California earthquakes

M2.3 earthquake 5 km E of Blackhawk, California

A magnitude 2.3 earthquake struck 5 km E of Blackhawk, California on Sun, Jun 4, 1978, 5:14 PM PDT (00:14 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.2 8 km NE 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), micro
Local time
UTC
1978-06-05 00:14:14 UTC
Depth
4.7 km (3.0 mi), shallow
Epicenter
37.813° N, 121.846° 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, 0.3 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
71°
Stations used
43

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 50 in the 60 days after this one and 58 in the 30 days before it.

After

  1. 1.85 km WSW of Gilroy, California · 17648 days ago · 7 km deep · 94 km away
  2. 2.310 km SW of Suisun, California · 17646 days ago · 6 km deep · 45 km away
  3. 3.05 km E of East Foothills, California · 17644 days ago · 0 km deep · 50 km away
  4. 1.96 km NNW of Day Valley, California · 17644 days ago · 11 km deep · 81 km away
  5. 1.96 km WSW of Gilroy, California · 17641 days ago · 4 km deep · 94 km away
  6. 1.89 km ESE of Gilroy, California · 17639 days ago · 3 km deep · 99 km away
  7. 2.22 km ENE of Berkeley, California · 17638 days ago · 10 km deep · 36 km away
  8. 1.813 km NE of East Foothills, California · 17637 days ago · 8 km deep · 38 km away
  9. 2.613 km NE of East Foothills, California · 17637 days ago · 8 km deep · 39 km away
  10. 2.56 km ESE of Sunol, California · 17636 days ago · 11 km deep · 26 km away
  11. 1.611 km NW of Moskowite Corner, California · 17635 days ago · 16 km deep · 88 km away
  12. 1.70 km SW of Fairview, California · 17634 days ago · 8 km deep · 24 km away
  13. 1.73 km S of Diablo, California · 17632 days ago · 9 km deep · 10 km away
  14. 1.611 km ESE of Livermore, California · 17631 days ago · 8 km deep · 26 km away
  15. 1.912 km S of Pescadero, California · 17628 days ago · 14 km deep · 89 km away
  16. 1.74 km SSW of Gilroy, California · 17626 days ago · 4 km deep · 97 km away
  17. 1.62 km SSE of Portola Valley, California · 17626 days ago · 9 km deep · 60 km away
  18. 1.514 km E of Seven Trees, California · 17626 days ago · 2 km deep · 60 km away
  19. 2.11 km WNW of Moskowite Corner, California · 17622 days ago · 12 km deep · 77 km away
  20. 1.712 km ESE of East Foothills, California · 17620 days ago · 4 km deep · 56 km away
  21. 2.16 km NE of Inverness, California · 17616 days ago · 0 km deep · 91 km away
  22. 2.51 km SE of San Ramon, California · 17615 days ago · 7 km deep · 12 km away
  23. 1.817 km E of East Foothills, California · 17614 days ago · 6 km deep · 54 km away
  24. 1.714 km E of Seven Trees, California · 17614 days ago · 2 km deep · 60 km away
  25. 2.43 km N of East Foothills, California · 17613 days ago · 0 km deep · 44 km away
  26. 2.94 km N of East Foothills, California · 17613 days ago · 1 km deep · 44 km away
  27. 1.74 km N of East Foothills, California · 17613 days ago · 1 km deep · 44 km away
  28. 2.011 km SE of Livermore, California · 17612 days ago · 3 km deep · 27 km away
  29. 1.511 km NE of East Foothills, California · 17612 days ago · 1 km deep · 42 km away
  30. 2.33 km SW of Oakville, California · 17609 days ago · 9 km deep · 84 km away
  31. 2.02 km W of Cambrian Park, California · 17607 days ago · 7 km deep · 62 km away
  32. 2.65 km WSW of Gilroy, California · 17607 days ago · 6 km deep · 95 km away
  33. 1.92 km SSW of Cambrian Park, California · 17606 days ago · 5 km deep · 65 km away
  34. 3.28 km NE of Interlaken, California · 17606 days ago · 5 km deep · 91 km away
  35. 1.711 km ESE of Seven Trees, California · 17605 days ago · 4 km deep · 63 km away
  36. 2.17 km NE of Inverness, California · 17604 days ago · 1 km deep · 91 km away
  37. 2.23 km ENE of San Leandro, California · 17604 days ago · 8 km deep · 26 km away
  38. 2.413 km N of Morgan Hill, California · 17604 days ago · 5 km deep · 65 km away
  39. 2.22 km SW of West Menlo Park, California · 17601 days ago · 6 km deep · 55 km away
  40. 1.75 km ESE of San Ramon, California · 17601 days ago · 7 km deep · 9 km away
  41. 2.08 km ENE of San Martin, California · 17598 days ago · 7 km deep · 82 km away
  42. 2.63 km NNE of Castro Valley, California · 17597 days ago · 10 km deep · 22 km away
  43. 3.03 km NNE of Castro Valley, California · 17597 days ago · 11 km deep · 22 km away
  44. 2.13 km NNE of Castro Valley, California · 17597 days ago · 10 km deep · 22 km away
  45. 1.81 km NNE of Inverness, California · 17595 days ago · 5 km deep · 94 km away
  46. 2.11 km NNE of Diablo, California · 17595 days ago · 7 km deep · 10 km away
  47. 3.03 km E of San Leandro, California · 17593 days ago · 10 km deep · 26 km away
  48. 2.13 km E of San Leandro, California · 17593 days ago · 9 km deep · 26 km away
  49. 2.02 km E of San Leandro, California · 17593 days ago · 10 km deep · 26 km away
  50. 2.03 km E of San Leandro, California · 17591 days ago · 9 km deep · 26 km away

