California earthquakes

M1.9 earthquake 5 km SSW of Ridgemark, California

A magnitude 1.9 earthquake struck 5 km SSW of Ridgemark, California on Sun, Mar 1, 1987, 11:21 AM PST (19:21 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.4 15 km SSE of Livermore, 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
1.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-03-01 19:21:59 UTC
Depth
7.2 km (4.5 mi), shallow
Epicenter
36.768° N, 121.389° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
40°
Stations used
39

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 167 in the 60 days after this one and 131 in the 30 days before it.

After

  1. 1.622 km ENE of Soledad, California · 14458 days ago · 5 km deep · 39 km away
  2. 1.58 km ENE of Tres Pinos, California · 14458 days ago · 9 km deep · 15 km away
  3. 1.715 km SE of Tres Pinos, California · 14458 days ago · 11 km deep · 20 km away
  4. 1.68 km SSE of Pescadero, California · 14457 days ago · 16 km deep · 97 km away
  5. 1.518 km SSE of Livermore, California · 14457 days ago · 7 km deep · 88 km away
  6. 2.221 km NE of Soledad, California · 14457 days ago · 6 km deep · 27 km away
  7. 2.022 km NNE of Soledad, California · 14457 days ago · 4 km deep · 25 km away
  8. 1.78 km ENE of Hollister, California · 14456 days ago · 7 km deep · 14 km away
  9. 2.8Central California · 14456 days ago · 5 km deep · 13 km away
  10. 2.3Northern California · 14456 days ago · 7 km deep · 81 km away
  11. 2.010 km SSW of San Lucas, California · 14456 days ago · 12 km deep · 86 km away
  12. 1.718 km NE of East Foothills, California · 14455 days ago · 5 km deep · 86 km away
  13. 2.922 km NE of Soledad, California · 14455 days ago · 3 km deep · 27 km away
  14. 2.118 km NE of East Foothills, California · 14454 days ago · 6 km deep · 86 km away
  15. 1.818 km NE of East Foothills, California · 14454 days ago · 7 km deep · 87 km away
  16. 1.527 km ENE of Soledad, California · 14453 days ago · 9 km deep · 37 km away
  17. 1.725 km NW of Coalinga, California · 14453 days ago · 7 km deep · 91 km away
  18. 2.115 km E of Seven Trees, California · 14453 days ago · 6 km deep · 62 km away
  19. 2.423 km NE of Soledad, California · 14453 days ago · 11 km deep · 31 km away
  20. 1.7Near the coast of Central California · 14452 days ago · 11 km deep · 55 km away
  21. 2.113 km ENE of East Foothills, California · 14451 days ago · 7 km deep · 80 km away
  22. 1.821 km NE of Soledad, California · 14449 days ago · 5 km deep · 31 km away
  23. 3.222 km NNE of Soledad, California · 14449 days ago · 6 km deep · 25 km away
  24. 1.722 km NNE of Soledad, California · 14449 days ago · 6 km deep · 25 km away
  25. 2.822 km NNE of Soledad, California · 14449 days ago · 6 km deep · 25 km away
  26. 1.722 km NNE of Soledad, California · 14449 days ago · 5 km deep · 25 km away
  27. 1.627 km NE of Soledad, California · 14449 days ago · 7 km deep · 32 km away
  28. 1.718 km NE of East Foothills, California · 14449 days ago · 7 km deep · 87 km away
  29. 1.529 km ENE of Soledad, California · 14448 days ago · 7 km deep · 37 km away
  30. 1.66 km NE of Ridgemark, California · 14448 days ago · 2 km deep · 12 km away
  31. 1.815 km SSE of Livermore, California · 14448 days ago · 4 km deep · 92 km away
  32. 1.86 km ENE of Hollister, California · 14448 days ago · 6 km deep · 13 km away
  33. 1.622 km NNE of Soledad, California · 14447 days ago · 6 km deep · 24 km away
  34. 1.96 km NE of Tres Pinos, California · 14447 days ago · 8 km deep · 12 km away
  35. 1.79 km SSW of Tres Pinos, California · 14447 days ago · 3 km deep · 8 km away
  36. 1.69 km SE of Sunol, California · 14446 days ago · 10 km deep · 93 km away
  37. 1.912 km S of Tres Pinos, California · 14446 days ago · 5 km deep · 13 km away
  38. 1.623 km ENE of Soledad, California · 14445 days ago · 3 km deep · 39 km away
  39. 1.918 km NE of East Foothills, California · 14445 days ago · 5 km deep · 86 km away
  40. 2.028 km NE of Soledad, California · 14445 days ago · 5 km deep · 34 km away
  41. 1.821 km NE of Soledad, California · 14444 days ago · 3 km deep · 27 km away
  42. 2.020 km ENE of East Foothills, California · 14444 days ago · 7 km deep · 82 km away
  43. 1.59 km NNE of Hollister, California · 14444 days ago · 7 km deep · 18 km away
  44. 2.311 km S of Tres Pinos, California · 14443 days ago · 4 km deep · 12 km away
  45. 1.812 km S of Tres Pinos, California · 14443 days ago · 4 km deep · 12 km away
  46. 1.618 km SSE of Livermore, California · 14443 days ago · 4 km deep · 89 km away
  47. 1.62 km ENE of San Ardo, California · 14443 days ago · 9 km deep · 94 km away
  48. 1.66 km NE of Ridgemark, California · 14443 days ago · 4 km deep · 12 km away
  49. 1.716 km SSE of Tres Pinos, California · 14442 days ago · 9 km deep · 17 km away
  50. 1.524 km NE of Greenfield, California · 14442 days ago · 7 km deep · 47 km away
  51. 2.420 km SSE of Tres Pinos, California · 14442 days ago · 5 km deep · 22 km away
  52. 2.522 km NE of Soledad, California · 14442 days ago · 5 km deep · 27 km away
  53. 1.85 km NNE of Tres Pinos, California · 14441 days ago · 6 km deep · 11 km away
  54. 1.616 km SSE of Livermore, California · 14441 days ago · 6 km deep · 91 km away
  55. 1.820 km SSE of Tres Pinos, California · 14441 days ago · 5 km deep · 22 km away
  56. 1.66 km ENE of Hollister, California · 14441 days ago · 6 km deep · 14 km away
  57. 2.710 km SW of Ridgemark, California · 14440 days ago · 8 km deep · 7 km away
  58. 1.916 km S of Three Rocks, California · 14440 days ago · 12 km deep · 99 km away
  59. 1.623 km NE of King City, California · 14440 days ago · 6 km deep · 57 km away
  60. 2.417 km NE of East Foothills, California · 14440 days ago · 6 km deep · 86 km away

