California earthquakes

M1.7 earthquake 37 km W of Three Rocks, California

A magnitude 1.7 earthquake struck 37 km W of Three Rocks, California on Sun, Dec 20, 1981, 1:32 AM PST (09:32 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M1.9 25 km NE 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
1.7 (md), micro
Local time
UTC
1981-12-20 09:32:47 UTC
Depth
5.2 km (3.2 mi), shallow
Epicenter
36.554° N, 120.802° 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, 1.9 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
203°, poorly surrounded by stations
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 141 in the 60 days after this one and 43 in the 30 days before it.

After

  1. 1.925 km NE of Soledad, California · 16347 days ago · 9 km deep · 29 km away
  2. 1.825 km NE of Soledad, California · 16347 days ago · 9 km deep · 29 km away
  3. 1.523 km ENE of Soledad, California · 16347 days ago · 2 km deep · 25 km away
  4. 1.77 km NE of Aromas, California · 16346 days ago · 6 km deep · 81 km away
  5. 1.84 km SE of Tres Pinos, California · 16346 days ago · 7 km deep · 49 km away
  6. 1.8Central California · 16346 days ago · 3 km deep · 88 km away
  7. 1.64 km ESE of Aromas, California · 16345 days ago · 7 km deep · 79 km away
  8. 2.021 km NE of Soledad, California · 16345 days ago · 8 km deep · 34 km away
  9. 1.72 km ESE of Aromas, California · 16345 days ago · 8 km deep · 81 km away
  10. 1.827 km W of Lockwood, California · 16344 days ago · 11 km deep · 87 km away
  11. 1.524 km NE of Greenfield, California · 16344 days ago · 7 km deep · 24 km away
  12. 2.09 km NNE of Interlaken, California · 16344 days ago · 7 km deep · 95 km away
  13. 1.931 km W of Three Rocks, California · 16343 days ago · 13 km deep · 5 km away
  14. 2.51 km E of Tres Pinos, California · 16343 days ago · 7 km deep · 52 km away
  15. 1.725 km SSW of South Dos Palos, California · 16343 days ago · 2 km deep · 23 km away
  16. 1.524 km SSW of South Dos Palos, California · 16343 days ago · 0 km deep · 24 km away
  17. 1.812 km W of Three Rocks, California · 16342 days ago · 10 km deep · 26 km away
  18. 1.825 km ENE of Greenfield, California · 16342 days ago · 6 km deep · 22 km away
  19. 2.024 km NE of San Lucas, California · 16341 days ago · 6 km deep · 32 km away
  20. 1.85 km SW of Gilroy, California · 16341 days ago · 3 km deep · 85 km away
  21. 1.521 km NE of Soledad, California · 16341 days ago · 8 km deep · 30 km away
  22. 1.610 km SE of San Juan Bautista, California · 16341 days ago · 7 km deep · 64 km away
  23. 1.514 km SW of Coalinga, California · 16340 days ago · 6 km deep · 61 km away
  24. 1.68 km NNE of Interlaken, California · 16340 days ago · 10 km deep · 94 km away
  25. 1.612 km ENE of Hollister, California · 16340 days ago · 4 km deep · 58 km away
  26. 1.610 km SSE of Three Rocks, California · 16340 days ago · 5 km deep · 43 km away
  27. 2.19 km NW of Hollister, California · 16340 days ago · 7 km deep · 71 km away
  28. 1.621 km NE of Soledad, California · 16340 days ago · 3 km deep · 32 km away
  29. 1.833 km SE of Tres Pinos, California · 16339 days ago · 7 km deep · 21 km away
  30. 2.024 km NE of King City, California · 16338 days ago · 0 km deep · 23 km away
  31. 1.525 km SE of Tres Pinos, California · 16337 days ago · 6 km deep · 29 km away
  32. 2.128 km NE of Greenfield, California · 16337 days ago · 9 km deep · 20 km away
  33. 2.55 km SSE of Lemoore, California · 16336 days ago · 12 km deep · 98 km away
  34. 1.724 km ENE of San Lucas, California · 16335 days ago · 5 km deep · 37 km away
  35. 1.625 km ENE of Greenfield, California · 16335 days ago · 5 km deep · 23 km away
  36. 1.89 km SSW of Ridgemark, California · 16334 days ago · 8 km deep · 58 km away
  37. 1.524 km ENE of Greenfield, California · 16333 days ago · 5 km deep · 23 km away
  38. 3.128 km SE of Tres Pinos, California · 16332 days ago · 11 km deep · 25 km away
  39. 2.22 km SSW of Hollister, California · 16332 days ago · 8 km deep · 62 km away
  40. 1.79 km NE of San Martin, California · 16330 days ago · 6 km deep · 94 km away
  41. 1.911 km NNW of Huron, California · 16330 days ago · 18 km deep · 63 km away
  42. 1.921 km WSW of Three Rocks, California · 16330 days ago · 11 km deep · 20 km away
  43. 2.123 km NE of Greenfield, California · 16328 days ago · 6 km deep · 24 km away
  44. 1.929 km SE of Tres Pinos, California · 16328 days ago · 10 km deep · 25 km away
  45. 1.816 km SSE of Tres Pinos, California · 16326 days ago · 2 km deep · 43 km away
  46. 2.122 km NNE of Soledad, California · 16326 days ago · 5 km deep · 37 km away
  47. 1.611 km S of Tres Pinos, California · 16326 days ago · 4 km deep · 48 km away
  48. 2.69 km S of South Dos Palos, California · 16325 days ago · -1 km deep · 39 km away
  49. 2.510 km S of South Dos Palos, California · 16325 days ago · 3 km deep · 39 km away
  50. 2.411 km S of Tres Pinos, California · 16325 days ago · 4 km deep · 47 km away
  51. 2.713 km SSE of Tres Pinos, California · 16325 days ago · 3 km deep · 45 km away
  52. 2.723 km ENE of Soledad, California · 16325 days ago · 5 km deep · 27 km away
  53. 2.39 km NE of Gilroy, California · 16325 days ago · 9 km deep · 83 km away
  54. 2.611 km S of Tres Pinos, California · 16324 days ago · 4 km deep · 47 km away
  55. 1.920 km SSE of Tres Pinos, California · 16324 days ago · 4 km deep · 39 km away
  56. 1.624 km ENE of Soledad, California · 16323 days ago · 2 km deep · 25 km away
  57. 2.017 km SSW of South Dos Palos, California · 16323 days ago · 3 km deep · 31 km away
  58. 2.910 km S of Tres Pinos, California · 16322 days ago · 4 km deep · 49 km away
  59. 1.716 km SSE of Tres Pinos, California · 16321 days ago · 3 km deep · 43 km away
  60. 2.124 km NE of San Lucas, California · 16320 days ago · 4 km deep · 28 km away

