California earthquakes

M1.6 earthquake 6 km NNE of Ridgemark, California

A magnitude 1.6 earthquake struck 6 km NNE of Ridgemark, California on Sat, Dec 21, 1985, 1:49 AM PST (09:49 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.8 5 km NNE 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
1.6 (md), micro
Local time
UTC
1985-12-21 09:49:43 UTC
Depth
5.9 km (3.6 mi), shallow
Epicenter
36.862° N, 121.329° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
42°
Stations used
52

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 190 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 2.85 km NNE of Tres Pinos, California · 14848 days ago · 5 km deep · 5 km away
  2. 1.66 km NNE of Tres Pinos, California · 14848 days ago · 4 km deep · 3 km away
  3. 2.45 km NE of Tres Pinos, California · 14848 days ago · 9 km deep · 6 km away
  4. 1.54 km NE of Tres Pinos, California · 14848 days ago · 7 km deep · 6 km away
  5. 2.15 km NNE of Tres Pinos, California · 14848 days ago · 5 km deep · 5 km away
  6. 1.84 km NNE of Tres Pinos, California · 14848 days ago · 5 km deep · 5 km away
  7. 2.05 km NE of Tres Pinos, California · 14848 days ago · 8 km deep · 6 km away
  8. 1.89 km ENE of Seven Trees, California · 14848 days ago · 6 km deep · 62 km away
  9. 2.16 km NE of Ridgemark, California · 14847 days ago · 7 km deep · 2 km away
  10. 1.64 km NNE of Tres Pinos, California · 14847 days ago · 4 km deep · 5 km away
  11. 1.64 km NE of Tres Pinos, California · 14847 days ago · 7 km deep · 6 km away
  12. 1.84 km NE of Tres Pinos, California · 14847 days ago · 8 km deep · 6 km away
  13. 2.024 km NE of Greenfield, California · 14847 days ago · 7 km deep · 49 km away
  14. 1.53 km ENE of Tres Pinos, California · 14847 days ago · 4 km deep · 8 km away
  15. 2.1Central California · 14847 days ago · 8 km deep · 7 km away
  16. 2.115 km SE of Carmel Valley Village, California · 14847 days ago · 4 km deep · 57 km away
  17. 1.610 km SSW of Tres Pinos, California · 14847 days ago · 7 km deep · 18 km away
  18. 2.23 km ENE of Tres Pinos, California · 14847 days ago · 8 km deep · 7 km away
  19. 2.0Central California · 14847 days ago · 8 km deep · 7 km away
  20. 1.92 km ENE of Tres Pinos, California · 14847 days ago · 4 km deep · 8 km away
  21. 1.65 km NNE of Tres Pinos, California · 14847 days ago · 6 km deep · 5 km away
  22. 1.85 km NE of Tres Pinos, California · 14846 days ago · 6 km deep · 5 km away
  23. 2.17 km NE of Interlaken, California · 14846 days ago · 10 km deep · 34 km away
  24. 1.75 km SE of Pleasanton, California · 14846 days ago · 5 km deep · 97 km away
  25. 1.512 km NNE of Morgan Hill, California · 14846 days ago · 6 km deep · 50 km away
  26. 2.34 km ENE of Tres Pinos, California · 14846 days ago · 9 km deep · 7 km away
  27. 1.55 km NE of Tres Pinos, California · 14846 days ago · 7 km deep · 5 km away
  28. 1.64 km ENE of Tres Pinos, California · 14846 days ago · 7 km deep · 7 km away
  29. 1.924 km ENE of Greenfield, California · 14846 days ago · 1 km deep · 56 km away
  30. 1.88 km NE of Morgan Hill, California · 14846 days ago · 3 km deep · 42 km away
  31. 1.95 km NNE of Tres Pinos, California · 14845 days ago · 8 km deep · 4 km away
  32. 1.73 km NE of Tres Pinos, California · 14845 days ago · 8 km deep · 7 km away
  33. 1.75 km NNE of Tres Pinos, California · 14845 days ago · 8 km deep · 5 km away
  34. 1.64 km SE of Pleasanton, California · 14845 days ago · 5 km deep · 97 km away
  35. 1.74 km SE of Pleasanton, California · 14845 days ago · 5 km deep · 97 km away
  36. 2.54 km SE of Pleasanton, California · 14845 days ago · 4 km deep · 98 km away
  37. 3.14 km SE of Pleasanton, California · 14845 days ago · 6 km deep · 97 km away
  38. 1.64 km SE of Pleasanton, California · 14845 days ago · 5 km deep · 97 km away
  39. 1.54 km SE of Pleasanton, California · 14845 days ago · 5 km deep · 97 km away
  40. 1.84 km NE of Tres Pinos, California · 14845 days ago · 8 km deep · 6 km away
  41. 1.74 km NNE of Tres Pinos, California · 14845 days ago · 7 km deep · 5 km away
  42. 1.64 km ESE of Pleasanton, California · 14845 days ago · 4 km deep · 97 km away
  43. 2.94 km SE of Pleasanton, California · 14845 days ago · 6 km deep · 97 km away
  44. 1.622 km NE of San Lucas, California · 14845 days ago · 4 km deep · 79 km away
  45. 1.74 km ESE of Pleasanton, California · 14845 days ago · 6 km deep · 97 km away
  46. 1.54 km ESE of Pleasanton, California · 14845 days ago · 5 km deep · 98 km away
  47. 1.84 km ESE of Pleasanton, California · 14845 days ago · 6 km deep · 97 km away
  48. 2.04 km SE of Pleasanton, California · 14845 days ago · 5 km deep · 97 km away
  49. 2.66 km NE of Ridgemark, California · 14845 days ago · 7 km deep · 2 km away
  50. 2.14 km SE of Pleasanton, California · 14845 days ago · 6 km deep · 97 km away
  51. 1.85 km NNE of Tres Pinos, California · 14845 days ago · 4 km deep · 4 km away
  52. 1.64 km ESE of Pleasanton, California · 14845 days ago · 6 km deep · 98 km away
  53. 2.04 km ESE of Pleasanton, California · 14845 days ago · 7 km deep · 98 km away
  54. 2.05 km ENE of Tres Pinos, California · 14845 days ago · 8 km deep · 9 km away
  55. 1.85 km NNE of Tres Pinos, California · 14845 days ago · 7 km deep · 5 km away
  56. 1.94 km NE of Tres Pinos, California · 14844 days ago · 8 km deep · 6 km away
  57. 1.621 km NE of Soledad, California · 14844 days ago · 8 km deep · 37 km away
  58. 2.115 km N of Morgan Hill, California · 14844 days ago · 2 km deep · 54 km away
  59. 1.65 km ENE of Tres Pinos, California · 14844 days ago · 4 km deep · 8 km away
  60. 3.14 km ESE of Pleasanton, California · 14844 days ago · 8 km deep · 98 km away

The first 60 of 190.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc61937. Read Tue, Sep 22, 2026, 8:36 PM UTC.