California earthquakes

M1.5 earthquake 8 km SSW of Ridgemark, California

A magnitude 1.5 earthquake struck 8 km SSW of Ridgemark, California on Sat, Jul 25, 1981, 5:01 PM PDT (00:01 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.2 2 km ESE 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.

Open the live map with earthquakes

The earthquake

Magnitude
1.5 (md), micro
Local time
UTC
1981-07-26 00:01:23 UTC
Depth
6.2 km (3.8 mi), shallow
Epicenter
36.738° N, 121.405° 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, 0.3 km in depth
Magnitude uncertainty
±0.26
Depth from
From location
Station coverage gap
74°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 172 in the 60 days after this one and 85 in the 30 days before it.

After

  1. 2.04 km SE of Alum Rock, California · 16499 days ago · 3 km deep · 75 km away
  2. 1.716 km S of Davenport, California · 16499 days ago · 4 km deep · 71 km away
  3. 1.77 km ESE of East Foothills, California · 16499 days ago · 1 km deep · 75 km away
  4. 1.615 km N of Morgan Hill, California · 16499 days ago · 2 km deep · 63 km away
  5. 1.811 km S of Tres Pinos, California · 16499 days ago · 4 km deep · 9 km away
  6. 2.12 km ESE of Aromas, California · 16498 days ago · 7 km deep · 25 km away
  7. 1.63 km ESE of Aromas, California · 16498 days ago · 7 km deep · 24 km away
  8. 2.121 km NE of Soledad, California · 16498 days ago · 6 km deep · 28 km away
  9. 1.58 km NE of San Martin, California · 16498 days ago · 8 km deep · 46 km away
  10. 1.530 km ENE of Soledad, California · 16498 days ago · 8 km deep · 38 km away
  11. 1.713 km SSE of Tres Pinos, California · 16497 days ago · 5 km deep · 14 km away
  12. 2.014 km SSE of Tres Pinos, California · 16497 days ago · 4 km deep · 14 km away
  13. 1.89 km NNE of East Foothills, California · 16497 days ago · 6 km deep · 88 km away
  14. 2.025 km NE of Soledad, California · 16496 days ago · 7 km deep · 28 km away
  15. 2.438 km W of Three Rocks, California · 16496 days ago · 6 km deep · 57 km away
  16. 2.938 km W of Three Rocks, California · 16496 days ago · 7 km deep · 57 km away
  17. 1.738 km W of Three Rocks, California · 16496 days ago · 4 km deep · 57 km away
  18. 2.213 km NE of East Foothills, California · 16496 days ago · 8 km deep · 86 km away
  19. 1.938 km W of Three Rocks, California · 16495 days ago · 8 km deep · 56 km away
  20. 1.738 km W of Three Rocks, California · 16495 days ago · 8 km deep · 57 km away
  21. 1.838 km W of Three Rocks, California · 16495 days ago · 7 km deep · 57 km away
  22. 1.638 km W of Three Rocks, California · 16495 days ago · 7 km deep · 57 km away
  23. 1.638 km W of Three Rocks, California · 16495 days ago · 6 km deep · 57 km away
  24. 1.637 km W of Three Rocks, California · 16495 days ago · 5 km deep · 57 km away
  25. 2.338 km W of Three Rocks, California · 16495 days ago · 8 km deep · 57 km away
  26. 2.516 km ENE of San Martin, California · 16495 days ago · 7 km deep · 48 km away
  27. 2.038 km W of Three Rocks, California · 16493 days ago · 6 km deep · 57 km away
  28. 2.69 km NE of Gilroy, California · 16492 days ago · 9 km deep · 37 km away
  29. 2.324 km NE of Greenfield, California · 16492 days ago · 3 km deep · 43 km away
  30. 1.738 km W of Three Rocks, California · 16492 days ago · 5 km deep · 57 km away
  31. 1.638 km W of Three Rocks, California · 16492 days ago · 5 km deep · 57 km away
  32. 2.78 km SSW of Tres Pinos, California · 16492 days ago · 2 km deep · 3 km away
  33. 3.18 km SSW of Tres Pinos, California · 16492 days ago · 2 km deep · 3 km away
  34. 2.737 km W of Three Rocks, California · 16491 days ago · 7 km deep · 57 km away
  35. 2.038 km W of Three Rocks, California · 16491 days ago · 5 km deep · 57 km away
  36. 1.638 km W of Three Rocks, California · 16491 days ago · 5 km deep · 56 km away
  37. 1.838 km W of Three Rocks, California · 16490 days ago · 4 km deep · 57 km away
  38. 1.838 km W of Three Rocks, California · 16490 days ago · 7 km deep · 57 km away
  39. 2.338 km W of Three Rocks, California · 16490 days ago · 4 km deep · 57 km away
  40. 1.821 km NE of Soledad, California · 16490 days ago · 6 km deep · 26 km away
  41. 1.738 km W of Three Rocks, California · 16490 days ago · 5 km deep · 57 km away
  42. 2.637 km W of Three Rocks, California · 16489 days ago · 7 km deep · 57 km away
  43. 1.5Central California · 16489 days ago · 4 km deep · 57 km away
  44. 1.613 km N of Morgan Hill, California · 16489 days ago · 6 km deep · 61 km away
  45. 1.97 km NE of Ridgemark, California · 16489 days ago · 6 km deep · 16 km away
  46. 1.88 km ENE of Gilroy, California · 16489 days ago · 6 km deep · 32 km away
  47. 1.619 km E of Tres Pinos, California · 16488 days ago · 5 km deep · 28 km away
  48. 1.539 km W of Three Rocks, California · 16488 days ago · 11 km deep · 56 km away
  49. 1.730 km WSW of Lockwood, California · 16488 days ago · 8 km deep · 96 km away
  50. 1.829 km NW of San Simeon, California · 16487 days ago · 0 km deep · 99 km away
  51. 1.611 km ESE of Tres Pinos, California · 16487 days ago · 10 km deep · 18 km away
  52. 1.538 km W of Three Rocks, California · 16487 days ago · 7 km deep · 57 km away
  53. 2.07 km E of East Foothills, California · 16487 days ago · 7 km deep · 77 km away
  54. 1.87 km E of East Foothills, California · 16487 days ago · 7 km deep · 78 km away
  55. 1.55 km SSW of Gilroy, California · 16486 days ago · 7 km deep · 31 km away
  56. 1.97 km N of Hollister, California · 16485 days ago · 7 km deep · 20 km away
  57. 1.97 km N of Hollister, California · 16485 days ago · 8 km deep · 20 km away
  58. 2.710 km ESE of East Foothills, California · 16484 days ago · 8 km deep · 73 km away
  59. 1.610 km E of Gilroy, California · 16484 days ago · 5 km deep · 30 km away
  60. 1.79 km NE of San Martin, California · 16484 days ago · 8 km deep · 47 km away

