California earthquakes

M2.4 earthquake 9 km SW of Ridgemark, California

A magnitude 2.4 earthquake struck 9 km SW of Ridgemark, California on Tue, Apr 20, 1982, 5:04 AM PST (13:04 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.1 29 km ENE of Soledad, 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.

Open the live map with earthquakes

The earthquake

Magnitude
2.4 (md), micro
Local time
UTC
1982-04-20 13:04:58 UTC
Depth
5.9 km (3.6 mi), shallow
Epicenter
36.761° N, 121.452° 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
41°
Stations used
54

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 148 in the 60 days after this one and 71 in the 30 days before it.

After

  1. 1.810 km S of Tres Pinos, California · 16232 days ago · 4 km deep · 13 km away
  2. 1.910 km SE of Livermore, California · 16231 days ago · 10 km deep · 98 km away
  3. 1.56 km NNE of East Foothills, California · 16230 days ago · 5 km deep · 81 km away
  4. 1.816 km E of East Foothills, California · 16230 days ago · 8 km deep · 71 km away
  5. 1.524 km NE of King City, California · 16230 days ago · 1 km deep · 60 km away
  6. 2.924 km NE of King City, California · 16229 days ago · 4 km deep · 66 km away
  7. 2.917 km E of East Foothills, California · 16229 days ago · 7 km deep · 71 km away
  8. 1.79 km NNW of Hollister, California · 16229 days ago · 5 km deep · 20 km away
  9. 3.12 km S of Hollister, California · 16228 days ago · 9 km deep · 9 km away
  10. 3.16 km NE of East Foothills, California · 16227 days ago · 8 km deep · 77 km away
  11. 1.96 km ENE of East Foothills, California · 16227 days ago · 9 km deep · 77 km away
  12. 1.723 km NE of San Ardo, California · 16227 days ago · 7 km deep · 89 km away
  13. 2.315 km SSE of Tres Pinos, California · 16226 days ago · 12 km deep · 23 km away
  14. 2.322 km NNE of Soledad, California · 16226 days ago · 9 km deep · 27 km away
  15. 1.93 km SW of Los Altos Hills, California · 16225 days ago · 8 km deep · 91 km away
  16. 1.63 km E of Interlaken, California · 16225 days ago · 6 km deep · 30 km away
  17. 2.96 km NNE of Interlaken, California · 16224 days ago · 11 km deep · 36 km away
  18. 1.724 km NE of Greenfield, California · 16223 days ago · 5 km deep · 47 km away
  19. 1.69 km NNW of Hollister, California · 16223 days ago · 6 km deep · 20 km away
  20. 2.09 km NNW of Hollister, California · 16222 days ago · 6 km deep · 19 km away
  21. 2.11 km ESE of Aromas, California · 16222 days ago · 7 km deep · 21 km away
  22. 1.921 km NE of Soledad, California · 16220 days ago · 5 km deep · 37 km away
  23. 1.924 km NE of Greenfield, California · 16220 days ago · 5 km deep · 48 km away
  24. 3.18 km ENE of Gilroy, California · 16220 days ago · 7 km deep · 31 km away
  25. 3.19 km NNW of Hollister, California · 16219 days ago · 7 km deep · 20 km away
  26. 2.3Central California · 16219 days ago · 6 km deep · 19 km away
  27. 1.924 km NNE of San Ardo, California · 16219 days ago · 7 km deep · 88 km away
  28. 1.58 km ENE of Morgan Hill, California · 16219 days ago · 4 km deep · 47 km away
  29. 1.734 km SW of South Dos Palos, California · 16219 days ago · 6 km deep · 52 km away
  30. 2.99 km NNW of Hollister, California · 16219 days ago · 8 km deep · 20 km away
  31. 3.34 km W of San Juan Bautista, California · 16218 days ago · 5 km deep · 15 km away
  32. 2.121 km NE of Soledad, California · 16218 days ago · 7 km deep · 35 km away
  33. 1.926 km ENE of Soledad, California · 16218 days ago · 8 km deep · 41 km away
  34. 2.722 km NNE of Soledad, California · 16217 days ago · 5 km deep · 30 km away
  35. 1.734 km SW of South Dos Palos, California · 16217 days ago · 5 km deep · 51 km away
  36. 3.122 km NE of Soledad, California · 16216 days ago · 3 km deep · 34 km away
  37. 1.78 km NNE of Milpitas, California · 16216 days ago · 3 km deep · 90 km away
  38. 1.922 km NNE of Soledad, California · 16214 days ago · 7 km deep · 29 km away
  39. 1.922 km NNE of Soledad, California · 16214 days ago · 10 km deep · 29 km away
  40. 2.122 km NNE of San Lucas, California · 16213 days ago · 4 km deep · 71 km away
  41. 1.510 km NNW of Hollister, California · 16213 days ago · 5 km deep · 20 km away
  42. 1.723 km NE of San Ardo, California · 16212 days ago · 4 km deep · 89 km away
  43. 3.017 km SSE of Tres Pinos, California · 16212 days ago · 6 km deep · 23 km away
  44. 3.117 km SSE of Tres Pinos, California · 16212 days ago · 6 km deep · 23 km away
  45. 1.517 km SSE of Tres Pinos, California · 16212 days ago · 6 km deep · 22 km away
  46. 1.73 km ESE of Aromas, California · 16211 days ago · 5 km deep · 19 km away
  47. 3.617 km SSE of Tres Pinos, California · 16211 days ago · 6 km deep · 22 km away
  48. 2.517 km SSE of Tres Pinos, California · 16211 days ago · 6 km deep · 22 km away
  49. 1.917 km SSE of Tres Pinos, California · 16211 days ago · 5 km deep · 22 km away
  50. 1.717 km SSE of Tres Pinos, California · 16211 days ago · 7 km deep · 22 km away
  51. 1.517 km SSE of Tres Pinos, California · 16210 days ago · 5 km deep · 22 km away
  52. 1.618 km SSE of Tres Pinos, California · 16210 days ago · 6 km deep · 23 km away
  53. 1.917 km WSW of Volta, California · 16210 days ago · 7 km deep · 43 km away
  54. 1.69 km SSW of Tres Pinos, California · 16210 days ago · 7 km deep · 11 km away
  55. 2.918 km SSE of Tres Pinos, California · 16210 days ago · 7 km deep · 23 km away
  56. 2.518 km SSE of Tres Pinos, California · 16209 days ago · 5 km deep · 23 km away
  57. 1.67 km WSW of Gilroy, California · 16208 days ago · 5 km deep · 31 km away
  58. 2.222 km SSW of South Dos Palos, California · 16208 days ago · 4 km deep · 60 km away
  59. 1.64 km SE of Lexington Hills, California · 16208 days ago · 12 km deep · 60 km away
  60. 1.713 km SSW of Tracy, California · 16208 days ago · 7 km deep · 96 km away

