California earthquakes

M2.3 earthquake 6 km SW of Ridgemark, California

A magnitude 2.3 earthquake struck 6 km SW of Ridgemark, California on Wed, May 27, 1981, 9:08 PM PDT (04:08 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.3 4 km SW of Tres Pinos, California. This one was a foreshock.

Ridgemark 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
2.3 (md), micro
Local time
UTC
1981-05-28 04:08:18 UTC
Depth
7.8 km (4.9 mi), shallow
Epicenter
36.770° N, 121.408° 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
±0.16
Depth from
From location
Station coverage gap
35°
Stations used
66

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 157 in the 60 days after this one and 77 in the 30 days before it.

After

  1. 2.35 km SW of Ridgemark, California · 16559 days ago · 10 km deep · 1 km away
  2. 2.132 km NW of Coalinga, California · 16558 days ago · 14 km deep · 85 km away
  3. 2.121 km NE of Soledad, California · 16557 days ago · 2 km deep · 34 km away
  4. 1.624 km NE of King City, California · 16557 days ago · 5 km deep · 61 km away
  5. 1.622 km ENE of San Lucas, California · 16557 days ago · 9 km deep · 80 km away
  6. 2.338 km W of Three Rocks, California · 16556 days ago · 7 km deep · 58 km away
  7. 1.611 km ESE of East Foothills, California · 16556 days ago · 7 km deep · 68 km away
  8. 1.816 km SSE of Tres Pinos, California · 16556 days ago · 9 km deep · 18 km away
  9. 1.55 km E of Fremont, California · 16556 days ago · 8 km deep · 98 km away
  10. 1.99 km SE of Big Sur, California · 16555 days ago · 15 km deep · 70 km away
  11. 1.63 km NE of Day Valley, California · 16555 days ago · 3 km deep · 49 km away
  12. 1.95 km SE of Aromas, California · 16555 days ago · 6 km deep · 20 km away
  13. 1.823 km NE of Greenfield, California · 16555 days ago · 5 km deep · 47 km away
  14. 1.626 km NE of Soledad, California · 16554 days ago · 12 km deep · 35 km away
  15. 2.315 km SE of Livermore, California · 16553 days ago · 2 km deep · 91 km away
  16. 2.77 km WSW of Gilroy, California · 16553 days ago · 5 km deep · 31 km away
  17. 2.47 km WSW of Gilroy, California · 16553 days ago · 5 km deep · 31 km away
  18. 1.716 km SE of Livermore, California · 16553 days ago · 2 km deep · 91 km away
  19. 1.724 km ENE of Greenfield, California · 16553 days ago · 5 km deep · 51 km away
  20. 1.81 km SSE of Portola Valley, California · 16552 days ago · 6 km deep · 99 km away
  21. 2.11 km SSE of Portola Valley, California · 16552 days ago · 7 km deep · 98 km away
  22. 2.41 km SSE of Portola Valley, California · 16552 days ago · 6 km deep · 98 km away
  23. 1.79 km ESE of East Foothills, California · 16552 days ago · 7 km deep · 71 km away
  24. 2.19 km S of Sunol, California · 16552 days ago · 7 km deep · 92 km away
  25. 1.77 km WSW of Gilroy, California · 16550 days ago · 5 km deep · 31 km away
  26. 1.69 km NNE of Hollister, California · 16550 days ago · 7 km deep · 19 km away
  27. 1.922 km NE of East Foothills, California · 16549 days ago · 5 km deep · 83 km away
  28. 2.416 km ENE of Gonzales, California · 16549 days ago · 12 km deep · 25 km away
  29. 4.34 km SW of Tres Pinos, California · 16548 days ago · 10 km deep · 5 km away
  30. 2.221 km ESE of Tres Pinos, California · 16548 days ago · 5 km deep · 28 km away
  31. 2.315 km E of Seven Trees, California · 16548 days ago · 7 km deep · 62 km away
  32. 2.022 km NE of Soledad, California · 16548 days ago · 3 km deep · 36 km away
  33. 1.530 km WNW of Three Rocks, California · 16547 days ago · 4 km deep · 65 km away
  34. 1.929 km WNW of Three Rocks, California · 16547 days ago · 10 km deep · 66 km away
  35. 1.525 km NE of Soledad, California · 16546 days ago · 8 km deep · 36 km away
  36. 2.723 km NE of San Lucas, California · 16545 days ago · 10 km deep · 73 km away
  37. 2.53 km ESE of Aromas, California · 16545 days ago · 6 km deep · 21 km away
  38. 2.4Central California · 16543 days ago · 6 km deep · 12 km away
  39. 3.22 km ESE of Aromas, California · 16542 days ago · 6 km deep · 22 km away
  40. 3.02 km ESE of Aromas, California · 16542 days ago · 6 km deep · 22 km away
  41. 1.62 km ESE of Aromas, California · 16542 days ago · 5 km deep · 22 km away
  42. 1.58 km ENE of Day Valley, California · 16541 days ago · 9 km deep · 46 km away
  43. 2.13 km S of San Juan Bautista, California · 16541 days ago · 6 km deep · 13 km away
  44. 2.23 km NNW of Hollister, California · 16538 days ago · 7 km deep · 13 km away
  45. 1.910 km NE of Milpitas, California · 16538 days ago · 6 km deep · 87 km away
  46. 2.58 km ENE of Gilroy, California · 16538 days ago · 8 km deep · 31 km away
  47. 2.49 km NNW of Hollister, California · 16538 days ago · 4 km deep · 19 km away
  48. 2.39 km ESE of East Foothills, California · 16537 days ago · 2 km deep · 70 km away
  49. 2.621 km NE of Soledad, California · 16537 days ago · 7 km deep · 28 km away
  50. 2.121 km NE of Soledad, California · 16537 days ago · 7 km deep · 28 km away
  51. 2.210 km NNW of Hollister, California · 16537 days ago · 4 km deep · 19 km away
  52. 2.121 km NE of Soledad, California · 16537 days ago · 7 km deep · 28 km away
  53. 1.87 km NNE of Interlaken, California · 16537 days ago · 10 km deep · 38 km away
  54. 2.210 km NNW of Hollister, California · 16536 days ago · 4 km deep · 19 km away
  55. 1.58 km ESE of East Foothills, California · 16536 days ago · 9 km deep · 71 km away
  56. 1.89 km ESE of East Foothills, California · 16536 days ago · 8 km deep · 71 km away
  57. 1.815 km N of Morgan Hill, California · 16536 days ago · 2 km deep · 60 km away
  58. 1.65 km SW of Gilroy, California · 16535 days ago · 2 km deep · 29 km away
  59. 2.94 km N of Hollister, California · 16535 days ago · 8 km deep · 14 km away
  60. 1.69 km ESE of East Foothills, California · 16534 days ago · 0 km deep · 70 km away

