California earthquakes

M1.9 earthquake 2 km WNW of Ridgemark, California

A magnitude 1.9 earthquake struck 2 km WNW of Ridgemark, California on Sun, Dec 9, 1979, 12:50 AM PST (08:50 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.0 9 km NE of Gilroy, 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
1.9 (md), micro
Local time
UTC
1979-12-09 08:50:28 UTC
Depth
6.4 km (4.0 mi), shallow
Epicenter
36.818° N, 121.389° 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, 0.8 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
70°
Stations used
18

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 0 in the 30 days before it.

After

  1. 1.88 km ENE of Gilroy, California · 17083 days ago · 6 km deep · 26 km away
  2. 1.718 km W of Volta, California · 17082 days ago · 6 km deep · 38 km away
  3. 3.09 km NE of Gilroy, California · 17081 days ago · 7 km deep · 29 km away
  4. 3.19 km NE of Gilroy, California · 17081 days ago · 7 km deep · 29 km away
  5. 1.67 km ESE of Gilroy, California · 17081 days ago · 9 km deep · 20 km away
  6. 2.13 km NNW of Hollister, California · 17081 days ago · 7 km deep · 8 km away
  7. 1.97 km NW of Davenport, California · 17080 days ago · 16 km deep · 82 km away
  8. 1.811 km SSE of Livermore, California · 17080 days ago · 5 km deep · 90 km away
  9. 2.09 km NE of Gilroy, California · 17080 days ago · 9 km deep · 29 km away
  10. 2.24 km ESE of Interlaken, California · 17080 days ago · 11 km deep · 29 km away
  11. 1.88 km NNE of East Foothills, California · 17080 days ago · 4 km deep · 78 km away
  12. 1.65 km SW of Gilroy, California · 17079 days ago · 4 km deep · 26 km away
  13. 1.622 km NNE of Soledad, California · 17079 days ago · 9 km deep · 28 km away
  14. 1.55 km SSW of Gilroy, California · 17079 days ago · 4 km deep · 24 km away
  15. 2.42 km S of San Juan Bautista, California · 17078 days ago · 5 km deep · 14 km away
  16. 2.121 km SSE of Tres Pinos, California · 17078 days ago · 5 km deep · 27 km away
  17. 2.020 km SSE of Tres Pinos, California · 17078 days ago · 6 km deep · 26 km away
  18. 2.120 km SSE of Tres Pinos, California · 17078 days ago · 5 km deep · 26 km away
  19. 2.120 km SSE of Tres Pinos, California · 17078 days ago · 5 km deep · 26 km away
  20. 1.87 km ENE of East Foothills, California · 17078 days ago · 5 km deep · 74 km away
  21. 2.08 km E of East Foothills, California · 17078 days ago · 8 km deep · 69 km away
  22. 2.33 km WSW of Cupertino, California · 17078 days ago · 5 km deep · 81 km away
  23. 1.823 km ENE of Soledad, California · 17077 days ago · 1 km deep · 41 km away
  24. 1.621 km NE of Soledad, California · 17076 days ago · 8 km deep · 38 km away
  25. 1.616 km E of Seven Trees, California · 17076 days ago · 7 km deep · 57 km away
  26. 2.321 km NE of Soledad, California · 17076 days ago · 6 km deep · 36 km away
  27. 3.39 km S of Tres Pinos, California · 17076 days ago · 3 km deep · 13 km away
  28. 1.99 km SSW of Tres Pinos, California · 17076 days ago · 2 km deep · 13 km away
  29. 1.79 km SSW of Tres Pinos, California · 17075 days ago · 3 km deep · 13 km away
  30. 3.84 km SW of Davenport, California · 17074 days ago · 14 km deep · 77 km away
  31. 2.25 km SSW of Gilroy, California · 17073 days ago · 4 km deep · 24 km away
  32. 2.45 km SSW of Gilroy, California · 17073 days ago · 4 km deep · 24 km away
  33. 1.618 km E of East Foothills, California · 17073 days ago · 4 km deep · 63 km away
  34. 2.211 km ESE of East Foothills, California · 17073 days ago · 7 km deep · 64 km away
  35. 1.83 km ESE of Aromas, California · 17073 days ago · 7 km deep · 20 km away
  36. 2.49 km ENE of Gilroy, California · 17072 days ago · 9 km deep · 26 km away
  37. 2.09 km NE of Gilroy, California · 17071 days ago · 9 km deep · 30 km away
  38. 1.817 km ENE of East Foothills, California · 17070 days ago · 6 km deep · 71 km away
  39. 1.59 km NE of Gilroy, California · 17069 days ago · 9 km deep · 30 km away
  40. 1.623 km NE of King City, California · 17069 days ago · 4 km deep · 67 km away
  41. 1.96 km NE of East Foothills, California · 17069 days ago · 8 km deep · 76 km away
  42. 2.924 km NE of Greenfield, California · 17069 days ago · 7 km deep · 50 km away
  43. 2.44 km ESE of Lexington Hills, California · 17069 days ago · 11 km deep · 60 km away
  44. 1.98 km ENE of San Martin, California · 17069 days ago · 7 km deep · 35 km away
  45. 1.724 km NE of Greenfield, California · 17068 days ago · 6 km deep · 50 km away
  46. 1.79 km S of Tres Pinos, California · 17068 days ago · 2 km deep · 13 km away
  47. 2.49 km S of Tres Pinos, California · 17068 days ago · 2 km deep · 13 km away
  48. 2.69 km ENE of Gilroy, California · 17068 days ago · 7 km deep · 24 km away
  49. 2.424 km NE of Greenfield, California · 17068 days ago · 5 km deep · 51 km away
  50. 2.024 km NE of Greenfield, California · 17068 days ago · 4 km deep · 51 km away
  51. 1.611 km S of Tres Pinos, California · 17068 days ago · 8 km deep · 15 km away
  52. 2.224 km NE of Greenfield, California · 17068 days ago · 6 km deep · 50 km away
  53. 1.924 km NE of Soledad, California · 17068 days ago · 9 km deep · 37 km away
  54. 2.3Central California · 17068 days ago · 5 km deep · 30 km away
  55. 2.126 km ESE of Big Sur, California · 17067 days ago · 5 km deep · 75 km away
  56. 1.88 km ENE of Gilroy, California · 17067 days ago · 5 km deep · 27 km away
  57. 1.924 km NE of Greenfield, California · 17067 days ago · 6 km deep · 51 km away
  58. 3.622 km NE of San Lucas, California · 17066 days ago · 6 km deep · 81 km away
  59. 3.222 km NE of San Lucas, California · 17066 days ago · 10 km deep · 81 km away
  60. 1.924 km NE of Greenfield, California · 17066 days ago · 6 km deep · 50 km away

The first 60 of 181.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1049241. Read Tue, Sep 22, 2026, 12:10 PM UTC.