California earthquakes

M1.6 earthquake 5 km SW of Ridgemark, California

A magnitude 1.6 earthquake struck 5 km SW of Ridgemark, California on Sun, Jul 12, 1987, 7:00 AM PDT (14:00 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M1.7 24 km NE of Greenfield, 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), micro
Local time
UTC
1987-07-12 14:00:43 UTC
Depth
11.1 km (6.9 mi), shallow
Epicenter
36.780° N, 121.419° 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, 0.5 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
36°
Stations used
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 43 in the 30 days before it.

After

  1. 1.724 km NE of Greenfield, California · 14317 days ago · 0 km deep · 52 km away
  2. 2.917 km NW of Diablo Grande, California · 14317 days ago · 5 km deep · 83 km away
  3. 1.814 km E of Seven Trees, California · 14316 days ago · 3 km deep · 61 km away
  4. 1.814 km N of Morgan Hill, California · 14316 days ago · 6 km deep · 57 km away
  5. 1.716 km NE of Gonzales, California · 14315 days ago · 11 km deep · 24 km away
  6. 1.59 km NE of Gilroy, California · 14314 days ago · 8 km deep · 31 km away
  7. 2.49 km NE of San Martin, California · 14313 days ago · 7 km deep · 43 km away
  8. 2.58 km NE of Morgan Hill, California · 14313 days ago · 3 km deep · 47 km away
  9. 1.73 km N of Interlaken, California · 14313 days ago · 13 km deep · 35 km away
  10. 1.78 km NE of Morgan Hill, California · 14313 days ago · 3 km deep · 47 km away
  11. 1.812 km N of Morgan Hill, California · 14312 days ago · 4 km deep · 55 km away
  12. 1.914 km NE of East Foothills, California · 14312 days ago · 9 km deep · 79 km away
  13. 2.521 km NE of Soledad, California · 14312 days ago · 7 km deep · 30 km away
  14. 2.121 km NE of Soledad, California · 14311 days ago · 6 km deep · 30 km away
  15. 2.07 km E of East Foothills, California · 14311 days ago · 7 km deep · 73 km away
  16. 1.924 km ENE of Soledad, California · 14309 days ago · 2 km deep · 44 km away
  17. 1.715 km SSE of Livermore, California · 14308 days ago · 3 km deep · 90 km away
  18. 1.621 km NE of Soledad, California · 14308 days ago · 3 km deep · 34 km away
  19. 1.724 km NE of King City, California · 14307 days ago · 5 km deep · 65 km away
  20. 1.59 km ESE of Seven Trees, California · 14307 days ago · 4 km deep · 59 km away
  21. 2.415 km SSE of Livermore, California · 14306 days ago · 2 km deep · 90 km away
  22. 2.518 km NE of East Foothills, California · 14306 days ago · 5 km deep · 85 km away
  23. 2.615 km SSE of Livermore, California · 14306 days ago · 2 km deep · 89 km away
  24. 1.98 km ENE of Milpitas, California · 14306 days ago · 5 km deep · 85 km away
  25. 1.64 km ESE of Tres Pinos, California · 14305 days ago · 6 km deep · 13 km away
  26. 1.69 km NNE of Lockwood, California · 14304 days ago · 11 km deep · 91 km away
  27. 1.518 km NE of East Foothills, California · 14304 days ago · 6 km deep · 84 km away
  28. 1.615 km E of Seven Trees, California · 14303 days ago · 6 km deep · 61 km away
  29. 2.86 km E of East Foothills, California · 14301 days ago · 6 km deep · 73 km away
  30. 1.87 km NNE of East Foothills, California · 14301 days ago · 7 km deep · 82 km away
  31. 1.89 km SE of San Juan Bautista, California · 14301 days ago · 7 km deep · 5 km away
  32. 1.812 km S of Tres Pinos, California · 14300 days ago · 6 km deep · 15 km away
  33. 1.714 km SSE of Big Sur, California · 14299 days ago · 5 km deep · 74 km away
  34. 1.5Northern California · 14299 days ago · 6 km deep · 60 km away
  35. 2.015 km E of Seven Trees, California · 14299 days ago · 6 km deep · 61 km away
  36. 1.526 km S of Big Sur, California · 14298 days ago · 12 km deep · 89 km away
  37. 1.615 km ESE of East Foothills, California · 14298 days ago · 2 km deep · 65 km away
  38. 1.724 km NE of Greenfield, California · 14296 days ago · 7 km deep · 46 km away
  39. 1.616 km E of Seven Trees, California · 14296 days ago · 6 km deep · 59 km away
  40. 1.921 km NE of Soledad, California · 14295 days ago · 6 km deep · 35 km away
  41. 1.77 km SE of Lexington Hills, California · 14295 days ago · 14 km deep · 58 km away
  42. 2.68 km NE of San Martin, California · 14294 days ago · 8 km deep · 40 km away
  43. 1.75 km NNE of Tres Pinos, California · 14294 days ago · 4 km deep · 13 km away
  44. 2.24 km SSE of Portola Valley, California · 14293 days ago · 10 km deep · 95 km away
  45. 1.84 km SSE of Portola Valley, California · 14292 days ago · 10 km deep · 95 km away
  46. 2.224 km NE of San Ardo, California · 14292 days ago · 8 km deep · 87 km away
  47. 1.741 km W of Three Rocks, California · 14291 days ago · 5 km deep · 57 km away
  48. 1.918 km SSE of Livermore, California · 14291 days ago · 7 km deep · 86 km away
  49. 2.319 km S of Big Sur, California · 14290 days ago · 16 km deep · 85 km away
  50. 1.610 km SW of Ridgemark, California · 14290 days ago · 7 km deep · 4 km away
  51. 1.726 km SW of Firebaugh, California · 14290 days ago · 10 km deep · 64 km away
  52. 1.76 km ESE of San Lucas, California · 14289 days ago · 9 km deep · 85 km away
  53. 1.93 km S of San Juan Bautista, California · 14289 days ago · 6 km deep · 11 km away
  54. 2.027 km WSW of Lockwood, California · 14289 days ago · 10 km deep · 99 km away
  55. 1.717 km NE of East Foothills, California · 14289 days ago · 6 km deep · 84 km away
  56. 1.610 km NNW of Hollister, California · 14289 days ago · 4 km deep · 18 km away
  57. 2.11 km SSE of Tres Pinos, California · 14289 days ago · 8 km deep · 9 km away
  58. 1.519 km SSE of Livermore, California · 14288 days ago · 5 km deep · 86 km away
  59. 2.60 km WNW of Sand City, California · 14286 days ago · 2 km deep · 43 km away
  60. 1.821 km NE of Soledad, California · 14286 days ago · 6 km deep · 35 km away