The first 60 of 167.

Before

  1. 2.513 km ENE of East Foothills, California · 14459 days ago · 7 km deep · 78 km away
  2. 1.614 km SSE of Livermore, California · 14459 days ago · 5 km deep · 93 km away
  3. 1.613 km ENE of East Foothills, California · 14459 days ago · 8 km deep · 80 km away
  4. 1.713 km ENE of East Foothills, California · 14459 days ago · 8 km deep · 80 km away
  5. 1.714 km NE of East Foothills, California · 14459 days ago · 7 km deep · 80 km away
  6. 2.113 km ENE of East Foothills, California · 14459 days ago · 7 km deep · 80 km away
  7. 2.013 km ENE of East Foothills, California · 14459 days ago · 7 km deep · 80 km away
  8. 1.812 km NE of East Foothills, California · 14459 days ago · 7 km deep · 83 km away
  9. 3.113 km ENE of East Foothills, California · 14460 days ago · 7 km deep · 80 km away
  10. 3.913 km ENE of East Foothills, California · 14460 days ago · 8 km deep · 80 km away
  11. 2.015 km SE of Tres Pinos, California · 14460 days ago · 12 km deep · 20 km away
  12. 2.813 km ENE of East Foothills, California · 14460 days ago · 6 km deep · 80 km away
  13. 2.410 km S of Tres Pinos, California · 14460 days ago · 4 km deep · 10 km away
  14. 1.85 km ENE of Aromas, California · 14460 days ago · 7 km deep · 24 km away
  15. 1.68 km ENE of Gilroy, California · 14460 days ago · 6 km deep · 30 km away
  16. 2.426 km ENE of Soledad, California · 14460 days ago · 7 km deep · 37 km away
  17. 1.924 km NE of Soledad, California · 14461 days ago · 10 km deep · 34 km away
  18. 1.917 km NE of East Foothills, California · 14461 days ago · 7 km deep · 86 km away
  19. 1.813 km SSE of Tres Pinos, California · 14461 days ago · 5 km deep · 15 km away
  20. 2.012 km NE of East Foothills, California · 14461 days ago · 7 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc95763. Read Thu, Oct 1, 2026, 5:59 AM UTC.