California earthquakes

M1.8 earthquake 4 km SSW of Ridgemark, California

A magnitude 1.8 earthquake struck 4 km SSW of Ridgemark, California on Thu, Sep 23, 1982, 8:47 PM PDT (03:47 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M2.9 3 km W of San Juan Bautista, 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
1.8 (md), micro
Local time
UTC
1982-09-24 03:47:47 UTC
Depth
0.6 km (0.4 mi), shallow
Epicenter
36.773° N, 121.383° 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
±0.16
Depth from
From location
Station coverage gap
43°
Stations used
40

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. 1.511 km S of Tres Pinos, California · 16048 days ago · 6 km deep · 11 km away
  2. 2.93 km W of San Juan Bautista, California · 16048 days ago · 5 km deep · 19 km away
  3. 1.615 km SW of Santa Cruz, California · 16048 days ago · 8 km deep · 69 km away
  4. 1.615 km S of Davenport, California · 16048 days ago · 6 km deep · 70 km away
  5. 1.524 km NE of Greenfield, California · 16047 days ago · 7 km deep · 47 km away
  6. 3.315 km SSE of Tres Pinos, California · 16047 days ago · 8 km deep · 16 km away
  7. 2.115 km SSE of Tres Pinos, California · 16047 days ago · 8 km deep · 16 km away
  8. 2.614 km SSE of Tres Pinos, California · 16046 days ago · 8 km deep · 15 km away
  9. 3.114 km SSE of Tres Pinos, California · 16046 days ago · 8 km deep · 15 km away
  10. 1.514 km SSE of Tres Pinos, California · 16046 days ago · 9 km deep · 15 km away
  11. 2.014 km SSE of Tres Pinos, California · 16046 days ago · 7 km deep · 15 km away
  12. 2.014 km S of Tres Pinos, California · 16046 days ago · 8 km deep · 15 km away
  13. 2.71 km ESE of Aromas, California · 16046 days ago · 9 km deep · 25 km away
  14. 3.015 km SSE of Tres Pinos, California · 16046 days ago · 8 km deep · 15 km away
  15. 1.612 km S of Tres Pinos, California · 16045 days ago · 7 km deep · 13 km away
  16. 1.95 km NNE of San Martin, California · 16044 days ago · 4 km deep · 43 km away
  17. 3.78 km NE of Corralitos, California · 16044 days ago · 12 km deep · 43 km away
  18. 1.711 km SSE of Tres Pinos, California · 16044 days ago · 4 km deep · 13 km away
  19. 1.823 km ENE of San Lucas, California · 16043 days ago · 5 km deep · 81 km away
  20. 1.92 km ENE of San Ardo, California · 16043 days ago · 12 km deep · 94 km away
  21. 3.122 km NNE of Soledad, California · 16042 days ago · 6 km deep · 25 km away
  22. 2.312 km NE of Morgan Hill, California · 16042 days ago · 6 km deep · 51 km away
  23. 1.914 km SSE of Tres Pinos, California · 16042 days ago · 6 km deep · 15 km away
  24. 2.814 km SSE of Tres Pinos, California · 16042 days ago · 8 km deep · 15 km away
  25. 2.014 km S of Tres Pinos, California · 16041 days ago · 7 km deep · 14 km away
  26. 2.125 km NNE of King City, California · 16040 days ago · 1 km deep · 55 km away
  27. 3.018 km SSE of Tres Pinos, California · 16039 days ago · 9 km deep · 20 km away
  28. 2.422 km ENE of Soledad, California · 16039 days ago · 3 km deep · 36 km away
  29. 1.630 km W of Lockwood, California · 16039 days ago · 0 km deep · 93 km away
  30. 2.07 km ESE of Tres Pinos, California · 16039 days ago · 9 km deep · 12 km away
  31. 1.521 km SSW of Three Rocks, California · 16038 days ago · 10 km deep · 93 km away
  32. 3.023 km NW of Coalinga, California · 16038 days ago · 9 km deep · 93 km away
  33. 2.322 km NW of Coalinga, California · 16038 days ago · 9 km deep · 94 km away
  34. 2.423 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 93 km away
  35. 5.422 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 93 km away
  36. 3.922 km NW of Coalinga, California · 16038 days ago · 18 km deep · 94 km away
  37. 2.5Central California · 16038 days ago · 10 km deep · 94 km away
  38. 2.523 km NW of Coalinga, California · 16038 days ago · 10 km deep · 93 km away
  39. 2.422 km NW of Coalinga, California · 16038 days ago · 6 km deep · 94 km away
  40. 3.023 km NW of Coalinga, California · 16038 days ago · 9 km deep · 92 km away
  41. 1.618 km NW of Coalinga, California · 16038 days ago · 9 km deep · 97 km away
  42. 1.621 km NW of Coalinga, California · 16038 days ago · 12 km deep · 95 km away
  43. 2.621 km SSW of Three Rocks, California · 16038 days ago · 10 km deep · 93 km away
  44. 1.921 km NNW of Coalinga, California · 16038 days ago · 12 km deep · 95 km away
  45. 1.723 km NW of Coalinga, California · 16038 days ago · 11 km deep · 93 km away
  46. 1.623 km SSW of Three Rocks, California · 16038 days ago · 9 km deep · 93 km away
  47. 1.921 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 97 km away
  48. 1.621 km NW of Coalinga, California · 16038 days ago · 8 km deep · 95 km away
  49. 1.622 km NW of Coalinga, California · 16038 days ago · 10 km deep · 93 km away
  50. 1.622 km NW of Coalinga, California · 16038 days ago · 11 km deep · 94 km away
  51. 1.521 km NW of Coalinga, California · 16038 days ago · 7 km deep · 95 km away
  52. 1.822 km NW of Coalinga, California · 16038 days ago · 12 km deep · 94 km away
  53. 2.223 km NW of Coalinga, California · 16038 days ago · 11 km deep · 92 km away
  54. 2.220 km SW of Los Banos, California · 16038 days ago · 0 km deep · 38 km away
  55. 1.923 km SSW of Three Rocks, California · 16038 days ago · 10 km deep · 92 km away
  56. 2.019 km NW of Coalinga, California · 16038 days ago · 10 km deep · 97 km away
  57. 1.721 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 92 km away
  58. 4.221 km SSW of Three Rocks, California · 16038 days ago · 5 km deep · 92 km away
  59. 4.022 km SSW of Three Rocks, California · 16038 days ago · 11 km deep · 92 km away
  60. 1.722 km NW of Coalinga, California · 16038 days ago · 10 km deep · 93 km away

The first 60 of 186.

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1079428. Read Wed, Sep 23, 2026, 12:27 AM UTC.