California earthquakes

M1.8 earthquake 10 km ENE of Blackhawk, California

A magnitude 1.8 earthquake struck 10 km ENE of Blackhawk, California on Wed, Sep 25, 1985, 4:49 PM PDT (23:49 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M1.9 16 km E of Seven Trees, 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
1.8 (md), micro
Local time
UTC
1985-09-25 23:49:26 UTC
Depth
11.1 km (6.9 mi), shallow
Epicenter
37.840° N, 121.789° 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 0.4 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
101°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 76 in the 60 days after this one and 47 in the 30 days before it.

After

  1. 1.64 km ESE of Moskowite Corner, California · 14970 days ago · 5 km deep · 72 km away
  2. 1.62 km E of Rodeo, California · 14970 days ago · 4 km deep · 45 km away
  3. 1.916 km E of Seven Trees, California · 14970 days ago · 6 km deep · 64 km away
  4. 1.616 km E of Seven Trees, California · 14970 days ago · 5 km deep · 64 km away
  5. 2.84 km NE of San Leandro, California · 14969 days ago · 11 km deep · 30 km away
  6. 1.76 km NE of East Foothills, California · 14968 days ago · 9 km deep · 46 km away
  7. 2.07 km NNE of Interlaken, California · 14968 days ago · 7 km deep · 92 km away
  8. 1.615 km N of Morgan Hill, California · 14967 days ago · 8 km deep · 65 km away
  9. 2.813 km N of Morgan Hill, California · 14967 days ago · 4 km deep · 67 km away
  10. 1.511 km SSW of Brentwood, California · 14965 days ago · 12 km deep · 2 km away
  11. 1.68 km NE of San Martin, California · 14963 days ago · 6 km deep · 81 km away
  12. 1.711 km NW of Moskowite Corner, California · 14963 days ago · 4 km deep · 86 km away
  13. 1.716 km NE of East Foothills, California · 14962 days ago · 8 km deep · 41 km away
  14. 1.86 km SSE of Moskowite Corner, California · 14962 days ago · 5 km deep · 70 km away
  15. 3.07 km N of Interlaken, California · 14962 days ago · 8 km deep · 91 km away
  16. 1.68 km NNE of Interlaken, California · 14962 days ago · 8 km deep · 91 km away
  17. 2.312 km N of Morgan Hill, California · 14961 days ago · 3 km deep · 67 km away
  18. 1.712 km WSW of Byron, California · 14960 days ago · 10 km deep · 5 km away
  19. 3.013 km N of Morgan Hill, California · 14960 days ago · 5 km deep · 67 km away
  20. 2.89 km NE of Gilroy, California · 14960 days ago · 9 km deep · 92 km away
  21. 1.83 km N of Ashland, California · 14959 days ago · 4 km deep · 32 km away
  22. 2.216 km NE of East Foothills, California · 14958 days ago · 8 km deep · 42 km away
  23. 1.88 km ENE of Morgan Hill, California · 14957 days ago · 2 km deep · 79 km away
  24. 2.67 km WSW of Glen Ellen, California · 14956 days ago · 8 km deep · 89 km away
  25. 1.77 km NNE of San Martin, California · 14956 days ago · 4 km deep · 80 km away
  26. 1.615 km WNW of Davenport, California · 14956 days ago · 6 km deep · 100 km away
  27. 1.80 km WSW of Concord, California · 14955 days ago · 19 km deep · 26 km away
  28. 1.516 km E of Seven Trees, California · 14953 days ago · 6 km deep · 64 km away
  29. 1.73 km N of Piedmont, California · 14951 days ago · 12 km deep · 39 km away
  30. 1.88 km ENE of Morgan Hill, California · 14950 days ago · 1 km deep · 79 km away
  31. 1.814 km E of Seven Trees, California · 14948 days ago · 3 km deep · 62 km away
  32. 1.93 km ESE of Berkeley, California · 14948 days ago · 7 km deep · 40 km away
  33. 1.59 km NNE of San Martin, California · 14946 days ago · 5 km deep · 79 km away
  34. 1.711 km S of Pescadero, California · 14944 days ago · 15 km deep · 93 km away
  35. 2.65 km E of Rohnert Park, California · 14944 days ago · 7 km deep · 93 km away
  36. 2.52 km W of Concord, California · 14942 days ago · 13 km deep · 28 km away
  37. 2.114 km N of Morgan Hill, California · 14940 days ago · 3 km deep · 65 km away
  38. 1.64 km SSW of Lexington Hills, California · 14940 days ago · 0 km deep · 81 km away
  39. 1.68 km NNE of East Foothills, California · 14939 days ago · 9 km deep · 43 km away
  40. 1.612 km E of East Foothills, California · 14937 days ago · 5 km deep · 53 km away
  41. 2.115 km E of Seven Trees, California · 14936 days ago · 5 km deep · 62 km away
  42. 1.615 km E of Seven Trees, California · 14936 days ago · 5 km deep · 62 km away
  43. 2.47 km NE of Interlaken, California · 14935 days ago · 10 km deep · 95 km away
  44. 2.012 km ESE of East Foothills, California · 14933 days ago · 6 km deep · 58 km away
  45. 2.413 km N of Morgan Hill, California · 14933 days ago · 3 km deep · 67 km away
  46. 1.914 km E of Seven Trees, California · 14932 days ago · 5 km deep · 61 km away
  47. 3.011 km ESE of East Foothills, California · 14931 days ago · 8 km deep · 57 km away
  48. 1.613 km N of Morgan Hill, California · 14931 days ago · 3 km deep · 67 km away
  49. 1.87 km SSE of Livermore, California · 14929 days ago · 1 km deep · 25 km away
  50. 1.57 km ENE of Penngrove, California · 14929 days ago · 8 km deep · 89 km away
  51. 2.23 km WSW of Green Valley, California · 14929 days ago · 7 km deep · 57 km away
  52. 1.91 km ENE of Green Valley, California · 14929 days ago · 12 km deep · 56 km away
  53. 1.915 km E of Seven Trees, California · 14927 days ago · 6 km deep · 62 km away
  54. 2.115 km ESE of Suisun, California · 14926 days ago · 11 km deep · 39 km away
  55. 1.712 km SSE of Livermore, California · 14926 days ago · 7 km deep · 30 km away
  56. 1.56 km WSW of Gilroy, California · 14925 days ago · 3 km deep · 97 km away
  57. 1.714 km E of Seven Trees, California · 14925 days ago · 2 km deep · 62 km away
  58. 2.18 km NE of Milpitas, California · 14925 days ago · 7 km deep · 41 km away
  59. 1.914 km E of Seven Trees, California · 14924 days ago · 3 km deep · 61 km away
  60. 1.914 km E of Angwin, California · 14923 days ago · 1 km deep · 94 km away

