California earthquakes

M2.0 earthquake 9 km SSW of Ridgemark, California

A magnitude 2.0 earthquake struck 9 km SSW of Ridgemark, California on Sat, Apr 21, 1990, 10:53 PM PDT (05:53 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.6 7 km E of East Foothills, 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
2.0 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-04-22 05:53:55 UTC
Depth
6.4 km (4.0 mi), shallow
Epicenter
36.735° N, 121.405° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
32°
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: 173 in the 60 days after this one and 190 in the 30 days before it.

After

  1. 2.13 km NNW of Aromas, California · 13313 days ago · 8 km deep · 31 km away
  2. 3.322 km NNE of Soledad, California · 13313 days ago · 9 km deep · 23 km away
  3. 1.722 km NNE of Soledad, California · 13313 days ago · 8 km deep · 23 km away
  4. 1.93 km ESE of Aromas, California · 13313 days ago · 7 km deep · 24 km away
  5. 1.822 km SSE of Tres Pinos, California · 13313 days ago · 5 km deep · 23 km away
  6. 2.51 km NE of Aromas, California · 13313 days ago · 5 km deep · 27 km away
  7. 2.125 km NNE of King City, California · 13312 days ago · 1 km deep · 53 km away
  8. 2.022 km NNE of Soledad, California · 13312 days ago · 8 km deep · 23 km away
  9. 2.14 km ESE of Interlaken, California · 13312 days ago · 11 km deep · 34 km away
  10. 2.51 km ENE of Aromas, California · 13312 days ago · 7 km deep · 27 km away
  11. 2.84 km ENE of Interlaken, California · 13312 days ago · 7 km deep · 35 km away
  12. 1.62 km N of Aromas, California · 13311 days ago · 6 km deep · 28 km away
  13. 1.729 km E of Tres Pinos, California · 13311 days ago · 5 km deep · 38 km away
  14. 1.521 km NNE of Soledad, California · 13311 days ago · 8 km deep · 23 km away
  15. 2.314 km E of Seven Trees, California · 13311 days ago · 2 km deep · 67 km away
  16. 1.714 km E of Seven Trees, California · 13311 days ago · 3 km deep · 67 km away
  17. 2.617 km NW of Diablo Grande, California · 13311 days ago · 3 km deep · 86 km away
  18. 2.74 km E of Interlaken, California · 13311 days ago · 6 km deep · 35 km away
  19. 2.22 km ESE of Aromas, California · 13311 days ago · 7 km deep · 25 km away
  20. 2.817 km NW of Diablo Grande, California · 13311 days ago · 3 km deep · 86 km away
  21. 1.94 km E of Interlaken, California · 13311 days ago · 9 km deep · 35 km away
  22. 2.337 km SSW of South Dos Palos, California · 13310 days ago · 5 km deep · 51 km away
  23. 2.96 km ENE of Interlaken, California · 13310 days ago · 3 km deep · 35 km away
  24. 1.721 km NE of Soledad, California · 13310 days ago · 8 km deep · 32 km away
  25. 1.64 km NNW of Aromas, California · 13310 days ago · 9 km deep · 31 km away
  26. 1.63 km N of Aromas, California · 13309 days ago · 7 km deep · 30 km away
  27. 2.02 km SSW of Los Altos Hills, California · 13309 days ago · 5 km deep · 96 km away
  28. 1.62 km NNW of Aromas, California · 13309 days ago · 9 km deep · 30 km away
  29. 2.1Central California · 13309 days ago · 8 km deep · 29 km away
  30. 2.34 km N of Corralitos, California · 13308 days ago · 12 km deep · 48 km away
  31. 1.91 km NNE of Aromas, California · 13308 days ago · 7 km deep · 28 km away
  32. 1.50 km WNW of San Juan Bautista, California · 13308 days ago · 9 km deep · 18 km away
  33. 2.814 km ESE of Tres Pinos, California · 13308 days ago · 11 km deep · 20 km away
  34. 2.45 km N of Interlaken, California · 13307 days ago · 9 km deep · 42 km away
  35. 1.56 km N of Interlaken, California · 13307 days ago · 8 km deep · 42 km away
  36. 1.65 km ESE of Interlaken, California · 13307 days ago · 13 km deep · 33 km away
  37. 1.65 km ENE of Interlaken, California · 13306 days ago · 7 km deep · 36 km away
  38. 2.84 km NW of Day Valley, California · 13305 days ago · 13 km deep · 57 km away
  39. 2.44 km NNW of Day Valley, California · 13305 days ago · 13 km deep · 57 km away
  40. 2.35 km SW of Tres Pinos, California · 13305 days ago · 10 km deep · 5 km away
  41. 2.421 km SE of Tres Pinos, California · 13305 days ago · 7 km deep · 23 km away
  42. 1.85 km SW of Ridgemark, California · 13304 days ago · 4 km deep · 5 km away
  43. 2.110 km NE of San Ardo, California · 13304 days ago · 4 km deep · 87 km away
  44. 1.61 km NE of Corralitos, California · 13304 days ago · 15 km deep · 46 km away
  45. 1.93 km WSW of Cupertino, California · 13304 days ago · 5 km deep · 87 km away
  46. 1.79 km NE of Morgan Hill, California · 13303 days ago · 8 km deep · 55 km away
  47. 1.64 km SE of Aromas, California · 13303 days ago · 6 km deep · 22 km away
  48. 1.523 km ENE of San Ardo, California · 13301 days ago · 7 km deep · 95 km away
  49. 1.625 km NE of Soledad, California · 13301 days ago · 6 km deep · 28 km away
  50. 2.66 km S of Sunol, California · 13300 days ago · 7 km deep · 99 km away
  51. 2.014 km ENE of East Foothills, California · 13300 days ago · 5 km deep · 79 km away
  52. 2.02 km N of Lexington Hills, California · 13299 days ago · 5 km deep · 71 km away
  53. 1.624 km NE of Greenfield, California · 13299 days ago · 5 km deep · 44 km away
  54. 2.45 km ESE of Interlaken, California · 13298 days ago · 8 km deep · 33 km away
  55. 1.98 km N of Day Valley, California · 13298 days ago · 4 km deep · 57 km away
  56. 2.21 km ENE of Aromas, California · 13297 days ago · 7 km deep · 27 km away
  57. 1.91 km E of Aromas, California · 13297 days ago · 7 km deep · 26 km away
  58. 1.64 km E of Interlaken, California · 13297 days ago · 10 km deep · 34 km away
  59. 2.121 km NE of Soledad, California · 13297 days ago · 3 km deep · 27 km away
  60. 2.88 km NNE of Day Valley, California · 13297 days ago · 4 km deep · 56 km away

