California earthquakes

M1.8 earthquake 6 km SSW of Ridgemark, California

A magnitude 1.8 earthquake struck 6 km SSW of Ridgemark, California on Sat, Nov 20, 1982, 10:04 PM PST (06:04 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M1.9 8 km N of Hollister, 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
1.8 (md), micro
Local time
UTC
1982-11-21 06:04:29 UTC
Depth
8.1 km (5.0 mi), shallow
Epicenter
36.754° N, 121.383° 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
±0.15
Depth from
From location
Station coverage gap
30°
Stations used
45

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 144 in the 60 days after this one and 31 in the 30 days before it.

After

  1. 1.98 km N of Hollister, California · 16012 days ago · 7 km deep · 20 km away
  2. 1.94 km ESE of Aromas, California · 16011 days ago · 6 km deep · 23 km away
  3. 2.024 km SW of Three Rocks, California · 16011 days ago · 12 km deep · 87 km away
  4. 1.816 km ESE of Tres Pinos, California · 16010 days ago · 6 km deep · 20 km away
  5. 1.816 km ESE of Tres Pinos, California · 16010 days ago · 6 km deep · 20 km away
  6. 2.016 km SE of Tres Pinos, California · 16010 days ago · 5 km deep · 19 km away
  7. 2.212 km S of Tres Pinos, California · 16009 days ago · 4 km deep · 11 km away
  8. 1.824 km NE of Greenfield, California · 16009 days ago · 4 km deep · 45 km away
  9. 2.224 km ENE of Soledad, California · 16009 days ago · 3 km deep · 39 km away
  10. 1.917 km NE of East Foothills, California · 16007 days ago · 7 km deep · 88 km away
  11. 1.79 km S of South Dos Palos, California · 16004 days ago · 3 km deep · 67 km away
  12. 2.222 km SE of Livermore, California · 16003 days ago · 5 km deep · 90 km away
  13. 2.021 km SE of Livermore, California · 16003 days ago · 4 km deep · 91 km away
  14. 1.823 km NW of Coalinga, California · 16003 days ago · 14 km deep · 92 km away
  15. 2.424 km NE of Greenfield, California · 16003 days ago · 6 km deep · 44 km away
  16. 1.77 km WSW of San Ardo, California · 16003 days ago · 15 km deep · 91 km away
  17. 2.06 km SSW of Ridgemark, California · 16003 days ago · 8 km deep · 1 km away
  18. 1.55 km SSW of Ridgemark, California · 16003 days ago · 9 km deep · 2 km away
  19. 2.024 km ENE of Soledad, California · 16002 days ago · 4 km deep · 39 km away
  20. 1.723 km ENE of Greenfield, California · 16002 days ago · 4 km deep · 50 km away
  21. 1.716 km SW of Three Rocks, California · 16002 days ago · 21 km deep · 86 km away
  22. 1.818 km SW of Three Rocks, California · 16001 days ago · 18 km deep · 84 km away
  23. 2.09 km NE of Milpitas, California · 16001 days ago · 7 km deep · 90 km away
  24. 1.69 km ESE of East Foothills, California · 16000 days ago · 8 km deep · 73 km away
  25. 1.69 km ESE of East Foothills, California · 16000 days ago · 8 km deep · 73 km away
  26. 2.012 km S of Tres Pinos, California · 15999 days ago · 5 km deep · 11 km away
  27. 1.66 km SW of Ridgemark, California · 15999 days ago · 10 km deep · 4 km away
  28. 1.817 km SSE of Tres Pinos, California · 15998 days ago · 6 km deep · 17 km away
  29. 1.814 km SSE of Tres Pinos, California · 15997 days ago · 4 km deep · 15 km away
  30. 1.824 km ENE of Soledad, California · 15997 days ago · -1 km deep · 40 km away
  31. 1.79 km ENE of Gilroy, California · 15996 days ago · 8 km deep · 33 km away
  32. 1.730 km SE of Tres Pinos, California · 15995 days ago · 8 km deep · 33 km away
  33. 2.217 km SSE of Tres Pinos, California · 15995 days ago · 5 km deep · 16 km away
  34. 3.14 km ESE of Interlaken, California · 15995 days ago · 12 km deep · 34 km away
  35. 1.94 km ESE of Interlaken, California · 15995 days ago · 10 km deep · 34 km away
  36. 2.019 km NNW of Coalinga, California · 15995 days ago · 11 km deep · 97 km away
  37. 3.18 km SSW of Tres Pinos, California · 15994 days ago · 3 km deep · 4 km away
  38. 2.18 km SSW of Tres Pinos, California · 15994 days ago · 3 km deep · 4 km away
  39. 1.77 km SSW of Ridgemark, California · 15994 days ago · 2 km deep · 1 km away
  40. 1.913 km SSE of Tres Pinos, California · 15992 days ago · 5 km deep · 14 km away
  41. 2.49 km NNE of San Martin, California · 15992 days ago · 6 km deep · 47 km away
  42. 1.61 km S of Communications Hill, California · 15992 days ago · 4 km deep · 71 km away
  43. 1.723 km NE of Hollister, California · 15991 days ago · 0 km deep · 31 km away
  44. 2.521 km NE of Soledad, California · 15991 days ago · 7 km deep · 31 km away
  45. 1.521 km NE of Soledad, California · 15991 days ago · 6 km deep · 31 km away
  46. 2.77 km SSE of Gilroy, California · 15991 days ago · 6 km deep · 25 km away
  47. 1.824 km NE of Greenfield, California · 15991 days ago · 5 km deep · 41 km away
  48. 1.538 km W of Three Rocks, California · 15991 days ago · 0 km deep · 55 km away
  49. 1.824 km ENE of San Ardo, California · 15991 days ago · -1 km deep · 99 km away
  50. 1.526 km ENE of Greenfield, California · 15991 days ago · 0 km deep · 51 km away
  51. 2.218 km NE of East Foothills, California · 15991 days ago · 6 km deep · 89 km away
  52. 1.723 km NE of Hollister, California · 15990 days ago · 0 km deep · 31 km away
  53. 2.83 km W of San Juan Bautista, California · 15990 days ago · 6 km deep · 20 km away
  54. 1.63 km W of San Juan Bautista, California · 15990 days ago · 6 km deep · 20 km away
  55. 1.726 km ENE of Greenfield, California · 15990 days ago · 1 km deep · 50 km away
  56. 1.925 km NNE of King City, California · 15990 days ago · 1 km deep · 54 km away
  57. 2.125 km ENE of Greenfield, California · 15990 days ago · 5 km deep · 49 km away
  58. 1.919 km SSW of Volta, California · 15990 days ago · 6 km deep · 39 km away
  59. 1.815 km SSE of Tres Pinos, California · 15990 days ago · 4 km deep · 15 km away
  60. 1.521 km NE of Soledad, California · 15989 days ago · 8 km deep · 31 km away

