California earthquakes

M1.6 earthquake 6 km NE of Ridgemark, California

A magnitude 1.6 earthquake struck 6 km NE of Ridgemark, California on Mon, Apr 2, 1990, 6:34 AM PDT (13:34 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.4 5 km NNW of Aromas, 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-04-02 13:34:13 UTC
Depth
9.8 km (6.1 mi), shallow
Epicenter
36.856° N, 121.324° 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, 0.3 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
82°
Stations used
37

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 189 in the 60 days after this one and 115 in the 30 days before it.

After

  1. 2.122 km WNW of Big Sur, California · 13333 days ago · 11 km deep · 84 km away
  2. 2.021 km E of Tres Pinos, California · 13332 days ago · 4 km deep · 21 km away
  3. 2.85 km WNW of San Juan Bautista, California · 13332 days ago · 7 km deep · 24 km away
  4. 2.324 km NE of Greenfield, California · 13332 days ago · 7 km deep · 48 km away
  5. 1.92 km SW of San Juan Bautista, California · 13332 days ago · 8 km deep · 21 km away
  6. 2.02 km SW of San Juan Bautista, California · 13332 days ago · 8 km deep · 21 km away
  7. 1.714 km N of Morgan Hill, California · 13331 days ago · 7 km deep · 53 km away
  8. 1.622 km NE of Soledad, California · 13331 days ago · 9 km deep · 39 km away
  9. 1.72 km W of Ridgemark, California · 13331 days ago · 7 km deep · 8 km away
  10. 1.93 km SW of Lexington Hills, California · 13331 days ago · 13 km deep · 68 km away
  11. 1.72 km NNW of Seacliff, California · 13330 days ago · 4 km deep · 56 km away
  12. 2.44 km ESE of Interlaken, California · 13330 days ago · 11 km deep · 33 km away
  13. 1.62 km SW of Lexington Hills, California · 13330 days ago · 14 km deep · 68 km away
  14. 1.63 km ENE of Tres Pinos, California · 13330 days ago · 9 km deep · 7 km away
  15. 1.51 km WSW of Freedom, California · 13330 days ago · 6 km deep · 42 km away
  16. 2.83 km W of San Juan Bautista, California · 13329 days ago · 7 km deep · 23 km away
  17. 1.95 km NNE of Tres Pinos, California · 13328 days ago · 4 km deep · 4 km away
  18. 1.87 km N of Day Valley, California · 13328 days ago · 5 km deep · 56 km away
  19. 1.816 km NW of Diablo Grande, California · 13328 days ago · 6 km deep · 71 km away
  20. 1.511 km S of Tres Pinos, California · 13328 days ago · 8 km deep · 19 km away
  21. 4.01 km NNE of Aromas, California · 13328 days ago · 6 km deep · 28 km away
  22. 1.62 km NNE of Aromas, California · 13328 days ago · 5 km deep · 28 km away
  23. 2.81 km ENE of Aromas, California · 13328 days ago · 5 km deep · 27 km away
  24. 1.98 km SSE of San Juan Bautista, California · 13327 days ago · 10 km deep · 19 km away
  25. 1.920 km S of Big Sur, California · 13327 days ago · 17 km deep · 97 km away
  26. 1.816 km S of Davenport, California · 13327 days ago · 2 km deep · 75 km away
  27. 1.921 km NE of Soledad, California · 13326 days ago · 6 km deep · 33 km away
  28. 2.93 km NNW of Seacliff, California · 13326 days ago · 5 km deep · 56 km away
  29. 2.25 km WSW of Davenport, California · 13326 days ago · 9 km deep · 84 km away
  30. 2.75 km NNW of Aromas, California · 13326 days ago · 7 km deep · 32 km away
  31. 1.95 km NNW of Aromas, California · 13326 days ago · 7 km deep · 32 km away
  32. 2.15 km NNW of Aromas, California · 13326 days ago · 7 km deep · 32 km away
  33. 2.35 km NNW of Aromas, California · 13326 days ago · 7 km deep · 32 km away
  34. 2.313 km SSE of Tres Pinos, California · 13326 days ago · 2 km deep · 21 km away
  35. 3.03 km N of Aromas, California · 13326 days ago · 6 km deep · 30 km away
  36. 2.03 km SW of Hollister, California · 13326 days ago · 7 km deep · 9 km away
  37. 2.05 km SW of Monte Sereno, California · 13326 days ago · 14 km deep · 75 km away
  38. 1.82 km ESE of Aromas, California · 13326 days ago · 6 km deep · 26 km away
  39. 2.52 km ESE of Aromas, California · 13326 days ago · 7 km deep · 26 km away
  40. 3.62 km ESE of Aromas, California · 13326 days ago · 7 km deep · 26 km away
  41. 2.23 km ESE of Aromas, California · 13325 days ago · 7 km deep · 25 km away
  42. 2.43 km ESE of Aromas, California · 13325 days ago · 7 km deep · 25 km away
  43. 1.84 km NW of Day Valley, California · 13325 days ago · 16 km deep · 57 km away
  44. 2.71 km ENE of Interlaken, CA · 13325 days ago · 13 km deep · 37 km away
  45. 1.9Central California · 13325 days ago · 6 km deep · 40 km away
  46. 2.32 km ESE of Aromas, California · 13325 days ago · 7 km deep · 26 km away
  47. 3.02 km ESE of Aromas, California · 13325 days ago · 7 km deep · 26 km away
  48. 2.12 km ESE of Aromas, California · 13325 days ago · 7 km deep · 26 km away
  49. 1.83 km SW of Hollister, California · 13325 days ago · 6 km deep · 9 km away
  50. 1.85 km WNW of Volta, California · 13324 days ago · 7 km deep · 41 km away
  51. 1.522 km NE of San Ardo, California · 13324 days ago · 4 km deep · 92 km away
  52. 2.014 km SSE of Tres Pinos, California · 13324 days ago · 4 km deep · 22 km away
  53. 2.812 km N of Morgan Hill, California · 13324 days ago · 5 km deep · 50 km away
  54. 3.04 km ESE of Interlaken, California · 13323 days ago · 12 km deep · 33 km away
  55. 2.34 km ESE of Interlaken, California · 13323 days ago · 12 km deep · 33 km away
  56. 1.95 km ESE of Interlaken, CA · 13323 days ago · 12 km deep · 33 km away
  57. 2.522 km ENE of Soledad, California · 13323 days ago · 5 km deep · 43 km away
  58. 2.69 km ESE of East Foothills, California · 13323 days ago · 7 km deep · 65 km away
  59. 1.615 km E of Seven Trees, California · 13323 days ago · 2 km deep · 57 km away
  60. 1.83 km SW of Hollister, California · 13322 days ago · 7 km deep · 9 km away

