California earthquakes

M1.5 earthquake 11km SW of Chester, CA

A magnitude 1.5 earthquake struck 11km SW of Chester, CA on Wed, Mar 17, 2021, 8:39 PM PDT (03:39 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M3.0 13km W of Shingletown, 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
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-03-18 03:39:53 UTC
Depth
8.7 km (5.4 mi), shallow
Epicenter
40.246° N, 121.330° 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, 0.8 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
101°
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: 29 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 2.513km N of Viola, CA · 2019 days ago · 8 km deep · 51 km away
  2. 1.516km NNW of Shingletown, CA · 2014 days ago · 3 km deep · 69 km away
  3. 1.72 km ENE of East Quincy, California · 2013 days ago · 15 km deep · 52 km away
  4. 2.03km WSW of Whitehawk, CA · 2012 days ago · 9 km deep · 88 km away
  5. 3.013km W of Shingletown, CA · 2011 days ago · 19 km deep · 65 km away · felt by 77
  6. 1.512km W of Shingletown, CA · 2008 days ago · 17 km deep · 65 km away
  7. 1.66km WNW of Palo Cedro, CA · 2008 days ago · 15 km deep · 90 km away
  8. 1.814km NNE of Mineral, CA · 2008 days ago · 3 km deep · 30 km away
  9. 2.214km NNE of Mineral, CA · 2008 days ago · 3 km deep · 30 km away
  10. 1.95km NNE of Almanor, CA · 2007 days ago · 7 km deep · 15 km away
  11. 1.84km SSE of Hamilton City, CA · 2007 days ago · 16 km deep · 83 km away
  12. 1.730km NNW of Forest Ranch, CA · 2006 days ago · 16 km deep · 40 km away
  13. 2.02km ENE of Montgomery Creek, CA · 2003 days ago · 15 km deep · 83 km away
  14. 2.23km ENE of Canyondam, CA · 2002 days ago · 5 km deep · 25 km away
  15. 2.39km ENE of Viola, CA · 2000 days ago · 3 km deep · 39 km away
  16. 1.921km SE of Anderson, CA · 1998 days ago · 12 km deep · 66 km away
  17. 1.814km NNW of Viola, CA · 1998 days ago · 0 km deep · 56 km away
  18. 2.19km NNE of Burney, CA · 1996 days ago · 13 km deep · 84 km away
  19. 1.89km ESE of Millville, CA · 1990 days ago · 16 km deep · 72 km away
  20. 2.010km WNW of Viola, CA · 1989 days ago · 10 km deep · 52 km away
  21. 1.818km WSW of Almanor, CA · 1988 days ago · 11 km deep · 10 km away
  22. 1.922km SSW of Whitehawk, CA · 1987 days ago · 8 km deep · 100 km away · felt by 1
  23. 2.219km WSW of Manton, CA · 1983 days ago · 15 km deep · 62 km away
  24. 2.72km NNW of Chico, CA · 1981 days ago · 14 km deep · 70 km away · felt by 4
  25. 1.72km NE of Chester, CA · 1973 days ago · 10 km deep · 13 km away
  26. 1.913km W of Shingletown, CA · 1973 days ago · 17 km deep · 66 km away
  27. 1.833km NNW of Susanville, CA · 1970 days ago · 13 km deep · 66 km away
  28. 1.625km NNE of Hamilton Branch, CA · 1969 days ago · 2 km deep · 40 km away
  29. 2.01km NW of Lake Davis, CA · 1967 days ago · 4 km deep · 84 km away

Before

  1. 1.813km NNE of Shingletown, CA · 2026 days ago · 7 km deep · 56 km away
  2. 2.315km E of Anderson, CA · 2027 days ago · 21 km deep · 70 km away
  3. 1.619km NW of Viola, CA · 2029 days ago · 9 km deep · 61 km away
  4. 2.64km NNE of Almanor, CA · 2036 days ago · 9 km deep · 14 km away · felt by 5
  5. 1.56km NNE of Almanor, CA · 2036 days ago · 8 km deep · 14 km away · felt by 1
  6. 1.816km NNW of Shingletown, CA · 2037 days ago · 15 km deep · 67 km away
  7. 2.08km NNW of Chester, CA · 2045 days ago · 5 km deep · 16 km away
  8. 1.57km ENE of Mineral, CA · 2049 days ago · 9 km deep · 21 km away
  9. 1.63km S of Canyondam, CA · 2051 days ago · 8 km deep · 24 km away
  10. 1.712km SE of Mineral, CA · 2051 days ago · 6 km deep · 12 km away
  11. 2.13km W of Chico, CA · 2052 days ago · 13 km deep · 73 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73538680. Read Sat, Oct 3, 2026, 2:07 PM UTC.