California earthquakes

M1.8 earthquake 1 km ESE of Aromas, California

A magnitude 1.8 earthquake struck 1 km ESE of Aromas, California on Sat, May 23, 1981, 9:22 AM PDT (16:22 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M2.5 9 km NE of Gilroy, 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
1.8 (md), micro
Local time
UTC
1981-05-23 16:22:35 UTC
Depth
8.3 km (5.2 mi), shallow
Epicenter
36.884° N, 121.624° 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
±0.13
Depth from
From location
Station coverage gap
54°
Stations used
48

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 161 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.59 km NE of Gilroy, California · 16558 days ago · 9 km deep · 24 km away
  2. 2.55 km SW of Gilroy, California · 16558 days ago · 8 km deep · 10 km away
  3. 1.924 km ENE of Greenfield, California · 16558 days ago · 6 km deep · 75 km away
  4. 1.59 km SSW of Tres Pinos, California · 16557 days ago · 3 km deep · 31 km away
  5. 1.83 km E of Union City, California · 16557 days ago · 7 km deep · 85 km away
  6. 1.815 km SE of Livermore, California · 16556 days ago · 2 km deep · 76 km away
  7. 2.621 km SSE of Tres Pinos, California · 16556 days ago · 6 km deep · 47 km away
  8. 1.820 km ESE of Tres Pinos, California · 16555 days ago · 6 km deep · 50 km away
  9. 2.78 km NNE of East Foothills, California · 16555 days ago · 7 km deep · 65 km away
  10. 1.79 km NE of Gilroy, California · 16555 days ago · 8 km deep · 23 km away
  11. 1.99 km ENE of Gilroy, California · 16554 days ago · 8 km deep · 21 km away
  12. 2.26 km ENE of East Foothills, California · 16554 days ago · 9 km deep · 58 km away
  13. 1.66 km ENE of East Foothills, California · 16554 days ago · 9 km deep · 58 km away
  14. 2.46 km NE of East Foothills, California · 16554 days ago · 7 km deep · 60 km away
  15. 2.45 km S of Gilroy, California · 16554 days ago · 7 km deep · 9 km away
  16. 2.39 km NNW of Hollister, California · 16554 days ago · 4 km deep · 18 km away
  17. 2.05 km SW of Ridgemark, California · 16554 days ago · 10 km deep · 22 km away
  18. 1.85 km SW of Ridgemark, California · 16554 days ago · 10 km deep · 23 km away
  19. 2.36 km SW of Ridgemark, California · 16554 days ago · 8 km deep · 23 km away
  20. 2.35 km SW of Ridgemark, California · 16554 days ago · 10 km deep · 23 km away
  21. 2.121 km NE of Soledad, California · 16551 days ago · 2 km deep · 57 km away
  22. 1.624 km NE of King City, California · 16551 days ago · 5 km deep · 84 km away
  23. 2.338 km W of Three Rocks, California · 16551 days ago · 7 km deep · 81 km away
  24. 1.611 km ESE of East Foothills, California · 16551 days ago · 7 km deep · 51 km away
  25. 1.816 km SSE of Tres Pinos, California · 16551 days ago · 9 km deep · 41 km away
  26. 1.55 km E of Fremont, California · 16550 days ago · 8 km deep · 78 km away
  27. 1.99 km SE of Big Sur, California · 16549 days ago · 15 km deep · 77 km away
  28. 1.63 km NE of Day Valley, California · 16549 days ago · 3 km deep · 27 km away
  29. 1.95 km SE of Aromas, California · 16549 days ago · 6 km deep · 3 km away
  30. 1.823 km NE of Greenfield, California · 16549 days ago · 5 km deep · 70 km away
  31. 1.64 km SSE of Fairview, California · 16549 days ago · 3 km deep · 92 km away
  32. 1.626 km NE of Soledad, California · 16548 days ago · 12 km deep · 58 km away
