California earthquakes

M1.5 earthquake 4 km N of Aromas, California

A magnitude 1.5 earthquake struck 4 km N of Aromas, California on Wed, Sep 27, 1978, 8:34 PM PDT (03:34 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.8 18 km SSE of Tres Pinos, California. This one was a foreshock.

Aromas 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
1.5 (md), micro
Local time
UTC
1978-09-28 03:34:48 UTC
Depth
3.9 km (2.4 mi), shallow
Epicenter
36.930° N, 121.649° 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, 0.4 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
51°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 126 in the 60 days after this one and 96 in the 30 days before it.

After

  1. 1.64 km NE of Day Valley, California · 17531 days ago · 12 km deep · 21 km away
  2. 2.016 km E of Seven Trees, California · 17531 days ago · 7 km deep · 41 km away
  3. 1.78 km SSW of Tres Pinos, California · 17530 days ago · 2 km deep · 35 km away
  4. 1.56 km WSW of Gilroy, California · 17530 days ago · 4 km deep · 6 km away
  5. 2.48 km ESE of East Foothills, California · 17530 days ago · 1 km deep · 48 km away
  6. 1.521 km NE of Soledad, California · 17530 days ago · 7 km deep · 58 km away
  7. 2.88 km E of Gilroy, California · 17529 days ago · 4 km deep · 17 km away
  8. 1.76 km WSW of Gilroy, California · 17529 days ago · 7 km deep · 7 km away
  9. 1.814 km SSE of Tres Pinos, California · 17528 days ago · 4 km deep · 44 km away
  10. 2.422 km ENE of Soledad, California · 17527 days ago · 3 km deep · 64 km away
  11. 1.622 km ENE of Soledad, California · 17527 days ago · 2 km deep · 64 km away
  12. 2.522 km NE of Soledad, California · 17527 days ago · 3 km deep · 64 km away
  13. 2.122 km NE of Soledad, California · 17526 days ago · 2 km deep · 64 km away
  14. 3.113 km SSE of Tres Pinos, California · 17526 days ago · 5 km deep · 43 km away
  15. 1.711 km S of Tres Pinos, California · 17525 days ago · 4 km deep · 40 km away
  16. 1.913 km S of Tres Pinos, California · 17524 days ago · 4 km deep · 43 km away
  17. 1.88 km SSW of Tres Pinos, California · 17523 days ago · 2 km deep · 34 km away
  18. 1.729 km SW of South Dos Palos, California · 17523 days ago · 5 km deep · 73 km away
  19. 3.021 km NE of Soledad, California · 17522 days ago · 3 km deep · 59 km away
  20. 1.821 km NE of Soledad, California · 17522 days ago · 3 km deep · 59 km away
  21. 3.39 km S of Tres Pinos, California · 17521 days ago · 4 km deep · 38 km away
  22. 1.99 km S of Tres Pinos, California · 17521 days ago · 4 km deep · 37 km away
  23. 1.99 km S of Tres Pinos, California · 17521 days ago · 4 km deep · 38 km away
  24. 2.010 km S of Tres Pinos, California · 17521 days ago · 4 km deep · 38 km away
  25. 2.210 km S of Tres Pinos, California · 17521 days ago · 5 km deep · 39 km away
  26. 3.818 km SSE of Tres Pinos, California · 17521 days ago · 8 km deep · 49 km away
  27. 1.518 km SSE of Tres Pinos, California · 17521 days ago · 6 km deep · 48 km away
  28. 3.224 km E of Tres Pinos, California · 17521 days ago · 1 km deep · 56 km away
  29. 2.922 km E of Tres Pinos, California · 17521 days ago · 5 km deep · 54 km away
  30. 1.77 km WSW of Gilroy, California · 17520 days ago · 4 km deep · 7 km away
  31. 1.67 km NE of East Foothills, California · 17520 days ago · 11 km deep · 57 km away
  32. 2.622 km SSE of Tres Pinos, California · 17519 days ago · 6 km deep · 52 km away
  33. 1.912 km E of Seven Trees, California · 17519 days ago · 1 km deep · 40 km away
  34. 1.918 km SSE of Tres Pinos, California · 17519 days ago · 6 km deep · 49 km away
  35. 1.923 km ENE of Soledad, California · 17517 days ago · 2 km deep · 70 km away
  36. 1.613 km SSE of Tres Pinos, California · 17517 days ago · 3 km deep · 44 km away
  37. 3.29 km NNW of Hollister, California · 17516 days ago · 8 km deep · 17 km away
  38. 1.68 km NNW of Hollister, California · 17516 days ago · 5 km deep · 19 km away
  39. 2.221 km SSE of Tres Pinos, California · 17516 days ago · 5 km deep · 52 km away
  40. 2.93 km E of Morgan Hill, California · 17515 days ago · 2 km deep · 23 km away
  41. 1.617 km SSE of Tres Pinos, California · 17514 days ago · 6 km deep · 48 km away
  42. 2.223 km NE of Greenfield, California · 17514 days ago · 6 km deep · 74 km away
  43. 2.910 km S of Tres Pinos, California · 17512 days ago · 4 km deep · 38 km away
  44. 1.510 km S of Tres Pinos, California · 17512 days ago · 4 km deep · 38 km away
  45. 1.917 km SSE of Tres Pinos, California · 17512 days ago · 6 km deep · 48 km away
  46. 1.88 km SSW of Tres Pinos, California · 17511 days ago · 2 km deep · 36 km away
  47. 1.75 km NE of East Foothills, California · 17510 days ago · 6 km deep · 55 km away
  48. 2.00 km WSW of Lexington Hills, California · 17510 days ago · 10 km deep · 39 km away
  49. 1.87 km S of Sunol, California · 17509 days ago · 8 km deep · 70 km away
  50. 2.530 km ENE of Soledad, California · 17509 days ago · 7 km deep · 69 km away
  51. 1.96 km ENE of East Foothills, California · 17509 days ago · 8 km deep · 53 km away
  52. 1.59 km S of Tres Pinos, California · 17508 days ago · 4 km deep · 37 km away
  53. 1.721 km NE of Soledad, California · 17506 days ago · 2 km deep · 57 km away
  54. 2.616 km S of Davenport, California · 17506 days ago · 5 km deep · 46 km away
  55. 2.517 km S of Davenport, California · 17506 days ago · 4 km deep · 46 km away
  56. 1.616 km E of Tres Pinos, California · 17504 days ago · 0 km deep · 49 km away
  57. 2.424 km ENE of Greenfield, California · 17504 days ago · 10 km deep · 82 km away
  58. 3.114 km N of Morgan Hill, California · 17503 days ago · 5 km deep · 36 km away
  59. 1.97 km SE of San Juan Bautista, California · 17503 days ago · 4 km deep · 21 km away
  60. 1.813 km SE of Tres Pinos, California · 17503 days ago · 14 km deep · 47 km away

