California earthquakes

M1.7 earthquake 23 km W of Three Rocks, California

A magnitude 1.7 earthquake struck 23 km W of Three Rocks, California on Mon, Apr 21, 1986, 4:49 PM PST (00:49 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M4.7 18 km SSE of Tres Pinos, 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
1.7 (md), micro
Local time
UTC
1986-04-22 00:49:17 UTC
Depth
9.4 km (5.8 mi), shallow
Epicenter
36.527° N, 120.652° 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 3.5 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
290°, poorly surrounded by stations
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 191 in the 60 days after this one and 110 in the 30 days before it.

After

  1. 1.56 km NE of Ridgemark, California · 14770 days ago · 6 km deep · 69 km away
  2. 1.814 km SE of Parkfield, California · 14769 days ago · 4 km deep · 86 km away
  3. 2.18 km SSW of Tres Pinos, California · 14769 days ago · 3 km deep · 68 km away
  4. 1.512 km NNW of Coalinga, California · 14769 days ago · 7 km deep · 39 km away
  5. 2.25 km SSE of Huron, California · 14769 days ago · 7 km deep · 66 km away
  6. 1.712 km NNW of Coalinga, California · 14769 days ago · 8 km deep · 38 km away
  7. 2.224 km NE of Greenfield, California · 14769 days ago · 7 km deep · 36 km away
  8. 2.08 km S of Huron, California · 14769 days ago · 8 km deep · 66 km away
  9. 1.94 km WNW of San Juan Bautista, California · 14769 days ago · 5 km deep · 91 km away
  10. 3.010 km WSW of Ridgemark, California · 14769 days ago · 6 km deep · 77 km away
  11. 1.99 km S of Tres Pinos, California · 14769 days ago · 4 km deep · 64 km away
  12. 1.710 km S of Tres Pinos, California · 14769 days ago · 4 km deep · 64 km away
  13. 2.54 km NNE of Coalinga, California · 14769 days ago · 16 km deep · 48 km away
  14. 2.115 km NNW of Coalinga, California · 14768 days ago · 7 km deep · 36 km away
  15. 2.42 km E of San Ardo, California · 14768 days ago · 11 km deep · 60 km away
  16. 1.812 km NNW of Coalinga, California · 14768 days ago · 8 km deep · 38 km away
  17. 1.79 km NNW of Hollister, California · 14767 days ago · 2 km deep · 83 km away
  18. 2.05 km NE of Tres Pinos, California · 14767 days ago · 9 km deep · 65 km away
  19. 1.75 km SE of Tres Pinos, California · 14767 days ago · 7 km deep · 61 km away
  20. 1.84 km NW of Avenal, California · 14766 days ago · 13 km deep · 70 km away
  21. 1.93 km NNW of Avenal, California · 14766 days ago · 15 km deep · 71 km away
  22. 2.015 km NNW of Coalinga, California · 14766 days ago · 9 km deep · 35 km away
  23. 1.810 km S of Tres Pinos, California · 14766 days ago · 4 km deep · 64 km away
  24. 2.922 km NW of Parkfield, California · 14765 days ago · 4 km deep · 53 km away
  25. 1.66 km NE of Coalinga, California · 14765 days ago · 11 km deep · 49 km away
  26. 1.76 km NE of Coalinga, California · 14765 days ago · 11 km deep · 49 km away
  27. 2.716 km SSE of Tres Pinos, California · 14764 days ago · 7 km deep · 57 km away
  28. 1.515 km NE of Hollister, California · 14764 days ago · 11 km deep · 72 km away
  29. 2.24 km SE of Tres Pinos, California · 14763 days ago · 6 km deep · 62 km away
  30. 1.74 km SE of Tres Pinos, California · 14763 days ago · 6 km deep · 62 km away
  31. 2.32 km E of San Ardo, California · 14763 days ago · 12 km deep · 60 km away
  32. 3.65 km ENE of Tres Pinos, California · 14763 days ago · 8 km deep · 63 km away
  33. 2.129 km E of Tres Pinos, California · 14763 days ago · 1 km deep · 39 km away
  34. 1.75 km ENE of Tres Pinos, California · 14762 days ago · 8 km deep · 63 km away
  35. 1.75 km ENE of Tres Pinos, California · 14762 days ago · 8 km deep · 63 km away
  36. 2.45 km ENE of Tres Pinos, California · 14762 days ago · 8 km deep · 63 km away
  37. 1.67 km NE of Ridgemark, CA · 14762 days ago · 4 km deep · 69 km away
  38. 1.510 km S of Tres Pinos, California · 14762 days ago · 4 km deep · 64 km away
  39. 1.611 km NNW of Avenal, California · 14762 days ago · 7 km deep · 64 km away
  40. 1.623 km ENE of Soledad, California · 14762 days ago · 6 km deep · 38 km away
  41. 2.05 km ENE of Tres Pinos, California · 14761 days ago · 8 km deep · 63 km away
  42. 1.921 km NE of Soledad, California · 14761 days ago · 2 km deep · 46 km away
  43. 2.45 km NNE of Tres Pinos, California · 14761 days ago · 7 km deep · 66 km away
  44. 1.64 km SSW of Avenal, California · 14760 days ago · 16 km deep · 76 km away
  45. 2.46 km NE of Ridgemark, California · 14760 days ago · 4 km deep · 69 km away
  46. 2.26 km NE of Ridgemark, California · 14760 days ago · 4 km deep · 69 km away
  47. 1.84 km SE of Tres Pinos, California · 14759 days ago · 7 km deep · 62 km away
  48. 2.3Central California · 14759 days ago · 7 km deep · 67 km away
  49. 1.531 km ENE of Soledad, California · 14759 days ago · 7 km deep · 34 km away
  50. 1.713 km ENE of Gilroy, California · 14759 days ago · 18 km deep · 89 km away
  51. 1.66 km NNE of Tres Pinos, California · 14758 days ago · 3 km deep · 68 km away
  52. 2.16 km NE of Ridgemark, California · 14758 days ago · 5 km deep · 69 km away
  53. 1.75 km E of Tres Pinos, California · 14758 days ago · 8 km deep · 62 km away
  54. 1.86 km NE of Ridgemark, California · 14758 days ago · 4 km deep · 69 km away
  55. 2.025 km WSW of Coalinga, California · 14758 days ago · 2 km deep · 51 km away
  56. 1.724 km NE of Greenfield, California · 14758 days ago · 7 km deep · 37 km away
  57. 2.01 km E of San Ardo, California · 14758 days ago · 11 km deep · 60 km away
  58. 1.910 km NNW of Coalinga, California · 14756 days ago · 11 km deep · 40 km away
  59. 2.06 km NE of Ridgemark, California · 14756 days ago · 4 km deep · 70 km away
  60. 1.56 km NE of Ridgemark, California · 14756 days ago · 4 km deep · 70 km away

