California earthquakes

M1.8 earthquake 6 km SSW of Ridgemark, California

A magnitude 1.8 earthquake struck 6 km SSW of Ridgemark, California on Wed, Nov 28, 1990, 10:44 AM PST (18:44 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M3.1 3 km W of San Juan Bautista, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-11-28 18:44:12 UTC
Depth
7.4 km (4.6 mi), shallow
Epicenter
36.761° N, 121.387° 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, 0.4 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
46°
Stations used
32

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 129 in the 60 days after this one and 94 in the 30 days before it.

After

  1. 2.09 km SSW of Tres Pinos, California · 13092 days ago · 3 km deep · 7 km away
  2. 1.716 km SE of Tres Pinos, California · 13092 days ago · 6 km deep · 20 km away
  3. 1.76 km SE of Seven Trees, California · 13092 days ago · 1 km deep · 65 km away
  4. 1.918 km SSE of Livermore, California · 13092 days ago · 6 km deep · 89 km away
  5. 1.62 km WSW of Hollister, California · 13091 days ago · 4 km deep · 10 km away
  6. 2.58 km SSW of Tres Pinos, California · 13091 days ago · 1 km deep · 7 km away
  7. 1.75 km ESE of Seven Trees, California · 13090 days ago · 0 km deep · 66 km away
  8. 1.814 km N of Morgan Hill, California · 13090 days ago · 5 km deep · 60 km away
  9. 1.55 km SW of Davenport, California · 13089 days ago · 5 km deep · 79 km away
  10. 1.83 km NNW of Seacliff, California · 13089 days ago · 4 km deep · 55 km away
  11. 2.014 km SSE of Tres Pinos, California · 13088 days ago · 5 km deep · 14 km away
  12. 2.225 km NNE of San Ardo, California · 13088 days ago · 6 km deep · 83 km away
  13. 1.94 km E of Interlaken, California · 13088 days ago · 9 km deep · 34 km away
  14. 2.021 km NE of Soledad, California · 13088 days ago · 7 km deep · 31 km away
  15. 1.66 km NE of Day Valley, California · 13087 days ago · 7 km deep · 51 km away
  16. 1.622 km ENE of Soledad, California · 13087 days ago · 6 km deep · 38 km away
  17. 2.916 km SSE of Tres Pinos, California · 13087 days ago · 3 km deep · 16 km away
  18. 1.521 km NE of Soledad, California · 13087 days ago · 7 km deep · 27 km away
  19. 1.66 km NE of Day Valley, California · 13086 days ago · 7 km deep · 51 km away
  20. 1.62 km SSW of Davenport, California · 13086 days ago · 12 km deep · 77 km away
  21. 1.92 km SSW of Davenport, California · 13086 days ago · 11 km deep · 77 km away
  22. 1.924 km SE of Tres Pinos, California · 13086 days ago · 7 km deep · 26 km away
  23. 1.95 km NNE of Tres Pinos, California · 13086 days ago · 5 km deep · 12 km away
  24. 1.64 km E of Interlaken, California · 13085 days ago · 11 km deep · 33 km away
  25. 1.512 km S of Tres Pinos, California · 13084 days ago · 2 km deep · 12 km away
  26. 2.04 km WNW of San Juan Bautista, California · 13084 days ago · 6 km deep · 21 km away
  27. 1.625 km WSW of Lockwood, California · 13083 days ago · 6 km deep · 96 km away
  28. 1.914 km SSE of Tres Pinos, California · 13083 days ago · 6 km deep · 14 km away
  29. 2.424 km NE of Greenfield, California · 13083 days ago · 2 km deep · 46 km away
  30. 1.923 km W of Volta, California · 13081 days ago · 4 km deep · 38 km away
  31. 1.927 km SE of Tres Pinos, California · 13081 days ago · 7 km deep · 30 km away
  32. 2.021 km NE of Soledad, California · 13081 days ago · 3 km deep · 30 km away
  33. 2.030 km W of Three Rocks, California · 13080 days ago · 8 km deep · 64 km away
  34. 1.9Central California · 13080 days ago · 4 km deep · 9 km away
  35. 1.610 km S of Tres Pinos, California · 13080 days ago · 4 km deep · 9 km away
  36. 2.010 km ESE of East Foothills, California · 13079 days ago · 7 km deep · 71 km away
  37. 2.424 km NE of Greenfield, California · 13078 days ago · 7 km deep · 43 km away
  38. 1.63 km NNW of Aromas, California · 13077 days ago · 8 km deep · 30 km away
  39. 1.935 km W of Three Rocks, California · 13077 days ago · 0 km deep · 59 km away
  40. 2.332 km WSW of Davenport, California · 13076 days ago · 1 km deep · 99 km away
  41. 1.921 km NNE of Soledad, California · 13075 days ago · 8 km deep · 26 km away
  42. 1.611 km ESE of East Foothills, California · 13075 days ago · 7 km deep · 70 km away
  43. 1.611 km ESE of East Foothills, California · 13075 days ago · 7 km deep · 70 km away
  44. 2.23 km WNW of San Juan Bautista, California · 13074 days ago · 7 km deep · 19 km away
  45. 1.82 km NNE of Day Valley, California · 13074 days ago · 12 km deep · 53 km away
  46. 1.824 km NE of Greenfield, California · 13073 days ago · 5 km deep · 43 km away
  47. 1.524 km NE of Greenfield, California · 13073 days ago · 6 km deep · 44 km away
  48. 1.52 km WSW of San Juan Bautista, California · 13072 days ago · 8 km deep · 18 km away
  49. 1.71 km WSW of San Juan Bautista, California · 13072 days ago · 4 km deep · 18 km away
  50. 2.811 km S of Tres Pinos, California · 13072 days ago · 4 km deep · 11 km away
  51. 1.915 km SSE of Tres Pinos, California · 13072 days ago · 5 km deep · 16 km away
  52. 1.512 km S of Tres Pinos, California · 13072 days ago · 2 km deep · 12 km away
  53. 2.111 km S of Tres Pinos, California · 13071 days ago · 4 km deep · 11 km away
  54. 2.813 km N of Morgan Hill, California · 13071 days ago · 4 km deep · 59 km away
  55. 1.622 km NE of San Lucas, California · 13070 days ago · 7 km deep · 73 km away
  56. 2.82 km SSW of San Juan Bautista, California · 13069 days ago · 4 km deep · 16 km away
  57. 3.02 km SW of San Juan Bautista, California · 13069 days ago · 5 km deep · 17 km away
  58. 2.12 km S of San Juan Bautista, California · 13069 days ago · 4 km deep · 16 km away
  59. 1.613 km N of Morgan Hill, California · 13068 days ago · 3 km deep · 59 km away
  60. 2.76 km E of East Foothills, California · 13068 days ago · 5 km deep · 77 km away

