QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

5km SE of Chester, CA

· 6.3 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 44 kmLassen County 69 kmButte County 76 kmTehama County 89 kmShasta County 90 kmSierra County 96 kmYuba County 112 kmNevada County 114 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
6.3 km below the surface
Felt
no reports yet
Nearest
Plumas County, 44 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2755 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 40.2703, -121.1958. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 44 km (27 mi) NW of here earthquakes near Plumas County
Lassen County, CA 69 km (43 mi) SW of here earthquakes near Lassen County
Butte County, CA 76 km (47 mi) NNE of here earthquakes near Butte County
Tehama County, CA 89 km (56 mi) E of here earthquakes near Tehama County
Shasta County, CA 90 km (56 mi) SE of here earthquakes near Shasta County
Sierra County, CA 96 km (60 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

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

  1. 2.2 15km WSW of Chester, CA
  2. 2.0 18km SSE of Mineral, CA
  3. 1.5 2km SW of Canyondam, CA
  4. 2.3 15km NNW of Susanville, CA
  5. 1.7 3km N of Almanor, CA
  6. 2.8 1km WNW of Twain, CA
  7. 2.4 4km ESE of Prattville, CA
  8. 1.6 3km NE of Almanor, CA
  9. 2.3 10km ESE of Taylorsville, CA
  10. 1.7 10km WSW of Chester, CA
  11. 1.9 5km WSW of Greenville, CA
  12. 1.5 3 km N of Indian Falls, California
  13. 1.9 10km WSW of Chester, CA
  14. 1.5 4km S of East Shore, CA
  15. 1.8 6km WSW of Belden, 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.