California earthquakes

M1.8 earthquake 5 km ENE of Aromas, California

A magnitude 1.8 earthquake struck 5 km ENE of Aromas, California on Sat, Feb 28, 1987, 1:18 AM PST (09:18 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.9 13 km ENE of East Foothills, 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
1.8 (md), micro
Local time
UTC
1987-02-28 09:18:06 UTC
Depth
6.7 km (4.1 mi), shallow
Epicenter
36.918° N, 121.587° 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
±0.19
Depth from
From location
Station coverage gap
32°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 169 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 3.913 km ENE of East Foothills, California · 14451 days ago · 8 km deep · 59 km away
  2. 3.113 km ENE of East Foothills, California · 14451 days ago · 7 km deep · 60 km away
  3. 1.812 km NE of East Foothills, California · 14451 days ago · 7 km deep · 62 km away
  4. 2.013 km ENE of East Foothills, California · 14451 days ago · 7 km deep · 60 km away
  5. 2.113 km ENE of East Foothills, California · 14450 days ago · 7 km deep · 59 km away
  6. 1.714 km NE of East Foothills, California · 14450 days ago · 7 km deep · 60 km away
  7. 1.713 km ENE of East Foothills, California · 14450 days ago · 8 km deep · 59 km away
  8. 1.613 km ENE of East Foothills, California · 14450 days ago · 8 km deep · 60 km away
  9. 1.614 km SSE of Livermore, California · 14450 days ago · 5 km deep · 73 km away
  10. 2.513 km ENE of East Foothills, California · 14450 days ago · 7 km deep · 57 km away
  11. 1.95 km SSW of Ridgemark, California · 14450 days ago · 7 km deep · 24 km away
  12. 1.622 km ENE of Soledad, California · 14450 days ago · 5 km deep · 63 km away
  13. 1.58 km ENE of Tres Pinos, California · 14449 days ago · 9 km deep · 34 km away
  14. 1.715 km SE of Tres Pinos, California · 14449 days ago · 11 km deep · 43 km away
  15. 1.68 km SSE of Pescadero, California · 14448 days ago · 16 km deep · 74 km away
  16. 1.518 km SSE of Livermore, California · 14448 days ago · 7 km deep · 68 km away
  17. 2.221 km NE of Soledad, California · 14448 days ago · 6 km deep · 51 km away
  18. 2.022 km NNE of Soledad, California · 14448 days ago · 4 km deep · 49 km away
  19. 1.78 km ENE of Hollister, California · 14447 days ago · 7 km deep · 24 km away
  20. 2.8Central California · 14447 days ago · 5 km deep · 22 km away
  21. 2.3Northern California · 14447 days ago · 7 km deep · 60 km away
  22. 1.718 km NE of East Foothills, California · 14447 days ago · 5 km deep · 66 km away
  23. 2.922 km NE of Soledad, California · 14446 days ago · 3 km deep · 52 km away
  24. 2.118 km NE of East Foothills, California · 14445 days ago · 6 km deep · 66 km away
  25. 1.818 km NE of East Foothills, California · 14445 days ago · 7 km deep · 66 km away
  26. 1.527 km ENE of Soledad, California · 14445 days ago · 9 km deep · 62 km away
  27. 2.115 km E of Seven Trees, California · 14444 days ago · 6 km deep · 41 km away
  28. 2.423 km NE of Soledad, California · 14444 days ago · 11 km deep · 55 km away
  29. 1.7Near the coast of Central California · 14443 days ago · 11 km deep · 42 km away
  30. 2.113 km ENE of East Foothills, California · 14442 days ago · 7 km deep · 60 km away
  31. 1.821 km NE of Soledad, California · 14440 days ago · 5 km deep · 55 km away
  32. 3.222 km NNE of Soledad, California · 14440 days ago · 6 km deep · 49 km away
  33. 1.722 km NNE of Soledad, California · 14440 days ago · 6 km deep · 49 km away
  34. 2.822 km NNE of Soledad, California · 14440 days ago · 6 km deep · 49 km away
  35. 1.722 km NNE of Soledad, California · 14440 days ago · 5 km deep · 49 km away
  36. 1.627 km NE of Soledad, California · 14440 days ago · 7 km deep · 56 km away
  37. 1.718 km NE of East Foothills, California · 14440 days ago · 7 km deep · 66 km away
  38. 1.529 km ENE of Soledad, California · 14440 days ago · 7 km deep · 61 km away
  39. 1.66 km NE of Ridgemark, California · 14440 days ago · 2 km deep · 25 km away
  40. 1.815 km SSE of Livermore, California · 14439 days ago · 4 km deep · 72 km away
  41. 1.86 km ENE of Hollister, California · 14439 days ago · 6 km deep · 23 km away
  42. 1.622 km NNE of Soledad, California · 14438 days ago · 6 km deep · 49 km away
  43. 1.96 km NE of Tres Pinos, California · 14438 days ago · 8 km deep · 30 km away
  44. 1.79 km SSW of Tres Pinos, California · 14438 days ago · 3 km deep · 32 km away
  45. 1.69 km SE of Sunol, California · 14437 days ago · 10 km deep · 71 km away
  46. 1.912 km S of Tres Pinos, California · 14437 days ago · 5 km deep · 37 km away
  47. 1.623 km ENE of Soledad, California · 14436 days ago · 3 km deep · 63 km away
  48. 1.918 km NE of East Foothills, California · 14436 days ago · 5 km deep · 66 km away
  49. 2.028 km NE of Soledad, California · 14436 days ago · 5 km deep · 58 km away
  50. 1.821 km NE of Soledad, California · 14436 days ago · 3 km deep · 51 km away
  51. 2.020 km ENE of East Foothills, California · 14435 days ago · 7 km deep · 62 km away
  52. 1.59 km NNE of Hollister, California · 14435 days ago · 7 km deep · 21 km away
  53. 2.311 km S of Tres Pinos, California · 14435 days ago · 4 km deep · 36 km away
  54. 1.812 km S of Tres Pinos, California · 14434 days ago · 4 km deep · 36 km away
  55. 1.618 km SSE of Livermore, California · 14434 days ago · 4 km deep · 69 km away
  56. 1.66 km NE of Ridgemark, California · 14434 days ago · 4 km deep · 25 km away
  57. 1.716 km SSE of Tres Pinos, California · 14434 days ago · 9 km deep · 41 km away
  58. 1.524 km NE of Greenfield, California · 14434 days ago · 7 km deep · 72 km away
  59. 2.420 km SSE of Tres Pinos, California · 14433 days ago · 5 km deep · 46 km away
  60. 2.522 km NE of Soledad, California · 14433 days ago · 5 km deep · 52 km away

The first 60 of 169.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc95821. Read Tue, Sep 22, 2026, 9:59 AM UTC.