California earthquakes

M1.8 earthquake 4 km WSW of Cromberg, California

A magnitude 1.8 earthquake struck 4 km WSW of Cromberg, California on Sun, Jan 6, 1985, 5:39 AM PST (13:39 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.5 3 km S of Graeagle, California. This one was a foreshock.

Graeagle 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1985-01-06 13:39:07 UTC
Depth
4.5 km (2.8 mi), shallow
Epicenter
39.838° N, 120.735° 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 2.1 km horizontally, 9.1 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
326°, poorly surrounded by stations
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 2.00 km SSW of Twain, California · 15242 days ago · 7 km deep · 35 km away
  2. 1.65 km SE of Sierraville, California · 15238 days ago · -1 km deep · 47 km away
  3. 2.314 km NNW of Truckee, California · 15225 days ago · 10 km deep · 60 km away
  4. 2.03 km NNE of Lake Almanor West, California · 15225 days ago · 6 km deep · 62 km away
  5. 1.63 km ENE of Loma Rica, California · 15214 days ago · 1 km deep · 79 km away
  6. 1.512 km W of Chester, California · 15213 days ago · 3 km deep · 74 km away
  7. 1.64 km ESE of Palermo, California · 15212 days ago · 9 km deep · 80 km away
  8. 1.83 km NNW of Lake Almanor West, California · 15209 days ago · 3 km deep · 63 km away
  9. 1.72 km N of Lake Almanor West, California · 15206 days ago · 6 km deep · 61 km away
  10. 1.87 km NNE of Truckee, California · 15203 days ago · 6 km deep · 70 km away
  11. 1.816 km ENE of Mineral, California · 15202 days ago · 6 km deep · 87 km away
  12. 2.317 km ENE of Mineral, California · 15202 days ago · 6 km deep · 87 km away
  13. 1.617 km ENE of Mineral, California · 15202 days ago · 8 km deep · 88 km away
  14. 2.316 km ENE of Mineral, California · 15202 days ago · 3 km deep · 87 km away
  15. 1.817 km ENE of Mineral, California · 15202 days ago · 7 km deep · 88 km away
  16. 2.015 km SW of Lake Almanor West, California · 15196 days ago · 8 km deep · 60 km away
  17. 1.714 km NNE of Mineral, California · 15189 days ago · 3 km deep · 97 km away
  18. 2.53 km N of Plumas Eureka, California · 15186 days ago · -1 km deep · 7 km away
  19. 2.53 km S of Graeagle, California · 15185 days ago · 4 km deep · 15 km away

Before

  1. 1.94 km SSE of Sierraville, California · 15245 days ago · 0 km deep · 47 km away
  2. 1.94 km NNW of Alta Sierra, California · 15247 days ago · 10 km deep · 78 km away
  3. 1.511 km WSW of Chester, California · 15248 days ago · 5 km deep · 73 km away
  4. 2.18 km NNE of Truckee, California · 15249 days ago · 3 km deep · 71 km away
  5. 1.77 km WSW of Verdi, California · 15250 days ago · -1 km deep · 67 km away
  6. 2.01 km NE of Greenhorn, California · 15256 days ago · 8 km deep · 9 km away
  7. 1.614 km NNE of Mineral, California · 15261 days ago · 3 km deep · 99 km away
  8. 1.715 km N of Westwood, California · 15261 days ago · -2 km deep · 71 km away
  9. 2.32 km WSW of La Porte, California · 15263 days ago · 17 km deep · 30 km away
  10. 2.49 km E of Sierra City, California · 15266 days ago · -1 km deep · 36 km away
  11. 1.7Northern California · 15267 days ago · 4 km deep · 82 km away
  12. 2.12 km W of Paradise, California · 15273 days ago · 20 km deep · 79 km away
  13. 1.94 km SE of Canyondam, California · 15273 days ago · 2 km deep · 42 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc39912. Read Fri, Oct 2, 2026, 8:19 PM UTC.