California earthquakes

M1.7 earthquake 6 km SSW of Ridgemark, California

A magnitude 1.7 earthquake struck 6 km SSW of Ridgemark, California on Sat, Mar 29, 1980, 11:28 AM PST (19:28 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.7 7 km SSE of San Juan Bautista, 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), micro
Local time
UTC
1980-03-29 19:28:43 UTC
Depth
7.9 km (4.9 mi), shallow
Epicenter
36.766° N, 121.401° 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, 0.5 km in depth
Magnitude uncertainty
±0.24
Depth from
From location
Station coverage gap
53°
Stations used
26

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 185 in the 60 days after this one and 102 in the 30 days before it.

After

  1. 1.811 km S of Tres Pinos, California · 16985 days ago · 3 km deep · 12 km away
  2. 1.824 km NE of Soledad, California · 16984 days ago · 11 km deep · 32 km away
  3. 1.69 km NE of Gilroy, California · 16984 days ago · 9 km deep · 35 km away
  4. 2.110 km E of San Martin, California · 16984 days ago · 10 km deep · 36 km away
  5. 2.98 km NE of Interlaken, California · 16984 days ago · 3 km deep · 36 km away
  6. 1.62 km NNW of Hollister, California · 16984 days ago · 4 km deep · 12 km away
  7. 1.814 km ENE of Gonzales, California · 16984 days ago · 8 km deep · 22 km away
  8. 1.714 km E of Seven Trees, California · 16983 days ago · 5 km deep · 65 km away
  9. 1.59 km NNW of Hollister, California · 16983 days ago · 4 km deep · 19 km away
  10. 1.59 km SW of Diablo Grande, California · 16982 days ago · 0 km deep · 63 km away
  11. 2.322 km NE of Soledad, California · 16982 days ago · 3 km deep · 31 km away
  12. 1.722 km NNE of Soledad, California · 16981 days ago · 2 km deep · 26 km away
  13. 2.37 km ENE of Gilroy, California · 16981 days ago · 4 km deep · 31 km away
  14. 2.223 km NE of San Ardo, California · 16981 days ago · 7 km deep · 86 km away
  15. 2.324 km NE of Greenfield, California · 16981 days ago · 5 km deep · 49 km away
  16. 1.724 km NE of Greenfield, California · 16981 days ago · 6 km deep · 48 km away
  17. 1.69 km NE of Gilroy, California · 16981 days ago · 8 km deep · 34 km away
  18. 2.224 km NE of Greenfield, California · 16981 days ago · 7 km deep · 48 km away
  19. 1.89 km ENE of Gilroy, California · 16980 days ago · 9 km deep · 32 km away
  20. 1.722 km NE of San Lucas, California · 16980 days ago · 7 km deep · 71 km away
  21. 2.22 km NNW of Aromas, California · 16980 days ago · 11 km deep · 28 km away
  22. 1.68 km SSE of San Juan Bautista, California · 16980 days ago · 6 km deep · 9 km away
  23. 1.64 km SSW of Tres Pinos, California · 16980 days ago · 4 km deep · 5 km away
  24. 1.95 km SW of Gilroy, California · 16980 days ago · 5 km deep · 31 km away
  25. 2.28 km N of Hollister, California · 16979 days ago · 9 km deep · 18 km away
  26. 1.6Central California · 16978 days ago · 7 km deep · 20 km away
  27. 2.13 km SSE of Loyola, California · 16978 days ago · 5 km deep · 87 km away
  28. 1.7Central California · 16978 days ago · 5 km deep · 15 km away
  29. 2.911 km S of Tres Pinos, California · 16977 days ago · 4 km deep · 12 km away
  30. 1.811 km SSW of Tres Pinos, California · 16977 days ago · 7 km deep · 9 km away
  31. 1.59 km SSW of Tres Pinos, California · 16977 days ago · 2 km deep · 7 km away
  32. 2.323 km NE of San Lucas, California · 16976 days ago · 8 km deep · 70 km away
  33. 2.09 km NE of Gilroy, California · 16976 days ago · 9 km deep · 35 km away
  34. 1.714 km SSE of Tres Pinos, California · 16976 days ago · 5 km deep · 17 km away
  35. 2.121 km NE of Soledad, California · 16976 days ago · 6 km deep · 32 km away
  36. 2.85 km SSE of San Juan Bautista, California · 16976 days ago · 7 km deep · 11 km away
  37. 1.917 km NE of East Foothills, California · 16976 days ago · 5 km deep · 85 km away
  38. 2.124 km NE of Greenfield, California · 16976 days ago · 6 km deep · 47 km away
  39. 1.68 km N of Morgan Hill, California · 16975 days ago · 5 km deep · 54 km away
  40. 1.89 km ESE of East Foothills, California · 16975 days ago · 8 km deep · 72 km away
  41. 2.022 km NE of Soledad, California · 16975 days ago · 3 km deep · 35 km away
  42. 2.22 km WSW of Hollister, California · 16974 days ago · 3 km deep · 9 km away
  43. 2.3Central California · 16974 days ago · 4 km deep · 12 km away
  44. 1.74 km N of Greenfield, California · 16973 days ago · 17 km deep · 47 km away
  45. 1.516 km SSE of Tres Pinos, California · 16972 days ago · 4 km deep · 17 km away
  46. 1.77 km NNE of Hollister, California · 16972 days ago · 6 km deep · 17 km away
  47. 2.017 km SSE of Tres Pinos, California · 16972 days ago · 6 km deep · 19 km away
  48. 1.93 km NW of Carmel Valley Village, California · 16972 days ago · 15 km deep · 44 km away
  49. 1.821 km SW of Three Rocks, California · 16971 days ago · 15 km deep · 86 km away
  50. 1.58 km ENE of San Martin, California · 16971 days ago · 8 km deep · 41 km away
  51. 1.823 km NE of San Ardo, California · 16971 days ago · 7 km deep · 86 km away
  52. 4.77 km SSE of San Juan Bautista, California · 16971 days ago · 8 km deep · 10 km away
  53. 1.86 km SSE of San Juan Bautista, California · 16971 days ago · 7 km deep · 10 km away
  54. 3.25 km SSE of San Juan Bautista, California · 16971 days ago · 7 km deep · 11 km away
  55. 1.95 km SSE of San Juan Bautista, California · 16971 days ago · 7 km deep · 11 km away
  56. 1.64 km SSE of San Juan Bautista, California · 16971 days ago · 6 km deep · 11 km away
  57. 1.5Central California · 16971 days ago · 6 km deep · 9 km away
  58. 2.97 km SSE of San Juan Bautista, California · 16971 days ago · 6 km deep · 8 km away
  59. 2.05 km SSE of San Juan Bautista, California · 16971 days ago · 7 km deep · 11 km away
  60. 3.28 km SSE of San Juan Bautista, California · 16971 days ago · 6 km deep · 8 km away

