QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

16km NW of Chester, CA

· 7.4 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 65 kmShasta County 69 kmLassen County 73 kmTehama County 78 kmButte County 83 kmSierra County 117 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
7.4 km below the surface
Felt
no reports yet
Nearest
Plumas County, 65 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2584 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 38 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 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 40.3945, -121.3817. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 65 km (40 mi) NW of here earthquakes near Plumas County
Shasta County, CA 69 km (43 mi) SE of here earthquakes near Shasta County
Lassen County, CA 73 km (46 mi) WSW of here earthquakes near Lassen County
Tehama County, CA 78 km (49 mi) ENE of here earthquakes near Tehama County
Butte County, CA 83 km (52 mi) NNE of here earthquakes near Butte County
Sierra County, CA 117 km (73 mi) NW of here earthquakes near Sierra County

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

Aftershocks so far

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

  1. 2.2 12km ESE of Viola, CA
  2. 1.6 22km NE of Viola, CA
  3. 2.0 14km NNE of Mineral, CA
  4. 1.8 11km NW of Viola, CA
  5. 1.6 30km NNE of Hamilton Branch, CA
  6. 1.6 4km NNE of Belden, CA
  7. 1.5 15km ENE of East Shore, CA
  8. 1.7 5km NE of Canyondam, CA
  9. 1.7 14km SW of Almanor, CA
  10. 1.6 3km SSW of East Shore, CA
  11. 1.5 4km NNW of Almanor, CA
  12. 2.3 4km N of Almanor, CA
  13. 1.8 20km WNW of Susanville, CA
  14. 1.8 3km NNE of Prattville, CA
  15. 1.6 15km NNE of Shingletown, 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.