California earthquakes

M1.5 earthquake 11 km E of Blackhawk, California

A magnitude 1.5 earthquake struck 11 km E of Blackhawk, California on Mon, Feb 2, 1981, 9:34 AM PST (17:34 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M1.5 4 km NNE of Morgan Hill, 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
1.5 (md), micro
Local time
UTC
1981-02-02 17:34:25 UTC
Depth
5.2 km (3.2 mi), shallow
Epicenter
37.839° N, 121.779° 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, 0.3 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
106°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 108 in the 60 days after this one and 57 in the 30 days before it.

After

  1. 1.54 km NNE of Morgan Hill, California · 16667 days ago · 5 km deep · 76 km away
  2. 1.57 km E of East Foothills, California · 16665 days ago · 9 km deep · 50 km away
  3. 1.67 km E of East Foothills, California · 16665 days ago · 9 km deep · 50 km away
  4. 1.67 km E of East Foothills, California · 16665 days ago · 9 km deep · 50 km away
  5. 1.69 km NNE of Livermore, California · 16665 days ago · 12 km deep · 11 km away
  6. 1.83 km S of Communications Hill, California · 16664 days ago · 5 km deep · 65 km away
  7. 2.5Northern California · 16664 days ago · 10 km deep · 75 km away
  8. 1.96 km SW of Monte Sereno, California · 16664 days ago · 10 km deep · 75 km away
  9. 1.59 km ESE of East Foothills, California · 16663 days ago · 8 km deep · 54 km away
  10. 1.811 km SW of Brentwood, California · 16662 days ago · 14 km deep · 2 km away
  11. 2.07 km NNE of Pittsburg, California · 16662 days ago · 17 km deep · 29 km away
  12. 2.11 km NE of San Leandro, California · 16662 days ago · 6 km deep · 34 km away
  13. 2.39 km NE of San Martin, California · 16661 days ago · 8 km deep · 80 km away
  14. 1.75 km SSE of Herald, California · 16660 days ago · 0 km deep · 67 km away
  15. 2.60 km SSE of North Gate, California · 16660 days ago · 11 km deep · 20 km away
  16. 3.09 km SW of Brentwood, California · 16659 days ago · 17 km deep · 4 km away
  17. 2.315 km SSE of Livermore, California · 16659 days ago · 1 km deep · 32 km away
  18. 2.16 km WNW of Broadmoor, California · 16657 days ago · 4 km deep · 69 km away
  19. 2.77 km ENE of San Martin, California · 16656 days ago · 3 km deep · 84 km away
  20. 1.52 km WSW of Cupertino, California · 16656 days ago · 4 km deep · 63 km away
  21. 1.73 km SW of San Bruno, California · 16655 days ago · 8 km deep · 63 km away
  22. 2.19 km SSE of Sunol, California · 16654 days ago · 9 km deep · 37 km away
  23. 1.712 km ESE of Livermore, California · 16653 days ago · 8 km deep · 26 km away
  24. 2.3Northern California · 16653 days ago · 8 km deep · 45 km away
  25. 1.911 km E of Blackhawk, California · 16652 days ago · 10 km deep · 1 km away
  26. 2.49 km ESE of Gilroy, California · 16651 days ago · 5 km deep · 99 km away
  27. 1.69 km ESE of East Foothills, California · 16651 days ago · 9 km deep · 54 km away
  28. 1.69 km ESE of Gilroy, California · 16651 days ago · 5 km deep · 99 km away
  29. 2.75 km ENE of East Foothills, California · 16650 days ago · 5 km deep · 48 km away
  30. 1.50 km N of Pleasant Hill, California · 16649 days ago · 7 km deep · 28 km away
  31. 1.75 km SW of Gilroy, California · 16649 days ago · 5 km deep · 98 km away
  32. 2.27 km ENE of San Martin, California · 16648 days ago · 3 km deep · 84 km away
  33. 2.87 km ENE of San Martin, California · 16648 days ago · 3 km deep · 84 km away
  34. 3.17 km ENE of San Martin, California · 16648 days ago · 3 km deep · 84 km away
  35. 1.610 km NE of San Martin, CA · 16647 days ago · 8 km deep · 80 km away
  36. 1.67 km ENE of San Martin, California · 16647 days ago · 3 km deep · 85 km away
  37. 1.58 km ENE of Morgan Hill, California · 16645 days ago · 2 km deep · 77 km away
  38. 2.011 km E of Blackhawk, California · 16644 days ago · 11 km deep · 1 km away
  39. 1.61 km NNW of Pleasant Hill, California · 16642 days ago · 8 km deep · 29 km away
  40. 1.615 km SSE of Livermore, California · 16642 days ago · 2 km deep · 32 km away
  41. 1.615 km SSE of Livermore, California · 16642 days ago · 2 km deep · 32 km away
  42. 1.715 km SSE of Livermore, California · 16642 days ago · 3 km deep · 32 km away
  43. 1.79 km ESE of East Foothills, California · 16641 days ago · 9 km deep · 54 km away
  44. 2.614 km SSE of Livermore, California · 16641 days ago · 2 km deep · 31 km away
  45. 1.64 km NE of Interlaken, California · 16641 days ago · 12 km deep · 96 km away
  46. 2.04 km NE of Interlaken, California · 16641 days ago · 12 km deep · 96 km away
  47. 1.712 km N of Morgan Hill, California · 16641 days ago · 7 km deep · 67 km away
  48. 1.82 km SW of Moskowite Corner, California · 16640 days ago · 8 km deep · 76 km away
  49. 2.34 km E of Fremont, California · 16639 days ago · 10 km deep · 35 km away
  50. 4.45 km E of Fremont, California · 16639 days ago · 12 km deep · 35 km away
  51. 2.25 km E of Fremont, California · 16639 days ago · 10 km deep · 35 km away
  52. 2.15 km E of Fremont, California · 16639 days ago · 9 km deep · 35 km away
  53. 3.05 km E of Fremont, California · 16639 days ago · 11 km deep · 35 km away
  54. 1.74 km E of Fremont, California · 16639 days ago · 8 km deep · 35 km away
  55. 1.65 km E of Fremont, California · 16639 days ago · 9 km deep · 35 km away
  56. 2.45 km E of Fremont, California · 16639 days ago · 9 km deep · 35 km away
  57. 1.64 km E of Fremont, California · 16639 days ago · 14 km deep · 35 km away
  58. 1.65 km E of Fremont, California · 16639 days ago · 6 km deep · 35 km away
  59. 1.86 km E of Fremont, California · 16639 days ago · 9 km deep · 35 km away
  60. 2.15 km E of Fremont, California · 16639 days ago · 9 km deep · 35 km away

