California earthquakes

M1.7 earthquake 6 km NNE of Blackhawk, California

A magnitude 1.7 earthquake struck 6 km NNE of Blackhawk, California on Thu, Nov 21, 1985, 3:20 PM PST (23:20 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M3.4 6 km NNE of Interlaken, California. This one was a foreshock.

Blackhawk 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
1985-11-21 23:20:06 UTC
Depth
16.2 km (10.0 mi), shallow
Epicenter
37.878° N, 121.877° 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 3.0 km horizontally, 2.7 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
260°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 100 in the 60 days after this one and 36 in the 30 days before it.

After

  1. 3.09 km ENE of Gilroy, California · 14922 days ago · 9 km deep · 99 km away
  2. 1.816 km SSE of Livermore, California · 14922 days ago · 5 km deep · 40 km away
  3. 1.616 km SSE of Livermore, California · 14922 days ago · 5 km deep · 40 km away
  4. 2.48 km NE of Morgan Hill, California · 14921 days ago · 3 km deep · 82 km away
  5. 1.515 km NE of East Foothills, California · 14921 days ago · 8 km deep · 48 km away
  6. 2.711 km ESE of East Foothills, California · 14920 days ago · 7 km deep · 62 km away
  7. 2.211 km ESE of East Foothills, California · 14920 days ago · 7 km deep · 62 km away
  8. 1.55 km ENE of Fremont, California · 14917 days ago · 11 km deep · 36 km away
  9. 2.35 km SW of Sunol, California · 14917 days ago · 11 km deep · 36 km away
  10. 2.11 km WSW of Roseland, California · 14916 days ago · 6 km deep · 97 km away
  11. 2.111 km SSE of Elmira, California · 14916 days ago · 13 km deep · 42 km away
  12. 2.83 km ESE of Rodeo, California · 14916 days ago · 7 km deep · 35 km away
  13. 1.78 km SE of Sunol, California · 14915 days ago · 3 km deep · 38 km away
  14. 1.66 km SW of Mountain House, California · 14912 days ago · 14 km deep · 30 km away
  15. 2.19 km ESE of East Foothills, California · 14912 days ago · 5 km deep · 60 km away
  16. 1.53 km N of East Foothills, California · 14912 days ago · 0 km deep · 52 km away
  17. 2.110 km SE of Livermore, California · 14911 days ago · 8 km deep · 33 km away
  18. 2.610 km SE of Livermore, California · 14911 days ago · 9 km deep · 33 km away
  19. 2.09 km SE of Livermore, California · 14911 days ago · 9 km deep · 33 km away
  20. 2.09 km SE of Livermore, California · 14911 days ago · 9 km deep · 33 km away
  21. 1.97 km NNE of Milpitas, California · 14910 days ago · 6 km deep · 43 km away
  22. 2.19 km SE of Livermore, California · 14910 days ago · 8 km deep · 33 km away
  23. 1.69 km SE of Livermore, California · 14910 days ago · 8 km deep · 33 km away
  24. 3.314 km N of Morgan Hill, California · 14910 days ago · 6 km deep · 71 km away
  25. 2.614 km NNW of Moskowite Corner, California · 14908 days ago · 3 km deep · 83 km away
  26. 1.73 km W of Glen Ellen, California · 14908 days ago · 9 km deep · 81 km away
  27. 2.317 km ENE of East Foothills, California · 14908 days ago · 5 km deep · 56 km away
  28. 2.04 km SSE of Seven Trees, California · 14906 days ago · 6 km deep · 71 km away
  29. 1.512 km N of Morgan Hill, California · 14906 days ago · 6 km deep · 74 km away
  30. 1.816 km E of Seven Trees, California · 14905 days ago · 8 km deep · 69 km away
  31. 2.73 km N of East Foothills, California · 14904 days ago · 1 km deep · 52 km away
  32. 2.45 km SSW of Calistoga, California · 14904 days ago · 5 km deep · 96 km away
  33. 2.13 km N of East Foothills, California · 14903 days ago · 0 km deep · 52 km away
  34. 2.05 km NW of Broadmoor, California · 14902 days ago · 6 km deep · 61 km away
  35. 3.06 km NNE of Interlaken, California · 14901 days ago · 11 km deep · 97 km away
  36. 3.46 km NNE of Interlaken, California · 14901 days ago · 12 km deep · 97 km away
  37. 2.17 km NNE of Interlaken, California · 14901 days ago · 10 km deep · 97 km away
  38. 1.96 km NNE of Interlaken, California · 14901 days ago · 11 km deep · 97 km away
  39. 1.96 km NE of East Foothills, California · 14901 days ago · 4 km deep · 52 km away
  40. 1.78 km ENE of Morgan Hill, California · 14901 days ago · 3 km deep · 83 km away
  41. 1.616 km E of Seven Trees, California · 14901 days ago · 6 km deep · 70 km away
  42. 1.63 km N of East Foothills, California · 14901 days ago · 0 km deep · 52 km away
  43. 1.77 km W of Gilroy, California · 14900 days ago · 9 km deep · 100 km away
  44. 2.59 km NE of San Martin, California · 14900 days ago · 8 km deep · 85 km away
  45. 2.86 km NE of East Foothills, California · 14899 days ago · 4 km deep · 52 km away
  46. 2.17 km NE of Interlaken, California · 14898 days ago · 10 km deep · 100 km away
  47. 1.90 km NNW of Concord, California · 14898 days ago · 16 km deep · 18 km away
  48. 2.50 km W of Pleasant Hill, California · 14897 days ago · 9 km deep · 18 km away
  49. 2.38 km WSW of Pescadero, California · 14895 days ago · 9 km deep · 89 km away
  50. 1.613 km N of Morgan Hill, California · 14895 days ago · 2 km deep · 73 km away
  51. 2.13 km SSE of Sunol, California · 14894 days ago · 8 km deep · 34 km away
  52. 2.03 km N of Pittsburg, California · 14894 days ago · 18 km deep · 20 km away
  53. 2.011 km E of Blackhawk, California · 14894 days ago · 21 km deep · 9 km away
  54. 2.74 km NNE of Ripon, California · 14892 days ago · 2 km deep · 69 km away
  55. 1.93 km SW of San Bruno, California · 14888 days ago · 11 km deep · 58 km away
  56. 1.57 km NE of Interlaken, California · 14888 days ago · 10 km deep · 100 km away
  57. 1.512 km N of Morgan Hill, California · 14887 days ago · 6 km deep · 74 km away
  58. 3.00 km S of Concord, California · 14887 days ago · 16 km deep · 17 km away
  59. 2.30 km SE of Concord, California · 14886 days ago · 14 km deep · 17 km away
  60. 2.33 km NNE of Grayson, California · 14884 days ago · 8 km deep · 70 km away

