California earthquakes

M2.0 earthquake 11 km E of Blackhawk, California

A magnitude 2.0 earthquake struck 11 km E of Blackhawk, California on Fri, Dec 20, 1985, 4:40 PM PST (00:40 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M2.7 4 km NNE of Ripon, 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
2.0 (md), micro
Local time
UTC
1985-12-21 00:40:59 UTC
Depth
20.6 km (12.8 mi), shallow
Epicenter
37.839° N, 121.781° 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, 0.4 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
94°
Stations used
35

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 111 in the 60 days after this one and 53 in the 30 days before it.

After

  1. 2.74 km NNE of Ripon, California · 14884 days ago · 2 km deep · 61 km away
  2. 1.93 km SW of San Bruno, California · 14880 days ago · 11 km deep · 64 km away
  3. 1.57 km NE of Interlaken, California · 14880 days ago · 10 km deep · 94 km away
  4. 1.512 km N of Morgan Hill, California · 14878 days ago · 6 km deep · 68 km away
  5. 3.00 km S of Concord, California · 14878 days ago · 16 km deep · 27 km away
  6. 2.30 km SE of Concord, California · 14878 days ago · 14 km deep · 26 km away
  7. 2.33 km NNE of Grayson, California · 14876 days ago · 8 km deep · 60 km away
  8. 1.814 km E of Seven Trees, California · 14875 days ago · 3 km deep · 62 km away
  9. 1.714 km E of Seven Trees, California · 14875 days ago · 3 km deep · 62 km away
  10. 1.67 km NE of Interlaken, California · 14875 days ago · 11 km deep · 95 km away
  11. 2.57 km E of East Foothills, California · 14875 days ago · 3 km deep · 52 km away
  12. 1.516 km E of Seven Trees, California · 14874 days ago · 6 km deep · 63 km away
  13. 1.97 km WSW of Gilroy, California · 14874 days ago · 6 km deep · 95 km away
  14. 2.06 km E of East Foothills, California · 14874 days ago · 9 km deep · 50 km away
  15. 1.513 km ESE of Alum Rock, California · 14874 days ago · 2 km deep · 59 km away
  16. 2.69 km ESE of East Foothills, California · 14873 days ago · 8 km deep · 54 km away
  17. 1.78 km ESE of East Foothills, California · 14873 days ago · 8 km deep · 54 km away
  18. 2.13 km ESE of Diablo Grande, California · 14873 days ago · 2 km deep · 70 km away
  19. 2.11 km E of Pacheco, California · 14872 days ago · 21 km deep · 29 km away
  20. 2.713 km N of Morgan Hill, California · 14871 days ago · 5 km deep · 66 km away
  21. 1.714 km N of Morgan Hill, California · 14870 days ago · 6 km deep · 66 km away
  22. 2.014 km N of Morgan Hill, California · 14870 days ago · 3 km deep · 65 km away
  23. 3.79 km E of Gilroy, California · 14869 days ago · 9 km deep · 97 km away
  24. 2.16 km WSW of Gilroy, California · 14869 days ago · 5 km deep · 97 km away
  25. 1.92 km W of Country Club, California · 14868 days ago · 16 km deep · 39 km away
  26. 2.45 km NE of Rohnert Park, California · 14867 days ago · 5 km deep · 96 km away
  27. 1.916 km NE of East Foothills, California · 14866 days ago · 7 km deep · 40 km away
  28. 1.67 km SSW of Sunol, California · 14866 days ago · 6 km deep · 36 km away
  29. 1.87 km NE of Interlaken, California · 14866 days ago · 9 km deep · 94 km away
  30. 1.72 km N of San Martin, California · 14864 days ago · 4 km deep · 82 km away
  31. 1.914 km NNE of East Foothills, California · 14864 days ago · 6 km deep · 39 km away
  32. 2.813 km ESE of Alum Rock, California · 14863 days ago · 7 km deep · 59 km away
  33. 1.614 km E of Seven Trees, California · 14863 days ago · 2 km deep · 61 km away
  34. 1.921 km SW of Diablo Grande, California · 14863 days ago · 4 km deep · 69 km away
  35. 1.511 km S of Pescadero, California · 14863 days ago · 15 km deep · 93 km away
  36. 1.82 km SSW of Morgan Hill, California · 14862 days ago · 16 km deep · 82 km away
  37. 1.64 km WSW of Cupertino, California · 14861 days ago · 5 km deep · 65 km away
  38. 2.06 km NE of East Foothills, California · 14860 days ago · 6 km deep · 47 km away
  39. 2.97 km E of Santa Rosa, California · 14859 days ago · 5 km deep · 99 km away
  40. 1.810 km NW of Moskowite Corner, California · 14859 days ago · 4 km deep · 87 km away
  41. 1.97 km E of Santa Rosa, California · 14859 days ago · 5 km deep · 100 km away
  42. 3.110 km SSE of Green Valley, California · 14859 days ago · 3 km deep · 47 km away
  43. 1.68 km NE of San Martin, California · 14859 days ago · 7 km deep · 82 km away
  44. 1.713 km N of Morgan Hill, California · 14859 days ago · 6 km deep · 66 km away
  45. 1.816 km NW of Davenport, California · 14858 days ago · 3 km deep · 95 km away
  46. 1.610 km NNE of Morgan Hill, California · 14858 days ago · 5 km deep · 71 km away
  47. 2.714 km N of Morgan Hill, California · 14857 days ago · 5 km deep · 65 km away
  48. 2.15 km S of Gilroy, California · 14857 days ago · 5 km deep · 100 km away
  49. 1.72 km NE of Alamo, California · 14857 days ago · 7 km deep · 21 km away
  50. 1.711 km NNE of East Foothills, California · 14856 days ago · 2 km deep · 41 km away
  51. 3.014 km N of Morgan Hill, California · 14854 days ago · 4 km deep · 66 km away
  52. 2.32 km ENE of San Martin, California · 14853 days ago · 4 km deep · 85 km away
  53. 1.610 km SE of Livermore, California · 14851 days ago · 8 km deep · 26 km away
  54. 2.0Northern California · 14851 days ago · 6 km deep · 44 km away
  55. 1.59 km ESE of East Foothills, California · 14850 days ago · 8 km deep · 54 km away
  56. 1.82 km NNE of Ashland, California · 14848 days ago · 5 km deep · 32 km away
  57. 1.89 km ENE of Seven Trees, California · 14848 days ago · 6 km deep · 59 km away
  58. 2.012 km N of Pittsburg, California · 14847 days ago · 16 km deep · 34 km away
  59. 1.53 km NNE of San Ramon, California · 14847 days ago · 12 km deep · 17 km away
  60. 2.17 km NE of Interlaken, California · 14846 days ago · 10 km deep · 94 km away