The first 60 of 113.

Before

  1. 1.923 km ENE of Soledad, California · 14319 days ago · 5 km deep · 44 km away
  2. 1.924 km ENE of Greenfield, California · 14319 days ago · 5 km deep · 53 km away
  3. 1.519 km SSE of Livermore, California · 14319 days ago · 3 km deep · 86 km away
  4. 2.412 km ESE of East Foothills, California · 14319 days ago · 6 km deep · 65 km away
  5. 2.221 km SSE of Tres Pinos, California · 14319 days ago · 4 km deep · 25 km away
  6. 1.522 km NE of Soledad, California · 14320 days ago · 2 km deep · 38 km away
  7. 1.922 km NE of San Lucas, California · 14321 days ago · 7 km deep · 75 km away
  8. 1.88 km NE of San Juan Bautista, California · 14321 days ago · 8 km deep · 14 km away
  9. 2.115 km SSE of Livermore, California · 14321 days ago · 2 km deep · 90 km away
  10. 1.715 km SSE of Livermore, California · 14321 days ago · 2 km deep · 90 km away
  11. 2.515 km SSE of Livermore, California · 14321 days ago · 2 km deep · 90 km away
  12. 1.615 km SSE of Livermore, California · 14322 days ago · 3 km deep · 90 km away
  13. 2.013 km N of Morgan Hill, California · 14323 days ago · 5 km deep · 56 km away
  14. 1.95 km SW of Gilroy, California · 14323 days ago · 7 km deep · 27 km away
  15. 1.67 km ENE of Gilroy, California · 14323 days ago · 6 km deep · 30 km away
  16. 1.612 km N of Morgan Hill, California · 14323 days ago · 7 km deep · 55 km away
  17. 3.613 km N of Morgan Hill, California · 14323 days ago · 6 km deep · 56 km away
  18. 1.54 km NE of Tres Pinos, California · 14324 days ago · 9 km deep · 12 km away
  19. 2.113 km N of Morgan Hill, California · 14324 days ago · 5 km deep · 56 km away
  20. 1.616 km NW of Big Sur, California · 14324 days ago · 10 km deep · 62 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc103003. Read Wed, Sep 23, 2026, 11:59 PM UTC.