QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

1km WSW of Canyondam, CA

· -1.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 29 kmButte County 71 kmLassen County 73 kmSierra County 81 kmTehama County 97 kmNevada County 100 kmYuba County 102 kmShasta County 105 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 1.8 (md)
Depth
-1.7 km below the surface
Felt
no reports yet
Nearest
Plumas County, 29 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3180 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 40.1653, -121.0863. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 29 km (18 mi) NW of here earthquakes near Plumas County
Butte County, CA 71 km (44 mi) NE of here earthquakes near Butte County
Lassen County, CA 73 km (45 mi) SSW of here earthquakes near Lassen County
Sierra County, CA 81 km (50 mi) NW of here earthquakes near Sierra County
Tehama County, CA 97 km (61 mi) E of here earthquakes near Tehama County
Nevada County, CA 100 km (62 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

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

  1. 1.5 6 km SW of Canyondam, California
  2. 2.2 3km SE of Belden, CA
  3. 1.5 3 km SSW of Greenville, California
  4. 1.5 8km NNW of Chester, CA
  5. 2.9 3km NNE of Almanor, CA
  6. 2.3 4km NNE of Almanor, CA
  7. 1.8 5km SSW of Cromberg, CA
  8. 2.2 16km W of Almanor, CA
  9. 2.0 3km WSW of Cromberg, CA
  10. 1.6 2km SW of Cromberg, CA
  11. 1.6 9km N of Spring Garden, CA
  12. 2.0 2km NE of Canyondam, CA
  13. 1.7 2km NNE of Prattville, CA
  14. 1.8 16km WSW of Almanor, CA
  15. 2.3 3km ENE of Greenhorn, 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.