California earthquakes

M2.6 earthquake 10 km WSW of Ridgemark, California

A magnitude 2.6 earthquake struck 10 km WSW of Ridgemark, California on Sun, Feb 8, 1987, 4:50 AM PST (12:50 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.8 12 km SE of Sunol, 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
2.6 (md), micro
Local time
UTC
1987-02-08 12:50:32 UTC
Depth
6.4 km (4.0 mi), shallow
Epicenter
36.764° N, 121.464° 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
±0.15
Depth from
From location
Station coverage gap
44°
Stations used
71

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 171 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.813 km ENE of East Foothills, California · 14461 days ago · 7 km deep · 78 km away
  2. 1.718 km NE of East Foothills, California · 14460 days ago · 8 km deep · 86 km away
  3. 2.213 km ENE of East Foothills, California · 14460 days ago · 7 km deep · 77 km away
  4. 2.812 km SE of Sunol, California · 14460 days ago · 10 km deep · 88 km away
  5. 1.613 km ENE of East Foothills, California · 14459 days ago · 7 km deep · 77 km away
  6. 2.010 km ESE of Gilroy, California · 14459 days ago · 8 km deep · 24 km away
  7. 1.619 km WSW of Three Rocks, California · 14459 days ago · 15 km deep · 86 km away
  8. 2.015 km SSE of Livermore, California · 14459 days ago · 4 km deep · 90 km away
  9. 1.77 km NNE of East Foothills, California · 14458 days ago · 7 km deep · 81 km away
  10. 1.812 km NNE of Morgan Hill, California · 14458 days ago · 5 km deep · 55 km away
  11. 1.612 km N of Morgan Hill, California · 14458 days ago · 4 km deep · 55 km away
  12. 2.712 km N of Morgan Hill, California · 14458 days ago · 6 km deep · 55 km away
  13. 1.718 km SSE of Tres Pinos, California · 14458 days ago · 10 km deep · 24 km away
  14. 3.322 km NNE of Soledad, California · 14458 days ago · 6 km deep · 29 km away
  15. 2.322 km NNE of Soledad, California · 14458 days ago · 5 km deep · 29 km away
  16. 2.722 km SSE of Tres Pinos, California · 14458 days ago · 6 km deep · 29 km away
  17. 2.722 km SSE of Tres Pinos, California · 14458 days ago · 5 km deep · 29 km away
  18. 1.922 km NNE of Soledad, California · 14458 days ago · 5 km deep · 29 km away
  19. 1.713 km ESE of East Foothills, California · 14458 days ago · 4 km deep · 66 km away
  20. 2.216 km SSE of Livermore, California · 14457 days ago · 6 km deep · 90 km away
  21. 1.822 km NNE of Soledad, California · 14457 days ago · 6 km deep · 29 km away
  22. 2.422 km NNE of Soledad, California · 14457 days ago · 5 km deep · 29 km away
  23. 1.624 km NE of Greenfield, California · 14457 days ago · 6 km deep · 50 km away
  24. 2.735 km WNW of Three Rocks, California · 14456 days ago · 7 km deep · 65 km away
  25. 1.924 km ENE of Soledad, California · 14456 days ago · 2 km deep · 46 km away
  26. 2.621 km NE of Soledad, California · 14454 days ago · 2 km deep · 35 km away
  27. 2.026 km NE of Soledad, California · 14454 days ago · 8 km deep · 35 km away
  28. 1.58 km ENE of San Martin, California · 14454 days ago · 7 km deep · 40 km away
  29. 1.914 km WSW of Soledad, California · 14454 days ago · 9 km deep · 45 km away
  30. 1.68 km NNE of Milpitas, California · 14454 days ago · 3 km deep · 89 km away
  31. 2.424 km ENE of Greenfield, California · 14453 days ago · 6 km deep · 56 km away
  32. 2.225 km ENE of Greenfield, California · 14453 days ago · 5 km deep · 56 km away
  33. 1.712 km SE of Sunol, California · 14453 days ago · 9 km deep · 88 km away
  34. 1.723 km ENE of Soledad, California · 14453 days ago · 4 km deep · 44 km away
  35. 2.412 km N of Morgan Hill, California · 14453 days ago · 5 km deep · 55 km away
  36. 2.05 km SW of Gilroy, California · 14453 days ago · 4 km deep · 27 km away
  37. 2.012 km NE of East Foothills, California · 14452 days ago · 7 km deep · 82 km away
  38. 1.813 km SSE of Tres Pinos, California · 14452 days ago · 5 km deep · 20 km away
  39. 1.917 km NE of East Foothills, California · 14452 days ago · 7 km deep · 85 km away
  40. 1.924 km NE of Soledad, California · 14452 days ago · 10 km deep · 39 km away
  41. 2.426 km ENE of Soledad, California · 14451 days ago · 7 km deep · 42 km away
  42. 1.68 km ENE of Gilroy, California · 14451 days ago · 6 km deep · 29 km away
  43. 1.85 km ENE of Aromas, California · 14451 days ago · 7 km deep · 20 km away
  44. 2.410 km S of Tres Pinos, California · 14451 days ago · 4 km deep · 15 km away
  45. 2.813 km ENE of East Foothills, California · 14451 days ago · 6 km deep · 78 km away
  46. 2.015 km SE of Tres Pinos, California · 14451 days ago · 12 km deep · 26 km away
  47. 3.913 km ENE of East Foothills, California · 14451 days ago · 8 km deep · 78 km away
  48. 3.113 km ENE of East Foothills, California · 14451 days ago · 7 km deep · 79 km away
  49. 1.812 km NE of East Foothills, California · 14451 days ago · 7 km deep · 81 km away
  50. 2.013 km ENE of East Foothills, California · 14450 days ago · 7 km deep · 79 km away
  51. 2.113 km ENE of East Foothills, California · 14450 days ago · 7 km deep · 78 km away
  52. 1.714 km NE of East Foothills, California · 14450 days ago · 7 km deep · 79 km away
  53. 1.713 km ENE of East Foothills, California · 14450 days ago · 8 km deep · 78 km away
  54. 1.613 km ENE of East Foothills, California · 14450 days ago · 8 km deep · 79 km away
  55. 1.614 km SSE of Livermore, California · 14450 days ago · 5 km deep · 92 km away
  56. 2.513 km ENE of East Foothills, California · 14450 days ago · 7 km deep · 76 km away
  57. 1.95 km SSW of Ridgemark, California · 14450 days ago · 7 km deep · 7 km away
  58. 1.622 km ENE of Soledad, California · 14449 days ago · 5 km deep · 44 km away
  59. 1.58 km ENE of Tres Pinos, California · 14449 days ago · 9 km deep · 22 km away
  60. 1.715 km SE of Tres Pinos, California · 14449 days ago · 11 km deep · 26 km away

The first 60 of 171.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc94267. Read Tue, Sep 22, 2026, 9:11 AM UTC.