The first 60 of 111.

Before

  1. 2.03 km N of Pittsburg, California · 14886 days ago · 18 km deep · 26 km away
  2. 2.13 km SSE of Sunol, California · 14886 days ago · 8 km deep · 31 km away
  3. 1.613 km N of Morgan Hill, California · 14887 days ago · 2 km deep · 67 km away
  4. 2.38 km WSW of Pescadero, California · 14887 days ago · 9 km deep · 91 km away
  5. 1.97 km NE of Interlaken, California · 14888 days ago · 10 km deep · 95 km away
  6. 2.50 km W of Pleasant Hill, California · 14889 days ago · 9 km deep · 28 km away
  7. 1.90 km NNW of Concord, California · 14890 days ago · 16 km deep · 27 km away
  8. 2.17 km NE of Interlaken, California · 14890 days ago · 10 km deep · 94 km away
  9. 2.86 km NE of East Foothills, California · 14891 days ago · 4 km deep · 46 km away
  10. 2.59 km NE of San Martin, California · 14891 days ago · 8 km deep · 79 km away
  11. 1.77 km W of Gilroy, California · 14892 days ago · 9 km deep · 94 km away
  12. 1.63 km N of East Foothills, California · 14892 days ago · 0 km deep · 47 km away
  13. 1.616 km E of Seven Trees, California · 14892 days ago · 6 km deep · 63 km away
  14. 1.78 km ENE of Morgan Hill, California · 14893 days ago · 3 km deep · 77 km away
  15. 1.96 km NE of East Foothills, California · 14893 days ago · 4 km deep · 46 km away
  16. 1.96 km NNE of Interlaken, California · 14893 days ago · 11 km deep · 92 km away
  17. 2.17 km NNE of Interlaken, California · 14893 days ago · 10 km deep · 92 km away
  18. 3.46 km NNE of Interlaken, California · 14893 days ago · 12 km deep · 92 km away
  19. 3.06 km NNE of Interlaken, California · 14893 days ago · 11 km deep · 92 km away
  20. 2.05 km NW of Broadmoor, California · 14894 days ago · 6 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc61982. Read Tue, Sep 22, 2026, 8:36 PM UTC.