California earthquakes

M1.7 earthquake 3 km WNW of Chester, California

A magnitude 1.7 earthquake struck 3 km WNW of Chester, California on Thu, May 30, 1985, 6:29 AM PDT (13:29 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M2.2 14 km NNE of Lake Davis, 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
1.7 (md), micro
Local time
UTC
1985-05-30 13:29:51 UTC
Depth
-1.2 km (-0.7 mi), shallow
Epicenter
40.320° N, 121.270° 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 5.7 km horizontally, 5.5 km in depth
Depth from
From location
Station coverage gap
279°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 2.214 km NNE of Lake Davis, California · 15089 days ago · 11 km deep · 80 km away
  2. 2.5Northern California · 15089 days ago · 5 km deep · 79 km away
  3. 1.814 km NNE of Mineral, California · 15087 days ago · 3 km deep · 26 km away
  4. 2.44 km S of Oroville East, California · 15086 days ago · 2 km deep · 96 km away
  5. 1.915 km E of Cottonwood, California · 15081 days ago · 11 km deep · 71 km away
  6. 2.56 km N of Millville, California · 15079 days ago · 23 km deep · 82 km away
  7. 2.310 km NE of Vina, California · 15077 days ago · -1 km deep · 69 km away
  8. 1.73 km NNW of Hamilton City, California · 15076 days ago · 10 km deep · 89 km away
  9. 1.85 km E of Redding, California · 15076 days ago · 19 km deep · 94 km away
  10. 1.614 km NNW of Chester, California · 15075 days ago · 6 km deep · 12 km away
  11. 1.56 km WNW of Lake Almanor West, California · 15073 days ago · 9 km deep · 8 km away
  12. 2.316 km SSW of Paynes Creek, California · 15070 days ago · 10 km deep · 63 km away
  13. 1.66 km NNE of Cohasset, California · 15067 days ago · 3 km deep · 53 km away
  14. 1.724 km NE of Old Station, California · 15065 days ago · 6 km deep · 56 km away
  15. 1.613 km NE of Vina, California · 15060 days ago · 11 km deep · 66 km away
  16. 1.812 km ESE of Mineral, California · 15057 days ago · 9 km deep · 16 km away
  17. 1.87 km SSW of Hat Creek, California · 15050 days ago · 2 km deep · 56 km away
  18. 2.28 km WSW of Hamilton City, California · 15049 days ago · 16 km deep · 99 km away
  19. 1.78 km SSW of Hat Creek, California · 15045 days ago · 1 km deep · 55 km away
  20. 2.14 km S of Hamilton City, California · 15045 days ago · 13 km deep · 94 km away
  21. 1.812 km WSW of Durham, California · 15039 days ago · 18 km deep · 97 km away
  22. 2.85 km NNE of Belden, California · 15038 days ago · -1 km deep · 30 km away
  23. 2.34 km NNE of East Quincy, California · 15038 days ago · 7 km deep · 52 km away
  24. 2.0Northern California · 15037 days ago · 2 km deep · 44 km away
  25. 3.14 km NNE of Belden, California · 15037 days ago · -1 km deep · 30 km away
  26. 1.89 km NW of Cohasset, California · 15032 days ago · 6 km deep · 59 km away
  27. 1.79 km NW of Cohasset, California · 15032 days ago · -1 km deep · 58 km away

Before

  1. 2.013 km NNW of Belden, California · 15093 days ago · 3 km deep · 23 km away
  2. 1.78 km WSW of Lake Almanor West, California · 15094 days ago · 11 km deep · 12 km away
  3. 1.912 km E of Westwood, California · 15096 days ago · 3 km deep · 35 km away
  4. 2.03 km NE of East Quincy, California · 15096 days ago · 4 km deep · 53 km away
  5. 2.00 km NE of Butte Meadows, California · 15099 days ago · 3 km deep · 35 km away
  6. 1.716 km NE of Mineral, California · 15103 days ago · 4 km deep · 24 km away
  7. 2.613 km ESE of Mineral, California · 15106 days ago · 8 km deep · 15 km away
  8. 1.78 km WSW of Red Bluff, California · 15107 days ago · 17 km deep · 92 km away
  9. 2.412 km ENE of Shingletown, California · 15108 days ago · 35 km deep · 46 km away
  10. 2.31 km SW of Lake Almanor West, California · 15111 days ago · 3 km deep · 11 km away
  11. 1.912 km ENE of Bend, California · 15116 days ago · 7 km deep · 68 km away
  12. 1.710 km E of Red Bluff, California · 15117 days ago · 3 km deep · 74 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc49314. Read Tue, Sep 22, 2026, 8:45 PM UTC.