California earthquakes

M2.1 earthquake 6 km SW of Ridgemark, California

A magnitude 2.1 earthquake struck 6 km SW of Ridgemark, California on Wed, May 9, 1990, 12:42 PM PDT (19:42 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M4.1 6 km NE 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
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-05-09 19:42:35 UTC
Depth
8.9 km (5.5 mi), shallow
Epicenter
36.767° N, 121.413° 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
±0.17
Depth from
From location
Station coverage gap
36°
Stations used
56

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 178 in the 60 days after this one and 185 in the 30 days before it.

After

  1. 1.66 km WNW of Day Valley, California · 13295 days ago · 16 km deep · 56 km away
  2. 3.415 km E of Seven Trees, California · 13295 days ago · 6 km deep · 62 km away
  3. 1.510 km S of Tres Pinos, California · 13294 days ago · 3 km deep · 11 km away
  4. 1.615 km N of Morgan Hill, California · 13294 days ago · 5 km deep · 60 km away
  5. 1.54 km SSE of Lexington Hills, California · 13294 days ago · 11 km deep · 62 km away
  6. 2.23 km S of San Juan Bautista, California · 13294 days ago · 6 km deep · 12 km away
  7. 1.61 km ENE of Interlaken, California · 13293 days ago · 13 km deep · 34 km away
  8. 1.520 km SSE of Tres Pinos, California · 13293 days ago · 5 km deep · 23 km away
  9. 2.310 km WSW of Ridgemark, California · 13293 days ago · 8 km deep · 5 km away
  10. 1.62 km N of Aromas, California · 13292 days ago · 6 km deep · 25 km away
  11. 1.92 km S of San Juan Bautista, California · 13291 days ago · 6 km deep · 13 km away
  12. 2.14 km WNW of San Juan Bautista, California · 13291 days ago · 6 km deep · 18 km away
  13. 1.89 km S of Tres Pinos, California · 13291 days ago · 3 km deep · 10 km away
  14. 2.410 km WSW of Ridgemark, California · 13290 days ago · 8 km deep · 5 km away
  15. 1.636 km SSW of South Dos Palos, California · 13290 days ago · 6 km deep · 52 km away
  16. 1.624 km NE of Soledad, California · 13290 days ago · 11 km deep · 33 km away
  17. 2.29 km SW of Ridgemark, California · 13290 days ago · 8 km deep · 4 km away
  18. 1.710 km WSW of Ridgemark, California · 13290 days ago · 8 km deep · 5 km away
  19. 1.715 km E of Seven Trees, California · 13289 days ago · 5 km deep · 62 km away
  20. 3.014 km SSE of Tres Pinos, California · 13289 days ago · 6 km deep · 17 km away
  21. 1.6Central California · 13289 days ago · 9 km deep · 23 km away
  22. 3.215 km SSE of Tres Pinos, California · 13289 days ago · 7 km deep · 17 km away
  23. 2.515 km SSE of Tres Pinos, California · 13289 days ago · 6 km deep · 17 km away
  24. 2.315 km SSE of Tres Pinos, California · 13289 days ago · 6 km deep · 17 km away
  25. 3.67 km E of East Foothills, California · 13288 days ago · 8 km deep · 73 km away
  26. 2.421 km NE of Soledad, California · 13288 days ago · 6 km deep · 31 km away
  27. 1.8Northern California · 13287 days ago · 6 km deep · 93 km away
  28. 1.8Central California · 13287 days ago · 7 km deep · 17 km away
  29. 3.114 km SSE of Tres Pinos, California · 13287 days ago · 7 km deep · 17 km away
  30. 3.014 km SSE of Tres Pinos, California · 13287 days ago · 7 km deep · 17 km away
  31. 1.94 km SSE of San Juan Bautista, California · 13287 days ago · 5 km deep · 11 km away
  32. 3.114 km SSE of Tres Pinos, California · 13287 days ago · 7 km deep · 16 km away
  33. 2.54 km NNW of Aromas, California · 13287 days ago · 8 km deep · 28 km away
  34. 1.514 km SSE of Tres Pinos, California · 13287 days ago · 7 km deep · 16 km away
  35. 2.02 km N of Lexington Hills, California · 13287 days ago · 5 km deep · 68 km away
  36. 2.515 km SSE of Tres Pinos, California · 13287 days ago · 6 km deep · 18 km away
  37. 2.66 km SW of Ridgemark, California · 13286 days ago · 9 km deep · 0 km away
  38. 3.36 km SW of Ridgemark, California · 13286 days ago · 10 km deep · 0 km away
  39. 2.29 km NNW of Boulder Creek, California · 13285 days ago · 4 km deep · 83 km away
  40. 1.615 km SSE of Tres Pinos, California · 13285 days ago · 7 km deep · 18 km away
  41. 2.615 km SSE of Tres Pinos, California · 13285 days ago · 7 km deep · 17 km away
  42. 1.815 km SSE of Tres Pinos, California · 13284 days ago · 7 km deep · 17 km away
  43. 1.815 km SSE of Tres Pinos, California · 13284 days ago · 7 km deep · 17 km away
  44. 1.71 km W of Loyola, California · 13284 days ago · 3 km deep · 90 km away
  45. 2.224 km NE of Greenfield, California · 13284 days ago · 1 km deep · 48 km away
  46. 2.020 km SSE of Tres Pinos, California · 13284 days ago · 5 km deep · 23 km away
  47. 1.69 km WSW of Volta, California · 13283 days ago · 7 km deep · 49 km away
  48. 1.64 km E of Interlaken, California · 13283 days ago · 11 km deep · 31 km away
  49. 1.730 km ENE of Soledad, California · 13283 days ago · 8 km deep · 40 km away
  50. 1.62 km SSW of Lexington Hills, California · 13283 days ago · 11 km deep · 66 km away
  51. 1.91 km NE of Aromas, California · 13282 days ago · 5 km deep · 24 km away
  52. 1.715 km ESE of Tres Pinos, California · 13282 days ago · 1 km deep · 22 km away
  53. 1.92 km WSW of San Juan Bautista, California · 13282 days ago · 4 km deep · 16 km away
  54. 2.05 km ESE of Interlaken, California · 13281 days ago · 11 km deep · 30 km away
  55. 2.37 km S of Sunol, California · 13280 days ago · 10 km deep · 94 km away
  56. 1.823 km NE of Soledad, California · 13280 days ago · 9 km deep · 34 km away
  57. 2.331 km ENE of Soledad, California · 13280 days ago · 8 km deep · 40 km away
  58. 1.85 km SSW of Davenport, California · 13280 days ago · 3 km deep · 75 km away
  59. 2.610 km SW of Ridgemark, California · 13280 days ago · 8 km deep · 5 km away
  60. 1.65 km ESE of Interlaken, California · 13278 days ago · 11 km deep · 30 km away