The first 60 of 144.

Before

  1. 2.19 km E of San Martin, California · 16012 days ago · 8 km deep · 38 km away
  2. 1.63 km S of San Juan Bautista, California · 16012 days ago · 4 km deep · 15 km away
  3. 1.734 km W of Three Rocks, California · 16012 days ago · 0 km deep · 59 km away
  4. 1.621 km NE of Soledad, California · 16012 days ago · 7 km deep · 30 km away
  5. 1.629 km SW of Three Rocks, California · 16012 days ago · 10 km deep · 84 km away
  6. 1.622 km ENE of Soledad, California · 16013 days ago · 2 km deep · 34 km away
  7. 2.226 km SW of Three Rocks, California · 16013 days ago · 12 km deep · 88 km away
  8. 2.08 km E of Seven Trees, California · 16013 days ago · 6 km deep · 66 km away
  9. 1.924 km SW of Three Rocks, California · 16013 days ago · 5 km deep · 88 km away
  10. 2.211 km NNE of Morgan Hill, California · 16014 days ago · 5 km deep · 57 km away
  11. 1.524 km ENE of Greenfield, California · 16014 days ago · 0 km deep · 49 km away
  12. 2.323 km NE of Soledad, California · 16014 days ago · 10 km deep · 32 km away
  13. 1.924 km ENE of Soledad, California · 16015 days ago · 2 km deep · 40 km away
  14. 1.59 km SSW of Ridgemark, California · 16015 days ago · 6 km deep · 3 km away
  15. 2.215 km SW of Volta, California · 16016 days ago · 6 km deep · 40 km away
  16. 1.916 km ESE of Tres Pinos, California · 16017 days ago · 6 km deep · 20 km away
  17. 1.922 km SSW of Three Rocks, California · 16018 days ago · 9 km deep · 91 km away
  18. 2.016 km SE of Tres Pinos, California · 16018 days ago · 5 km deep · 20 km away
  19. 1.616 km ESE of Tres Pinos, California · 16018 days ago · 1 km deep · 20 km away
  20. 3.09 km NNE of East Foothills, California · 16018 days ago · 9 km deep · 86 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1082122. Read Tue, Sep 22, 2026, 9:28 PM UTC.