QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

4 km NNE of Canyondam, CA

· 8.6 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 30 kmLassen County 68 kmButte County 75 kmSierra County 83 kmTehama County 100 kmNevada County 103 kmShasta County 104 kmYuba County 106 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
8.6 km below the surface
Felt
no reports yet
Nearest
Plumas County, 30 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1147 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 49 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 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 40.1993, -121.0595. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 30 km (19 mi) NW of here earthquakes near Plumas County
Lassen County, CA 68 km (42 mi) SSW of here earthquakes near Lassen County
Butte County, CA 75 km (47 mi) NE of here earthquakes near Butte County
Sierra County, CA 83 km (52 mi) NNW of here earthquakes near Sierra County
Tehama County, CA 100 km (62 mi) E of here earthquakes near Tehama County
Nevada County, CA 103 km (64 mi) NNW of here earthquakes near Nevada 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. 2.3 2 km SSE of Prattville, CA
  2. 2.3 4 km N of Almanor, CA
  3. 2.4 2 km NNE of Almanor, CA
  4. 2.1 2 km WNW of East Shore, CA
  5. 2.4 2 km NE of Prattville, CA
  6. 2.0 0 km NNW of Prattville, CA
  7. 2.1 5 km SSW of Canyondam, CA
  8. 2.6 2 km NNE of Prattville, CA
  9. 1.9 4 km SW of Hamilton Branch, CA
  10. 1.8 2 km WNW of Canyondam, CA
  11. 2.0 2 km WNW of Canyondam, CA
  12. 2.0 20 km S of Mineral, CA
  13. 1.6 1 km N of Prattville, CA
  14. 1.9 1 km NNE of Prattville, CA
  15. 1.5 14 km NNE of Mineral, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.5 on 2023-05-11 — it released about 100,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.