California earthquakes

M1.6 earthquake 5km SW of Clayton, CA

A magnitude 1.6 earthquake struck 5km SW of Clayton, CA on Mon, Oct 18, 2021, 2:23 AM PDT (09:23 UTC), 10 km (6 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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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
2021-10-18 09:23:39 UTC
Depth
10.4 km (6.5 mi), shallow
Epicenter
37.904° N, 121.976° 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, 0.4 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
55°
Stations used
37

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 75 in the 60 days after this one and 42 in the 30 days before it.

After

  1. 1.69km SE of Sunol, CA · 1812 days ago · 9 km deep · 42 km away
  2. 1.91km S of San Ramon, CA · 1811 days ago · 8 km deep · 15 km away · felt by 4
  3. 1.610km NE of Milpitas, CA · 1810 days ago · 4 km deep · 47 km away
  4. 2.14km ENE of El Sobrante, CA · 1808 days ago · 9 km deep · 26 km away · felt by 3
  5. 2.84km ENE of El Sobrante, CA · 1807 days ago · 10 km deep · 26 km away · felt by 328
  6. 2.04km ENE of El Sobrante, CA · 1807 days ago · 9 km deep · 26 km away · felt by 2
  7. 1.61km SW of Alamo, CA · 1807 days ago · 9 km deep · 9 km away
  8. 1.64km ENE of Burlingame, CA · 1806 days ago · 8 km deep · 46 km away · felt by 2
  9. 2.34km SE of Larkfield-Wikiup, CA · 1805 days ago · 8 km deep · 92 km away · felt by 9
  10. 1.922km NE of Morgan Hill, CA · 1805 days ago · 9 km deep · 84 km away
  11. 2.07km W of Kenwood, CA · 1804 days ago · 5 km deep · 81 km away · felt by 3
  12. 2.68km ENE of Alum Rock, CA · 1804 days ago · 7 km deep · 61 km away · felt by 18
  13. 2.09km SW of Brentwood, CA · 1799 days ago · 17 km deep · 16 km away
  14. 1.52km SW of San Francisco Zoo, CA · 1799 days ago · 7 km deep · 52 km away · felt by 1
  15. 1.61km SSE of San Ramon, CA · 1797 days ago · 8 km deep · 15 km away
  16. 1.66km N of San Leandro, CA · 1797 days ago · 9 km deep · 21 km away
  17. 1.618km NNE of Angwin, CA · 1795 days ago · 9 km deep · 97 km away · felt by 1
  18. 1.511km SW of Mountain House, CA · 1795 days ago · 17 km deep · 39 km away
  19. 2.17km NE of San Martin, CA · 1795 days ago · 5 km deep · 95 km away
  20. 2.61km W of Kensington, CA · 1794 days ago · 5 km deep · 28 km away · felt by 1,893
  21. 2.31km W of Kensington, CA · 1794 days ago · 5 km deep · 28 km away · felt by 162
  22. 1.810km ENE of Morgan Hill, CA · 1794 days ago · 3 km deep · 91 km away
  23. 2.05km E of Fremont, CA · 1788 days ago · 9 km deep · 41 km away · felt by 3
  24. 1.67km E of Penngrove, CA · 1785 days ago · 7 km deep · 69 km away · felt by 1
  25. 1.714km E of Angwin, CA · 1784 days ago · 5 km deep · 79 km away
  26. 1.710km NE of Napa, CA · 1784 days ago · 7 km deep · 55 km away
  27. 3.91km NE of San Ramon, CA · 1782 days ago · 10 km deep · 13 km away · felt by 4,732
  28. 3.22km NE of San Ramon, CA · 1782 days ago · 10 km deep · 13 km away
  29. 2.51km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 39
  30. 2.11km NNE of San Ramon, CA · 1782 days ago · 10 km deep · 13 km away
  31. 2.31km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 3
  32. 1.71km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away
  33. 3.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 259
  34. 1.52km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 1
  35. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away
  36. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 19
  37. 1.81km NE of San Ramon, CA · 1782 days ago · 10 km deep · 13 km away · felt by 5
  38. 1.61km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 4
  39. 1.61km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 8
  40. 1.51km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 1
  41. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away
  42. 1.62km NE of San Ramon, CA · 1782 days ago · 9 km deep · 13 km away · felt by 2
  43. 2.72km NE of San Ramon, CA · 1782 days ago · 10 km deep · 13 km away · felt by 88
  44. 1.81km NE of San Ramon, CA · 1781 days ago · 9 km deep · 13 km away · felt by 3
  45. 1.71km NE of San Ramon, CA · 1781 days ago · 9 km deep · 13 km away
  46. 1.91km NE of San Ramon, CA · 1780 days ago · 10 km deep · 13 km away
  47. 1.83km S of Dillon Beach, CA · 1780 days ago · 10 km deep · 93 km away
  48. 2.44km S of Dillon Beach, CA · 1780 days ago · 10 km deep · 92 km away
  49. 1.78km WSW of Mountain House, CA · 1780 days ago · 0 km deep · 34 km away
  50. 1.75km E of Fremont, CA · 1779 days ago · 9 km deep · 41 km away
  51. 2.112km ENE of Morgan Hill, CA · 1779 days ago · 4 km deep · 90 km away
  52. 1.98km SSW of Brentwood, CA · 1778 days ago · 19 km deep · 19 km away · felt by 1
  53. 2.211km NW of Morgan Hill, CA · 1778 days ago · 6 km deep · 80 km away · felt by 1
  54. 1.97km ESE of Bethel Island, CA · 1778 days ago · 9 km deep · 36 km away
  55. 1.67km ENE of Kenwood, CA · 1772 days ago · 7 km deep · 73 km away
  56. 1.723km WNW of Bonny Doon, CA · 1772 days ago · 7 km deep · 95 km away
  57. 2.51km W of Kensington, CA · 1769 days ago · 5 km deep · 27 km away · felt by 965
  58. 2.01km W of Kensington, CA · 1769 days ago · 5 km deep · 28 km away · felt by 43
  59. 2.79km ENE of Morgan Hill, CA · 1769 days ago · 2 km deep · 90 km away · felt by 38
  60. 1.74km S of Portola Valley, CA · 1767 days ago · 6 km deep · 66 km away

