California earthquakes

M2.3 earthquake 11 km E of Blackhawk, California

A magnitude 2.3 earthquake struck 11 km E of Blackhawk, California on Tue, Feb 7, 1978, 5:09 PM PST (01:09 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.0 4 km ESE 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
2.3 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1978-02-08 01:09:09 UTC
Depth
10.2 km (6.3 mi), shallow
Epicenter
37.817° N, 121.772° 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, 0.4 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
144°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 64 in the 60 days after this one and 31 in the 30 days before it.

After

  1. 3.04 km ESE of Interlaken, California · 17770 days ago · 12 km deep · 98 km away
  2. 1.54 km ESE of Interlaken, California · 17770 days ago · 11 km deep · 98 km away
  3. 2.112 km ESE of Livermore, California · 17769 days ago · 8 km deep · 24 km away
  4. 2.811 km ESE of Livermore, California · 17769 days ago · 8 km deep · 23 km away
  5. 1.611 km ESE of Livermore, California · 17769 days ago · 7 km deep · 23 km away
  6. 2.07 km ENE of Interlaken, California · 17769 days ago · 0 km deep · 94 km away
  7. 1.85 km SW of Gilroy, California · 17765 days ago · 3 km deep · 95 km away
  8. 1.612 km N of Morgan Hill, California · 17764 days ago · 3 km deep · 65 km away
  9. 2.09 km ESE of Black Point-Green Point, California · 17762 days ago · 11 km deep · 64 km away
  10. 2.315 km E of Seven Trees, California · 17762 days ago · 4 km deep · 60 km away
  11. 2.05 km NNW of East Foothills, California · 17761 days ago · 2 km deep · 44 km away
  12. 2.312 km N of Morgan Hill, California · 17761 days ago · 4 km deep · 65 km away
  13. 1.6Northern California · 17759 days ago · 5 km deep · 90 km away
  14. 2.62 km S of Blackhawk, California · 17759 days ago · 8 km deep · 12 km away
  15. 1.71 km W of Cambrian Park, California · 17758 days ago · 8 km deep · 64 km away
  16. 2.44 km N of Morgan Hill, California · 17757 days ago · 6 km deep · 73 km away
  17. 1.84 km N of Morgan Hill, California · 17757 days ago · 5 km deep · 72 km away
  18. 2.27 km S of Livermore, California · 17756 days ago · 8 km deep · 23 km away
  19. 2.216 km N of Morgan Hill, California · 17755 days ago · 6 km deep · 61 km away
  20. 1.6Northern California · 17752 days ago · 2 km deep · 58 km away
  21. 2.31 km NNE of Diablo, California · 17749 days ago · 8 km deep · 16 km away
  22. 1.71 km N of North Gate, California · 17749 days ago · 10 km deep · 23 km away
  23. 2.17 km NE of San Martin, California · 17748 days ago · 1 km deep · 78 km away
  24. 1.59 km ENE of Milpitas, CA · 17747 days ago · 7 km deep · 39 km away
  25. 2.16 km S of Sunol, California · 17745 days ago · 8 km deep · 34 km away
  26. 1.83 km NNE of Dublin, California · 17744 days ago · 8 km deep · 16 km away
  27. 1.63 km NNE of Dublin, California · 17744 days ago · 8 km deep · 16 km away
  28. 1.74 km NNE of Dublin, California · 17742 days ago · 8 km deep · 16 km away
  29. 1.93 km NNE of Dublin, California · 17742 days ago · 8 km deep · 16 km away
  30. 2.0Northern California · 17741 days ago · 6 km deep · 48 km away
  31. 2.37 km SE of Alum Rock, California · 17740 days ago · 3 km deep · 55 km away
  32. 2.57 km NE of Interlaken, California · 17739 days ago · 11 km deep · 92 km away
  33. 2.21 km SE of Highlands-Baywood Park, California · 17738 days ago · 5 km deep · 60 km away
  34. 2.43 km ESE of Lexington Hills, California · 17738 days ago · 12 km deep · 75 km away
  35. 2.010 km ESE of Sunol, California · 17737 days ago · 7 km deep · 29 km away
  36. 1.83 km ESE of Lexington Hills, California · 17737 days ago · 11 km deep · 75 km away
  37. 2.115 km E of Seven Trees, California · 17737 days ago · 6 km deep · 59 km away
  38. 2.321 km NW of Diablo Grande, California · 17736 days ago · 4 km deep · 43 km away
  39. 1.63 km WSW of Dublin, California · 17736 days ago · 6 km deep · 23 km away
  40. 2.53 km S of Diablo, California · 17735 days ago · 8 km deep · 16 km away
  41. 2.03 km W of Glen Ellen, California · 17734 days ago · 9 km deep · 92 km away
  42. 2.69 km SE of Sunol, California · 17733 days ago · 2 km deep · 32 km away
  43. 1.83 km SW of Loyola, California · 17731 days ago · 5 km deep · 63 km away
  44. 1.81 km N of Pittsburg, California · 17731 days ago · 17 km deep · 27 km away
  45. 1.92 km NW of Diablo Grande, California · 17727 days ago · 0 km deep · 61 km away
  46. 2.85 km SW of Gilroy, California · 17726 days ago · 4 km deep · 95 km away
  47. 1.816 km E of Seven Trees, California · 17723 days ago · 6 km deep · 60 km away
  48. 1.618 km E of East Foothills, California · 17723 days ago · 5 km deep · 53 km away
  49. 1.68 km SE of Sunol, California · 17722 days ago · 3 km deep · 32 km away
  50. 2.01 km WNW of Cambrian Park, California · 17721 days ago · 8 km deep · 64 km away
  51. 2.01 km WNW of Cambrian Park, California · 17721 days ago · 8 km deep · 64 km away
  52. 2.54 km ESE of Piedmont, California · 17720 days ago · 9 km deep · 36 km away
  53. 1.62 km S of Fairview, California · 17720 days ago · 6 km deep · 30 km away
  54. 2.12 km ENE of Berkeley, California · 17720 days ago · 9 km deep · 42 km away
  55. 1.92 km ENE of Berkeley, California · 17720 days ago · 9 km deep · 42 km away
  56. 1.57 km NE of Blackhawk, California · 17719 days ago · 12 km deep · 10 km away
  57. 1.85 km ESE of Knightsen, California · 17716 days ago · 0 km deep · 21 km away
  58. 1.8Northern California · 17716 days ago · 5 km deep · 61 km away
  59. 2.71 km NNW of Alamo, California · 17715 days ago · 9 km deep · 24 km away
  60. 2.31 km NNW of Alamo, California · 17715 days ago · 8 km deep · 24 km away

