QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

8km NNW of Chester, CA

· 3.1 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 56 kmLassen County 66 kmShasta County 79 kmButte County 84 kmTehama County 87 kmSierra County 109 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 1.5 (md)
Depth
3.1 km below the surface
Felt
no reports yet
Nearest
Plumas County, 56 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3012 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 40.3760, -121.2553. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 56 km (35 mi) NW of here earthquakes near Plumas County
Lassen County, CA 66 km (41 mi) SW of here earthquakes near Lassen County
Shasta County, CA 79 km (49 mi) ESE of here earthquakes near Shasta County
Butte County, CA 84 km (52 mi) NNE of here earthquakes near Butte County
Tehama County, CA 87 km (54 mi) ENE of here earthquakes near Tehama County
Sierra County, CA 109 km (67 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

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

  1. 1.6 5km NNE of Caribou, CA
  2. 1.6 4km NNE of Caribou, CA
  3. 2.1 0km ENE of Canyondam, CA
  4. 1.6 2km SE of Twain, CA
  5. 1.8 15km E of Viola, CA
  6. 1.8 15km E of Viola, CA
  7. 2.0 10km WSW of Susanville, CA
  8. 1.7 14km WSW of Susanville, CA
  9. 2.0 9km SW of Susanville, CA
  10. 2.5 10km WSW of Susanville, CA
  11. 1.6 15km S of Mineral, CA
  12. 1.5 2km NW of Almanor, CA
  13. 1.7 4km NNW of Canyondam, CA
  14. 1.6 42km SE of Fall River Mills, CA
  15. 1.7 7km WSW of Almanor, 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.