Before

  1. 1.52 km N of Deer Park, California · 17654 days ago · 13 km deep · 99 km away
  2. 1.6Northern California · 17656 days ago · 1 km deep · 59 km away
  3. 2.26 km ESE of Sunol, California · 17656 days ago · 11 km deep · 26 km away
  4. 1.64 km E of East Foothills, California · 17659 days ago · 0 km deep · 48 km away
  5. 2.06 km E of East Foothills, California · 17660 days ago · 0 km deep · 50 km away
  6. 1.58 km E of Gilroy, California · 17661 days ago · 4 km deep · 95 km away
  7. 1.94 km E of East Foothills, California · 17662 days ago · 0 km deep · 48 km away
  8. 1.94 km E of San Ramon, California · 17662 days ago · 4 km deep · 8 km away
  9. 2.22 km WSW of Green Valley, California · 17662 days ago · 6 km deep · 56 km away
  10. 2.12 km WSW of Green Valley, California · 17664 days ago · 0 km deep · 57 km away
  11. 1.95 km E of East Foothills, California · 17665 days ago · 0 km deep · 49 km away
  12. 1.85 km ESE of East Foothills, California · 17665 days ago · 0 km deep · 50 km away
  13. 1.912 km ESE of East Foothills, California · 17665 days ago · 6 km deep · 56 km away
  14. 1.76 km ESE of East Foothills, California · 17666 days ago · 0 km deep · 50 km away
  15. 1.94 km E of East Foothills, California · 17669 days ago · 0 km deep · 49 km away
  16. 1.85 km ESE of East Foothills, California · 17669 days ago · 0 km deep · 50 km away
  17. 2.08 km NNE of Milpitas, California · 17670 days ago · 4 km deep · 34 km away
  18. 2.15 km E of East Foothills, California · 17670 days ago · 0 km deep · 50 km away
  19. 2.35 km E of East Foothills, California · 17670 days ago · 0 km deep · 50 km away
  20. 1.66 km E of East Foothills, California · 17673 days ago · 0 km deep · 50 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1040549. Read Wed, Sep 30, 2026, 7:02 AM UTC.