California earthquakes

M2.1 earthquake 2 km ESE of Aromas, California

A magnitude 2.1 earthquake struck 2 km ESE of Aromas, California on Wed, Dec 28, 1988, 7:16 AM PST (15:16 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.3 15 km E of Seven Trees, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1988-12-28 15:16:31 UTC
Depth
6.9 km (4.3 mi), shallow
Epicenter
36.881° N, 121.613° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
54°
Stations used
49

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 114 in the 60 days after this one and 74 in the 30 days before it.

After

  1. 2.310 km ESE of East Foothills, California · 13791 days ago · 8 km deep · 52 km away
  2. 1.940 km SE of Big Sur, California · 13791 days ago · 3 km deep · 100 km away
  3. 1.815 km E of Seven Trees, California · 13790 days ago · 7 km deep · 45 km away
  4. 4.315 km E of Seven Trees, California · 13790 days ago · 7 km deep · 45 km away
  5. 2.223 km NE of Soledad, California · 13787 days ago · 2 km deep · 53 km away
  6. 1.58 km ESE of East Foothills, California · 13787 days ago · 7 km deep · 54 km away
  7. 2.39 km S of Tres Pinos, California · 13785 days ago · 3 km deep · 31 km away
  8. 2.222 km NE of Soledad, California · 13785 days ago · 2 km deep · 54 km away
  9. 2.06 km NE of East Foothills, California · 13785 days ago · 8 km deep · 62 km away
  10. 1.624 km NE of Greenfield, California · 13784 days ago · 5 km deep · 67 km away
  11. 1.69 km SSW of Ridgemark, California · 13784 days ago · 7 km deep · 23 km away
  12. 1.73 km ESE of Tres Pinos, California · 13784 days ago · 9 km deep · 31 km away
  13. 2.510 km ESE of Gilroy, California · 13783 days ago · 5 km deep · 17 km away
  14. 1.814 km SW of South Dos Palos, California · 13782 days ago · 4 km deep · 75 km away
  15. 1.615 km SSE of Livermore, California · 13782 days ago · 8 km deep · 76 km away
  16. 2.518 km NE of East Foothills, California · 13781 days ago · 9 km deep · 71 km away
  17. 1.624 km ENE of Greenfield, CA · 13780 days ago · 5 km deep · 73 km away
  18. 1.515 km N of Morgan Hill, California · 13779 days ago · 6 km deep · 44 km away
  19. 2.025 km SE of Tres Pinos, California · 13779 days ago · 11 km deep · 53 km away
  20. 1.625 km W of Volta, California · 13777 days ago · 0 km deep · 42 km away
  21. 2.48 km NNE of East Foothills, California · 13777 days ago · 7 km deep · 65 km away
  22. 1.924 km NE of Greenfield, California · 13776 days ago · 5 km deep · 69 km away
  23. 1.67 km E of East Foothills, California · 13776 days ago · 7 km deep · 57 km away
  24. 1.87 km ENE of Hollister, California · 13776 days ago · 4 km deep · 25 km away
  25. 2.410 km NNE of East Foothills, California · 13776 days ago · 7 km deep · 68 km away
  26. 1.55 km SE of Tres Pinos, California · 13776 days ago · 7 km deep · 33 km away
  27. 3.26 km ENE of East Foothills, California · 13775 days ago · 8 km deep · 61 km away
  28. 1.84 km ESE of Tres Pinos, California · 13774 days ago · 8 km deep · 32 km away
  29. 1.721 km NE of Soledad, California · 13774 days ago · 8 km deep · 57 km away
  30. 1.66 km WSW of Gilroy, California · 13774 days ago · 5 km deep · 11 km away
  31. 1.87 km E of East Foothills, California · 13773 days ago · 7 km deep · 57 km away
  32. 2.411 km ESE of Gilroy, California · 13773 days ago · 5 km deep · 17 km away
  33. 1.611 km ESE of Gilroy, California · 13773 days ago · 5 km deep · 17 km away
  34. 1.912 km S of Tres Pinos, California · 13773 days ago · 4 km deep · 36 km away
  35. 2.516 km SSE of Livermore, California · 13772 days ago · 3 km deep · 75 km away
  36. 1.924 km SE of Tres Pinos, California · 13772 days ago · 11 km deep · 52 km away
  37. 2.622 km NNE of Soledad, California · 13771 days ago · 2 km deep · 47 km away
  38. 1.817 km SSE of Tres Pinos, California · 13770 days ago · 6 km deep · 43 km away
  39. 1.98 km NNE of East Foothills, California · 13770 days ago · 9 km deep · 65 km away
  40. 1.918 km NE of East Foothills, California · 13769 days ago · 6 km deep · 70 km away
  41. 1.76 km NNE of East Foothills, California · 13769 days ago · 6 km deep · 64 km away
  42. 2.125 km NE of Greenfield, California · 13768 days ago · 8 km deep · 70 km away
  43. 1.812 km S of Tres Pinos, California · 13768 days ago · 4 km deep · 36 km away
  44. 2.215 km SSE of Livermore, California · 13767 days ago · 7 km deep · 76 km away
  45. 1.923 km ENE of Soledad, California · 13767 days ago · 4 km deep · 62 km away
  46. 1.623 km ENE of Soledad, California · 13767 days ago · 4 km deep · 62 km away
  47. 1.515 km SSE of Livermore, California · 13766 days ago · 6 km deep · 76 km away
  48. 1.57 km NE of Ridgemark, California · 13766 days ago · 5 km deep · 27 km away
  49. 1.525 km ENE of Greenfield, California · 13765 days ago · 2 km deep · 72 km away
  50. 1.82 km NE of Union City, California · 13765 days ago · 7 km deep · 88 km away
  51. 2.021 km NE of Soledad, California · 13765 days ago · 6 km deep · 54 km away
  52. 1.722 km SSW of Los Banos, California · 13763 days ago · 0 km deep · 58 km away
  53. 1.624 km NE of Greenfield, California · 13763 days ago · 2 km deep · 70 km away
  54. 1.522 km NE of San Lucas, California · 13763 days ago · 6 km deep · 94 km away
  55. 2.620 km WSW of Volta, California · 13762 days ago · 6 km deep · 46 km away
  56. 2.620 km WSW of Volta, California · 13762 days ago · 5 km deep · 46 km away
  57. 2.119 km WSW of Volta, California · 13762 days ago · 6 km deep · 46 km away
  58. 1.523 km SE of Tres Pinos, California · 13761 days ago · 7 km deep · 49 km away
  59. 1.89 km SSW of Tres Pinos, California · 13760 days ago · 3 km deep · 31 km away
  60. 1.926 km NE of Soledad, California · 13760 days ago · 9 km deep · 57 km away

