QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6km NNW of Greenville, CA

· 7.7 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 25 kmLassen County 67 kmSierra County 78 kmButte County 78 kmNevada County 100 kmYuba County 106 kmTehama County 106 kmShasta County 110 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
7.7 km below the surface
Felt
no reports yet
Nearest
Plumas County, 25 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2257 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 47 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 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 40.1840, -120.9840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 25 km (16 mi) NNW of here earthquakes near Plumas County
Lassen County, CA 67 km (41 mi) SSW of here earthquakes near Lassen County
Sierra County, CA 78 km (49 mi) NNW of here earthquakes near Sierra County
Butte County, CA 78 km (49 mi) NE of here earthquakes near Butte County
Nevada County, CA 100 km (62 mi) N of here earthquakes near Nevada County
Yuba County, CA 106 km (66 mi) NNE of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 1.6 25km NNE of Hamilton Branch, CA
  2. 1.7 2km NE of Chester, CA
  3. 1.8 18km WSW of Almanor, CA
  4. 2.2 3km ENE of Canyondam, CA
  5. 1.9 5km NNE of Almanor, CA
  6. 1.7 2 km ENE of East Quincy, California
  7. 1.5 11km SW of Chester, CA
  8. 2.6 4km NNE of Almanor, CA
  9. 1.5 6km NNE of Almanor, CA
  10. 2.0 8km NNW of Chester, CA
  11. 1.5 7km ENE of Mineral, CA
  12. 1.6 3km S of Canyondam, CA
  13. 1.7 12km SE of Mineral, CA
  14. 2.0 6km N of Greenhorn, CA
  15. 1.8 3km N of Spring Garden, 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.