QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

8km NW of Chester, CA

· 9.5 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 57 kmLassen County 71 kmShasta County 77 kmButte County 80 kmTehama County 82 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 1.9 (md)
Depth
9.5 km below the surface
Felt
no reports yet
Nearest
Plumas County, 57 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2070 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 40.3485, -121.3052. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 57 km (35 mi) NW of here earthquakes near Plumas County
Lassen County, CA 71 km (44 mi) SW of here earthquakes near Lassen County
Shasta County, CA 77 km (48 mi) SE of here earthquakes near Shasta County
Butte County, CA 80 km (50 mi) NNE of here earthquakes near Butte County
Tehama County, CA 82 km (51 mi) ENE of here earthquakes near Tehama County
Sierra County, CA 109 km (68 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

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

  1. 1.5 12km ESE of Viola, CA
  2. 2.0 9km WSW of Chester, CA
  3. 1.5 12km ESE of Viola, CA
  4. 2.2 4km ENE of Prattville, CA
  5. 1.9 10km WSW of Chester, CA
  6. 1.6 15km NNE of Mineral, CA
  7. 1.9 12km ESE of Viola, CA
  8. 1.6 3km S of East Shore, CA
  9. 1.9 9km W of Caribou, CA
  10. 1.6 15km SSW of Mineral, CA
  11. 1.6 15km SSW of Mineral, CA
  12. 1.6 10km NNE of Mineral, CA
  13. 1.6 11km NNE of Mineral, CA
  14. 1.7 11km NNE of Mineral, CA
  15. 1.5 10km 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.

On USGS

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