The first 60 of 129.

Before

  1. 1.524 km NE of Greenfield, California · 13093 days ago · 6 km deep · 44 km away
  2. 1.93 km NNW of Seacliff, California · 13094 days ago · 4 km deep · 55 km away
  3. 1.712 km N of Morgan Hill, California · 13094 days ago · 3 km deep · 58 km away
  4. 2.030 km WNW of Three Rocks, California · 13096 days ago · 6 km deep · 64 km away
  5. 1.822 km NW of Coalinga, California · 13096 days ago · 12 km deep · 93 km away
  6. 1.626 km WSW of Lockwood, California · 13096 days ago · 10 km deep · 99 km away
  7. 3.211 km NNE of Morgan Hill, California · 13096 days ago · 5 km deep · 56 km away
  8. 1.54 km WNW of San Juan Bautista, California · 13096 days ago · 6 km deep · 21 km away
  9. 1.67 km N of Day Valley, California · 13097 days ago · 5 km deep · 57 km away
  10. 2.224 km ENE of Soledad, California · 13097 days ago · 3 km deep · 40 km away
  11. 1.625 km ENE of San Ardo, California · 13098 days ago · 9 km deep · 96 km away
  12. 1.713 km S of Tres Pinos, California · 13098 days ago · 4 km deep · 13 km away
  13. 1.724 km ENE of Soledad, California · 13098 days ago · 3 km deep · 40 km away
  14. 1.910 km ESE of East Foothills, California · 13098 days ago · 7 km deep · 71 km away
  15. 1.921 km NE of Soledad, California · 13099 days ago · 5 km deep · 33 km away
  16. 2.021 km NE of Soledad, California · 13099 days ago · 5 km deep · 33 km away
  17. 2.921 km NE of Soledad, California · 13099 days ago · 5 km deep · 33 km away
  18. 1.729 km SE of Big Sur, California · 13099 days ago · 11 km deep · 76 km away
  19. 1.715 km W of Davenport, California · 13099 days ago · 11 km deep · 91 km away
  20. 2.523 km NE of King City, California · 13099 days ago · 6 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc201360. Read Sun, Oct 4, 2026, 2:09 AM UTC.