California earthquakes

M1.6 earthquake 9km SE of Sunol, CA

A magnitude 1.6 earthquake struck 9km SE of Sunol, CA on Mon, Oct 18, 2021, 7:47 AM PDT (14:47 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
2021-10-18 14:47:37 UTC
Depth
8.6 km (5.4 mi), shallow
Epicenter
37.543° N, 121.830° 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, 0.4 km in depth
Magnitude uncertainty
±0.21
Depth from
From location
Station coverage gap
43°
Stations used
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 79 in the 60 days after this one and 48 in the 30 days before it.

After

  1. 1.91km S of San Ramon, CA · 1811 days ago · 8 km deep · 28 km away · felt by 4
  2. 1.610km NE of Milpitas, CA · 1810 days ago · 4 km deep · 5 km away
  3. 2.14km ENE of El Sobrante, CA · 1808 days ago · 9 km deep · 62 km away · felt by 3
  4. 2.84km ENE of El Sobrante, CA · 1807 days ago · 10 km deep · 62 km away · felt by 328
  5. 2.04km ENE of El Sobrante, CA · 1807 days ago · 9 km deep · 62 km away · felt by 2
  6. 2.36km SSW of Gilroy, CA · 1807 days ago · 4 km deep · 69 km away · felt by 2
  7. 1.61km SW of Alamo, CA · 1807 days ago · 9 km deep · 38 km away
  8. 1.96km ENE of Hollister, CA · 1806 days ago · 8 km deep · 86 km away
  9. 1.53km SW of Hollister, CA · 1806 days ago · 8 km deep · 88 km away · felt by 1
  10. 1.64km ENE of Burlingame, CA · 1806 days ago · 8 km deep · 44 km away · felt by 2
  11. 1.922km NE of Morgan Hill, CA · 1805 days ago · 9 km deep · 44 km away
  12. 2.68km ENE of Alum Rock, CA · 1804 days ago · 7 km deep · 19 km away · felt by 18
  13. 2.09km SW of Brentwood, CA · 1799 days ago · 17 km deep · 37 km away
  14. 1.52km SW of San Francisco Zoo, CA · 1798 days ago · 7 km deep · 64 km away · felt by 1
  15. 1.61km SSE of San Ramon, CA · 1797 days ago · 8 km deep · 28 km away
  16. 1.66km N of San Leandro, CA · 1797 days ago · 9 km deep · 39 km away
  17. 1.511km SW of Mountain House, CA · 1795 days ago · 17 km deep · 26 km away
  18. 2.17km NE of San Martin, CA · 1795 days ago · 5 km deep · 53 km away
  19. 2.61km W of Kensington, CA · 1794 days ago · 5 km deep · 58 km away · felt by 1,893
  20. 1.99km SSE of San Juan Bautista, CA · 1794 days ago · 10 km deep · 91 km away · felt by 2
  21. 2.31km W of Kensington, CA · 1794 days ago · 5 km deep · 58 km away · felt by 162
  22. 1.810km ENE of Morgan Hill, CA · 1794 days ago · 3 km deep · 49 km away
  23. 1.67km WSW of Ridgemark, CA · 1794 days ago · 12 km deep · 92 km away
  24. 2.46km N of Hollister, CA · 1792 days ago · 10 km deep · 81 km away · felt by 12
  25. 1.68km ENE of Gilroy, CA · 1792 days ago · 7 km deep · 64 km away · felt by 1
  26. 2.05km E of Fremont, CA · 1788 days ago · 9 km deep · 8 km away · felt by 3
  27. 2.15km S of San Juan Bautista, CA · 1785 days ago · 7 km deep · 86 km away · felt by 1
  28. 1.710km NE of Napa, CA · 1784 days ago · 7 km deep · 97 km away
  29. 3.91km NE of San Ramon, CA · 1782 days ago · 10 km deep · 30 km away · felt by 4,732
  30. 3.22km NE of San Ramon, CA · 1782 days ago · 10 km deep · 30 km away
  31. 2.51km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 39
  32. 2.11km NNE of San Ramon, CA · 1782 days ago · 10 km deep · 30 km away
  33. 2.31km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 3
  34. 1.71km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away
  35. 3.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 259
  36. 1.52km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 1
  37. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away
  38. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 19
  39. 1.81km NE of San Ramon, CA · 1782 days ago · 10 km deep · 30 km away · felt by 5
  40. 1.61km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 4
  41. 1.61km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 8
  42. 1.51km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 1
  43. 2.01km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away
  44. 1.62km NE of San Ramon, CA · 1782 days ago · 9 km deep · 30 km away · felt by 2
  45. 2.72km NE of San Ramon, CA · 1782 days ago · 10 km deep · 30 km away · felt by 88
  46. 1.81km NE of San Ramon, CA · 1781 days ago · 9 km deep · 30 km away · felt by 3
  47. 1.71km NE of San Ramon, CA · 1781 days ago · 9 km deep · 30 km away
  48. 2.25km SW of Tres Pinos, CA · 1780 days ago · 6 km deep · 97 km away
  49. 1.91km NE of San Ramon, CA · 1780 days ago · 10 km deep · 30 km away
  50. 1.78km WSW of Mountain House, CA · 1780 days ago · 0 km deep · 30 km away
  51. 1.75km E of Fremont, CA · 1779 days ago · 9 km deep · 8 km away
  52. 2.112km ENE of Morgan Hill, CA · 1778 days ago · 4 km deep · 49 km away
  53. 1.98km SSW of Brentwood, CA · 1778 days ago · 19 km deep · 36 km away · felt by 1
  54. 2.211km NW of Morgan Hill, CA · 1778 days ago · 6 km deep · 38 km away · felt by 1
  55. 1.97km ESE of Bethel Island, CA · 1778 days ago · 9 km deep · 54 km away
  56. 2.14km W of San Juan Bautista, CA · 1776 days ago · 6 km deep · 81 km away
  57. 2.012km SW of Ridgemark, CA · 1775 days ago · 6 km deep · 95 km away
  58. 1.68km SW of Ridgemark, CA · 1773 days ago · 10 km deep · 92 km away
  59. 1.723km WNW of Bonny Doon, CA · 1772 days ago · 7 km deep · 68 km away
  60. 2.51km W of Kensington, CA · 1769 days ago · 5 km deep · 57 km away · felt by 965

