 km away
  47. 2.510 km SW of Ridgemark, California · 17582 days ago · 6 km deep · 4 km away
  48. 2.617 km SSE of Tres Pinos, California · 17582 days ago · 3 km deep · 19 km away
  49. 2.32 km NE of East Foothills, California · 17581 days ago · 0 km deep · 80 km away
  50. 2.46 km NE of East Foothills, California · 17581 days ago · 8 km deep · 80 km away
  51. 1.83 km NNW of Hollister, California · 17581 days ago · 7 km deep · 15 km away
  52. 1.929 km ENE of Soledad, California · 17580 days ago · 6 km deep · 41 km away
  53. 3.211 km S of Tres Pinos, California · 17580 days ago · 3 km deep · 11 km away
  54. 1.929 km ENE of Soledad, California · 17578 days ago · 6 km deep · 39 km away
  55. 1.71 km WSW of Tres Pinos, California · 17578 days ago · 6 km deep · 8 km away
  56. 1.523 km NNE of San Lucas, California · 17578 days ago · 4 km deep · 67 km away
  57. 1.810 km SE of Sunol, California · 17578 days ago · 5 km deep · 93 km away
  58. 1.624 km E of Tres Pinos, California · 17577 days ago · 0 km deep · 34 km away
  59. 2.421 km NE of Soledad, California · 17576 days ago · 5 km deep · 29 km away
  60. 1.67 km NNE of Corralitos, California · 17576 days ago · 13 km deep · 47 km away

The first 60 of 125.

Before

  1. 3.08 km NW of Hollister, California · 17616 days ago · 7 km deep · 18 km away
  2. 1.818 km SE of Big Sur, California · 17616 days ago · 12 km deep · 67 km away
  3. 3.07 km SSE of San Juan Bautista, California · 17617 days ago · 8 km deep · 9 km away
  4. 3.010 km S of Tres Pinos, California · 17617 days ago · 3 km deep · 10 km away
  5. 3.010 km S of Tres Pinos, California · 17617 days ago · 3 km deep · 10 km away
  6. 1.66 km E of Big Sur, California · 17618 days ago · 12 km deep · 61 km away
  7. 2.115 km SSE of Tres Pinos, California · 17619 days ago · 3 km deep · 17 km away
  8. 1.712 km ESE of East Foothills, California · 17619 days ago · 4 km deep · 69 km away
  9. 2.221 km NE of Soledad, California · 17620 days ago · 2 km deep · 32 km away
  10. 1.66 km ENE of Aromas, California · 17620 days ago · 7 km deep · 24 km away
  11. 3.210 km S of Tres Pinos, California · 17620 days ago · 4 km deep · 11 km away
  12. 1.89 km SSE of Davenport, California · 17621 days ago · 10 km deep · 67 km away
  13. 1.78 km NE of San Juan Bautista, California · 17621 days ago · 6 km deep · 19 km away
  14. 4.212 km S of Davenport, California · 17621 days ago · 11 km deep · 69 km away
  15. 2.512 km SSE of Davenport, California · 17621 days ago · 8 km deep · 68 km away
  16. 2.52 km NNW of Aromas, California · 17623 days ago · 10 km deep · 28 km away
  17. 2.110 km S of Tres Pinos, California · 17623 days ago · 3 km deep · 11 km away
  18. 2.210 km S of Tres Pinos, California · 17623 days ago · 4 km deep · 11 km away
  19. 2.022 km NE of Soledad, California · 17623 days ago · 2 km deep · 35 km away
  20. 2.322 km NE of Soledad, California · 17623 days ago · 3 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1040951. Read Tue, Sep 29, 2026, 4:51 PM UTC.