California earthquakes

M1.5 earthquake 1 km E of Ridgemark, California

A magnitude 1.5 earthquake struck 1 km E of Ridgemark, California on Sun, Apr 16, 1989, 6:56 AM PDT (13:56 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.5 9 km S 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
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1989-04-16 13:56:06 UTC
Depth
3.4 km (2.1 mi), shallow
Epicenter
36.810° N, 121.350° 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, 0.7 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
54°
Stations used
31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 109 in the 60 days after this one and 76 in the 30 days before it.

After

  1. 2.422 km NNE of Soledad, California · 13684 days ago · 5 km deep · 27 km away
  2. 1.921 km NW of Coalinga, California · 13683 days ago · 8 km deep · 95 km away
  3. 1.825 km NE of Soledad, California · 13681 days ago · 8 km deep · 34 km away
  4. 1.56 km NNE of East Foothills, California · 13680 days ago · 7 km deep · 80 km away
  5. 2.023 km ENE of Soledad, California · 13679 days ago · 4 km deep · 43 km away
  6. 3.114 km N of Morgan Hill, California · 13679 days ago · 5 km deep · 56 km away
  7. 2.221 km NE of Soledad, California · 13679 days ago · 6 km deep · 35 km away
  8. 1.69 km NNE of East Foothills, California · 13678 days ago · 8 km deep · 81 km away
  9. 1.525 km NE of Greenfield, California · 13677 days ago · 8 km deep · 49 km away
  10. 1.79 km NNE of East Foothills, California · 13676 days ago · 8 km deep · 81 km away
  11. 1.619 km SSE of Livermore, California · 13676 days ago · 7 km deep · 85 km away
  12. 2.522 km NNE of Soledad, California · 13675 days ago · 6 km deep · 27 km away
  13. 2.121 km NE of Soledad, California · 13674 days ago · 2 km deep · 34 km away
  14. 1.830 km ENE of Soledad, California · 13674 days ago · 7 km deep · 39 km away
  15. 2.514 km N of Morgan Hill, California · 13674 days ago · 5 km deep · 57 km away
  16. 1.75 km SE of Aromas, California · 13674 days ago · 7 km deep · 23 km away
  17. 2.023 km NE of San Ardo, California · 13672 days ago · 7 km deep · 87 km away
  18. 2.323 km NE of San Ardo, California · 13672 days ago · 7 km deep · 87 km away
  19. 2.114 km SSE of Tres Pinos, California · 13672 days ago · 5 km deep · 17 km away
  20. 2.121 km NE of Soledad, California · 13671 days ago · 3 km deep · 32 km away
  21. 2.822 km NE of San Lucas, California · 13671 days ago · 6 km deep · 79 km away
  22. 1.823 km NE of San Lucas, California · 13671 days ago · 6 km deep · 78 km away
  23. 1.710 km S of Tres Pinos, California · 13671 days ago · 7 km deep · 12 km away
  24. 1.61 km NE of San Juan Bautista, California · 13668 days ago · 6 km deep · 17 km away
  25. 1.525 km NNE of San Ardo, California · 13668 days ago · 7 km deep · 85 km away
  26. 2.121 km NE of Soledad, California · 13668 days ago · 3 km deep · 32 km away
  27. 1.726 km NE of Greenfield, California · 13668 days ago · 8 km deep · 50 km away
  28. 2.27 km E of East Foothills, California · 13667 days ago · 8 km deep · 72 km away
  29. 1.69 km NE of Milpitas, California · 13666 days ago · 13 km deep · 86 km away
  30. 1.612 km SE of Tres Pinos, California · 13664 days ago · 8 km deep · 16 km away
  31. 3.08 km NE of San Martin, California · 13663 days ago · 8 km deep · 39 km away
  32. 2.221 km NE of Soledad, California · 13662 days ago · 8 km deep · 33 km away
  33. 1.99 km SSW of Tres Pinos, California · 13661 days ago · 3 km deep · 11 km away
  34. 1.810 km S of Tres Pinos, California · 13661 days ago · 5 km deep · 12 km away
  35. 1.624 km NE of Greenfield, California · 13661 days ago · 5 km deep · 47 km away
  36. 3.02 km ESE of Ladera, California · 13661 days ago · 5 km deep · 98 km away
  37. 1.819 km NE of East Foothills, California · 13660 days ago · 5 km deep · 81 km away
  38. 2.711 km NNE of Morgan Hill, California · 13660 days ago · 6 km deep · 52 km away
  39. 2.114 km E of Seven Trees, California · 13660 days ago · 3 km deep · 61 km away
  40. 1.58 km ENE of Gilroy, California · 13660 days ago · 6 km deep · 27 km away
  41. 3.14 km ESE of Interlaken, California · 13659 days ago · 12 km deep · 33 km away
  42. 1.84 km ESE of Interlaken, California · 13659 days ago · 12 km deep · 33 km away
  43. 2.18 km ESE of Livermore, California · 13659 days ago · 6 km deep · 97 km away
  44. 1.922 km NNE of Soledad, California · 13659 days ago · 5 km deep · 27 km away
  45. 2.522 km NNE of Soledad, California · 13659 days ago · 6 km deep · 27 km away
  46. 2.122 km NNE of Soledad, California · 13659 days ago · 6 km deep · 27 km away
  47. 1.837 km SSW of South Dos Palos, California · 13658 days ago · 5 km deep · 47 km away
  48. 2.237 km SSW of South Dos Palos, California · 13658 days ago · 5 km deep · 46 km away
  49. 1.838 km SSW of South Dos Palos, California · 13658 days ago · 3 km deep · 46 km away
  50. 1.513 km N of Morgan Hill, California · 13658 days ago · 4 km deep · 55 km away
  51. 1.619 km SSE of Livermore, California · 13658 days ago · 4 km deep · 85 km away
  52. 1.937 km SSW of South Dos Palos, California · 13658 days ago · 6 km deep · 47 km away
  53. 1.622 km ENE of San Ardo, California · 13656 days ago · 3 km deep · 99 km away
  54. 3.59 km S of Tres Pinos, California · 13655 days ago · 3 km deep · 12 km away
  55. 1.521 km NE of Soledad, California · 13655 days ago · 2 km deep · 29 km away
  56. 2.113 km S of Tres Pinos, California · 13654 days ago · 4 km deep · 16 km away
  57. 1.96 km SSE of Gilroy, California · 13654 days ago · 5 km deep · 23 km away
  58. 1.57 km NE of Hollister, California · 13654 days ago · 5 km deep · 11 km away
  59. 2.221 km NE of Soledad, California · 13654 days ago · 2 km deep · 35 km away
  60. 1.69 km NE of Gilroy, California · 13653 days ago · 8 km deep · 30 km away

