QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

2km SW of Spring Garden, CA

· -1.4 km deep · released about 37 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 11 kmSierra County 44 kmNevada County 67 kmButte County 72 kmYuba County 83 kmLassen County 92 kmPlacer County 93 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 2.1 (md)
Depth
-1.4 km below the surface
Felt
no reports yet
Nearest
Plumas County, 11 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2952 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 37 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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 39.8972, -120.8160. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 11 km (7 mi) S of here earthquakes near Plumas County
Sierra County, CA 44 km (27 mi) NW of here earthquakes near Sierra County
Nevada County, CA 67 km (42 mi) N of here earthquakes near Nevada County
Butte County, CA 72 km (45 mi) ENE of here earthquakes near Butte County
Yuba County, CA 83 km (52 mi) NNE of here earthquakes near Yuba County
Lassen County, CA 92 km (57 mi) S of here earthquakes near Lassen County

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

Aftershocks so far

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

  1. 1.8 4km ESE of Taylorsville, CA
  2. 1.7 7km WSW of Greenville, CA
  3. 1.5 9 km N of Greenhorn, California
  4. 1.5 3 km SE of Canyondam, California
  5. 1.8 9 km NW of Loyalton, California
  6. 2.2 5km SE of Taylorsville, CA
  7. 1.8 4km SE of Taylorsville, CA
  8. 2.9 4km SE of Taylorsville, CA
  9. 1.8 5km SE of Taylorsville, CA
  10. 1.6 4 km SSE of Taylorsville, California
  11. 1.6 5km NNE of Caribou, CA
  12. 1.6 4km NNE of Caribou, CA
  13. 1.5 9 km S of Taylorsville, California
  14. 2.1 0km ENE of Canyondam, CA
  15. 1.7 8 km NNE of Calpine, California

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.