California earthquakes

M1.8 earthquake 4 km W of Ridgemark, California

A magnitude 1.8 earthquake struck 4 km W of Ridgemark, California on Sat, Jan 7, 1978, 5:16 AM PST (13:16 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.4 21 km NNE of Soledad, 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
1.8 (md), micro
Local time
UTC
1978-01-07 13:16:45 UTC
Depth
3.4 km (2.1 mi), shallow
Epicenter
36.806° N, 121.420° 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 0.1 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.21
Depth from
From location
Station coverage gap
37°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 129 in the 60 days after this one and 87 in the 30 days before it.

After

  1. 2.014 km E of Tres Pinos, California · 17798 days ago · 5 km deep · 24 km away
  2. 1.614 km E of Seven Trees, California · 17797 days ago · 2 km deep · 59 km away
  3. 2.318 km SSW of Three Rocks, California · 17796 days ago · 9 km deep · 100 km away
  4. 1.99 km NE of San Juan Bautista, California · 17796 days ago · 3 km deep · 13 km away
  5. 3.014 km SSE of Tres Pinos, California · 17795 days ago · 3 km deep · 21 km away
  6. 1.821 km NE of Soledad, California · 17794 days ago · 6 km deep · 40 km away
  7. 1.621 km NE of Soledad, California · 17794 days ago · 3 km deep · 35 km away
  8. 2.65 km NE of Amesti, California · 17793 days ago · 12 km deep · 36 km away
  9. 2.12 km SW of Los Altos Hills, California · 17791 days ago · 7 km deep · 90 km away
  10. 1.88 km SSW of Ridgemark, California · 17791 days ago · 6 km deep · 8 km away
  11. 2.722 km ENE of Soledad, California · 17791 days ago · 3 km deep · 40 km away
  12. 1.62 km SSW of San Juan Bautista, California · 17791 days ago · 4 km deep · 12 km away
  13. 1.522 km ENE of Soledad, California · 17790 days ago · 1 km deep · 42 km away
  14. 3.421 km NNE of Soledad, California · 17790 days ago · 6 km deep · 32 km away
  15. 2.421 km NE of Soledad, California · 17790 days ago · 6 km deep · 32 km away
  16. 1.721 km NNE of Soledad, California · 17790 days ago · 6 km deep · 31 km away
  17. 2.05 km SSW of Tres Pinos, California · 17790 days ago · 8 km deep · 10 km away
  18. 2.422 km NE of Soledad, California · 17788 days ago · 6 km deep · 32 km away
  19. 1.915 km S of Tres Pinos, California · 17788 days ago · 10 km deep · 19 km away
  20. 2.322 km ENE of Tres Pinos, California · 17787 days ago · 5 km deep · 31 km away
  21. 2.45 km SW of Gilroy, California · 17787 days ago · 7 km deep · 25 km away
  22. 1.824 km NE of Greenfield, California · 17786 days ago · 0 km deep · 53 km away
  23. 2.17 km SSE of Gilroy, California · 17785 days ago · 5 km deep · 19 km away
  24. 1.921 km SW of Diablo Grande, California · 17784 days ago · 7 km deep · 54 km away
  25. 2.03 km W of San Juan Bautista, California · 17784 days ago · 6 km deep · 15 km away
  26. 1.524 km ENE of Soledad, California · 17784 days ago · 3 km deep · 46 km away
  27. 2.826 km NE of Soledad, California · 17783 days ago · 9 km deep · 41 km away
  28. 1.626 km NE of Soledad, California · 17783 days ago · 9 km deep · 41 km away
  29. 1.621 km NE of Soledad, California · 17782 days ago · 4 km deep · 39 km away
  30. 1.815 km SW of Soledad, California · 17781 days ago · 13 km deep · 55 km away
  31. 2.225 km SE of Tres Pinos, California · 17781 days ago · 10 km deep · 34 km away
  32. 1.915 km SW of Soledad, California · 17781 days ago · 11 km deep · 55 km away
  33. 1.628 km ENE of Soledad, California · 17781 days ago · 10 km deep · 41 km away
  34. 1.817 km SW of Soledad, California · 17781 days ago · 15 km deep · 57 km away
  35. 1.58 km NE of Gilroy, California · 17781 days ago · 10 km deep · 29 km away
  36. 2.25 km NE of San Juan Bautista, California · 17778 days ago · 4 km deep · 10 km away
  37. 2.023 km NE of San Ardo, California · 17777 days ago · 7 km deep · 90 km away
  38. 1.74 km SSE of San Juan Bautista, California · 17776 days ago · 5 km deep · 10 km away
  39. 1.618 km SSE of Tres Pinos, California · 17776 days ago · 7 km deep · 25 km away
  40. 1.89 km ESE of Gilroy, California · 17776 days ago · 5 km deep · 20 km away
  41. 2.49 km ESE of Gilroy, California · 17776 days ago · 6 km deep · 20 km away
  42. 2.321 km NNE of Soledad, California · 17776 days ago · 6 km deep · 32 km away
  43. 1.79 km ESE of Gilroy, California · 17776 days ago · 5 km deep · 20 km away
  44. 2.221 km NE of Soledad, California · 17775 days ago · 5 km deep · 33 km away
  45. 1.822 km ENE of San Lucas, California · 17775 days ago · 4 km deep · 86 km away
  46. 1.922 km ENE of San Lucas, California · 17775 days ago · 7 km deep · 85 km away
  47. 1.526 km NE of Soledad, California · 17775 days ago · 8 km deep · 41 km away
  48. 2.123 km NE of King City, California · 17775 days ago · 7 km deep · 64 km away
  49. 1.615 km SW of Soledad, California · 17775 days ago · 11 km deep · 55 km away
  50. 2.112 km S of Tres Pinos, California · 17774 days ago · 2 km deep · 18 km away
  51. 1.921 km NE of Soledad, California · 17773 days ago · 8 km deep · 39 km away
  52. 1.723 km ENE of Soledad, California · 17773 days ago · 3 km deep · 44 km away
  53. 1.626 km NE of Soledad, California · 17773 days ago · 8 km deep · 41 km away
  54. 1.521 km SSE of Tres Pinos, California · 17773 days ago · 5 km deep · 27 km away
  55. 1.85 km WSW of Gilroy, California · 17772 days ago · 2 km deep · 26 km away
  56. 1.834 km SSW of South Dos Palos, California · 17771 days ago · 10 km deep · 55 km away
  57. 2.49 km SW of Tres Pinos, California · 17771 days ago · 6 km deep · 9 km away
  58. 1.924 km ENE of Greenfield, California · 17770 days ago · 5 km deep · 55 km away
  59. 2.426 km NE of Greenfield, California · 17770 days ago · 7 km deep · 52 km away
  60. 1.724 km NE of Greenfield, California · 17769 days ago · 0 km deep · 54 km away