The first 60 of 79.

Before

  1. 2.94km SSW of San Juan Bautista, CA · 1812 days ago · 7 km deep · 85 km away · felt by 20
  2. 1.65km SW of Clayton, CA · 1812 days ago · 10 km deep · 42 km away
  3. 2.816km SSE of Livermore, CA · 1813 days ago · 3 km deep · 11 km away · felt by 70
  4. 2.011km SSW of Ridgemark, CA · 1814 days ago · 7 km deep · 98 km away
  5. 2.13km WNW of Crockett, CA · 1818 days ago · 8 km deep · 68 km away · felt by 4
  6. 1.63km W of Fruitdale, CA · 1819 days ago · 5 km deep · 28 km away
  7. 1.511km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 44 km away
  8. 1.611km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 44 km away
  9. 1.711km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 44 km away
  10. 2.16km S of San Juan Bautista, CA · 1821 days ago · 8 km deep · 88 km away
  11. 2.516km SSW of Bonny Doon, CA · 1821 days ago · 5 km deep · 78 km away · felt by 10
  12. 1.612km W of Saratoga, CA · 1822 days ago · 8 km deep · 44 km away
  13. 1.64km SSW of San Francisco Zoo, CA · 1822 days ago · 7 km deep · 64 km away · felt by 1
  14. 2.14km WSW of Alamo, CA · 1823 days ago · 15 km deep · 39 km away · felt by 3
  15. 2.16km SSW of Moraga, CA · 1823 days ago · 10 km deep · 39 km away · felt by 6
  16. 1.95km SW of Pacheco, CA · 1824 days ago · 10 km deep · 53 km away · felt by 1
  17. 1.82km SE of Pacheco, CA · 1825 days ago · 15 km deep · 52 km away
  18. 1.61km S of Blackhawk, CA · 1825 days ago · 9 km deep · 31 km away
  19. 2.70km N of Byron, CA · 1826 days ago · 4 km deep · 40 km away · felt by 48
  20. 1.85km SW of San Francisco Zoo, CA · 1827 days ago · 7 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73641160. Read Sun, Oct 4, 2026, 12:37 PM UTC.