QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

9km NW of Caribou, CA

· 5.8 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 39 kmButte County 60 kmLassen County 84 kmTehama County 84 kmSierra County 87 kmYuba County 96 kmShasta County 98 kmNevada County 101 kmGlenn County 115 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
5.8 km below the surface
Felt
no reports yet
Nearest
Plumas County, 39 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2385 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 40.1263, -121.2433. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 39 km (24 mi) WNW of here earthquakes near Plumas County
Butte County, CA 60 km (37 mi) NNE of here earthquakes near Butte County
Lassen County, CA 84 km (52 mi) SW of here earthquakes near Lassen County
Tehama County, CA 84 km (52 mi) E of here earthquakes near Tehama County
Sierra County, CA 87 km (54 mi) NW of here earthquakes near Sierra County
Yuba County, CA 96 km (59 mi) N 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. 1.9 8km NW of Chester, CA
  2. 2.2 9km NW of Chester, CA
  3. 1.9 9km NW of Chester, CA
  4. 2.4 1km NE of Twain, CA
  5. 1.5 4km N of Twain, CA
  6. 1.6 3km NW of Greenville, CA
  7. 1.5 7km NW of Indian Falls, CA
  8. 1.6 4km NNE of Almanor, CA
  9. 2.5 5km NNE of East Quincy, CA
  10. 1.6 3km ENE of Prattville, CA
  11. 1.9 8km WNW of Caribou, CA
  12. 1.5 1km WNW of Canyondam, CA
  13. 2.0 3km E of Prattville, CA
  14. 1.9 6km SE of Chester, CA
  15. 1.8 2km SSW of Canyondam, 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.