California earthquakes

M1.9 earthquake 11 km E of Blackhawk, California

A magnitude 1.9 earthquake struck 11 km E of Blackhawk, California on Tue, Feb 17, 1981, 10:07 PM PST (06:07 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.4 9 km ESE of Gilroy, 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.

Open the live map with earthquakes

The earthquake

Magnitude
1.9 (md), micro
Local time
UTC
1981-02-18 06:07:56 UTC
Depth
10.3 km (6.4 mi), shallow
Epicenter
37.832° N, 121.783° 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, 0.6 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
101°
Stations used
26

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 98 in the 60 days after this one and 56 in the 30 days before it.

After

  1. 2.49 km ESE of Gilroy, California · 16652 days ago · 5 km deep · 98 km away
  2. 1.69 km ESE of East Foothills, California · 16651 days ago · 9 km deep · 53 km away
  3. 1.69 km ESE of Gilroy, California · 16651 days ago · 5 km deep · 98 km away
  4. 2.75 km ENE of East Foothills, California · 16650 days ago · 5 km deep · 48 km away
  5. 1.50 km N of Pleasant Hill, California · 16649 days ago · 7 km deep · 28 km away
  6. 1.75 km SW of Gilroy, California · 16649 days ago · 5 km deep · 97 km away
  7. 2.27 km ENE of San Martin, California · 16648 days ago · 3 km deep · 84 km away
  8. 2.87 km ENE of San Martin, California · 16648 days ago · 3 km deep · 84 km away
  9. 3.17 km ENE of San Martin, California · 16648 days ago · 3 km deep · 84 km away
  10. 1.610 km NE of San Martin, CA · 16648 days ago · 8 km deep · 79 km away
  11. 1.67 km ENE of San Martin, California · 16647 days ago · 3 km deep · 84 km away
  12. 1.58 km ENE of Morgan Hill, California · 16645 days ago · 2 km deep · 77 km away
  13. 2.011 km E of Blackhawk, California · 16645 days ago · 11 km deep · 0 km away
  14. 1.61 km NNW of Pleasant Hill, California · 16643 days ago · 8 km deep · 29 km away
  15. 1.615 km SSE of Livermore, California · 16642 days ago · 2 km deep · 31 km away
  16. 1.615 km SSE of Livermore, California · 16642 days ago · 2 km deep · 31 km away
  17. 1.715 km SSE of Livermore, California · 16642 days ago · 3 km deep · 31 km away
  18. 1.79 km ESE of East Foothills, California · 16642 days ago · 9 km deep · 53 km away
  19. 2.614 km SSE of Livermore, California · 16642 days ago · 2 km deep · 31 km away
  20. 1.64 km NE of Interlaken, California · 16642 days ago · 12 km deep · 95 km away
  21. 2.04 km NE of Interlaken, California · 16642 days ago · 12 km deep · 95 km away
  22. 1.712 km N of Morgan Hill, California · 16641 days ago · 7 km deep · 66 km away
  23. 1.82 km SW of Moskowite Corner, California · 16640 days ago · 8 km deep · 76 km away
  24. 2.34 km E of Fremont, California · 16639 days ago · 10 km deep · 34 km away
  25. 4.45 km E of Fremont, California · 16639 days ago · 12 km deep · 34 km away
  26. 2.25 km E of Fremont, California · 16639 days ago · 10 km deep · 34 km away
  27. 2.15 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  28. 3.05 km E of Fremont, California · 16639 days ago · 11 km deep · 34 km away
  29. 1.74 km E of Fremont, California · 16639 days ago · 8 km deep · 34 km away
  30. 1.65 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  31. 2.45 km E of Fremont, California · 16639 days ago · 9 km deep · 35 km away
  32. 1.64 km E of Fremont, California · 16639 days ago · 14 km deep · 34 km away
  33. 1.65 km E of Fremont, California · 16639 days ago · 6 km deep · 35 km away
  34. 1.86 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  35. 2.15 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  36. 1.75 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  37. 1.85 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  38. 1.73 km E of Fremont, California · 16639 days ago · 8 km deep · 34 km away
  39. 2.05 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  40. 1.74 km E of Fremont, California · 16639 days ago · 9 km deep · 34 km away
  41. 1.65 km E of Fremont, California · 16639 days ago · 10 km deep · 34 km away
  42. 1.84 km E of Fremont, California · 16639 days ago · 9 km deep · 35 km away
  43. 1.85 km SSW of Sunol, California · 16639 days ago · 11 km deep · 34 km away
  44. 2.39 km NNE of Livermore, California · 16639 days ago · 13 km deep · 10 km away
  45. 1.64 km E of Fremont, California · 16639 days ago · 8 km deep · 35 km away
  46. 1.94 km E of Fremont, California · 16639 days ago · 10 km deep · 34 km away
  47. 1.85 km E of Fremont, California · 16638 days ago · 10 km deep · 34 km away
  48. 1.66 km ENE of East Foothills, California · 16638 days ago · 4 km deep · 47 km away
  49. 1.78 km NE of Gilroy, California · 16638 days ago · 4 km deep · 90 km away
  50. 1.62 km ENE of Pacheco, California · 16637 days ago · 15 km deep · 30 km away
  51. 1.79 km E of San Martin, California · 16637 days ago · 8 km deep · 87 km away
  52. 1.64 km E of Fremont, California · 16636 days ago · 8 km deep · 34 km away
  53. 2.714 km E of Seven Trees, California · 16634 days ago · 7 km deep · 59 km away
  54. 1.82 km SSW of Pittsburg, California · 16633 days ago · 18 km deep · 22 km away
  55. 1.75 km E of Fremont, California · 16629 days ago · 5 km deep · 34 km away
  56. 1.813 km N of Morgan Hill, California · 16629 days ago · 6 km deep · 66 km away
  57. 1.75 km E of Fremont, California · 16629 days ago · 9 km deep · 34 km away
  58. 1.68 km ENE of Gilroy, California · 16628 days ago · 7 km deep · 91 km away
  59. 2.17 km NNE of Milpitas, California · 16628 days ago · 0 km deep · 39 km away
  60. 1.69 km ESE of East Foothills, California · 16628 days ago · 8 km deep · 53 km away