The first 60 of 76.

Before

  1. 2.52 km E of Moskowite Corner, California · 14972 days ago · 4 km deep · 75 km away
  2. 1.82 km E of North Gate, California · 14972 days ago · 12 km deep · 18 km away
  3. 2.05 km S of Moskowite Corner, California · 14973 days ago · 8 km deep · 72 km away
  4. 1.816 km NE of East Foothills, California · 14973 days ago · 8 km deep · 41 km away
  5. 1.611 km SW of Brentwood, California · 14973 days ago · 15 km deep · 1 km away
  6. 2.5Northern California · 14974 days ago · 8 km deep · 41 km away
  7. 3.516 km NE of East Foothills, California · 14974 days ago · 9 km deep · 40 km away
  8. 1.516 km NE of East Foothills, California · 14974 days ago · 8 km deep · 40 km away
  9. 1.611 km SW of Brentwood, California · 14976 days ago · 11 km deep · 1 km away
  10. 1.9Northern California · 14976 days ago · 3 km deep · 35 km away
  11. 2.58 km NE of San Martin, California · 14977 days ago · 7 km deep · 82 km away
  12. 1.69 km NNE of Morgan Hill, California · 14978 days ago · 4 km deep · 73 km away
  13. 1.910 km NNW of Moskowite Corner, California · 14981 days ago · 9 km deep · 86 km away
  14. 1.79 km NE of Gilroy, California · 14983 days ago · 8 km deep · 91 km away
  15. 2.213 km N of Morgan Hill, California · 14985 days ago · 5 km deep · 67 km away
  16. 1.9Northern California · 14985 days ago · 4 km deep · 41 km away
  17. 1.7Northern California · 14985 days ago · 7 km deep · 32 km away
  18. 1.93 km WSW of Glen Ellen, California · 14985 days ago · 8 km deep · 89 km away
  19. 2.13 km W of Glen Ellen, California · 14985 days ago · 8 km deep · 89 km away
  20. 1.82 km WSW of Taft Mosswood, California · 14986 days ago · 15 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc55816. Read Tue, Sep 22, 2026, 9:19 PM UTC.