The first 60 of 64.

Before

  1. 1.75 km E of Fremont, California · 17771 days ago · 9 km deep · 33 km away
  2. 1.94 km E of Fremont, California · 17771 days ago · 9 km deep · 33 km away
  3. 2.35 km E of Fremont, California · 17771 days ago · 9 km deep · 33 km away
  4. 2.15 km E of Fremont, California · 17771 days ago · 9 km deep · 33 km away
  5. 2.96 km WSW of Gilroy, California · 17772 days ago · 5 km deep · 94 km away
  6. 2.410 km SW of Brentwood, California · 17774 days ago · 20 km deep · 5 km away
  7. 1.85 km WSW of Gilroy, California · 17776 days ago · 2 km deep · 94 km away
  8. 1.72 km E of North Gate, California · 17776 days ago · 14 km deep · 20 km away
  9. 1.92 km E of North Gate, California · 17776 days ago · 14 km deep · 20 km away
  10. 1.79 km ESE of Gilroy, California · 17779 days ago · 5 km deep · 97 km away
  11. 2.49 km ESE of Gilroy, California · 17780 days ago · 6 km deep · 97 km away
  12. 1.89 km ESE of Gilroy, California · 17780 days ago · 5 km deep · 97 km away
  13. 1.93 km E of Saint Helena, California · 17782 days ago · 11 km deep · 96 km away
  14. 1.58 km NE of Gilroy, California · 17785 days ago · 10 km deep · 88 km away
  15. 1.74 km N of Union City, California · 17787 days ago · 7 km deep · 30 km away
  16. 2.52 km E of North Gate, California · 17787 days ago · 14 km deep · 20 km away
  17. 2.02 km E of North Gate, California · 17787 days ago · 13 km deep · 19 km away
  18. 2.12 km E of North Gate, California · 17787 days ago · 13 km deep · 20 km away
  19. 1.921 km SW of Diablo Grande, California · 17788 days ago · 7 km deep · 64 km away
  20. 2.17 km SSE of Gilroy, California · 17789 days ago · 5 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038873. Read Sun, Oct 4, 2026, 9:31 AM UTC.