The first 60 of 148.

Before

  1. 1.63 km SE of San Ardo, California · 16233 days ago · 9 km deep · 99 km away
  2. 1.64 km SE of Prunedale, California · 16234 days ago · 14 km deep · 17 km away
  3. 1.93 km SSE of San Juan Bautista, California · 16236 days ago · 3 km deep · 8 km away
  4. 1.526 km SE of Tres Pinos, California · 16238 days ago · 9 km deep · 34 km away
  5. 1.921 km NE of Soledad, California · 16238 days ago · 7 km deep · 38 km away
  6. 2.122 km WNW of Diablo Grande, California · 16238 days ago · 6 km deep · 77 km away
  7. 1.75 km SSW of Gilroy, California · 16238 days ago · 5 km deep · 25 km away
  8. 3.03 km WSW of San Juan Bautista, California · 16239 days ago · 7 km deep · 14 km away
  9. 2.88 km ENE of Patterson, California · 16239 days ago · 12 km deep · 89 km away
  10. 2.227 km WSW of Mendota, California · 16240 days ago · 9 km deep · 70 km away
  11. 1.87 km S of Merced, California · 16240 days ago · 19 km deep · 100 km away
  12. 2.69 km ENE of Gilroy, California · 16240 days ago · 9 km deep · 31 km away
  13. 1.912 km ESE of Livermore, California · 16241 days ago · 7 km deep · 98 km away
  14. 1.76 km ENE of East Foothills, California · 16241 days ago · 9 km deep · 77 km away
  15. 2.132 km SE of Tres Pinos, California · 16241 days ago · 23 km deep · 41 km away
  16. 2.96 km E of East Foothills, California · 16241 days ago · 7 km deep · 75 km away
  17. 1.824 km NE of Greenfield, California · 16241 days ago · 7 km deep · 49 km away
  18. 3.416 km SSE of Tres Pinos, California · 16241 days ago · 10 km deep · 21 km away
  19. 2.04 km SSE of San Juan Bautista, California · 16242 days ago · 7 km deep · 8 km away
  20. 2.819 km ESE of Tres Pinos, California · 16242 days ago · 7 km deep · 30 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1073833. Read Mon, Sep 28, 2026, 2:16 PM UTC.