California earthquakes

M1.5 earthquake 6 km NE of Ridgemark, California

A magnitude 1.5 earthquake struck 6 km NE of Ridgemark, California on Thu, Nov 12, 1987, 8:37 AM PST (16:37 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M4.5 28 km SW of South Dos Palos, 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
1.5 (md), micro
Local time
UTC
1987-11-12 16:37:12 UTC
Depth
4.1 km (2.5 mi), shallow
Epicenter
36.853° N, 121.307° 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
±0.17
Depth from
From location
Station coverage gap
58°
Stations used
27

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 177 in the 60 days after this one and 69 in the 30 days before it.

After

  1. 2.521 km NNE of Soledad, California · 14202 days ago · 8 km deep · 30 km away
  2. 1.98 km NE of Ridgemark, California · 14201 days ago · 6 km deep · 2 km away
  3. 1.614 km E of Seven Trees, California · 14200 days ago · 2 km deep · 59 km away
  4. 2.410 km SSW of Loyola, California · 14199 days ago · 6 km deep · 87 km away
  5. 2.811 km SW of Soledad, California · 14199 days ago · 13 km deep · 58 km away
  6. 1.811 km SW of Soledad, California · 14199 days ago · 13 km deep · 57 km away
  7. 2.56 km ENE of Hollister, California · 14198 days ago · 7 km deep · 4 km away
  8. 1.56 km ENE of Hollister, California · 14198 days ago · 7 km deep · 4 km away
  9. 2.641 km ENE of Soledad, California · 14198 days ago · 5 km deep · 46 km away
  10. 2.312 km SW of Soledad, California · 14198 days ago · 14 km deep · 58 km away
  11. 2.112 km SW of Soledad, California · 14198 days ago · 14 km deep · 58 km away
  12. 2.47 km NNE of Interlaken, California · 14198 days ago · 12 km deep · 41 km away
  13. 1.721 km NNE of Soledad, California · 14198 days ago · 7 km deep · 30 km away
  14. 2.717 km SSE of Tres Pinos, California · 14198 days ago · 8 km deep · 24 km away
  15. 2.022 km NNE of Soledad, California · 14198 days ago · 2 km deep · 30 km away
  16. 1.711 km SW of Soledad, California · 14198 days ago · 14 km deep · 56 km away
  17. 2.015 km E of Seven Trees, California · 14197 days ago · 3 km deep · 58 km away
  18. 2.321 km NE of Soledad, California · 14197 days ago · 6 km deep · 32 km away
  19. 1.611 km ESE of East Foothills, California · 14196 days ago · 7 km deep · 64 km away
  20. 1.824 km NE of Soledad, California · 14195 days ago · 8 km deep · 38 km away
  21. 1.822 km NE of Soledad, California · 14195 days ago · 8 km deep · 35 km away
  22. 1.5Central California · 14194 days ago · 8 km deep · 31 km away
  23. 1.53 km WNW of Ridgemark, California · 14194 days ago · 7 km deep · 9 km away
  24. 1.516 km NE of East Foothills, California · 14194 days ago · 2 km deep · 78 km away
  25. 2.35 km WSW of Gilroy, California · 14194 days ago · 3 km deep · 32 km away
  26. 1.87 km ENE of Hollister, California · 14194 days ago · 7 km deep · 3 km away
  27. 2.48 km SE of Alum Rock, California · 14193 days ago · 5 km deep · 65 km away
  28. 1.64 km ESE of Tres Pinos, California · 14193 days ago · 7 km deep · 9 km away
  29. 2.317 km SW of Gustine, California · 14193 days ago · 0 km deep · 36 km away
  30. 1.73 km S of Merced, California · 14192 days ago · 5 km deep · 87 km away
  31. 1.619 km WSW of Greenfield, California · 14192 days ago · 19 km deep · 66 km away
  32. 2.413 km NE of East Foothills, California · 14192 days ago · 6 km deep · 79 km away
  33. 2.524 km NE of Soledad, California · 14191 days ago · 7 km deep · 38 km away
  34. 1.58 km WNW of Davenport, California · 14191 days ago · 9 km deep · 89 km away
  35. 1.52 km WSW of San Juan Bautista, California · 14191 days ago · 4 km deep · 23 km away
  36. 2.322 km NNE of Soledad, California · 14190 days ago · 5 km deep · 30 km away
  37. 1.822 km NNE of Soledad, California · 14190 days ago · 6 km deep · 30 km away
  38. 1.5Northern California · 14189 days ago · 5 km deep · 82 km away
  39. 1.616 km SSE of Livermore, CA · 14189 days ago · 6 km deep · 85 km away
  40. 1.831 km ENE of Soledad, California · 14188 days ago · 7 km deep · 40 km away
  41. 1.62 km SSW of Hollister, California · 14188 days ago · 8 km deep · 9 km away
  42. 1.630 km ENE of Soledad, California · 14188 days ago · 7 km deep · 40 km away
  43. 1.78 km ESE of East Foothills, California · 14187 days ago · 8 km deep · 67 km away
  44. 1.822 km ESE of Big Sur, California · 14186 days ago · 17 km deep · 75 km away
  45. 1.729 km SW of South Dos Palos, California · 14186 days ago · 5 km deep · 39 km away
  46. 1.715 km SSE of Livermore, California · 14185 days ago · 2 km deep · 85 km away
  47. 1.711 km SSW of Mountain House, California · 14185 days ago · 14 km deep · 97 km away
  48. 1.612 km E of Livermore, California · 14185 days ago · 12 km deep · 95 km away
  49. 2.113 km SSW of Mountain House, California · 14185 days ago · 14 km deep · 96 km away
  50. 1.513 km E of Livermore, California · 14185 days ago · 12 km deep · 95 km away
  51. 2.025 km NNE of King City, California · 14185 days ago · 1 km deep · 58 km away
  52. 2.916 km SSE of Livermore, California · 14184 days ago · 2 km deep · 85 km away
  53. 1.814 km E of Seven Trees, California · 14184 days ago · 2 km deep · 59 km away
  54. 1.725 km NE of Greenfield, California · 14184 days ago · 8 km deep · 51 km away
  55. 3.318 km SSE of Livermore, California · 14184 days ago · 6 km deep · 83 km away
  56. 2.124 km NE of Greenfield, California · 14184 days ago · 0 km deep · 50 km away
  57. 2.0Central California · 14183 days ago · 5 km deep · 27 km away
  58. 2.716 km SSE of Tres Pinos, California · 14183 days ago · 5 km deep · 23 km away
  59. 1.715 km SSE of Tres Pinos, California · 14183 days ago · 4 km deep · 22 km away
  60. 1.75 km ENE of Fremont, California · 14182 days ago · 11 km deep · 96 km away