The first 60 of 191.

Before

  1. 1.610 km S of Tres Pinos, California · 14770 days ago · 4 km deep · 63 km away
  2. 2.220 km NW of Coalinga, California · 14770 days ago · 10 km deep · 30 km away
  3. 1.812 km SSE of Coalinga, California · 14770 days ago · 16 km deep · 63 km away
  4. 1.65 km NNE of Tres Pinos, California · 14770 days ago · 4 km deep · 66 km away
  5. 2.05 km S of Gilroy, California · 14771 days ago · 6 km deep · 95 km away
  6. 1.93 km SSE of Los Banos, California · 14771 days ago · 18 km deep · 58 km away
  7. 2.55 km SW of Gilroy, California · 14771 days ago · 6 km deep · 98 km away
  8. 1.722 km NNE of Soledad, California · 14772 days ago · 2 km deep · 50 km away
  9. 1.913 km NW of Parkfield, California · 14772 days ago · 3 km deep · 61 km away
  10. 1.530 km ENE of Soledad, California · 14772 days ago · 7 km deep · 35 km away
  11. 1.711 km NNE of Coalinga, California · 14773 days ago · 7 km deep · 45 km away
  12. 3.03 km WSW of San Juan Bautista, California · 14773 days ago · 8 km deep · 89 km away
  13. 1.917 km SSE of Tres Pinos, California · 14774 days ago · 6 km deep · 55 km away
  14. 1.99 km NNE of Coalinga, California · 14774 days ago · 7 km deep · 47 km away
  15. 1.631 km ENE of Soledad, California · 14774 days ago · 7 km deep · 34 km away
  16. 2.218 km N of Coalinga, California · 14774 days ago · 11 km deep · 34 km away
  17. 2.7Central California · 14775 days ago · 7 km deep · 35 km away
  18. 1.59 km SSE of Parkfield, California · 14775 days ago · 6 km deep · 82 km away
  19. 2.210 km NNE of Coalinga, California · 14775 days ago · 8 km deep · 47 km away
  20. 3.011 km S of Tres Pinos, California · 14775 days ago · 3 km deep · 62 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc70804. Read Mon, Sep 28, 2026, 2:22 PM UTC.