California earthquakes

M1.8 earthquake 11 km WNW of Chester, California

A magnitude 1.8 earthquake struck 11 km WNW of Chester, California on Fri, Mar 22, 1985, 11:48 AM PST (19:48 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.2 Northern 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.

Open the live map with earthquakes

The earthquake

Magnitude
1.8 (md), micro
Local time
UTC
1985-03-22 19:48:53 UTC
Depth
3.0 km (1.9 mi), shallow
Epicenter
40.360° N, 121.344° 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 0.9 km horizontally, 5.9 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
232°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 25 in the 60 days after this one and 20 in the 30 days before it.

After

  1. 1.513 km N of Butte Meadows, California · 15156 days ago · 10 km deep · 25 km away
  2. 2.2Northern California · 15152 days ago · 5 km deep · 70 km away
  3. 2.313 km NNE of Mineral, California · 15151 days ago · 2 km deep · 21 km away
  4. 2.914 km E of Cottonwood, California · 15150 days ago · 11 km deep · 65 km away
  5. 2.313 km NNE of Mineral, California · 15149 days ago · 2 km deep · 21 km away
  6. 2.04 km ENE of Tobin, California · 15148 days ago · 12 km deep · 47 km away
  7. 3.01 km ESE of Anderson, California · 15147 days ago · 68 km deep · 79 km away
  8. 1.80 km NNW of Prattville, California · 15140 days ago · 3 km deep · 23 km away
  9. 2.111 km E of Red Bluff, California · 15139 days ago · 14 km deep · 67 km away
  10. 1.614 km NE of Proberta, California · 15138 days ago · 0 km deep · 63 km away
  11. 2.810 km E of Red Bluff, California · 15135 days ago · 10 km deep · 69 km away
  12. 1.812 km E of Red Bluff, California · 15135 days ago · 1 km deep · 67 km away
  13. 2.913 km NE of Proberta, California · 15135 days ago · -1 km deep · 66 km away
  14. 2.312 km ESE of Bend, California · 15135 days ago · 17 km deep · 63 km away
  15. 2.010 km E of Red Bluff, California · 15134 days ago · 4 km deep · 68 km away
  16. 2.17 km NNW of Richvale, California · 15133 days ago · 5 km deep · 97 km away
  17. 2.620 km SE of Bieber, CA · 15121 days ago · 4 km deep · 76 km away
  18. 1.710 km E of Red Bluff, California · 15117 days ago · 3 km deep · 69 km away
  19. 1.912 km ENE of Bend, California · 15116 days ago · 7 km deep · 62 km away
  20. 2.31 km SW of Lake Almanor West, California · 15111 days ago · 3 km deep · 18 km away
  21. 2.412 km ENE of Shingletown, California · 15108 days ago · 35 km deep · 38 km away
  22. 1.78 km WSW of Red Bluff, California · 15107 days ago · 17 km deep · 87 km away
  23. 2.613 km ESE of Mineral, California · 15106 days ago · 8 km deep · 10 km away
  24. 1.716 km NE of Mineral, California · 15103 days ago · 4 km deep · 16 km away
  25. 2.00 km NE of Butte Meadows, California · 15099 days ago · 3 km deep · 35 km away

Before

  1. 1.79 km NNE of Mineral, California · 15159 days ago · 5 km deep · 19 km away
  2. 1.68 km ESE of Hat Creek, California · 15160 days ago · 3 km deep · 49 km away
  3. 1.96 km NE of Crescent Mills, California · 15161 days ago · 3 km deep · 47 km away
  4. 2.27 km W of La Porte, California · 15163 days ago · 7 km deep · 78 km away
  5. 1.97 km W of La Porte, California · 15165 days ago · 12 km deep · 80 km away
  6. 1.65 km W of La Porte, California · 15166 days ago · 12 km deep · 79 km away
  7. 2.19 km NW of Belden, California · 15168 days ago · 4 km deep · 34 km away
  8. 2.58 km WSW of La Porte, California · 15169 days ago · 14 km deep · 81 km away
  9. 1.98 km W of La Porte, California · 15169 days ago · 11 km deep · 79 km away
  10. 2.32 km WNW of La Porte, California · 15169 days ago · 12 km deep · 80 km away
  11. 1.86 km ENE of Chico, California · 15169 days ago · 22 km deep · 77 km away
  12. 1.513 km NE of Butte Meadows, California · 15172 days ago · 2 km deep · 22 km away
  13. 2.21 km NNW of Plumas Eureka, California · 15172 days ago · 3 km deep · 85 km away
  14. 1.79 km W of Cottonwood, California · 15173 days ago · 5 km deep · 89 km away
  15. 2.53 km S of Graeagle, California · 15175 days ago · 4 km deep · 93 km away
  16. 2.53 km N of Plumas Eureka, California · 15176 days ago · -1 km deep · 84 km away
  17. 1.714 km NNE of Mineral, California · 15179 days ago · 3 km deep · 19 km away
  18. 1.921 km S of Nubieber, California · 15186 days ago · 13 km deep · 62 km away
  19. 2.015 km SW of Lake Almanor West, California · 15186 days ago · 8 km deep · 25 km away
  20. 1.85 km WSW of Bella Vista, California · 15187 days ago · 4 km deep · 85 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc45250. Read Tue, Sep 22, 2026, 10:35 PM UTC.