California earthquakes

M1.8 earthquake 6 km NE of Ridgemark, California

A magnitude 1.8 earthquake struck 6 km NE of Ridgemark, California on Wed, Feb 12, 1986, 4:43 PM PST (00:43 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M5.7 15 km NE of East Foothills, 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
1986-02-13 00:43:15 UTC
Depth
6.9 km (4.3 mi), shallow
Epicenter
36.852° N, 121.315° 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, 0.5 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
55°
Stations used
30

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 190 in the 30 days before it.

After

  1. 1.812 km SE of La Honda, California · 14840 days ago · 9 km deep · 88 km away
  2. 1.611 km SE of La Honda, California · 14840 days ago · 8 km deep · 88 km away
  3. 2.05 km NNE of Tres Pinos, California · 14840 days ago · 6 km deep · 2 km away
  4. 1.61 km SW of Tres Pinos, California · 14840 days ago · 5 km deep · 8 km away
  5. 2.24 km SE of Tres Pinos, California · 14840 days ago · 7 km deep · 10 km away
  6. 2.15 km NNE of Tres Pinos, California · 14840 days ago · 7 km deep · 1 km away
  7. 1.95 km WSW of Fairmead, California · 14840 days ago · 4 km deep · 97 km away
  8. 1.94 km NE of Tres Pinos, California · 14840 days ago · 8 km deep · 5 km away
  9. 2.422 km SSW of Three Rocks, California · 14839 days ago · 10 km deep · 93 km away
  10. 1.622 km NE of San Ardo, California · 14839 days ago · 3 km deep · 90 km away
  11. 1.618 km ESE of East Foothills, California · 14839 days ago · 2 km deep · 59 km away
  12. 1.521 km NE of Soledad, California · 14839 days ago · 7 km deep · 36 km away
  13. 3.14 km ESE of Tres Pinos, California · 14839 days ago · 8 km deep · 10 km away
  14. 1.65 km SE of Tres Pinos, California · 14839 days ago · 9 km deep · 12 km away
  15. 1.930 km ENE of Soledad, California · 14838 days ago · 6 km deep · 40 km away
  16. 1.65 km NE of Tres Pinos, California · 14838 days ago · 6 km deep · 4 km away
  17. 1.62 km W of Tres Pinos, California · 14838 days ago · 4 km deep · 8 km away
  18. 2.16 km NE of Tres Pinos, California · 14838 days ago · 7 km deep · 4 km away
  19. 2.030 km ENE of Soledad, California · 14838 days ago · 8 km deep · 41 km away
  20. 2.131 km ENE of Soledad, California · 14838 days ago · 8 km deep · 41 km away
  21. 2.88 km ENE of San Martin, California · 14838 days ago · 7 km deep · 35 km away
  22. 2.87 km S of Sunol, California · 14838 days ago · 7 km deep · 91 km away
  23. 1.64 km NE of Tres Pinos, California · 14838 days ago · 4 km deep · 5 km away
  24. 1.85 km ENE of Tres Pinos, California · 14837 days ago · 7 km deep · 6 km away
  25. 1.54 km E of Tres Pinos, California · 14837 days ago · 9 km deep · 8 km away
  26. 1.921 km NE of Soledad, California · 14837 days ago · 4 km deep · 33 km away
  27. 2.16 km NNE of Tres Pinos, California · 14837 days ago · 8 km deep · 1 km away
  28. 2.67 km S of Sunol, California · 14836 days ago · 7 km deep · 91 km away
  29. 1.85 km NNE of Tres Pinos, California · 14836 days ago · 3 km deep · 3 km away
  30. 2.66 km NNE of Tres Pinos, California · 14836 days ago · 7 km deep · 1 km away
  31. 1.66 km SSW of Sunol, California · 14836 days ago · 5 km deep · 93 km away
  32. 1.613 km E of Seven Trees, California · 14835 days ago · 5 km deep · 61 km away
  33. 1.716 km N of Morgan Hill, California · 14835 days ago · 6 km deep · 56 km away
  34. 1.95 km NE of Tres Pinos, California · 14835 days ago · 5 km deep · 3 km away
  35. 1.65 km NNE of Tres Pinos, California · 14835 days ago · 3 km deep · 2 km away
  36. 1.60 km NNW of Tres Pinos, California · 14835 days ago · 6 km deep · 6 km away
  37. 3.14 km NE of Tres Pinos, California · 14834 days ago · 9 km deep · 4 km away
  38. 2.14 km NE of Tres Pinos, California · 14834 days ago · 8 km deep · 5 km away
  39. 1.930 km ENE of Soledad, California · 14834 days ago · 8 km deep · 43 km away
  40. 2.66 km N of Tres Pinos, California · 14834 days ago · 7 km deep · 1 km away
  41. 3.16 km NNE of Tres Pinos, California · 14834 days ago · 8 km deep · 1 km away
  42. 2.86 km NE of Ridgemark, California · 14833 days ago · 7 km deep · 1 km away
  43. 1.913 km N of Morgan Hill, California · 14833 days ago · 5 km deep · 53 km away
  44. 2.36 km NE of Ridgemark, California · 14833 days ago · 7 km deep · 1 km away
  45. 2.25 km W of Diablo Grande, California · 14833 days ago · -1 km deep · 61 km away
  46. 2.45 km SE of Tres Pinos, California · 14833 days ago · 7 km deep · 11 km away
  47. 1.925 km NE of King City, California · 14833 days ago · 1 km deep · 60 km away
  48. 2.011 km NE of Morgan Hill, California · 14833 days ago · 5 km deep · 46 km away
  49. 1.95 km ENE of Tres Pinos, California · 14833 days ago · 8 km deep · 7 km away
  50. 2.221 km NE of Soledad, California · 14833 days ago · 5 km deep · 33 km away
  51. 2.05 km NNE of Tres Pinos, California · 14832 days ago · 6 km deep · 2 km away
  52. 2.72 km SSW of San Juan Bautista, California · 14832 days ago · 7 km deep · 21 km away
  53. 1.96 km NE of Ridgemark, California · 14832 days ago · 2 km deep · 1 km away
  54. 1.715 km N of Morgan Hill, California · 14832 days ago · 6 km deep · 56 km away
  55. 2.0Central California · 14832 days ago · 0 km deep · 5 km away
  56. 1.63 km ENE of Tres Pinos, California · 14831 days ago · 9 km deep · 6 km away
  57. 1.86 km NNE of Tres Pinos, California · 14831 days ago · 6 km deep · 2 km away
  58. 1.723 km NE of San Ardo, California · 14831 days ago · 7 km deep · 89 km away
  59. 2.18 km NE of East Foothills, California · 14830 days ago · 6 km deep · 75 km away
  60. 1.55 km NNE of Tres Pinos, California · 14830 days ago · 6 km deep · 3 km away