The first 60 of 108.

Before

  1. 2.4Central California · 16668 days ago · 3 km deep · 98 km away
  2. 1.915 km SSE of Livermore, California · 16669 days ago · 3 km deep · 32 km away
  3. 2.010 km SW of Brentwood, California · 16670 days ago · 14 km deep · 2 km away
  4. 1.79 km SW of Ripon, California · 16670 days ago · 5 km deep · 53 km away
  5. 3.49 km ENE of Morgan Hill, California · 16670 days ago · 6 km deep · 78 km away
  6. 2.49 km ENE of Morgan Hill, California · 16671 days ago · 5 km deep · 77 km away
  7. 1.79 km ENE of Morgan Hill, California · 16671 days ago · 6 km deep · 78 km away
  8. 1.69 km NNE of Morgan Hill, California · 16673 days ago · 4 km deep · 73 km away
  9. 2.116 km E of East Foothills, California · 16674 days ago · 7 km deep · 51 km away
  10. 1.86 km E of San Martin, California · 16675 days ago · 5 km deep · 85 km away
  11. 2.06 km ENE of San Martin, California · 16675 days ago · 5 km deep · 85 km away
  12. 1.58 km ENE of Gilroy, California · 16675 days ago · 6 km deep · 92 km away
  13. 1.72 km N of Ashland, California · 16675 days ago · 6 km deep · 32 km away
  14. 1.610 km ENE of Seven Trees, California · 16675 days ago · 3 km deep · 59 km away
  15. 2.61 km N of Pleasant Hill, California · 16676 days ago · 9 km deep · 28 km away
  16. 1.83 km SW of Muir Beach, California · 16676 days ago · 2 km deep · 73 km away
  17. 2.014 km SSE of Livermore, California · 16676 days ago · 2 km deep · 32 km away
  18. 1.810 km SW of Brentwood, California · 16677 days ago · 14 km deep · 2 km away
  19. 1.92 km N of Monte Sereno, California · 16677 days ago · 4 km deep · 68 km away
  20. 1.66 km NNE of Interlaken, California · 16677 days ago · 7 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1059913. Read Tue, Sep 22, 2026, 3:55 PM UTC.