California earthquakes

M2.1 earthquake 10 km WSW of Ridgemark, California

A magnitude 2.1 earthquake struck 10 km WSW of Ridgemark, California on Tue, Feb 6, 1979, 1:02 AM PST (09:02 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M2.2 23 km NE of San Ardo, 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
2.1 (md), micro
Local time
UTC
1979-02-06 09:02:30 UTC
Depth
7.3 km (4.6 mi), shallow
Epicenter
36.767° N, 121.464° 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, 0.4 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
50°
Stations used
35

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 142 in the 60 days after this one and 40 in the 30 days before it.

After

  1. 1.822 km NNE of Soledad, California · 17396 days ago · 6 km deep · 29 km away
  2. 1.85 km SW of Gilroy, California · 17395 days ago · 6 km deep · 26 km away
  3. 1.625 km ENE of Soledad, California · 17394 days ago · 8 km deep · 42 km away
  4. 1.87 km NNE of East Foothills, California · 17394 days ago · 6 km deep · 82 km away
  5. 2.223 km NE of San Ardo, California · 17394 days ago · 6 km deep · 90 km away
  6. 2.124 km ENE of Greenfield, California · 17392 days ago · 5 km deep · 58 km away
  7. 1.65 km SSW of Tres Pinos, California · 17392 days ago · 8 km deep · 11 km away
  8. 1.76 km NE of East Foothills, California · 17392 days ago · 8 km deep · 78 km away
  9. 1.824 km ENE of King City, California · 17391 days ago · 4 km deep · 70 km away
  10. 2.54 km SSW of Gilroy, California · 17391 days ago · 7 km deep · 25 km away
  11. 2.324 km ENE of Greenfield, California · 17390 days ago · 6 km deep · 58 km away
  12. 3.612 km S of Tres Pinos, California · 17389 days ago · 4 km deep · 17 km away
  13. 2.512 km S of Tres Pinos, California · 17389 days ago · 4 km deep · 18 km away
  14. 3.112 km S of Tres Pinos, California · 17389 days ago · 4 km deep · 17 km away
  15. 4.014 km S of Tres Pinos, California · 17389 days ago · 6 km deep · 19 km away
  16. 1.811 km S of Tres Pinos, California · 17389 days ago · 4 km deep · 16 km away
  17. 2.512 km S of Tres Pinos, California · 17389 days ago · 4 km deep · 17 km away
  18. 1.823 km NE of King City, California · 17389 days ago · 5 km deep · 62 km away
  19. 1.612 km S of Tres Pinos, California · 17389 days ago · 4 km deep · 17 km away
  20. 2.55 km S of Gilroy, California · 17388 days ago · 6 km deep · 24 km away
  21. 3.523 km NE of Soledad, California · 17388 days ago · 9 km deep · 37 km away
  22. 1.624 km NE of Soledad, California · 17388 days ago · 9 km deep · 38 km away
  23. 1.823 km NE of Soledad, California · 17388 days ago · 9 km deep · 37 km away
  24. 1.811 km ESE of East Foothills, California · 17387 days ago · 8 km deep · 67 km away
  25. 1.521 km NE of Soledad, California · 17387 days ago · 8 km deep · 35 km away
  26. 1.75 km S of Gilroy, California · 17387 days ago · 6 km deep · 23 km away
  27. 2.07 km E of Gilroy, California · 17386 days ago · 5 km deep · 27 km away
  28. 2.07 km E of Gilroy, California · 17386 days ago · 4 km deep · 27 km away
  29. 1.924 km NE of Soledad, California · 17386 days ago · 9 km deep · 38 km away
  30. 2.511 km S of Tres Pinos, California · 17386 days ago · 4 km deep · 16 km away
  31. 3.017 km SSE of Tres Pinos, California · 17386 days ago · 5 km deep · 23 km away
  32. 1.616 km SSE of Tres Pinos, California · 17386 days ago · 5 km deep · 23 km away
  33. 2.116 km SSE of Tres Pinos, California · 17386 days ago · 5 km deep · 22 km away
  34. 2.01 km S of Milpitas, California · 17385 days ago · 2 km deep · 82 km away
  35. 1.66 km SE of Tres Pinos, California · 17385 days ago · 10 km deep · 18 km away
  36. 1.78 km ENE of Morgan Hill, California · 17385 days ago · 3 km deep · 46 km away
  37. 1.923 km NE of Soledad, California · 17385 days ago · 9 km deep · 37 km away
  38. 2.015 km SSW of Santa Cruz, California · 17385 days ago · 5 km deep · 58 km away
  39. 1.933 km SSE of Big Sur, California · 17385 days ago · 3 km deep · 84 km away
  40. 1.823 km NE of Soledad, California · 17384 days ago · 9 km deep · 37 km away
  41. 2.95 km S of Gilroy, California · 17384 days ago · 7 km deep · 23 km away
  42. 2.58 km NNE of Morgan Hill, California · 17384 days ago · 5 km deep · 51 km away
  43. 2.75 km SW of Gilroy, California · 17384 days ago · 4 km deep · 26 km away
  44. 2.14 km SW of Ridgemark, California · 17383 days ago · 9 km deep · 6 km away
  45. 2.56 km ESE of Fremont, California · 17383 days ago · 7 km deep · 94 km away
  46. 1.523 km NE of Soledad, California · 17382 days ago · 9 km deep · 37 km away
  47. 1.89 km NNW of Hollister, California · 17382 days ago · 7 km deep · 18 km away
  48. 1.58 km NNE of Milpitas, California · 17382 days ago · 3 km deep · 89 km away
  49. 1.824 km NE of Soledad, California · 17382 days ago · 7 km deep · 37 km away
  50. 1.812 km S of Tres Pinos, California · 17381 days ago · 2 km deep · 17 km away
  51. 1.824 km NE of Soledad, California · 17380 days ago · 9 km deep · 38 km away
  52. 2.024 km NE of Soledad, California · 17380 days ago · 9 km deep · 38 km away
  53. 1.924 km NE of Soledad, California · 17380 days ago · 9 km deep · 37 km away
  54. 2.4Central California · 17380 days ago · 4 km deep · 17 km away
  55. 1.624 km ENE of Greenfield, California · 17379 days ago · 5 km deep · 54 km away
  56. 1.820 km W of Volta, California · 17379 days ago · 3 km deep · 46 km away
  57. 2.121 km NE of Soledad, California · 17377 days ago · 8 km deep · 39 km away
  58. 1.77 km ESE of Sunol, California · 17377 days ago · 10 km deep · 94 km away
  59. 1.93 km S of Hollister, California · 17377 days ago · 7 km deep · 8 km away
  60. 1.521 km NE of Soledad, California · 17376 days ago · 7 km deep · 37 km away

