California earthquakes

M2.1 earthquake 11 km E of Blackhawk, California

A magnitude 2.1 earthquake struck 11 km E of Blackhawk, California on Thu, Aug 27, 1981, 4:10 AM PDT (11:10 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M3.0 9 km NE of San Martin, 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
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1981-08-27 11:10:40 UTC
Depth
14.2 km (8.8 mi), shallow
Epicenter
37.834° 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 0.2 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
104°
Stations used
39

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 65 in the 60 days after this one and 42 in the 30 days before it.

After

  1. 2.37 km E of East Foothills, California · 16470 days ago · 6 km deep · 52 km away
  2. 1.89 km ENE of Gilroy, California · 16469 days ago · 9 km deep · 92 km away
  3. 2.12 km E of San Leandro, California · 16469 days ago · 5 km deep · 33 km away
  4. 2.412 km N of Livermore, California · 16468 days ago · 12 km deep · 5 km away
  5. 1.65 km E of Fremont, California · 16466 days ago · 9 km deep · 35 km away
  6. 2.06 km S of Sunol, California · 16466 days ago · 9 km deep · 35 km away
  7. 1.74 km N of Milpitas, California · 16465 days ago · 3 km deep · 42 km away
  8. 1.65 km E of Fremont, California · 16465 days ago · 10 km deep · 34 km away
  9. 1.518 km ESE of East Foothills, California · 16464 days ago · 1 km deep · 60 km away
  10. 1.611 km ENE of Milpitas, California · 16464 days ago · 4 km deep · 39 km away
  11. 1.89 km E of San Martin, California · 16461 days ago · 9 km deep · 88 km away
  12. 1.611 km SSW of Loyola, California · 16461 days ago · 10 km deep · 72 km away
  13. 2.19 km ENE of Morgan Hill, California · 16459 days ago · 6 km deep · 78 km away
  14. 1.61 km WSW of Belmont, California · 16456 days ago · 3 km deep · 57 km away
  15. 3.09 km NE of San Martin, California · 16455 days ago · 8 km deep · 79 km away
  16. 2.67 km W of Gilroy, California · 16454 days ago · 4 km deep · 94 km away
  17. 2.011 km SSW of Loyola, California · 16453 days ago · 9 km deep · 72 km away
  18. 1.615 km N of Morgan Hill, California · 16451 days ago · 6 km deep · 64 km away
  19. 1.615 km N of Morgan Hill, California · 16451 days ago · 6 km deep · 64 km away
  20. 1.75 km WNW of Broadmoor, California · 16450 days ago · 4 km deep · 68 km away
  21. 1.714 km E of Seven Trees, California · 16449 days ago · 4 km deep · 61 km away
  22. 1.521 km ENE of East Foothills, California · 16447 days ago · 6 km deep · 43 km away
  23. 2.19 km ESE of East Foothills, California · 16447 days ago · 5 km deep · 54 km away
  24. 1.714 km NNW of Moskowite Corner, California · 16445 days ago · 0 km deep · 92 km away
  25. 1.82 km NNE of Woodside, California · 16445 days ago · 5 km deep · 59 km away
  26. 1.720 km W of Volta, California · 16444 days ago · 0 km deep · 99 km away
  27. 1.88 km ENE of Blackhawk, California · 16444 days ago · 14 km deep · 4 km away
  28. 1.85 km E of Fremont, California · 16441 days ago · 9 km deep · 35 km away
  29. 1.75 km SSW of Gilroy, California · 16441 days ago · 4 km deep · 98 km away
  30. 2.39 km ESE of East Foothills, California · 16441 days ago · 8 km deep · 54 km away
  31. 2.49 km NE of Gilroy, California · 16440 days ago · 9 km deep · 89 km away
  32. 2.93 km ESE of Brentwood, California · 16436 days ago · 9 km deep · 15 km away
  33. 1.73 km SSW of Oakville, California · 16435 days ago · 6 km deep · 85 km away
  34. 1.54 km SSE of Diablo Grande, California · 16434 days ago · 8 km deep · 69 km away
  35. 1.89 km NE of Milpitas, California · 16434 days ago · 7 km deep · 37 km away
  36. 2.322 km SE of Livermore, California · 16432 days ago · 7 km deep · 36 km away
  37. 2.31 km NNE of Pacifica, California · 16432 days ago · 7 km deep · 66 km away
  38. 1.86 km SE of Lexington Hills, California · 16431 days ago · 13 km deep · 79 km away
  39. 1.81 km NNE of Pacifica, California · 16431 days ago · 7 km deep · 66 km away
  40. 2.110 km SSW of Tracy, California · 16431 days ago · 9 km deep · 35 km away
  41. 1.66 km SW of Gilroy, California · 16429 days ago · 5 km deep · 97 km away
  42. 1.76 km NE of East Foothills, California · 16429 days ago · 8 km deep · 46 km away
  43. 2.15 km NNE of San Leandro, California · 16428 days ago · 11 km deep · 32 km away
  44. 1.715 km WNW of Davenport, California · 16428 days ago · 4 km deep · 96 km away
  45. 1.84 km WSW of Kenwood, California · 16428 days ago · 8 km deep · 96 km away
  46. 1.717 km N of Moskowite Corner, California · 16426 days ago · 8 km deep · 93 km away
  47. 2.014 km N of Moskowite Corner, California · 16425 days ago · 0 km deep · 90 km away
  48. 2.19 km ESE of East Foothills, California · 16425 days ago · 7 km deep · 54 km away
  49. 1.610 km ESE of Gilroy, California · 16423 days ago · 5 km deep · 100 km away
  50. 2.010 km N of Pittsburg, California · 16422 days ago · 21 km deep · 33 km away
  51. 1.510 km ESE of Gilroy, California · 16421 days ago · 5 km deep · 100 km away
  52. 2.03 km SSE of Brentwood, California · 16420 days ago · 2 km deep · 12 km away
  53. 2.714 km E of Seven Trees, California · 16416 days ago · 7 km deep · 59 km away
  54. 1.99 km NE of Gilroy, California · 16415 days ago · 8 km deep · 89 km away
  55. 1.72 km NE of San Leandro, California · 16415 days ago · 3 km deep · 33 km away
  56. 1.87 km SSW of Pescadero, California · 16414 days ago · 14 km deep · 90 km away
  57. 1.715 km NE of Morgan Hill, California · 16414 days ago · 7 km deep · 70 km away
  58. 2.310 km ESE of East Foothills, California · 16414 days ago · 8 km deep · 55 km away
  59. 2.710 km ESE of East Foothills, California · 16414 days ago · 8 km deep · 55 km away
  60. 1.63 km ENE of Grayson, California · 16414 days ago · -1 km deep · 63 km away