The first 60 of 100.

Before

  1. 1.80 km NE of Concord, California · 14924 days ago · 16 km deep · 17 km away
  2. 1.80 km S of Concord, California · 14924 days ago · 15 km deep · 17 km away
  3. 1.614 km E of Seven Trees, California · 14927 days ago · 1 km deep · 67 km away
  4. 2.29 km NNE of Livermore, California · 14927 days ago · 13 km deep · 20 km away
  5. 1.914 km E of Seven Trees, California · 14927 days ago · 1 km deep · 67 km away
  6. 2.17 km E of East Foothills, California · 14928 days ago · 6 km deep · 57 km away
  7. 2.94 km E of Fairview, California · 14928 days ago · 11 km deep · 25 km away
  8. 2.910 km E of Livermore, California · 14929 days ago · 2 km deep · 30 km away
  9. 2.113 km N of Morgan Hill, California · 14930 days ago · 4 km deep · 73 km away
  10. 2.06 km NE of East Foothills, California · 14930 days ago · 10 km deep · 50 km away
  11. 1.914 km E of Angwin, California · 14931 days ago · 1 km deep · 87 km away
  12. 1.914 km E of Seven Trees, California · 14932 days ago · 3 km deep · 67 km away
  13. 2.18 km NE of Milpitas, California · 14933 days ago · 7 km deep · 45 km away
  14. 1.714 km E of Seven Trees, California · 14933 days ago · 2 km deep · 67 km away
  15. 1.712 km SSE of Livermore, California · 14934 days ago · 7 km deep · 37 km away
  16. 2.115 km ESE of Suisun, California · 14934 days ago · 11 km deep · 34 km away
  17. 1.915 km E of Seven Trees, California · 14935 days ago · 6 km deep · 68 km away
  18. 1.91 km ENE of Green Valley, California · 14937 days ago · 12 km deep · 49 km away
  19. 2.23 km WSW of Green Valley, California · 14937 days ago · 7 km deep · 49 km away
  20. 1.57 km ENE of Penngrove, California · 14937 days ago · 8 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc61192. Read Wed, Sep 30, 2026, 11:56 PM UTC.