The first 60 of 114.

Before

  1. 2.06 km SSE of Tres Pinos, California · 13792 days ago · 7 km deep · 33 km away
  2. 1.98 km NE of Gilroy, California · 13793 days ago · 4 km deep · 22 km away
  3. 1.64 km WSW of Boronda, California · 13794 days ago · 4 km deep · 24 km away
  4. 1.624 km NE of Soledad, California · 13795 days ago · 7 km deep · 54 km away
  5. 1.524 km NE of Greenfield, California · 13795 days ago · 4 km deep · 72 km away
  6. 1.510 km S of Tres Pinos, California · 13795 days ago · 4 km deep · 32 km away
  7. 2.08 km SSE of San Juan Bautista, California · 13797 days ago · 7 km deep · 16 km away
  8. 2.88 km NE of Ridgemark, California · 13797 days ago · 5 km deep · 27 km away
  9. 1.69 km ESE of East Foothills, California · 13798 days ago · 7 km deep · 53 km away
  10. 2.515 km SSE of Livermore, California · 13798 days ago · 8 km deep · 76 km away
  11. 1.89 km SE of Sunol, California · 13798 days ago · 4 km deep · 74 km away
  12. 2.117 km SSE of Tres Pinos, California · 13799 days ago · 6 km deep · 43 km away
  13. 2.417 km SSE of Tres Pinos, California · 13799 days ago · 6 km deep · 43 km away
  14. 1.92 km SSW of Hollister, California · 13799 days ago · 9 km deep · 19 km away
  15. 1.817 km SSE of Tres Pinos, California · 13799 days ago · 6 km deep · 43 km away
  16. 1.935 km NE of King City, California · 13800 days ago · 12 km deep · 82 km away
  17. 1.78 km ENE of San Martin, California · 13800 days ago · 7 km deep · 28 km away
  18. 1.821 km NE of Soledad, California · 13801 days ago · 6 km deep · 54 km away
  19. 2.417 km SSE of Tres Pinos, California · 13801 days ago · 4 km deep · 41 km away
  20. 2.69 km NNE of East Foothills, California · 13802 days ago · 8 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc129308. Read Fri, Oct 2, 2026, 10:25 PM UTC.