California earthquakes

M1.6 earthquake 1km S of Blackhawk, CA

A magnitude 1.6 earthquake struck 1km S of Blackhawk, CA on Tue, Oct 5, 2021, 9:56 AM PDT (16:56 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M3.9 1km NE of San Ramon, CA. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-10-05 16:56:05 UTC
Depth
8.6 km (5.4 mi), shallow
Epicenter
37.810° N, 121.906° 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, 0.6 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
87°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 74 in the 60 days after this one and 33 in the 30 days before it.

After

  1. 1.82km SE of Pacheco, CA · 1824 days ago · 15 km deep · 22 km away
  2. 1.95km SW of Pacheco, CA · 1824 days ago · 10 km deep · 25 km away · felt by 1
  3. 2.16km SSW of Yountville, CA · 1824 days ago · 8 km deep · 74 km away · felt by 4
  4. 2.16km SSW of Moraga, CA · 1823 days ago · 10 km deep · 22 km away · felt by 6
  5. 2.14km WSW of Alamo, CA · 1822 days ago · 15 km deep · 14 km away · felt by 3
  6. 1.64km SSW of San Francisco Zoo, CA · 1822 days ago · 7 km deep · 56 km away · felt by 1
  7. 1.612km W of Saratoga, CA · 1821 days ago · 8 km deep · 67 km away
  8. 1.711km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 67 km away
  9. 1.611km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 67 km away
  10. 1.511km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 67 km away
  11. 1.63km W of Fruitdale, CA · 1819 days ago · 5 km deep · 55 km away
  12. 2.13km WNW of Crockett, CA · 1818 days ago · 8 km deep · 41 km away · felt by 4
  13. 2.816km SSE of Livermore, CA · 1813 days ago · 3 km deep · 34 km away · felt by 70
  14. 1.65km SW of Clayton, CA · 1812 days ago · 10 km deep · 12 km away
  15. 1.69km SE of Sunol, CA · 1812 days ago · 9 km deep · 31 km away
  16. 1.91km S of San Ramon, CA · 1811 days ago · 8 km deep · 8 km away · felt by 4
  17. 1.610km NE of Milpitas, CA · 1810 days ago · 4 km deep · 36 km away
  18. 2.14km ENE of El Sobrante, CA · 1808 days ago · 9 km deep · 36 km away · felt by 3
  19. 2.84km ENE of El Sobrante, CA · 1807 days ago · 10 km deep · 36 km away · felt by 328
  20. 2.04km ENE of El Sobrante, CA · 1807 days ago · 9 km deep · 36 km away · felt by 2
  21. 2.36km SSW of Gilroy, CA · 1807 days ago · 4 km deep · 99 km away · felt by 2
  22. 1.61km SW of Alamo, CA · 1806 days ago · 9 km deep · 12 km away
  23. 1.64km ENE of Burlingame, CA · 1806 days ago · 8 km deep · 44 km away · felt by 2
  24. 1.922km NE of Morgan Hill, CA · 1805 days ago · 9 km deep · 72 km away
  25. 2.07km W of Kenwood, CA · 1804 days ago · 5 km deep · 93 km away · felt by 3
  26. 2.68km ENE of Alum Rock, CA · 1804 days ago · 7 km deep · 49 km away · felt by 18
  27. 2.09km SW of Brentwood, CA · 1798 days ago · 17 km deep · 12 km away
  28. 1.52km SW of San Francisco Zoo, CA · 1798 days ago · 7 km deep · 55 km away · felt by 1
  29. 1.61km SSE of San Ramon, CA · 1797 days ago · 8 km deep · 8 km away
  30. 1.66km N of San Leandro, CA · 1797 days ago · 9 km deep · 22 km away
  31. 1.511km SW of Mountain House, CA · 1795 days ago · 17 km deep · 28 km away
  32. 2.17km NE of San Martin, CA · 1794 days ago · 5 km deep · 83 km away
  33. 2.61km W of Kensington, CA · 1794 days ago · 5 km deep · 36 km away · felt by 1,893
  34. 2.31km W of Kensington, CA · 1794 days ago · 5 km deep · 36 km away · felt by 162
  35. 1.810km ENE of Morgan Hill, CA · 1794 days ago · 3 km deep · 79 km away
  36. 1.68km ENE of Gilroy, CA · 1792 days ago · 7 km deep · 94 km away · felt by 1
  37. 2.05km E of Fremont, CA · 1787 days ago · 9 km deep · 30 km away · felt by 3
  38. 1.67km E of Penngrove, CA · 1785 days ago · 7 km deep · 80 km away · felt by 1
  39. 1.714km E of Angwin, CA · 1784 days ago · 5 km deep · 91 km away
  40. 1.710km NE of Napa, CA · 1783 days ago · 7 km deep · 67 km away
  41. 3.91km NE of San Ramon, CA · 1782 days ago · 10 km deep · 6 km away · felt by 4,732
  42. 3.22km NE of San Ramon, CA · 1782 days ago · 10 km deep · 5 km away
  43. 2.51km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 39
  44. 2.11km NNE of San Ramon, CA · 1782 days ago · 10 km deep · 6 km away
  45. 2.31km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 3
  46. 1.71km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away
  47. 3.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 259
  48. 1.52km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 1
  49. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away
  50. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 19
  51. 1.81km NE of San Ramon, CA · 1782 days ago · 10 km deep · 6 km away · felt by 5
  52. 1.61km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 4
  53. 1.61km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 8
  54. 1.51km NE of San Ramon, CA · 1782 days ago · 9 km deep · 6 km away · felt by 1
  55. 2.01km NE of San Ramon, CA · 1781 days ago · 9 km deep · 6 km away
  56. 1.62km NE of San Ramon, CA · 1781 days ago · 9 km deep · 6 km away · felt by 2
  57. 2.72km NE of San Ramon, CA · 1781 days ago · 10 km deep · 5 km away · felt by 88
  58. 1.81km NE of San Ramon, CA · 1781 days ago · 9 km deep · 6 km away · felt by 3
  59. 1.71km NE of San Ramon, CA · 1781 days ago · 9 km deep · 6 km away
  60. 1.91km NE of San Ramon, CA · 1780 days ago · 10 km deep · 6 km away