The first 60 of 185.

Before

  1. 1.91 km WSW of Ridgemark, California · 16986 days ago · 7 km deep · 5 km away
  2. 1.85 km NE of Big Sur, California · 16986 days ago · 11 km deep · 61 km away
  3. 2.3Central California · 16987 days ago · 7 km deep · 55 km away
  4. 1.95 km SSW of Gilroy, California · 16987 days ago · 6 km deep · 27 km away
  5. 1.7Central California · 16988 days ago · 3 km deep · 51 km away
  6. 1.624 km NE of Greenfield, CA · 16988 days ago · 8 km deep · 45 km away
  7. 1.623 km ENE of San Lucas, California · 16988 days ago · 6 km deep · 80 km away
  8. 2.610 km ESE of East Foothills, California · 16990 days ago · 7 km deep · 70 km away
  9. 2.636 km NW of San Simeon, California · 16991 days ago · 6 km deep · 100 km away
  10. 1.811 km NNW of Hollister, California · 16991 days ago · 4 km deep · 21 km away
  11. 1.94 km ESE of Sunol, California · 16991 days ago · 9 km deep · 98 km away
  12. 2.24 km ESE of Sunol, California · 16991 days ago · 8 km deep · 98 km away
  13. 1.59 km NE of San Martin, California · 16992 days ago · 7 km deep · 44 km away
  14. 1.916 km NNE of Soledad, California · 16992 days ago · 9 km deep · 25 km away
  15. 2.06 km SE of Alum Rock, California · 16994 days ago · 3 km deep · 70 km away
  16. 1.83 km N of East Foothills, California · 16994 days ago · 1 km deep · 81 km away
  17. 1.623 km NE of San Ardo, California · 16994 days ago · 3 km deep · 86 km away
  18. 1.85 km SSW of Ridgemark, California · 16994 days ago · 8 km deep · 1 km away
  19. 1.57 km E of Gilroy, California · 16994 days ago · 5 km deep · 29 km away
  20. 1.58 km N of Hollister, California · 16994 days ago · 8 km deep · 18 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1051813. Read Wed, Sep 30, 2026, 7:38 AM UTC.