California earthquakes

M2.1 earthquake 6 km S of Three Rocks, California

A magnitude 2.1 earthquake struck 6 km S of Three Rocks, California on Sat, Oct 1, 1977, 1:15 AM PDT (08:15 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M2.5 21 km NNE of Soledad, California. This one was a foreshock.

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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), micro
Local time
UTC
1977-10-01 08:15:52 UTC
Depth
8.7 km (5.4 mi), shallow
Epicenter
36.448° N, 120.394° 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 0.6 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
209°, poorly surrounded by stations
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 138 in the 60 days after this one and 53 in the 30 days before it.

After

  1. 1.78 km SSE of San Lucas, California · 17888 days ago · 14 km deep · 70 km away
  2. 1.8Central California · 17888 days ago · 10 km deep · 36 km away
  3. 1.721 km NW of Parkfield, California · 17887 days ago · 2 km deep · 49 km away
  4. 1.911 km S of Coalinga, California · 17887 days ago · 5 km deep · 46 km away
  5. 1.724 km NE of Greenfield, California · 17886 days ago · 6 km deep · 57 km away
  6. 2.521 km NNE of Soledad, California · 17884 days ago · 8 km deep · 74 km away
  7. 2.227 km ENE of Soledad, California · 17883 days ago · 8 km deep · 62 km away
  8. 1.718 km NW of Parkfield, California · 17883 days ago · 4 km deep · 50 km away
  9. 1.83 km SW of Ridgemark, California · 17881 days ago · 5 km deep · 98 km away
  10. 2.024 km ENE of Soledad, California · 17881 days ago · 2 km deep · 60 km away
  11. 1.95 km NNW of El Nido, California · 17880 days ago · 2 km deep · 82 km away
  12. 2.318 km WSW of South Dos Palos, California · 17879 days ago · 3 km deep · 63 km away
  13. 2.524 km NE of Greenfield, California · 17876 days ago · 0 km deep · 56 km away
  14. 1.920 km NW of Parkfield, California · 17875 days ago · 4 km deep · 49 km away
  15. 1.723 km NW of Parkfield, California · 17874 days ago · 6 km deep · 48 km away
  16. 2.421 km NE of Soledad, California · 17874 days ago · 2 km deep · 68 km away
  17. 1.822 km NNE of San Ardo, California · 17873 days ago · 3 km deep · 45 km away
  18. 1.821 km NE of Soledad, California · 17873 days ago · 3 km deep · 70 km away
  19. 2.730 km NE of Soledad, California · 17873 days ago · 7 km deep · 60 km away
  20. 1.6Central California · 17873 days ago · 6 km deep · 70 km away
  21. 1.822 km SSE of Tres Pinos, California · 17873 days ago · 2 km deep · 75 km away
  22. 1.725 km NNE of King City, California · 17872 days ago · 6 km deep · 53 km away
  23. 1.923 km NE of Greenfield, California · 17872 days ago · 6 km deep · 59 km away
  24. 1.721 km NNE of Soledad, California · 17872 days ago · 7 km deep · 73 km away
  25. 3.522 km NNE of Soledad, California · 17871 days ago · 9 km deep · 75 km away
  26. 2.121 km NNE of Soledad, California · 17871 days ago · 8 km deep · 75 km away
  27. 2.422 km NNE of Soledad, California · 17871 days ago · 8 km deep · 75 km away
  28. 2.122 km NE of Soledad, California · 17870 days ago · 3 km deep · 72 km away
  29. 1.839 km SSW of South Dos Palos, California · 17870 days ago · 3 km deep · 50 km away
  30. 2.424 km ENE of Soledad, California · 17869 days ago · 3 km deep · 61 km away
  31. 2.125 km NE of Greenfield, California · 17869 days ago · 1 km deep · 57 km away
  32. 1.623 km ENE of King City, California · 17868 days ago · 8 km deep · 47 km away
  33. 1.816 km NW of Parkfield, California · 17868 days ago · 4 km deep · 52 km away
  34. 1.616 km NW of Parkfield, California · 17868 days ago · 3 km deep · 52 km away
  35. 1.624 km NE of Greenfield, California · 17868 days ago · 6 km deep · 59 km away
  36. 1.629 km WNW of Coalinga, California · 17868 days ago · 9 km deep · 35 km away
  37. 1.99 km SSE of Parkfield, California · 17868 days ago · 5 km deep · 69 km away
  38. 1.66 km ENE of Coalinga, California · 17868 days ago · 12 km deep · 33 km away
  39. 2.03 km WNW of San Ardo, California · 17866 days ago · 11 km deep · 68 km away
  40. 2.115 km SSE of Tres Pinos, California · 17865 days ago · 3 km deep · 82 km away
  41. 3.115 km SSE of Tres Pinos, California · 17865 days ago · 3 km deep · 82 km away
  42. 1.727 km ENE of Soledad, California · 17862 days ago · 9 km deep · 62 km away
  43. 2.218 km E of Tres Pinos, California · 17862 days ago · 0 km deep · 74 km away
  44. 3.321 km NE of Soledad, California · 17861 days ago · 5 km deep · 72 km away
  45. 2.414 km SSE of Tres Pinos, California · 17861 days ago · 4 km deep · 83 km away
  46. 1.614 km SSE of Tres Pinos, California · 17861 days ago · 3 km deep · 83 km away
  47. 1.912 km S of Tres Pinos, California · 17861 days ago · 3 km deep · 85 km away
  48. 1.73 km SE of San Ardo, California · 17861 days ago · 13 km deep · 67 km away
  49. 2.19 km S of Tres Pinos, California · 17861 days ago · 2 km deep · 89 km away
  50. 1.719 km SSE of Tres Pinos, California · 17860 days ago · 10 km deep · 79 km away
  51. 1.622 km NE of San Lucas, California · 17860 days ago · 5 km deep · 46 km away
  52. 2.215 km SSE of Tres Pinos, California · 17859 days ago · 3 km deep · 82 km away
  53. 2.123 km ENE of Soledad, California · 17859 days ago · 3 km deep · 61 km away
  54. 2.521 km NW of Parkfield, California · 17859 days ago · 4 km deep · 49 km away
  55. 2.321 km NE of Soledad, California · 17859 days ago · 2 km deep · 67 km away
  56. 1.923 km ENE of Soledad, California · 17858 days ago · 5 km deep · 62 km away
  57. 1.625 km ENE of Greenfield, California · 17857 days ago · 5 km deep · 53 km away
  58. 1.518 km NW of Parkfield, California · 17857 days ago · 3 km deep · 51 km away
  59. 1.724 km ENE of Soledad, California · 17857 days ago · 4 km deep · 61 km away
  60. 1.623 km NE of Greenfield, California · 17856 days ago · 5 km deep · 58 km away

