California earthquakes

M2.1 earthquake 6km SW of Cromberg, CA

A magnitude 2.1 earthquake struck 6km SW of Cromberg, CA on Wed, Oct 27, 2021, 5:16 AM PDT (12:16 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M2.8 2km NE of Almanor, CA. This one was a foreshock.

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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
2021-10-27 12:16:13 UTC
Depth
2.2 km (1.4 mi), shallow
Epicenter
39.828° N, 120.763° 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, 3.9 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
69°
Stations used
14

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 9 in the 30 days before it.

After

  1. 2.13km NNE of Chester, CA · 1803 days ago · 8 km deep · 69 km away
  2. 1.83km NNE of Chester, CA · 1802 days ago · 10 km deep · 68 km away
  3. 2.75km ENE of East Quincy, CA · 1801 days ago · 5 km deep · 15 km away · felt by 7
  4. 1.514 km NNW of Sutcliffe, Nevada · 1797 days ago · 14 km deep · 96 km away
  5. 2.13km NNE of Chester, CA · 1797 days ago · 9 km deep · 68 km away
  6. 2.215km SE of Honey Lake, CA · 1787 days ago · 3 km deep · 59 km away
  7. 2.23km WSW of Cromberg, CA · 1786 days ago · -2 km deep · 4 km away
  8. 2.16km N of Tahoe Vista, CA · 1786 days ago · -1 km deep · 85 km away
  9. 2.314 km NNW of Sutcliffe, Nevada · 1785 days ago · 11 km deep · 97 km away
  10. 1.69km S of Mineral, CA · 1780 days ago · 14 km deep · 84 km away
  11. 2.82km NE of Almanor, CA · 1779 days ago · 8 km deep · 56 km away · felt by 5
  12. 1.612km N of Mineral, CA · 1775 days ago · 4 km deep · 97 km away
  13. 1.77km SSE of Mineral, CA · 1773 days ago · 12 km deep · 85 km away
  14. 1.612km W of Chester, CA · 1773 days ago · 7 km deep · 72 km away
  15. 1.58km SSE of Mineral, CA · 1772 days ago · 10 km deep · 84 km away
  16. 1.712km WSW of Chester, CA · 1772 days ago · 7 km deep · 72 km away
  17. 2.416km SSE of Mineral, CA · 1772 days ago · 6 km deep · 76 km away
  18. 1.66 km ENE of Floriston, California · 1772 days ago · 9 km deep · 83 km away
  19. 1.53 km SSE of Greenhorn, California · 1767 days ago · 10 km deep · 6 km away
  20. 2.52km ENE of Prattville, CA · 1760 days ago · 5 km deep · 54 km away · felt by 1
  21. 2.82km ENE of Prattville, CA · 1760 days ago · 6 km deep · 54 km away · felt by 10
  22. 1.62km E of Prattville, CA · 1760 days ago · 4 km deep · 53 km away
  23. 2.014km SSW of Loyalton, CA · 1752 days ago · 4 km deep · 48 km away
  24. 2.421km SSE of Mineral, CA · 1747 days ago · 15 km deep · 73 km away · felt by 2
  25. 1.521 km NNW of Sutcliffe, Nevada · 1744 days ago · 7 km deep · 100 km away

Before

  1. 2.114km ESE of Viola, CA · 1805 days ago · 4 km deep · 97 km away
  2. 3.114km SSW of Loyalton, CA · 1807 days ago · 6 km deep · 49 km away · felt by 16
  3. 1.913km WSW of Almanor, CA · 1817 days ago · 9 km deep · 61 km away
  4. 1.78 km NNW of Sutcliffe, Nevada · 1818 days ago · 7 km deep · 98 km away
  5. 2.029 km NW of Sutcliffe, Nevada · 1823 days ago · 4 km deep · 91 km away
  6. 1.99km WSW of Chester, CA · 1829 days ago · 4 km deep · 69 km away
  7. 1.512km ESE of Viola, CA · 1829 days ago · 4 km deep · 97 km away
  8. 2.09km WSW of Chester, CA · 1830 days ago · 1 km deep · 69 km away
  9. 1.512km ESE of Viola, CA · 1831 days ago · 3 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73645455. Read Sun, Oct 4, 2026, 11:03 PM UTC.