The first 60 of 142.

Before

  1. 2.722 km NNE of Soledad, California · 17396 days ago · 7 km deep · 29 km away
  2. 1.820 km NE of San Lucas, California · 17396 days ago · 5 km deep · 81 km away
  3. 3.414 km E of Seven Trees, California · 17397 days ago · 8 km deep · 63 km away
  4. 2.06 km WSW of Gilroy, California · 17398 days ago · 6 km deep · 28 km away
  5. 2.62 km SW of Ridgemark, California · 17398 days ago · 3 km deep · 8 km away
  6. 2.08 km WSW of Westley, California · 17398 days ago · 0 km deep · 85 km away
  7. 1.624 km NE of Greenfield, California · 17399 days ago · 5 km deep · 51 km away
  8. 1.69 km SSW of Tres Pinos, California · 17402 days ago · 2 km deep · 13 km away
  9. 1.812 km NE of Morgan Hill, California · 17403 days ago · 5 km deep · 50 km away
  10. 2.523 km ENE of San Lucas, California · 17404 days ago · 6 km deep · 83 km away
  11. 2.45 km ESE of East Foothills, California · 17405 days ago · 1 km deep · 72 km away
  12. 3.13 km W of San Juan Bautista, California · 17406 days ago · 6 km deep · 13 km away
  13. 3.03 km W of San Juan Bautista, California · 17406 days ago · 7 km deep · 13 km away
  14. 2.08 km NNE of Interlaken, California · 17408 days ago · 10 km deep · 36 km away
  15. 2.1Central California · 17408 days ago · 7 km deep · 36 km away
  16. 1.64 km S of Loyola, California · 17409 days ago · 7 km deep · 83 km away
  17. 2.620 km NE of Morgan Hill, California · 17409 days ago · 2 km deep · 52 km away
  18. 1.66 km NE of Ridgemark, California · 17409 days ago · 2 km deep · 17 km away
  19. 2.423 km ENE of San Lucas, California · 17409 days ago · 5 km deep · 85 km away
  20. 1.55 km SE of Alum Rock, California · 17410 days ago · 2 km deep · 69 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1044547. Read Tue, Sep 22, 2026, 10:25 PM UTC.