The first 60 of 157.

Before

  1. 1.85 km SW of Ridgemark, California · 16559 days ago · 10 km deep · 1 km away
  2. 2.05 km SW of Ridgemark, California · 16559 days ago · 10 km deep · 1 km away
  3. 2.39 km NNW of Hollister, California · 16560 days ago · 4 km deep · 19 km away
  4. 2.45 km S of Gilroy, California · 16560 days ago · 7 km deep · 25 km away
  5. 2.46 km NE of East Foothills, California · 16560 days ago · 7 km deep · 78 km away
  6. 1.66 km ENE of East Foothills, California · 16560 days ago · 9 km deep · 76 km away
  7. 2.26 km ENE of East Foothills, California · 16560 days ago · 9 km deep · 76 km away
  8. 1.99 km ENE of Gilroy, California · 16560 days ago · 8 km deep · 29 km away
  9. 1.79 km NE of Gilroy, California · 16561 days ago · 8 km deep · 33 km away
  10. 2.78 km NNE of East Foothills, California · 16561 days ago · 7 km deep · 83 km away
  11. 1.820 km ESE of Tres Pinos, California · 16561 days ago · 6 km deep · 28 km away
  12. 2.621 km SSE of Tres Pinos, California · 16562 days ago · 6 km deep · 24 km away
  13. 1.815 km SE of Livermore, California · 16562 days ago · 2 km deep · 92 km away
  14. 1.59 km SSW of Tres Pinos, California · 16563 days ago · 3 km deep · 8 km away
  15. 1.924 km ENE of Greenfield, California · 16563 days ago · 6 km deep · 52 km away
  16. 2.55 km SW of Gilroy, California · 16563 days ago · 8 km deep · 28 km away
  17. 2.59 km NE of Gilroy, California · 16564 days ago · 9 km deep · 35 km away
  18. 1.81 km ESE of Aromas, California · 16564 days ago · 8 km deep · 23 km away
  19. 1.920 km SSW of Davenport, California · 16564 days ago · 9 km deep · 74 km away
  20. 2.12 km ESE of Aromas, California · 16565 days ago · 8 km deep · 22 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1064087. Read Mon, Sep 28, 2026, 2:16 PM UTC.