QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

6 km WNW of Sierra City, California

· -1.3 km deep · released about 52 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 16 kmNevada County 32 kmPlumas County 47 kmPlacer County 58 kmYuba County 65 kmButte County 77 kmEl Dorado County 90 kmCarson City 96 kmStorey County 103 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.2 (md)
Depth
-1.3 km below the surface
Felt
no reports yet
Nearest
Sierra County, 16 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3355 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 52 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 290,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 200,000× the energy of this one
  3. Around the size people start to feel M 3.0 18× the energy of this one
  4. This earthquake M 2.2 about 52 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 39.5833, -120.7100. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 16 km (10 mi) W of here earthquakes near Sierra County
Nevada County, CA 32 km (20 mi) N of here earthquakes near Nevada County
Plumas County, CA 47 km (29 mi) SSE of here earthquakes near Plumas County
Placer County, CA 58 km (36 mi) N of here earthquakes near Placer County
Yuba County, CA 65 km (40 mi) ENE of here earthquakes near Yuba County
Butte County, CA 77 km (48 mi) E of here earthquakes near Butte County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

56 earthquakes have been recorded within 50 km since this one.

  1. 1.9 3km W of Delleker, CA
  2. 1.8 5km SSW of Cromberg, CA
  3. 1.8 10km NNE of Lake Davis, CA
  4. 1.6 4km WSW of Johnsville, CA
  5. 2.0 3km WSW of Cromberg, CA
  6. 1.5 18km SSW of Whitehawk, CA
  7. 1.6 2km SW of Cromberg, CA
  8. 2.1 5km NNE of Lake Davis, CA
  9. 1.9 5km NNE of Lake Davis, CA
  10. 1.6 9km N of Spring Garden, CA
  11. 2.0 9km NNW of Loyalton, CA
  12. 2.3 3km ENE of Greenhorn, CA
  13. 1.8 10km NNE of Greenhorn, CA
  14. 2.0 13 km NNE of Soda Springs, California
  15. 2.6 9km NNW of Loyalton, CA

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.