California earthquakes

M1.8 earthquake 10 km WSW of Ridgemark, California

A magnitude 1.8 earthquake struck 10 km WSW of Ridgemark, California on Thu, Jul 18, 2002, 8:17 AM PDT (15:17 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.9 15 km SSE 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2002-07-18 15:17:47 UTC
Depth
5.8 km (3.6 mi), shallow
Epicenter
36.766° N, 121.464° 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
56°
Stations used
45

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 125 in the 60 days after this one and 89 in the 30 days before it.

After

  1. 1.64 km ENE of La Honda, California · 8845 days ago · 0 km deep · 93 km away
  2. 1.822 km WSW of Three Rocks, California · 8845 days ago · 15 km deep · 81 km away
  3. 1.732 km WNW of Coalinga, California · 8845 days ago · 13 km deep · 89 km away
  4. 1.85 km SSW of Gilroy, California · 8844 days ago · 4 km deep · 25 km away
  5. 2.121 km SE of Big Sur, California · 8843 days ago · 2 km deep · 73 km away
  6. 1.616 km N of Morgan Hill, California · 8843 days ago · 6 km deep · 59 km away
  7. 2.73 km N of East Foothills, California · 8843 days ago · 2 km deep · 79 km away
  8. 2.43 km N of East Foothills, California · 8843 days ago · 0 km deep · 78 km away
  9. 1.623 km W of Three Rocks, California · 8843 days ago · 9 km deep · 80 km away
  10. 1.87 km ENE of Gilroy, California · 8843 days ago · 7 km deep · 30 km away
  11. 1.721 km NE of Soledad, California · 8842 days ago · 5 km deep · 39 km away
  12. 2.58 km ENE of San Martin, California · 8842 days ago · 8 km deep · 40 km away
  13. 2.73 km N of East Foothills, California · 8842 days ago · 2 km deep · 79 km away
  14. 2.93 km N of East Foothills, California · 8842 days ago · 0 km deep · 78 km away
  15. 1.66 km WSW of Gilroy, California · 8842 days ago · 5 km deep · 29 km away
  16. 1.612 km SSE of Tres Pinos, California · 8841 days ago · 7 km deep · 18 km away
  17. 1.98 km SE of San Juan Bautista, California · 8841 days ago · 3 km deep · 3 km away
  18. 2.40 km ENE of Gonzales, California · 8841 days ago · 11 km deep · 29 km away
  19. 2.05 km NNE of Milpitas, California · 8840 days ago · 0 km deep · 86 km away
  20. 1.77 km NE of San Juan Bautista, California · 8840 days ago · 9 km deep · 15 km away
  21. 1.74 km S of Gilroy, California · 8840 days ago · 0 km deep · 24 km away
  22. 2.04 km SSW of Gilroy, California · 8839 days ago · 7 km deep · 25 km away
  23. 1.921 km NNE of Soledad, California · 8839 days ago · 7 km deep · 31 km away
  24. 1.623 km ENE of Soledad, California · 8838 days ago · 4 km deep · 45 km away
  25. 1.93 km ESE of Tres Pinos, California · 8837 days ago · 9 km deep · 16 km away
  26. 1.63 km NNW of Hollister, California · 8837 days ago · 8 km deep · 13 km away
  27. 1.72 km W of Ridgemark, California · 8837 days ago · 6 km deep · 8 km away
  28. 1.77 km E of East Foothills, California · 8837 days ago · 5 km deep · 71 km away
  29. 2.22 km E of Aromas, California · 8836 days ago · 7 km deep · 19 km away
  30. 1.79 km ESE of Livermore, California · 8835 days ago · 1 km deep · 100 km away
  31. 1.57 km NE of San Juan Bautista, California · 8835 days ago · 9 km deep · 15 km away
  32. 1.73 km NNE of Day Valley, California · 8834 days ago · 15 km deep · 47 km away
  33. 1.923 km NE of Soledad, California · 8834 days ago · 9 km deep · 38 km away
  34. 2.021 km NE of Soledad, California · 8834 days ago · 3 km deep · 35 km away
  35. 1.71 km E of Aromas, California · 8834 days ago · 8 km deep · 19 km away
  36. 2.71 km ESE of Aromas, California · 8832 days ago · 8 km deep · 20 km away
  37. 1.812 km S of Tres Pinos, California · 8832 days ago · 2 km deep · 17 km away
  38. 1.67 km E of East Foothills, California · 8832 days ago · 6 km deep · 71 km away
  39. 1.624 km NE of Soledad, California · 8832 days ago · 8 km deep · 38 km away
  40. 1.92 km ESE of Aromas, California · 8831 days ago · 8 km deep · 19 km away
  41. 2.024 km ENE of Greenfield, California · 8831 days ago · 5 km deep · 58 km away
  42. 1.523 km NE of Soledad, California · 8830 days ago · 9 km deep · 37 km away
  43. 1.622 km NNE of Soledad, California · 8830 days ago · 1 km deep · 30 km away
  44. 2.06 km NNE of Milpitas, California · 8830 days ago · 0 km deep · 87 km away
  45. 1.528 km SE of Big Sur, California · 8829 days ago · 8 km deep · 78 km away
  46. 2.13 km SSE of San Juan Bautista, California · 8829 days ago · 4 km deep · 8 km away
  47. 1.824 km WNW of Coalinga, California · 8827 days ago · 12 km deep · 97 km away
  48. 2.42 km SW of San Juan Bautista, California · 8827 days ago · 7 km deep · 11 km away
  49. 1.615 km E of Seven Trees, California · 8826 days ago · 2 km deep · 61 km away
  50. 1.74 km S of Diablo Grande, California · 8826 days ago · 7 km deep · 68 km away
  51. 1.97 km E of East Foothills, California · 8826 days ago · 7 km deep · 71 km away
  52. 1.624 km ENE of Soledad, California · 8825 days ago · 3 km deep · 47 km away
  53. 1.93 km N of East Foothills, California · 8824 days ago · 1 km deep · 78 km away
  54. 1.633 km W of Three Rocks, California · 8824 days ago · 8 km deep · 68 km away
  55. 2.422 km NE of Soledad, California · 8824 days ago · 6 km deep · 32 km away
  56. 1.68 km W of San Ardo, California · 8823 days ago · 8 km deep · 92 km away
  57. 2.213 km S of Tres Pinos, California · 8822 days ago · 3 km deep · 18 km away
  58. 1.817 km SSE of Tres Pinos, California · 8821 days ago · 4 km deep · 23 km away
  59. 1.822 km NE of Soledad, California · 8821 days ago · 3 km deep · 32 km away
  60. 1.85 km NNE of Milpitas, California · 8819 days ago · 0 km deep · 86 km away