The first 60 of 109.

Before

  1. 2.722 km NNE of Soledad, California · 13684 days ago · 5 km deep · 27 km away
  2. 2.622 km NNE of Soledad, California · 13684 days ago · 5 km deep · 27 km away
  3. 2.622 km NNE of Soledad, California · 13684 days ago · 6 km deep · 27 km away
  4. 1.911 km NW of Big Sur, California · 13684 days ago · 12 km deep · 73 km away
  5. 2.5Central California · 13684 days ago · 3 km deep · 100 km away
  6. 1.922 km NE of Soledad, California · 13685 days ago · 2 km deep · 36 km away
  7. 3.321 km NE of Soledad, California · 13686 days ago · 8 km deep · 30 km away
  8. 1.530 km ENE of Soledad, California · 13686 days ago · 7 km deep · 40 km away
  9. 2.224 km ENE of San Lucas, California · 13686 days ago · 8 km deep · 84 km away
  10. 3.16 km NNE of East Foothills, California · 13687 days ago · 8 km deep · 79 km away
  11. 1.55 km SE of Tres Pinos, California · 13689 days ago · 6 km deep · 9 km away
  12. 2.014 km NE of East Foothills, California · 13689 days ago · 8 km deep · 79 km away
  13. 2.421 km NE of Soledad, California · 13690 days ago · 5 km deep · 30 km away
  14. 1.66 km NNE of East Foothills, California · 13690 days ago · 8 km deep · 79 km away
  15. 2.421 km NE of Soledad, California · 13690 days ago · 2 km deep · 34 km away
  16. 3.36 km NNE of East Foothills, California · 13690 days ago · 9 km deep · 79 km away
  17. 2.037 km NE of Greenfield, California · 13690 days ago · 0 km deep · 48 km away
  18. 1.623 km ENE of San Lucas, California · 13691 days ago · 6 km deep · 80 km away
  19. 1.931 km ENE of Soledad, California · 13692 days ago · 4 km deep · 41 km away
  20. 2.524 km ENE of Soledad, California · 13693 days ago · 3 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc134690. Read Sat, Oct 3, 2026, 6:51 AM UTC.