  33. 2.315 km SE of Livermore, California · 16547 days ago · 2 km deep · 76 km away
  34. 2.77 km WSW of Gilroy, California · 16547 days ago · 5 km deep · 10 km away
  35. 2.47 km WSW of Gilroy, California · 16547 days ago · 5 km deep · 10 km away
  36. 1.716 km SE of Livermore, California · 16547 days ago · 2 km deep · 76 km away
  37. 1.724 km ENE of Greenfield, California · 16547 days ago · 5 km deep · 74 km away
  38. 1.81 km SSE of Portola Valley, California · 16547 days ago · 6 km deep · 76 km away
  39. 2.11 km SSE of Portola Valley, California · 16547 days ago · 7 km deep · 76 km away
  40. 2.41 km SSE of Portola Valley, California · 16546 days ago · 6 km deep · 76 km away
  41. 1.79 km ESE of East Foothills, California · 16546 days ago · 7 km deep · 53 km away
  42. 2.19 km S of Sunol, California · 16546 days ago · 7 km deep · 73 km away
  43. 1.77 km WSW of Gilroy, California · 16545 days ago · 5 km deep · 10 km away
  44. 1.69 km NNE of Hollister, California · 16544 days ago · 7 km deep · 23 km away
  45. 1.922 km NE of East Foothills, California · 16544 days ago · 5 km deep · 68 km away
  46. 2.416 km ENE of Gonzales, California · 16543 days ago · 12 km deep · 47 km away
  47. 4.34 km SW of Tres Pinos, California · 16543 days ago · 10 km deep · 28 km away
  48. 2.221 km ESE of Tres Pinos, California · 16543 days ago · 5 km deep · 51 km away
  49. 1.60 km NE of Woodside, California · 16542 days ago · 5 km deep · 82 km away
  50. 2.315 km E of Seven Trees, California · 16542 days ago · 7 km deep · 46 km away
  51. 2.022 km NE of Soledad, California · 16542 days ago · 3 km deep · 59 km away
  52. 1.530 km WNW of Three Rocks, California · 16541 days ago · 4 km deep · 87 km away
  53. 1.929 km WNW of Three Rocks, California · 16541 days ago · 10 km deep · 88 km away
  54. 1.56 km N of Foster City, California · 16540 days ago · 14 km deep · 99 km away
  55. 1.525 km NE of Soledad, California · 16540 days ago · 8 km deep · 59 km away
  56. 2.723 km NE of San Lucas, California · 16540 days ago · 10 km deep · 96 km away
  57. 2.53 km ESE of Aromas, California · 16539 days ago · 6 km deep · 2 km away
  58. 1.58 km ENE of Dublin, California · 16538 days ago · 11 km deep · 97 km away
  59. 2.4Central California · 16537 days ago · 6 km deep · 12 km away
  60. 1.6Northern California · 16537 days ago · 4 km deep · 91 km away

The first 60 of 161.

Before

  1. 1.920 km SSW of Davenport, California · 16558 days ago · 9 km deep · 55 km away
  2. 2.12 km ESE of Aromas, California · 16559 days ago · 8 km deep · 1 km away
  3. 2.031 km WNW of Three Rocks, California · 16559 days ago · 10 km deep · 87 km away
  4. 1.81 km NW of Emerald Lake Hills, California · 16560 days ago · 3 km deep · 88 km away
  5. 1.624 km NE of Greenfield, California · 16561 days ago · 3 km deep · 69 km away
  6. 2.916 km SW of Volta, California · 16561 days ago · 3 km deep · 52 km away
  7. 1.916 km SW of Volta, California · 16561 days ago · 6 km deep · 52 km away
  8. 1.516 km SW of Volta, California · 16561 days ago · 7 km deep · 52 km away
  9. 3.916 km SW of Volta, California · 16561 days ago · 4 km deep · 52 km away
  10. 2.011 km ESE of Gilroy, California · 16561 days ago · 5 km deep · 18 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1063933. Read Tue, Sep 22, 2026, 7:50 PM UTC.