California earthquakes

M1.7 earthquake 2 km SW of Ridgemark, California

A magnitude 1.7 earthquake struck 2 km SW of Ridgemark, California on Fri, Dec 12, 1980, 6:52 PM PST (02:52 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.8 7 km E 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
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1980-12-13 02:52:57 UTC
Depth
7.8 km (4.9 mi), shallow
Epicenter
36.797° N, 121.388° 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, 0.6 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
30°
Stations used
32

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 181 in the 60 days after this one and 82 in the 30 days before it.

After

  1. 3.023 km ENE of Soledad, California · 16732 days ago · 5 km deep · 41 km away
  2. 2.622 km ENE of Soledad, California · 16732 days ago · 5 km deep · 41 km away
  3. 2.817 km SSE of Tres Pinos, California · 16732 days ago · 8 km deep · 21 km away
  4. 1.517 km SSE of Tres Pinos, California · 16732 days ago · 8 km deep · 21 km away
  5. 1.922 km ENE of Soledad, California · 16732 days ago · 5 km deep · 41 km away
  6. 3.01 km ENE of Aromas, California · 16731 days ago · 6 km deep · 24 km away
  7. 1.921 km SSE of Tres Pinos, California · 16731 days ago · 6 km deep · 25 km away
  8. 1.721 km SSE of Tres Pinos, California · 16731 days ago · 5 km deep · 26 km away
  9. 1.921 km SSE of Tres Pinos, California · 16731 days ago · 6 km deep · 25 km away
  10. 1.721 km NE of Soledad, California · 16730 days ago · 6 km deep · 34 km away
  11. 2.111 km S of Tres Pinos, California · 16730 days ago · 5 km deep · 14 km away
  12. 1.95 km N of Diablo Grande, California · 16729 days ago · 4 km deep · 73 km away
  13. 2.824 km NE of Greenfield, California · 16729 days ago · 7 km deep · 48 km away
  14. 2.224 km NE of Greenfield, California · 16729 days ago · 6 km deep · 48 km away
  15. 1.938 km SSW of South Dos Palos, California · 16729 days ago · 1 km deep · 51 km away
  16. 1.912 km S of Tres Pinos, California · 16729 days ago · 4 km deep · 16 km away
  17. 1.96 km NNE of East Foothills, California · 16727 days ago · 4 km deep · 80 km away
  18. 1.77 km NE of San Martin, California · 16727 days ago · 7 km deep · 39 km away
  19. 2.02 km S of Loyola, California · 16726 days ago · 0 km deep · 87 km away
  20. 1.718 km E of Tres Pinos, California · 16725 days ago · 5 km deep · 24 km away
  21. 1.615 km E of Seven Trees, California · 16724 days ago · 4 km deep · 60 km away
  22. 2.124 km ENE of Soledad, California · 16724 days ago · 3 km deep · 44 km away
  23. 1.624 km NE of Greenfield, California · 16724 days ago · 5 km deep · 48 km away
  24. 2.45 km NE of Hollister, California · 16723 days ago · 8 km deep · 11 km away
  25. 2.017 km SSE of Tres Pinos, California · 16723 days ago · 3 km deep · 21 km away
  26. 1.99 km NE of Gilroy, California · 16723 days ago · 9 km deep · 31 km away
  27. 2.526 km ENE of Soledad, California · 16723 days ago · 7 km deep · 45 km away
  28. 1.9Northern California · 16723 days ago · 3 km deep · 46 km away
  29. 2.626 km ENE of Soledad, California · 16723 days ago · 7 km deep · 45 km away
  30. 1.626 km NE of Greenfield, California · 16722 days ago · 6 km deep · 46 km away
  31. 1.726 km NE of Greenfield, California · 16721 days ago · 6 km deep · 45 km away
  32. 1.924 km NE of Greenfield, California · 16721 days ago · 5 km deep · 48 km away
  33. 1.724 km NE of Greenfield, California · 16720 days ago · 6 km deep · 48 km away
  34. 1.66 km ENE of East Foothills, California · 16720 days ago · 9 km deep · 75 km away
  35. 3.410 km NNW of Hollister, California · 16720 days ago · 3 km deep · 17 km away
  36. 3.210 km NNW of Hollister, California · 16720 days ago · 3 km deep · 17 km away
  37. 1.615 km E of Seven Trees, California · 16719 days ago · 8 km deep · 60 km away
  38. 1.68 km NE of Gilroy, California · 16718 days ago · 5 km deep · 30 km away
  39. 1.627 km NNE of King City, California · 16718 days ago · -1 km deep · 56 km away
  40. 2.325 km ENE of Greenfield, California · 16718 days ago · 1 km deep · 54 km away
  41. 2.010 km NNW of Hollister, California · 16717 days ago · 1 km deep · 17 km away
  42. 1.918 km S of Tracy, California · 16716 days ago · 0 km deep · 86 km away
  43. 1.5Northern California · 16712 days ago · 7 km deep · 61 km away
  44. 1.818 km ENE of East Foothills, California · 16712 days ago · 8 km deep · 77 km away
  45. 2.15 km NE of East Foothills, California · 16712 days ago · 7 km deep · 76 km away
  46. 1.99 km NE of Gilroy, California · 16710 days ago · 9 km deep · 32 km away
  47. 2.214 km ENE of Greenfield, California · 16710 days ago · 20 km deep · 53 km away
  48. 1.615 km E of Seven Trees, California · 16710 days ago · 2 km deep · 60 km away
  49. 2.27 km SSE of San Juan Bautista, California · 16708 days ago · 10 km deep · 11 km away
  50. 1.615 km SE of Livermore, California · 16708 days ago · 2 km deep · 89 km away
  51. 1.56 km NE of East Foothills, California · 16708 days ago · 7 km deep · 76 km away
  52. 2.012 km ESE of Big Sur, California · 16707 days ago · 12 km deep · 71 km away
  53. 1.78 km SE of Lexington Hills, California · 16707 days ago · 13 km deep · 58 km away
  54. 2.914 km SSE of Tres Pinos, California · 16707 days ago · 3 km deep · 18 km away
  55. 1.94 km NE of San Lucas, California · 16707 days ago · 79 km deep · 80 km away
  56. 4.52 km SE of Aromas, California · 16706 days ago · 9 km deep · 22 km away
  57. 1.91 km ESE of Aromas, California · 16706 days ago · 8 km deep · 23 km away
  58. 1.61 km ESE of Aromas, California · 16706 days ago · 8 km deep · 23 km away
  59. 1.712 km SE of Sunol, California · 16706 days ago · 5 km deep · 88 km away
  60. 3.04 km SE of Aromas, California · 16706 days ago · 8 km deep · 20 km away