The first 60 of 98.

Before

  1. 2.3Northern California · 16653 days ago · 8 km deep · 45 km away
  2. 1.712 km ESE of Livermore, California · 16654 days ago · 8 km deep · 25 km away
  3. 2.19 km SSE of Sunol, California · 16655 days ago · 9 km deep · 36 km away
  4. 1.73 km SW of San Bruno, California · 16655 days ago · 8 km deep · 63 km away
  5. 1.52 km WSW of Cupertino, California · 16656 days ago · 4 km deep · 63 km away
  6. 2.77 km ENE of San Martin, California · 16656 days ago · 3 km deep · 84 km away
  7. 2.16 km WNW of Broadmoor, California · 16657 days ago · 4 km deep · 68 km away
  8. 2.315 km SSE of Livermore, California · 16659 days ago · 1 km deep · 31 km away
  9. 3.09 km SW of Brentwood, California · 16660 days ago · 17 km deep · 4 km away
  10. 2.60 km SSE of North Gate, California · 16660 days ago · 11 km deep · 20 km away
  11. 1.75 km SSE of Herald, California · 16660 days ago · 0 km deep · 67 km away
  12. 2.39 km NE of San Martin, California · 16661 days ago · 8 km deep · 80 km away
  13. 2.11 km NE of San Leandro, California · 16662 days ago · 6 km deep · 33 km away
  14. 2.07 km NNE of Pittsburg, California · 16662 days ago · 17 km deep · 29 km away
  15. 1.811 km SW of Brentwood, California · 16663 days ago · 14 km deep · 2 km away
  16. 1.59 km ESE of East Foothills, California · 16663 days ago · 8 km deep · 53 km away
  17. 1.96 km SW of Monte Sereno, California · 16664 days ago · 10 km deep · 74 km away
  18. 2.5Northern California · 16664 days ago · 10 km deep · 74 km away
  19. 1.83 km S of Communications Hill, California · 16664 days ago · 5 km deep · 64 km away
  20. 1.69 km NNE of Livermore, California · 16665 days ago · 12 km deep · 10 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1060500. Read Tue, Sep 22, 2026, 9:35 PM UTC.