California earthquakes

M1.9 earthquake 10km WSW of Chester, CA

A magnitude 1.9 earthquake struck 10km WSW of Chester, CA on Thu, Sep 23, 2021, 2:43 AM PDT (09:43 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M2.9 6km NNE of Hamilton City, CA. This one was a foreshock.

Chester 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
1.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-09-23 09:43:37 UTC
Depth
8.9 km (5.5 mi), shallow
Epicenter
40.260° N, 121.329° 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 0.4 km horizontally, 1.5 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
138°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 26 in the 60 days after this one and 15 in the 30 days before it.

After

  1. 1.56km NNE of Millville, CA · 1835 days ago · 13 km deep · 80 km away
  2. 2.24km ENE of Prattville, CA · 1834 days ago · 8 km deep · 18 km away
  3. 1.512km ESE of Viola, CA · 1830 days ago · 3 km deep · 30 km away
  4. 2.09km WSW of Chester, CA · 1830 days ago · 1 km deep · 1 km away
  5. 1.512km ESE of Viola, CA · 1829 days ago · 4 km deep · 29 km away
  6. 1.99km WSW of Chester, CA · 1828 days ago · 4 km deep · 1 km away
  7. 2.12km NW of Bella Vista, CA · 1827 days ago · 26 km deep · 90 km away
  8. 1.74km NW of Bella Vista, CA · 1827 days ago · 27 km deep · 91 km away
  9. 2.110km NNW of Burney, CA · 1824 days ago · 10 km deep · 85 km away
  10. 1.616km N of Shingletown, CA · 1817 days ago · 11 km deep · 62 km away · felt by 1
  11. 1.913km WSW of Almanor, CA · 1816 days ago · 9 km deep · 10 km away
  12. 2.96km NNE of Hamilton City, CA · 1813 days ago · 17 km deep · 77 km away
  13. 2.113km NE of Montgomery Creek, CA · 1805 days ago · 12 km deep · 84 km away
  14. 2.114km ESE of Viola, CA · 1804 days ago · 4 km deep · 29 km away
  15. 2.16km SW of Cromberg, CA · 1803 days ago · 2 km deep · 68 km away
  16. 2.13km NNE of Chester, CA · 1802 days ago · 8 km deep · 12 km away
  17. 1.83km NNE of Chester, CA · 1801 days ago · 10 km deep · 13 km away
  18. 2.75km ENE of East Quincy, CA · 1800 days ago · 5 km deep · 54 km away · felt by 7
  19. 1.836km SE of Fall River Mills, CA · 1799 days ago · 14 km deep · 55 km away
  20. 2.13km NNE of Chester, CA · 1796 days ago · 9 km deep · 12 km away
  21. 2.511km NNE of Bella Vista, CA · 1794 days ago · 9 km deep · 89 km away · felt by 2
  22. 1.812km NE of Bella Vista, CA · 1794 days ago · 7 km deep · 87 km away · felt by 1
  23. 2.215km SE of Honey Lake, CA · 1786 days ago · 3 km deep · 96 km away
  24. 2.23km WSW of Cromberg, CA · 1785 days ago · -2 km deep · 67 km away
  25. 1.69km S of Mineral, CA · 1779 days ago · 14 km deep · 19 km away
  26. 2.82km NE of Almanor, CA · 1779 days ago · 8 km deep · 15 km away · felt by 5

Before

  1. 2.56km NW of Chico, CA · 1841 days ago · 29 km deep · 72 km away
  2. 2.14km SE of Taylorsville, CA · 1842 days ago · 0 km deep · 51 km away
  3. 2.55km NNE of Hamilton City, CA · 1843 days ago · 19 km deep · 77 km away · felt by 1
  4. 1.72km SW of Palo Cedro, CA · 1847 days ago · 14 km deep · 85 km away
  5. 2.10km S of Palo Cedro, CA · 1847 days ago · 15 km deep · 84 km away · felt by 1
  6. 1.615km NNE of Mineral, CA · 1849 days ago · 3 km deep · 27 km away
  7. 1.912km ESE of Viola, CA · 1851 days ago · 5 km deep · 30 km away
  8. 1.51km NW of Palo Cedro, CA · 1852 days ago · 16 km deep · 85 km away
  9. 1.51km NW of Palo Cedro, CA · 1853 days ago · 15 km deep · 85 km away
  10. 1.61km SW of Palo Cedro, CA · 1854 days ago · 13 km deep · 85 km away
  11. 1.84km NNE of Hamilton City, CA · 1855 days ago · 14 km deep · 78 km away
  12. 1.72km WSW of Palo Cedro, CA · 1857 days ago · 18 km deep · 85 km away
  13. 2.811km NNE of Lake Davis, CA · 1857 days ago · 12 km deep · 82 km away · felt by 13
  14. 1.62km W of Palo Cedro, CA · 1861 days ago · 14 km deep · 86 km away
  15. 1.56km ESE of Bella Vista, CA · 1866 days ago · 14 km deep · 82 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73628396. Read Sun, Oct 4, 2026, 4:49 AM UTC.