The first 60 of 181.

Before

  1. 1.724 km NE of Greenfield, California · 16732 days ago · 6 km deep · 48 km away
  2. 1.710 km NNW of Hollister, California · 16732 days ago · 6 km deep · 16 km away
  3. 2.421 km SSE of Tres Pinos, California · 16733 days ago · 6 km deep · 26 km away
  4. 1.67 km WNW of Moss Landing, California · 16733 days ago · 6 km deep · 42 km away
  5. 1.78 km N of Hollister, California · 16733 days ago · 9 km deep · 15 km away
  6. 1.734 km WNW of Three Rocks, California · 16733 days ago · 11 km deep · 60 km away
  7. 1.615 km SE of Livermore, California · 16734 days ago · 4 km deep · 91 km away
  8. 1.624 km NE of Greenfield, California · 16735 days ago · 5 km deep · 51 km away
  9. 1.99 km ENE of Milpitas, California · 16736 days ago · 7 km deep · 84 km away
  10. 1.9Northern California · 16736 days ago · 7 km deep · 77 km away
  11. 1.925 km W of Lockwood, California · 16736 days ago · 6 km deep · 95 km away
  12. 1.620 km NE of San Ardo, California · 16736 days ago · -1 km deep · 90 km away
  13. 2.024 km NE of Greenfield, California · 16737 days ago · 6 km deep · 49 km away
  14. 1.922 km NNE of Soledad, California · 16737 days ago · 2 km deep · 27 km away
  15. 1.822 km ENE of Soledad, California · 16737 days ago · 3 km deep · 38 km away
  16. 1.625 km ENE of King City, California · 16738 days ago · 10 km deep · 68 km away
  17. 1.631 km ENE of Soledad, California · 16739 days ago · 8 km deep · 40 km away
  18. 2.08 km SW of Tres Pinos, California · 16740 days ago · 3 km deep · 7 km away
  19. 1.626 km ENE of Greenfield, California · 16741 days ago · 1 km deep · 53 km away
  20. 1.940 km W of Lockwood, California · 16741 days ago · 17 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1058085. Read Sun, Oct 4, 2026, 8:49 PM UTC.