The first 60 of 126.

Before

  1. 2.93 km ENE of East Foothills, California · 17534 days ago · 1 km deep · 53 km away
  2. 1.510 km S of Tres Pinos, California · 17535 days ago · 4 km deep · 39 km away
  3. 1.59 km NNW of Hollister, California · 17535 days ago · 5 km deep · 19 km away
  4. 1.9Central California · 17535 days ago · 4 km deep · 37 km away
  5. 1.63 km W of Hollister, California · 17535 days ago · 4 km deep · 21 km away
  6. 1.99 km NNW of Hollister, California · 17535 days ago · 5 km deep · 19 km away
  7. 1.99 km S of Tres Pinos, California · 17535 days ago · 4 km deep · 38 km away
  8. 1.99 km S of Tres Pinos, California · 17535 days ago · 4 km deep · 38 km away
  9. 2.021 km NE of Soledad, California · 17537 days ago · 3 km deep · 60 km away
  10. 2.510 km S of Tres Pinos, California · 17537 days ago · 4 km deep · 38 km away
  11. 1.623 km NNE of San Lucas, California · 17537 days ago · 6 km deep · 96 km away
  12. 1.59 km S of Tres Pinos, California · 17537 days ago · 4 km deep · 38 km away
  13. 2.99 km S of Tres Pinos, California · 17537 days ago · 4 km deep · 38 km away
  14. 1.78 km NNW of Hollister, California · 17537 days ago · 4 km deep · 19 km away
  15. 2.29 km NNW of Hollister, California · 17537 days ago · 6 km deep · 19 km away
  16. 1.522 km ENE of Soledad, California · 17538 days ago · 5 km deep · 69 km away
  17. 2.89 km NNW of Hollister, California · 17538 days ago · 6 km deep · 19 km away
  18. 1.89 km NW of Hollister, California · 17539 days ago · 4 km deep · 16 km away
  19. 1.88 km NE of Interlaken, California · 17540 days ago · 4 km deep · 8 km away
  20. 1.69 km SSE of Tres Pinos, California · 17540 days ago · 5 km deep · 40 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1042525. Read Mon, Sep 28, 2026, 11:09 PM UTC.