The first 60 of 65.

Before

  1. 1.814 km E of Seven Trees, California · 16471 days ago · 2 km deep · 61 km away
  2. 3.011 km SW of Brentwood, California · 16471 days ago · 16 km deep · 2 km away
  3. 2.122 km SE of Livermore, California · 16472 days ago · 6 km deep · 37 km away
  4. 1.815 km E of Seven Trees, California · 16472 days ago · 3 km deep · 62 km away
  5. 1.611 km E of Blackhawk, California · 16472 days ago · 13 km deep · 1 km away
  6. 1.615 km E of Seven Trees, California · 16473 days ago · 3 km deep · 62 km away
  7. 1.98 km ENE of San Martin, California · 16473 days ago · 5 km deep · 83 km away
  8. 1.76 km ENE of East Foothills, California · 16477 days ago · 4 km deep · 49 km away
  9. 1.52 km NE of Corralitos, California · 16478 days ago · 10 km deep · 92 km away
  10. 1.79 km SE of Livermore, California · 16480 days ago · 8 km deep · 24 km away
  11. 1.612 km WNW of Davenport, California · 16481 days ago · 4 km deep · 99 km away
  12. 2.311 km SE of Sunol, California · 16482 days ago · 3 km deep · 34 km away
  13. 1.65 km WSW of Gilroy, California · 16484 days ago · 4 km deep · 96 km away
  14. 1.76 km SE of Lexington Hills, California · 16485 days ago · 11 km deep · 79 km away
  15. 1.612 km ESE of East Foothills, California · 16486 days ago · 5 km deep · 57 km away
  16. 1.6Northern California · 16486 days ago · 13 km deep · 80 km away
  17. 2.110 km N of Moskowite Corner, California · 16486 days ago · 7 km deep · 87 km away
  18. 1.79 km NE of San Martin, California · 16487 days ago · 8 km deep · 79 km away
  19. 1.77 km E of Fairfield, California · 16487 days ago · 5 km deep · 48 km away
  20. 1.76 km E of Suisun, California · 16487 days ago · 5 km deep · 48 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1067158. Read Thu, Oct 1, 2026, 6:25 PM UTC.