The first 60 of 178.

Before

  1. 1.930 km NE of Greenfield, California · 13296 days ago · 5 km deep · 48 km away
  2. 1.615 km N of Morgan Hill, California · 13296 days ago · 6 km deep · 60 km away
  3. 1.621 km NE of Soledad, California · 13296 days ago · 8 km deep · 35 km away
  4. 2.31 km NE of Aromas, California · 13296 days ago · 5 km deep · 24 km away
  5. 1.86 km WNW of Volta, California · 13296 days ago · 7 km deep · 54 km away
  6. 2.823 km NE of King City, California · 13297 days ago · 4 km deep · 65 km away
  7. 2.68 km W of Volta, California · 13297 days ago · 3 km deep · 50 km away
  8. 2.88 km NNE of Day Valley, California · 13297 days ago · 4 km deep · 52 km away
  9. 2.121 km NE of Soledad, California · 13297 days ago · 3 km deep · 30 km away
  10. 1.64 km E of Interlaken, California · 13297 days ago · 10 km deep · 31 km away
  11. 1.91 km E of Aromas, California · 13297 days ago · 7 km deep · 23 km away
  12. 2.21 km ENE of Aromas, California · 13297 days ago · 7 km deep · 24 km away
  13. 1.98 km N of Day Valley, California · 13298 days ago · 4 km deep · 54 km away
  14. 2.45 km ESE of Interlaken, California · 13298 days ago · 8 km deep · 30 km away
  15. 1.624 km NE of Greenfield, California · 13299 days ago · 5 km deep · 47 km away
  16. 2.02 km N of Lexington Hills, California · 13299 days ago · 5 km deep · 68 km away
  17. 2.014 km ENE of East Foothills, California · 13300 days ago · 5 km deep · 76 km away
  18. 2.66 km S of Sunol, California · 13300 days ago · 7 km deep · 95 km away
  19. 1.625 km NE of Soledad, California · 13301 days ago · 6 km deep · 30 km away
  20. 1.523 km ENE of San Ardo, California · 13301 days ago · 7 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc157464. Read Sat, Oct 3, 2026, 2:07 PM UTC.