The first 60 of 172.

Before

  1. 1.730 km ENE of Soledad, California · 16501 days ago · 7 km deep · 38 km away
  2. 3.031 km ENE of Soledad, California · 16501 days ago · 9 km deep · 38 km away
  3. 1.99 km NE of Gilroy, California · 16502 days ago · 9 km deep · 38 km away
  4. 1.522 km NE of San Lucas, California · 16502 days ago · 6 km deep · 73 km away
  5. 1.54 km ENE of La Honda, California · 16503 days ago · 10 km deep · 99 km away
  6. 1.615 km E of Seven Trees, California · 16504 days ago · 6 km deep · 65 km away
  7. 1.824 km NE of Greenfield, California · 16504 days ago · 7 km deep · 43 km away
  8. 1.64 km NNE of East Foothills, California · 16505 days ago · 2 km deep · 84 km away
  9. 1.89 km NNW of Hollister, California · 16505 days ago · 4 km deep · 22 km away
  10. 2.123 km NE of San Ardo, California · 16507 days ago · 7 km deep · 84 km away
  11. 1.921 km NE of East Foothills, California · 16507 days ago · 3 km deep · 89 km away
  12. 1.69 km NE of San Martin, California · 16507 days ago · 9 km deep · 46 km away
  13. 2.27 km SSE of San Juan Bautista, California · 16507 days ago · 8 km deep · 11 km away
  14. 1.68 km NE of Gilroy, California · 16507 days ago · 8 km deep · 37 km away
  15. 1.723 km NE of Greenfield, California · 16507 days ago · 5 km deep · 44 km away
  16. 1.822 km NE of San Ardo, CA · 16507 days ago · 1 km deep · 89 km away
  17. 1.619 km SSE of Livermore, California · 16508 days ago · 2 km deep · 91 km away
  18. 2.023 km NNE of San Lucas, California · 16509 days ago · 7 km deep · 66 km away
  19. 2.52 km S of San Juan Bautista, California · 16509 days ago · 4 km deep · 16 km away
  20. 3.02 km SSW of San Juan Bautista, California · 16509 days ago · 5 km deep · 16 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1065942. Read Tue, Sep 29, 2026, 7:16 AM UTC.