QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

4 km W of Calpine, California

· 10 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 10 kmPlumas County 46 kmNevada County 47 kmPlacer County 70 kmYuba County 85 kmCarson City 86 kmStorey County 87 kmButte County 95 kmEl Dorado County 98 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 2.4 (md)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Sierra County, 10 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3009 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 39.6633, -120.4943. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 10 km (6 mi) NNE of here earthquakes near Sierra County
Plumas County, CA 46 km (29 mi) SE of here earthquakes near Plumas County
Nevada County, CA 47 km (29 mi) NNE of here earthquakes near Nevada County
Placer County, CA 70 km (43 mi) NNE of here earthquakes near Placer County
Yuba County, CA 85 km (53 mi) ENE of here earthquakes near Yuba County
Carson City, NV 86 km (53 mi) NW of here earthquakes near Carson City

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

Aftershocks so far

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

  1. 1.6 4km WSW of Johnsville, CA
  2. 2.0 3km WSW of Cromberg, CA
  3. 1.5 18km SSW of Whitehawk, CA
  4. 1.6 2km SW of Cromberg, CA
  5. 2.1 5km NNE of Lake Davis, CA
  6. 1.9 5km NNE of Lake Davis, CA
  7. 1.6 9km N of Spring Garden, CA
  8. 2.0 9km NNW of Loyalton, CA
  9. 2.3 3km ENE of Greenhorn, CA
  10. 1.7 18km NNE of Chilcoot-Vinton, CA
  11. 2.1 12 km E of Chilcoot-Vinton, California
  12. 1.8 10km NNE of Greenhorn, CA
  13. 2.5 17km NNE of Chilcoot-Vinton, 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.