California earthquakes

M1.6 earthquake 10 km WSW of Ridgemark, California

A magnitude 1.6 earthquake struck 10 km WSW of Ridgemark, California on Fri, Jul 22, 1983, 1:03 AM PDT (08:03 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.0 32 km NE of Soledad, 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1983-07-22 08:03:50 UTC
Depth
5.8 km (3.6 mi), shallow
Epicenter
36.763° N, 121.470° 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 0.3 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
46°
Stations used
37

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 153 in the 60 days after this one and 147 in the 30 days before it.

After

  1. 1.924 km SE of Big Sur, California · 15777 days ago · 3 km deep · 71 km away
  2. 2.336 km SSW of South Dos Palos, California · 15777 days ago · 8 km deep · 61 km away
  3. 1.727 km ESE of Tres Pinos, California · 15776 days ago · 0 km deep · 40 km away
  4. 1.69 km NW of Hollister, California · 15773 days ago · 5 km deep · 18 km away
  5. 2.525 km ESE of Big Sur, California · 15773 days ago · 6 km deep · 67 km away
  6. 1.725 km ESE of Big Sur, California · 15773 days ago · 7 km deep · 68 km away
  7. 2.925 km ESE of Big Sur, California · 15773 days ago · 8 km deep · 69 km away
  8. 2.514 km NE of Morgan Hill, California · 15773 days ago · 7 km deep · 51 km away
  9. 1.817 km ENE of East Foothills, California · 15772 days ago · 5 km deep · 75 km away
  10. 1.924 km NE of Greenfield, California · 15772 days ago · 1 km deep · 54 km away
  11. 2.03 km N of East Foothills, California · 15771 days ago · 0 km deep · 79 km away
  12. 1.99 km NE of San Martin, California · 15771 days ago · 7 km deep · 43 km away
  13. 1.613 km SE of Sunol, California · 15771 days ago · 4 km deep · 88 km away
  14. 1.69 km ESE of East Foothills, California · 15771 days ago · 8 km deep · 69 km away
  15. 2.916 km NE of East Foothills, California · 15770 days ago · 6 km deep · 80 km away
  16. 2.59 km NE of Gilroy, California · 15770 days ago · 7 km deep · 34 km away
  17. 2.511 km S of Tres Pinos, California · 15770 days ago · 3 km deep · 16 km away
  18. 2.7Central California · 15769 days ago · 6 km deep · 54 km away
  19. 1.923 km ENE of San Lucas, California · 15768 days ago · 4 km deep · 83 km away
  20. 2.65 km NE of Tres Pinos, California · 15768 days ago · 4 km deep · 18 km away
  21. 3.18 km SE of San Juan Bautista, California · 15768 days ago · 5 km deep · 3 km away
  22. 2.018 km SSE of Tres Pinos, California · 15768 days ago · 5 km deep · 25 km away
  23. 1.922 km ENE of Soledad, California · 15768 days ago · 2 km deep · 40 km away
  24. 2.515 km SE of Livermore, California · 15767 days ago · 2 km deep · 91 km away
  25. 2.622 km ENE of Tres Pinos, California · 15767 days ago · 0 km deep · 36 km away
  26. 2.724 km NE of Greenfield, California · 15766 days ago · 1 km deep · 52 km away
  27. 2.39 km ESE of East Foothills, California · 15766 days ago · 3 km deep · 68 km away
  28. 2.06 km SE of Tres Pinos, California · 15766 days ago · 9 km deep · 18 km away
  29. 1.99 km ESE of East Foothills, California · 15766 days ago · 3 km deep · 68 km away
  30. 1.524 km ENE of San Lucas, California · 15764 days ago · 5 km deep · 83 km away
  31. 1.722 km NE of Soledad, California · 15764 days ago · 3 km deep · 34 km away
  32. 2.015 km SSE of Tres Pinos, California · 15763 days ago · 5 km deep · 21 km away
  33. 1.615 km SSE of Tres Pinos, California · 15763 days ago · 5 km deep · 21 km away
  34. 1.623 km ENE of San Lucas, California · 15763 days ago · 5 km deep · 83 km away
  35. 2.39 km ESE of East Foothills, California · 15763 days ago · 7 km deep · 69 km away
  36. 1.69 km ESE of East Foothills, California · 15763 days ago · 7 km deep · 69 km away
  37. 1.725 km NE of Greenfield, California · 15762 days ago · 4 km deep · 51 km away
  38. 1.58 km E of East Foothills, California · 15762 days ago · 7 km deep · 71 km away
  39. 1.623 km NE of Soledad, California · 15762 days ago · 4 km deep · 40 km away
  40. 1.819 km WSW of South Dos Palos, California · 15761 days ago · 6 km deep · 58 km away
  41. 2.123 km NE of Soledad, California · 15761 days ago · 5 km deep · 36 km away
  42. 1.71 km E of Tres Pinos, California · 15761 days ago · 8 km deep · 15 km away
  43. 1.514 km SSE of Tres Pinos, California · 15761 days ago · 4 km deep · 20 km away
  44. 1.923 km NE of San Ardo, California · 15761 days ago · 7 km deep · 90 km away
  45. 1.923 km ENE of King City, California · 15760 days ago · 4 km deep · 71 km away
  46. 1.917 km SSE of Tres Pinos, California · 15760 days ago · 6 km deep · 24 km away
  47. 4.032 km NE of Soledad, California · 15760 days ago · 11 km deep · 42 km away
  48. 1.830 km ENE of Soledad, California · 15759 days ago · 8 km deep · 44 km away
  49. 2.321 km NE of Soledad, California · 15759 days ago · 2 km deep · 36 km away
  50. 3.231 km NE of Soledad, California · 15758 days ago · 10 km deep · 43 km away
  51. 2.15 km SW of Gilroy, California · 15758 days ago · 4 km deep · 27 km away
  52. 2.117 km SSE of Tres Pinos, California · 15758 days ago · 6 km deep · 24 km away
  53. 2.936 km SSW of South Dos Palos, California · 15758 days ago · 7 km deep · 55 km away
  54. 1.6Central California · 15758 days ago · 3 km deep · 26 km away
  55. 1.621 km ESE of Big Sur, California · 15757 days ago · 10 km deep · 63 km away
  56. 2.231 km ENE of Soledad, California · 15757 days ago · 8 km deep · 44 km away
  57. 1.830 km ENE of Soledad, California · 15756 days ago · 7 km deep · 45 km away
  58. 1.925 km NE of Soledad, California · 15756 days ago · 8 km deep · 39 km away
  59. 2.238 km SSW of South Dos Palos, California · 15756 days ago · 6 km deep · 56 km away
  60. 1.515 km SE of Livermore, California · 15755 days ago · 4 km deep · 92 km away

