California earthquakes

M2.1 earthquake 10 km N of Chester, California

A magnitude 2.1 earthquake struck 10 km N of Chester, California on Fri, Jul 25, 1986, 4:38 PM PDT (23:38 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M2.9 11 km E of Durham, California. 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
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1986-07-25 23:38:46 UTC
Depth
2.3 km (1.4 mi), shallow
Epicenter
40.400° N, 121.234° 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 1.7 km horizontally, 1.5 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
248°, poorly surrounded by stations
Stations used
7

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. 2.014 km NNE of Mineral, California · 14678 days ago · 3 km deep · 24 km away
  2. 2.15 km NW of Belden, California · 14674 days ago · 9 km deep · 41 km away
  3. 2.214 km SW of Lake Almanor West, California · 14673 days ago · 9 km deep · 28 km away
  4. 1.617 km NNE of Mineral, California · 14669 days ago · 1 km deep · 23 km away
  5. 2.911 km E of Durham, California · 14668 days ago · 5 km deep · 92 km away
  6. 1.75 km NNW of Anderson, California · 14668 days ago · 4 km deep · 92 km away
  7. 2.66 km NE of Greenhorn, California · 14665 days ago · 3 km deep · 68 km away
  8. 2.013 km NNE of Mineral, California · 14661 days ago · 2 km deep · 29 km away
  9. 1.814 km NNE of Mineral, California · 14661 days ago · 4 km deep · 27 km away
  10. 1.812 km NE of Los Molinos, California · 14661 days ago · 4 km deep · 73 km away
  11. 1.616 km ENE of Shingletown, California · 14659 days ago · 10 km deep · 45 km away
  12. 2.54 km ENE of Greenhorn, California · 14657 days ago · 5 km deep · 69 km away
  13. 1.77 km SSE of Millville, California · 14656 days ago · 4 km deep · 77 km away
  14. 2.210 km WSW of Mineral, California · 14655 days ago · 7 km deep · 42 km away
  15. 1.915 km WSW of Old Station, California · 14650 days ago · 7 km deep · 38 km away
  16. 2.06 km WSW of Lake Almanor West, California · 14644 days ago · 9 km deep · 21 km away
  17. 1.715 km N of Mineral, California · 14642 days ago · 16 km deep · 30 km away
  18. 1.623 km ENE of Old Station, California · 14641 days ago · 3 km deep · 41 km away
  19. 2.110 km SSW of Old Station, California · 14641 days ago · 3 km deep · 31 km away
  20. 2.26 km E of Yankee Hill, California · 14633 days ago · 5 km deep · 80 km away
  21. 2.24 km ENE of Yankee Hill, California · 14632 days ago · 5 km deep · 78 km away
  22. 2.45 km E of Concow, CA · 14632 days ago · 5 km deep · 76 km away
  23. 1.68 km N of Berry Creek, California · 14632 days ago · 5 km deep · 77 km away
  24. 2.310 km NNE of Shingletown, California · 14630 days ago · 17 km deep · 56 km away
  25. 1.713 km NE of Butte Meadows, California · 14630 days ago · 8 km deep · 31 km away
  26. 1.79 km E of Millville, California · 14628 days ago · 11 km deep · 72 km away
  27. 2.22 km S of Canyondam, California · 14625 days ago · 2 km deep · 31 km away
  28. 1.66 km SE of Shasta Lake, California · 14622 days ago · 20 km deep · 96 km away
  29. 1.52 km W of Bella Vista, California · 14622 days ago · 5 km deep · 91 km away

Before

  1. 2.16 km SE of Redding, California · 14679 days ago · 18 km deep · 94 km away
  2. 2.511 km E of Cottonwood, California · 14679 days ago · 26 km deep · 77 km away
  3. 2.713 km W of Lake Almanor West, California · 14683 days ago · 6 km deep · 21 km away
  4. 3.015 km SW of Lake Almanor West, California · 14684 days ago · 7 km deep · 29 km away
  5. 2.314 km NW of Chester, California · 14689 days ago · 1 km deep · 9 km away
  6. 3.217 km ENE of Mineral, California · 14696 days ago · 3 km deep · 15 km away
  7. 1.61 km SW of Lake Almanor Country Club, California · 14697 days ago · 10 km deep · 19 km away
  8. 1.711 km NNE of Westwood, California · 14704 days ago · 1 km deep · 25 km away
  9. 2.23 km SW of Prattville, California · 14704 days ago · 8 km deep · 24 km away
  10. 1.93 km SW of Prattville, California · 14705 days ago · 4 km deep · 24 km away
  11. 2.52 km S of Taylorsville, California · 14708 days ago · 2 km deep · 51 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc89709. Read Sat, Oct 3, 2026, 12:54 AM UTC.