California earthquakes

M2.4 earthquake 10 km WSW of Ridgemark, California

A magnitude 2.4 earthquake struck 10 km WSW of Ridgemark, California on Fri, Apr 6, 1979, 4:23 AM PST (12:23 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.8 15 km E of Seven Trees, 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
2.4 (md), micro
Local time
UTC
1979-04-06 12:23:20 UTC
Depth
6.4 km (4.0 mi), shallow
Epicenter
36.762° N, 121.459° 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
±0.13
Depth from
From location
Station coverage gap
40°
Stations used
48

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 160 in the 60 days after this one and 62 in the 30 days before it.

After

  1. 1.513 km N of Morgan Hill, California · 17344 days ago · 5 km deep · 57 km away
  2. 1.98 km NE of Milpitas, California · 17344 days ago · 7 km deep · 86 km away
  3. 2.210 km E of Big Sur, California · 17343 days ago · 11 km deep · 58 km away
  4. 2.410 km S of Tres Pinos, California · 17343 days ago · 4 km deep · 13 km away
  5. 2.810 km E of Big Sur, California · 17343 days ago · 11 km deep · 58 km away
  6. 2.532 km W of Three Rocks, California · 17341 days ago · 10 km deep · 70 km away
  7. 2.131 km ENE of Soledad, California · 17340 days ago · 9 km deep · 45 km away
  8. 2.722 km WNW of Three Rocks, California · 17340 days ago · 8 km deep · 77 km away
  9. 1.722 km WNW of Three Rocks, California · 17340 days ago · 5 km deep · 78 km away
  10. 2.021 km NE of Soledad, California · 17339 days ago · 6 km deep · 37 km away
  11. 1.625 km NE of Greenfield, California · 17338 days ago · 1 km deep · 53 km away
  12. 1.723 km ENE of Soledad, California · 17338 days ago · 2 km deep · 42 km away
  13. 2.08 km SW of Tres Pinos, California · 17337 days ago · 2 km deep · 8 km away
  14. 2.77 km SSE of Livermore, California · 17337 days ago · 5 km deep · 99 km away
  15. 2.27 km SSE of Livermore, California · 17337 days ago · 6 km deep · 99 km away
  16. 1.924 km NE of King City, California · 17337 days ago · 1 km deep · 61 km away
  17. 1.723 km NE of Soledad, California · 17336 days ago · 8 km deep · 37 km away
  18. 2.222 km NE of Soledad, California · 17336 days ago · 2 km deep · 39 km away
  19. 2.13 km NE of Interlaken, California · 17335 days ago · 11 km deep · 32 km away
  20. 2.19 km SW of San Martin, California · 17335 days ago · 2 km deep · 37 km away
  21. 2.69 km ESE of East Foothills, California · 17333 days ago · 6 km deep · 70 km away
  22. 1.522 km NE of San Lucas, California · 17333 days ago · 5 km deep · 74 km away
  23. 1.622 km ENE of San Lucas, California · 17332 days ago · 9 km deep · 82 km away
  24. 1.932 km WNW of Three Rocks, California · 17332 days ago · 12 km deep · 68 km away
  25. 2.06 km NNE of East Foothills, California · 17332 days ago · 6 km deep · 80 km away
  26. 2.822 km NE of Soledad, California · 17331 days ago · 2 km deep · 39 km away
  27. 1.95 km ESE of Aromas, California · 17331 days ago · 5 km deep · 16 km away
  28. 1.711 km S of Tres Pinos, California · 17331 days ago · 5 km deep · 15 km away
  29. 1.922 km NE of Soledad, California · 17330 days ago · 2 km deep · 39 km away
  30. 3.542km SW of Mendota, CA · 17330 days ago · 6 km deep · 68 km away
  31. 2.826 km WNW of Three Rocks, California · 17330 days ago · 3 km deep · 74 km away
  32. 2.1Central California · 17330 days ago · 4 km deep · 9 km away
  33. 2.314 km E of Seven Trees, California · 17330 days ago · 6 km deep · 63 km away
  34. 2.022 km NE of Soledad, California · 17329 days ago · 4 km deep · 38 km away
  35. 1.85 km SSW of Tres Pinos, California · 17329 days ago · 4 km deep · 9 km away
  36. 2.224 km NE of Greenfield, California · 17328 days ago · 4 km deep · 48 km away
  37. 3.1Central California · 17328 days ago · 8 km deep · 8 km away
  38. 1.54 km S of Ridgemark, California · 17328 days ago · 3 km deep · 8 km away
  39. 2.04 km WNW of San Juan Bautista, California · 17328 days ago · 6 km deep · 16 km away
  40. 2.714 km N of Morgan Hill, California · 17327 days ago · 6 km deep · 58 km away
  41. 1.83 km S of Tres Pinos, California · 17326 days ago · 5 km deep · 12 km away
  42. 2.521 km NE of Soledad, California · 17326 days ago · 6 km deep · 37 km away
  43. 2.321 km NE of Soledad, California · 17326 days ago · 5 km deep · 38 km away
  44. 1.814 km N of Morgan Hill, California · 17323 days ago · 6 km deep · 57 km away
  45. 1.84 km SSW of Gilroy, California · 17323 days ago · 6 km deep · 25 km away
  46. 1.622 km NNE of Soledad, California · 17323 days ago · 5 km deep · 29 km away
  47. 2.11 km N of Aromas, California · 17323 days ago · 8 km deep · 22 km away
  48. 2.121 km NE of Soledad, California · 17322 days ago · 7 km deep · 35 km away
  49. 2.55 km NNW of San Juan Bautista, California · 17321 days ago · 7 km deep · 17 km away
  50. 1.712 km SE of Carmel Valley Village, California · 17320 days ago · 8 km deep · 44 km away
  51. 2.211 km SSE of Livermore, California · 17320 days ago · 5 km deep · 95 km away
  52. 2.411 km SSE of Livermore, California · 17320 days ago · 6 km deep · 95 km away
  53. 2.511 km SSE of Livermore, California · 17320 days ago · 6 km deep · 95 km away
  54. 1.66 km ESE of East Foothills, California · 17319 days ago · 2 km deep · 72 km away
  55. 1.531 km SW of South Dos Palos, California · 17318 days ago · 3 km deep · 50 km away
  56. 2.524 km ENE of Soledad, California · 17317 days ago · 2 km deep · 46 km away
  57. 1.722 km NNE of Soledad, California · 17317 days ago · 1 km deep · 29 km away
  58. 1.827 km NE of King City, California · 17316 days ago · 5 km deep · 60 km away
  59. 1.97 km NNE of Interlaken, California · 17316 days ago · 6 km deep · 36 km away
  60. 2.38 km S of Sunol, California · 17315 days ago · 6 km deep · 93 km away