The first 60 of 125.

Before

  1. 2.44 km ESE of Sunol, California · 8845 days ago · 5 km deep · 96 km away
  2. 1.715 km E of Seven Trees, California · 8846 days ago · 6 km deep · 61 km away
  3. 3.115 km E of Seven Trees, California · 8846 days ago · 6 km deep · 61 km away
  4. 2.817 km SSE of Tres Pinos, California · 8846 days ago · 10 km deep · 23 km away
  5. 2.37 km ENE of Gilroy, California · 8846 days ago · 8 km deep · 30 km away
  6. 2.325 km SE of Tres Pinos, California · 8846 days ago · 8 km deep · 35 km away
  7. 1.63 km N of East Foothills, California · 8847 days ago · 1 km deep · 79 km away
  8. 2.117 km SSE of Tres Pinos, California · 8847 days ago · 6 km deep · 23 km away
  9. 2.622 km NE of Soledad, California · 8847 days ago · 3 km deep · 32 km away
  10. 1.76 km NNE of East Foothills, California · 8847 days ago · 6 km deep · 80 km away
  11. 1.63 km S of Sunol, California · 8847 days ago · 8 km deep · 96 km away
  12. 2.519 km SW of King City, California · 8847 days ago · 12 km deep · 76 km away
  13. 1.96 km E of East Foothills, California · 8848 days ago · 4 km deep · 74 km away
  14. 1.63 km N of East Foothills, California · 8848 days ago · 1 km deep · 79 km away
  15. 1.725 km ENE of Soledad, California · 8848 days ago · 9 km deep · 41 km away
  16. 2.03 km N of East Foothills, California · 8848 days ago · 1 km deep · 79 km away
  17. 1.88 km N of East Foothills, California · 8848 days ago · 6 km deep · 83 km away
  18. 1.83 km N of East Foothills, California · 8848 days ago · 0 km deep · 78 km away
  19. 1.923 km NNE of San Lucas, California · 8848 days ago · 3 km deep · 72 km away
  20. 1.72 km W of Ridgemark, California · 8849 days ago · 7 km deep · 8 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc21236073. Read Mon, Oct 5, 2026, 12:59 PM UTC.