California earthquakes

M1.7 earthquake 5 km SSW of Ridgemark, California

A magnitude 1.7 earthquake struck 5 km SSW of Ridgemark, California on Thu, Sep 23, 1982, 3:11 PM PDT (22:11 UTC), 10 km (7 mi) below the surface.

A larger quake followed: M1.8 14 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
1.7 (md), micro
Local time
UTC
1982-09-23 22:11:27 UTC
Depth
10.5 km (6.5 mi), shallow
Epicenter
36.770° N, 121.397° 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, 0.5 km in depth
Magnitude uncertainty
±0.28
Depth from
From location
Station coverage gap
33°
Stations used
29

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.814 km S of Tres Pinos, California · 16051 days ago · 9 km deep · 15 km away
  2. 1.85 km SW of Gilroy, California · 16050 days ago · 3 km deep · 29 km away
  3. 1.522 km NNE of Soledad, California · 16050 days ago · 3 km deep · 26 km away
  4. 1.824 km NE of King City, California · 16049 days ago · 2 km deep · 58 km away
  5. 1.511 km S of Tres Pinos, California · 16049 days ago · 6 km deep · 12 km away
  6. 2.93 km W of San Juan Bautista, California · 16048 days ago · 5 km deep · 18 km away
  7. 1.615 km SW of Santa Cruz, California · 16048 days ago · 8 km deep · 68 km away
  8. 1.615 km S of Davenport, California · 16048 days ago · 6 km deep · 69 km away
  9. 1.524 km NE of Greenfield, California · 16047 days ago · 7 km deep · 47 km away
  10. 3.315 km SSE of Tres Pinos, California · 16047 days ago · 8 km deep · 16 km away
  11. 2.115 km SSE of Tres Pinos, California · 16047 days ago · 8 km deep · 16 km away
  12. 2.614 km SSE of Tres Pinos, California · 16046 days ago · 8 km deep · 16 km away
  13. 3.114 km SSE of Tres Pinos, California · 16046 days ago · 8 km deep · 16 km away
  14. 1.514 km SSE of Tres Pinos, California · 16046 days ago · 9 km deep · 16 km away
  15. 2.014 km SSE of Tres Pinos, California · 16046 days ago · 7 km deep · 16 km away
  16. 2.014 km S of Tres Pinos, California · 16046 days ago · 8 km deep · 15 km away
  17. 2.71 km ESE of Aromas, California · 16046 days ago · 9 km deep · 24 km away
  18. 3.015 km SSE of Tres Pinos, California · 16046 days ago · 8 km deep · 16 km away
  19. 1.612 km S of Tres Pinos, California · 16045 days ago · 7 km deep · 13 km away
  20. 1.95 km NNE of San Martin, California · 16044 days ago · 4 km deep · 43 km away
  21. 3.78 km NE of Corralitos, California · 16044 days ago · 12 km deep · 42 km away
  22. 1.711 km SSE of Tres Pinos, California · 16044 days ago · 4 km deep · 14 km away
  23. 1.823 km ENE of San Lucas, California · 16043 days ago · 5 km deep · 82 km away
  24. 1.92 km ENE of San Ardo, California · 16043 days ago · 12 km deep · 94 km away
  25. 3.122 km NNE of Soledad, California · 16042 days ago · 6 km deep · 26 km away
  26. 2.312 km NE of Morgan Hill, California · 16042 days ago · 6 km deep · 51 km away
  27. 1.914 km SSE of Tres Pinos, California · 16042 days ago · 6 km deep · 16 km away
  28. 2.814 km SSE of Tres Pinos, California · 16042 days ago · 8 km deep · 16 km away
  29. 2.014 km S of Tres Pinos, California · 16041 days ago · 7 km deep · 15 km away
  30. 2.125 km NNE of King City, California · 16040 days ago · 1 km deep · 55 km away
  31. 3.018 km SSE of Tres Pinos, California · 16039 days ago · 9 km deep · 20 km away
  32. 2.422 km ENE of Soledad, California · 16039 days ago · 3 km deep · 36 km away
  33. 1.630 km W of Lockwood, California · 16039 days ago · 0 km deep · 93 km away
  34. 2.07 km ESE of Tres Pinos, California · 16039 days ago · 9 km deep · 13 km away
  35. 1.521 km SSW of Three Rocks, California · 16038 days ago · 10 km deep · 94 km away
  36. 3.023 km NW of Coalinga, California · 16038 days ago · 9 km deep · 94 km away
  37. 2.322 km NW of Coalinga, California · 16038 days ago · 9 km deep · 95 km away
  38. 2.423 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 94 km away
  39. 5.422 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 94 km away
  40. 3.922 km NW of Coalinga, California · 16038 days ago · 18 km deep · 95 km away
  41. 2.5Central California · 16038 days ago · 10 km deep · 95 km away
  42. 2.523 km NW of Coalinga, California · 16038 days ago · 10 km deep · 93 km away
  43. 2.422 km NW of Coalinga, California · 16038 days ago · 6 km deep · 95 km away
  44. 3.023 km NW of Coalinga, California · 16038 days ago · 9 km deep · 93 km away
  45. 1.618 km NW of Coalinga, California · 16038 days ago · 9 km deep · 98 km away
  46. 1.621 km NW of Coalinga, California · 16038 days ago · 12 km deep · 96 km away
  47. 2.621 km SSW of Three Rocks, California · 16038 days ago · 10 km deep · 94 km away
  48. 1.921 km NNW of Coalinga, California · 16038 days ago · 12 km deep · 96 km away
  49. 1.723 km NW of Coalinga, California · 16038 days ago · 11 km deep · 94 km away
  50. 1.623 km SSW of Three Rocks, California · 16038 days ago · 9 km deep · 93 km away
  51. 1.921 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 98 km away
  52. 1.621 km NW of Coalinga, California · 16038 days ago · 8 km deep · 95 km away
  53. 1.622 km NW of Coalinga, California · 16038 days ago · 10 km deep · 94 km away
  54. 1.622 km NW of Coalinga, California · 16038 days ago · 11 km deep · 95 km away
  55. 1.521 km NW of Coalinga, California · 16038 days ago · 7 km deep · 96 km away
  56. 1.822 km NW of Coalinga, California · 16038 days ago · 12 km deep · 95 km away
  57. 2.223 km NW of Coalinga, California · 16038 days ago · 11 km deep · 92 km away
  58. 2.220 km SW of Los Banos, California · 16038 days ago · 0 km deep · 39 km away
  59. 1.923 km SSW of Three Rocks, California · 16038 days ago · 10 km deep · 93 km away
  60. 2.019 km NW of Coalinga, California · 16038 days ago · 10 km deep · 98 km away

The first 60 of 186.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1079416. Read Wed, Sep 23, 2026, 2:38 AM UTC.