The first 60 of 160.

Before

  1. 1.623 km ENE of Soledad, California · 17344 days ago · 1 km deep · 42 km away
  2. 1.621 km SSW of Three Rocks, California · 17344 days ago · 4 km deep · 100 km away
  3. 1.523 km ENE of Soledad, California · 17344 days ago · 3 km deep · 41 km away
  4. 1.87 km NNE of Hollister, California · 17344 days ago · 7 km deep · 18 km away
  5. 1.65 km S of Gilroy, California · 17345 days ago · 3 km deep · 24 km away
  6. 1.79 km WSW of Ridgemark, California · 17346 days ago · 7 km deep · 1 km away
  7. 3.010 km WSW of Ridgemark, California · 17346 days ago · 8 km deep · 1 km away
  8. 2.34 km E of Sunol, California · 17348 days ago · 7 km deep · 98 km away
  9. 2.825km SSE of King City, CA · 17350 days ago · 6 km deep · 93 km away
  10. 2.215 km N of Morgan Hill, California · 17350 days ago · 2 km deep · 59 km away
  11. 2.624 km ENE of Soledad, California · 17351 days ago · 4 km deep · 45 km away
  12. 3.524 km ENE of Soledad, California · 17351 days ago · 3 km deep · 46 km away
  13. 2.423 km ENE of Soledad, California · 17351 days ago · 3 km deep · 45 km away
  14. 1.726 km ENE of Greenfield, California · 17352 days ago · 9 km deep · 57 km away
  15. 2.024 km ENE of Greenfield, California · 17352 days ago · 3 km deep · 53 km away
  16. 2.12 km ESE of Cupertino, California · 17353 days ago · 13 km deep · 78 km away
  17. 1.924 km NE of San Ardo, California · 17354 days ago · 8 km deep · 89 km away
  18. 2.123 km NE of San Ardo, California · 17354 days ago · 10 km deep · 90 km away
  19. 1.923 km NE of San Ardo, California · 17354 days ago · 12 km deep · 90 km away
  20. 1.931 km NE of King City, California · 17354 days ago · 14 km deep · 61 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1045293. Read Wed, Sep 30, 2026, 9:59 AM UTC.