The first 60 of 74.

Before

  1. 2.70km N of Byron, CA · 1826 days ago · 4 km deep · 25 km away · felt by 48
  2. 1.85km SW of San Francisco Zoo, CA · 1827 days ago · 7 km deep · 58 km away
  3. 2.019km NE of Alum Rock, CA · 1827 days ago · 6 km deep · 40 km away
  4. 3.312km NNE of Morgan Hill, CA · 1827 days ago · 4 km deep · 69 km away · felt by 103
  5. 1.53km N of San Leandro, CA · 1828 days ago · 6 km deep · 23 km away · felt by 14
  6. 3.43km N of San Leandro, CA · 1828 days ago · 6 km deep · 23 km away · felt by 1,793
  7. 1.78km NNE of Alum Rock, CA · 1828 days ago · 4 km deep · 43 km away · felt by 1
  8. 1.59km NE of Santa Rosa, CA · 1828 days ago · 4 km deep · 99 km away
  9. 3.03km N of San Leandro, CA · 1828 days ago · 7 km deep · 23 km away · felt by 860
  10. 1.611km NE of Napa, CA · 1829 days ago · 9 km deep · 67 km away
  11. 3.23km ESE of Santa Rosa, CA · 1830 days ago · 9 km deep · 97 km away · felt by 1,048
  12. 1.510km E of Alum Rock, CA · 1830 days ago · 8 km deep · 53 km away
  13. 1.514km SW of Portola Valley, CA · 1832 days ago · 4 km deep · 68 km away
  14. 2.12km E of Hayward, CA · 1835 days ago · 3 km deep · 23 km away · felt by 22
  15. 2.71km SSE of Vallejo, CA · 1836 days ago · 11 km deep · 43 km away · felt by 481
  16. 1.81km WNW of Walnut Creek, CA · 1836 days ago · 11 km deep · 19 km away · felt by 2
  17. 1.85km WNW of Dublin, CA · 1836 days ago · 7 km deep · 12 km away · felt by 1
  18. 1.94km SW of Newark, CA · 1837 days ago · 12 km deep · 37 km away · felt by 2
  19. 2.59km ENE of Milpitas, CA · 1838 days ago · 7 km deep · 40 km away · felt by 23
  20. 1.75km NW of Dublin, CA · 1838 days ago · 5 km deep · 11 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73633836. Read Sun, Oct 4, 2026, 8:42 AM UTC.