The first 60 of 177.

Before

  1. 1.521 km NE of Soledad, California · 14202 days ago · 8 km deep · 38 km away
  2. 1.68 km WNW of Davenport, California · 14202 days ago · 9 km deep · 89 km away
  3. 1.96 km ENE of Hollister, California · 14202 days ago · 5 km deep · 4 km away
  4. 2.16 km NE of East Foothills, California · 14204 days ago · 7 km deep · 75 km away
  5. 1.67 km NNE of East Foothills, California · 14204 days ago · 7 km deep · 79 km away
  6. 1.69 km NNE of Lockwood, California · 14205 days ago · 11 km deep · 96 km away
  7. 2.06 km E of East Foothills, California · 14205 days ago · 6 km deep · 71 km away
  8. 1.85 km NNE of Tres Pinos, California · 14206 days ago · 4 km deep · 2 km away
  9. 2.421 km NNE of Soledad, California · 14206 days ago · 7 km deep · 31 km away
  10. 1.85 km SE of Tres Pinos, California · 14206 days ago · 7 km deep · 11 km away
  11. 2.421 km NNE of Soledad, California · 14207 days ago · 7 km deep · 31 km away
  12. 1.921 km NNE of Soledad, California · 14207 days ago · 7 km deep · 30 km away
  13. 4.021 km NNE of Soledad, California · 14207 days ago · 9 km deep · 30 km away
  14. 2.112 km NNE of East Foothills, California · 14207 days ago · 7 km deep · 79 km away
  15. 2.713 km ENE of East Foothills, California · 14207 days ago · 4 km deep · 71 km away
  16. 1.510 km ESE of Gilroy, California · 14207 days ago · 4 km deep · 18 km away
  17. 1.56 km ENE of Hollister, California · 14208 days ago · 7 km deep · 5 km away
  18. 1.611 km SW of Soledad, California · 14209 days ago · 12 km deep · 58 km away
  19. 2.86 km ENE of Hollister, California · 14209 days ago · 8 km deep · 5 km away
  20. 1.621 km NNE of Soledad, California · 14210 days ago · 8 km deep · 30 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc108301. Read Wed, Sep 30, 2026, 7:33 AM UTC.