The first 60 of 153.

Before

  1. 1.8Central California · 15777 days ago · 1 km deep · 29 km away
  2. 1.540 km SSW of South Dos Palos, California · 15777 days ago · 6 km deep · 54 km away
  3. 2.725 km ENE of Greenfield, California · 15777 days ago · 4 km deep · 55 km away
  4. 2.626 km ESE of Big Sur, California · 15778 days ago · 6 km deep · 67 km away
  5. 2.825 km ESE of Big Sur, California · 15778 days ago · 6 km deep · 67 km away
  6. 2.325 km ESE of Big Sur, California · 15778 days ago · 8 km deep · 68 km away
  7. 2.025 km ESE of Big Sur, California · 15778 days ago · 7 km deep · 68 km away
  8. 1.925 km ESE of Big Sur, California · 15778 days ago · 8 km deep · 68 km away
  9. 1.925 km ESE of Big Sur, California · 15778 days ago · 5 km deep · 69 km away
  10. 1.925 km ESE of Big Sur, California · 15778 days ago · 6 km deep · 69 km away
  11. 1.727 km WSW of Greenfield, California · 15778 days ago · 3 km deep · 63 km away
  12. 1.725 km SE of Big Sur, California · 15778 days ago · 9 km deep · 70 km away
  13. 2.325 km ESE of Big Sur, California · 15778 days ago · 8 km deep · 67 km away
  14. 1.926 km ESE of Big Sur, California · 15778 days ago · 2 km deep · 67 km away
  15. 1.826 km ESE of Big Sur, California · 15778 days ago · 9 km deep · 68 km away
  16. 1.925 km ESE of Big Sur, California · 15778 days ago · 8 km deep · 67 km away
  17. 2.526 km ESE of Big Sur, California · 15778 days ago · 5 km deep · 67 km away
  18. 1.728 km ESE of Big Sur, California · 15778 days ago · 8 km deep · 68 km away
  19. 2.125 km SE of Big Sur, California · 15778 days ago · 8 km deep · 70 km away
  20. 2.025 km SE of Big Sur, California · 15778 days ago · 6 km deep · 70 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1099049. Read Thu, Oct 1, 2026, 7:26 AM UTC.