The first 60 of 189.

Before

  1. 1.635 km W of Three Rocks, California · 13334 days ago · 4 km deep · 59 km away
  2. 1.73 km SW of Lexington Hills, California · 13334 days ago · 13 km deep · 68 km away
  3. 2.52 km W of San Juan Bautista, California · 13334 days ago · 3 km deep · 22 km away
  4. 2.614 km N of Morgan Hill, California · 13334 days ago · 6 km deep · 53 km away
  5. 2.52 km SW of San Juan Bautista, California · 13334 days ago · 8 km deep · 21 km away
  6. 1.824 km NE of Greenfield, California · 13334 days ago · 5 km deep · 49 km away
  7. 2.15 km SSW of Tres Pinos, California · 13335 days ago · 8 km deep · 12 km away
  8. 3.123 km NE of San Ardo, California · 13335 days ago · 8 km deep · 93 km away
  9. 1.92 km WNW of San Juan Bautista, California · 13336 days ago · 6 km deep · 21 km away
  10. 1.63 km W of Lexington Hills, California · 13336 days ago · 12 km deep · 70 km away
  11. 1.822 km ENE of Soledad, California · 13336 days ago · 4 km deep · 43 km away
  12. 1.86 km WNW of Day Valley, California · 13336 days ago · 17 km deep · 58 km away
  13. 1.78 km SE of San Juan Bautista, California · 13336 days ago · 4 km deep · 17 km away
  14. 1.72 km N of Interlaken, California · 13337 days ago · 14 km deep · 39 km away
  15. 1.616 km NNE of Soledad, California · 13337 days ago · 6 km deep · 33 km away
  16. 1.62 km SW of Loyola, California · 13337 days ago · 5 km deep · 88 km away
  17. 1.92 km SSW of San Juan Bautista, California · 13337 days ago · 6 km deep · 20 km away
  18. 2.529 km ENE of Soledad, California · 13337 days ago · 8 km deep · 41 km away
  19. 2.44 km ENE of Tres Pinos, California · 13337 days ago · 5 km deep · 7 km away
  20. 1.94 km W of Lexington Hills, California · 13337 days ago · 13 km deep · 71 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1174694. Read Sat, Oct 3, 2026, 3:10 PM UTC.