The first 60 of 129.

Before

  1. 1.922 km NE of San Lucas, California · 17799 days ago · 7 km deep · 79 km away
  2. 3.026 km NE of Greenfield, California · 17799 days ago · 8 km deep · 52 km away
  3. 1.612 km SW of Tres Pinos, California · 17799 days ago · 9 km deep · 12 km away
  4. 3.112 km SW of Tres Pinos, California · 17799 days ago · 9 km deep · 12 km away
  5. 1.812 km SW of Tres Pinos, California · 17799 days ago · 8 km deep · 12 km away
  6. 1.823 km NE of San Lucas, California · 17799 days ago · 6 km deep · 75 km away
  7. 1.626 km NE of Soledad, California · 17800 days ago · 8 km deep · 39 km away
  8. 3.010 km NNW of Hollister, California · 17800 days ago · 2 km deep · 15 km away
  9. 1.68 km SSW of Ridgemark, California · 17800 days ago · 6 km deep · 7 km away
  10. 1.821 km NE of Soledad, California · 17802 days ago · 7 km deep · 32 km away
  11. 1.624 km NE of Greenfield, California · 17802 days ago · 5 km deep · 48 km away
  12. 2.54 km SW of Tres Pinos, California · 17802 days ago · 13 km deep · 8 km away
  13. 2.53 km S of San Juan Bautista, California · 17803 days ago · 7 km deep · 10 km away
  14. 1.621 km NNE of Soledad, California · 17803 days ago · 4 km deep · 32 km away
  15. 1.812 km SW of Tres Pinos, California · 17803 days ago · 8 km deep · 12 km away
  16. 2.127 km ENE of Soledad, California · 17804 days ago · 9 km deep · 42 km away
  17. 3.1Central California · 17804 days ago · 9 km deep · 41 km away
  18. 2.022 km ENE of Tres Pinos, California · 17804 days ago · 6 km deep · 31 km away
  19. 2.1Central California · 17804 days ago · 4 km deep · 31 km away
  20. 2.6Central California · 17804 days ago · 6 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038499. Read Wed, Sep 30, 2026, 12:09 PM UTC.