The first 60 of 173.

Before

  1. 3.81 km NNE of Aromas, California · 13314 days ago · 6 km deep · 28 km away
  2. 1.91 km E of Aromas, California · 13314 days ago · 9 km deep · 26 km away
  3. 2.14 km NNW of Aromas, California · 13314 days ago · 11 km deep · 31 km away
  4. 1.96 km NE of Lockwood, California · 13314 days ago · 10 km deep · 91 km away
  5. 2.34 km NNW of Aromas, California · 13314 days ago · 11 km deep · 31 km away
  6. 1.73 km NNW of Aromas, California · 13314 days ago · 8 km deep · 30 km away
  7. 1.92 km NNE of Aromas, California · 13314 days ago · 6 km deep · 28 km away
  8. 2.24 km ESE of Interlaken, California · 13314 days ago · 10 km deep · 33 km away
  9. 1.72 km NNW of Aromas, California · 13314 days ago · 9 km deep · 29 km away
  10. 2.08 km N of Morgan Hill, California · 13314 days ago · 7 km deep · 56 km away
  11. 2.13 km NNW of Aromas, California · 13314 days ago · 8 km deep · 31 km away
  12. 2.221 km NNE of Soledad, California · 13314 days ago · 8 km deep · 24 km away
  13. 1.64 km NNW of Aromas, California · 13314 days ago · 8 km deep · 31 km away
  14. 2.62 km NNW of Aromas, California · 13315 days ago · 11 km deep · 30 km away
  15. 1.84 km NNW of Aromas, California · 13315 days ago · 6 km deep · 31 km away
  16. 1.72 km NNW of Aromas, California · 13315 days ago · 9 km deep · 29 km away
  17. 1.92 km NNW of Aromas, California · 13315 days ago · 9 km deep · 29 km away
  18. 1.62 km NNW of Aromas, California · 13315 days ago · 9 km deep · 29 km away
  19. 2.22 km NNE of Aromas, California · 13315 days ago · 4 km deep · 28 km away
  20. 1.64 km ENE of Interlaken, California · 13315 days ago · 6 km deep · 36 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc156394. Read Sat, Oct 3, 2026, 2:16 PM UTC.