The first 60 of 75.

Before

  1. 2.816km SSE of Livermore, CA · 1813 days ago · 3 km deep · 46 km away · felt by 70
  2. 2.010km NNE of Angwin, CA · 1816 days ago · 7 km deep · 92 km away
  3. 2.13km WNW of Crockett, CA · 1818 days ago · 8 km deep · 29 km away · felt by 4
  4. 1.63km W of Fruitdale, CA · 1819 days ago · 5 km deep · 66 km away
  5. 1.511km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 76 km away
  6. 1.611km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 75 km away
  7. 1.711km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 75 km away
  8. 1.612km W of Saratoga, CA · 1822 days ago · 8 km deep · 75 km away
  9. 1.64km SSW of San Francisco Zoo, CA · 1822 days ago · 7 km deep · 53 km away · felt by 1
  10. 2.14km WSW of Alamo, CA · 1823 days ago · 15 km deep · 11 km away · felt by 3
  11. 2.16km SSW of Moraga, CA · 1823 days ago · 10 km deep · 21 km away · felt by 6
  12. 2.16km SSW of Yountville, CA · 1824 days ago · 8 km deep · 62 km away · felt by 4
  13. 1.95km SW of Pacheco, CA · 1824 days ago · 10 km deep · 14 km away · felt by 1
  14. 1.82km SE of Pacheco, CA · 1825 days ago · 15 km deep · 10 km away
  15. 1.61km S of Blackhawk, CA · 1825 days ago · 9 km deep · 12 km away
  16. 2.70km N of Byron, CA · 1826 days ago · 4 km deep · 30 km away · felt by 48
  17. 1.85km SW of San Francisco Zoo, CA · 1827 days ago · 7 km deep · 55 km away
  18. 2.019km NE of Alum Rock, CA · 1827 days ago · 6 km deep · 52 km away
  19. 3.312km NNE of Morgan Hill, CA · 1827 days ago · 4 km deep · 81 km away · felt by 103
  20. 1.53km N of San Leandro, CA · 1828 days ago · 6 km deep · 23 km away · felt by 14

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73641085. Read Sun, Oct 4, 2026, 2:04 PM UTC.