The first 60 of 138.

Before

  1. 2.530 km ENE of Soledad, California · 17889 days ago · 7 km deep · 59 km away
  2. 2.330 km ENE of Soledad, California · 17890 days ago · 7 km deep · 59 km away
  3. 2.630 km ENE of Soledad, California · 17890 days ago · 7 km deep · 59 km away
  4. 1.630 km ENE of Soledad, California · 17890 days ago · 7 km deep · 60 km away
  5. 1.620 km NW of Parkfield, California · 17892 days ago · 4 km deep · 50 km away
  6. 1.724 km NE of Greenfield, California · 17893 days ago · 5 km deep · 58 km away
  7. 1.713 km S of Tres Pinos, California · 17893 days ago · 3 km deep · 84 km away
  8. 2.430 km NE of Soledad, California · 17894 days ago · 7 km deep · 61 km away
  9. 1.715 km E of Tres Pinos, California · 17894 days ago · 4 km deep · 78 km away
  10. 2.033 km SW of South Dos Palos, California · 17895 days ago · 2 km deep · 56 km away
  11. 2.821 km NE of Soledad, California · 17895 days ago · 5 km deep · 72 km away
  12. 2.921 km NE of Soledad, California · 17895 days ago · 5 km deep · 72 km away
  13. 2.324 km ENE of Greenfield, California · 17895 days ago · 3 km deep · 55 km away
  14. 2.527 km NE of Soledad, California · 17895 days ago · 7 km deep · 65 km away
  15. 1.98 km SSW of Ridgemark, California · 17896 days ago · 7 km deep · 97 km away
  16. 1.7Central California · 17896 days ago · 12 km deep · 67 km away
  17. 1.522 km ENE of San Lucas, California · 17896 days ago · 7 km deep · 44 km away
  18. 2.323 km ENE of San Lucas, California · 17896 days ago · 5 km deep · 43 km away
  19. 1.521 km NE of Soledad, California · 17897 days ago · 8 km deep · 67 km away
  20. 1.6Central California · 17897 days ago · 6 km deep · 45 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1037071. Read Tue, Sep 22, 2026, 8:46 PM UTC.