The first 60 of 141.

Before

  1. 1.624 km ENE of Greenfield, California · 16347 days ago · 1 km deep · 23 km away
  2. 2.324 km NE of Greenfield, California · 16348 days ago · 4 km deep · 24 km away
  3. 1.914 km WSW of Three Rocks, California · 16348 days ago · 14 km deep · 24 km away
  4. 1.938 km W of Three Rocks, California · 16349 days ago · 5 km deep · 2 km away
  5. 2.037 km W of Three Rocks, California · 16349 days ago · 7 km deep · 2 km away
  6. 1.737 km W of Lockwood, California · 16349 days ago · 14 km deep · 90 km away
  7. 1.629 km ENE of Soledad, California · 16349 days ago · 5 km deep · 22 km away
  8. 2.523 km ENE of Soledad, California · 16350 days ago · 5 km deep · 25 km away
  9. 2.538 km W of Three Rocks, California · 16350 days ago · 6 km deep · 2 km away
  10. 1.524 km ENE of Greenfield, California · 16350 days ago · 5 km deep · 23 km away
  11. 1.537 km W of Three Rocks, California · 16350 days ago · -1 km deep · 1 km away
  12. 2.738 km W of Three Rocks, California · 16351 days ago · 5 km deep · 2 km away
  13. 1.725 km ENE of Greenfield, California · 16351 days ago · 1 km deep · 22 km away
  14. 2.638 km W of Three Rocks, California · 16351 days ago · 6 km deep · 2 km away
  15. 1.632 km W of Three Rocks, California · 16351 days ago · 28 km deep · 6 km away
  16. 1.88 km ENE of Morgan Hill, California · 16351 days ago · 4 km deep · 96 km away
  17. 3.038 km W of Three Rocks, California · 16351 days ago · 7 km deep · 2 km away
  18. 1.638 km W of Three Rocks, California · 16351 days ago · 6 km deep · 2 km away
  19. 2.038 km W of Three Rocks, California · 16351 days ago · 7 km deep · 2 km away
  20. 1.65 km SSW of Ridgemark, California · 16351 days ago · 5 km deep · 56 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1070470. Read Tue, Sep 22, 2026, 3:15 PM UTC.