The first 60 of 186.

Before

  1. 1.74 km SE of Tres Pinos, California · 14841 days ago · 7 km deep · 10 km away
  2. 1.76 km SSE of San Juan Bautista, California · 14841 days ago · 8 km deep · 19 km away
  3. 2.45 km NNE of Tres Pinos, California · 14841 days ago · 8 km deep · 2 km away
  4. 2.45 km NNE of Tres Pinos, California · 14841 days ago · 8 km deep · 2 km away
  5. 2.15 km NNE of Tres Pinos, California · 14841 days ago · 8 km deep · 2 km away
  6. 2.14 km NE of Tres Pinos, California · 14841 days ago · 8 km deep · 4 km away
  7. 1.99 km ESE of East Foothills, California · 14841 days ago · 5 km deep · 66 km away
  8. 1.824 km ENE of Greenfield, California · 14841 days ago · 6 km deep · 53 km away
  9. 2.34 km NE of Tres Pinos, California · 14841 days ago · 9 km deep · 4 km away
  10. 2.09 km SW of Tres Pinos, California · 14842 days ago · 3 km deep · 15 km away
  11. 1.723 km SSW of South Dos Palos, California · 14842 days ago · 6 km deep · 48 km away
  12. 1.615 km E of Seven Trees, California · 14842 days ago · 3 km deep · 58 km away
  13. 1.69 km NNW of Hollister, California · 14842 days ago · 5 km deep · 14 km away
  14. 2.116 km NE of East Foothills, California · 14842 days ago · 6 km deep · 79 km away
  15. 1.75 km NE of Tres Pinos, California · 14842 days ago · 6 km deep · 4 km away
  16. 1.74 km NE of Tres Pinos, California · 14843 days ago · 7 km deep · 5 km away
  17. 2.832 km NE of San Lucas, California · 14843 days ago · 9 km deep · 76 km away
  18. 1.66 km NE of East Foothills, California · 14843 days ago · 8 km deep · 76 km away
  19. 2.06 km NNE of Tres Pinos, California · 14843 days ago · 8 km deep · 1 km away
  20. 1.618 km NNE of Morgan Hill, California · 14843 days ago · 6 km deep · 51 km away

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From the USGS Earthquake Hazards Program and its partner networks, event nc66393. Read Thu, Oct 1, 2026, 11:31 AM UTC.