QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

8km N of Viola, CA

· 3.5 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 37 kmTehama County 70 kmLassen County 90 kmPlumas County 97 kmButte County 103 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
3.5 km below the surface
Felt
no reports yet
Nearest
Shasta County, 37 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1643 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 22 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 5.8 680,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 480,000× the energy of this one
  3. Around the size people start to feel M 3.0 43× the energy of this one
  4. This earthquake M 1.9 about 22 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 40.5865, -121.6695. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 37 km (23 mi) ESE of here earthquakes near Shasta County
Tehama County, CA 70 km (43 mi) NE of here earthquakes near Tehama County
Lassen County, CA 90 km (56 mi) W of here earthquakes near Lassen County
Plumas County, CA 97 km (61 mi) NW of here earthquakes near Plumas County
Butte County, CA 103 km (64 mi) N of here earthquakes near Butte County
Glenn County, CA 126 km (78 mi) NNE of here earthquakes near Glenn County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.7 18km NW of Chester, CA
  2. 1.9 16km NW of Chester, CA
  3. 1.9 16km NW of Chester, CA
  4. 1.9 17km NW of Chester, CA
  5. 1.6 4km ESE of Bella Vista, CA
  6. 2.8 6km SE of Viola, CA
  7. 1.7 21km S of Mineral, CA
  8. 1.7 22km SSE of Mineral, CA
  9. 2.1 12km N of Mineral, CA
  10. 1.5 12km ESE of Viola, CA
  11. 2.5 11km N of Mineral, CA
  12. 1.6 14km NNW of Chester, CA
  13. 1.6 11km S of Manton, CA
  14. 1.7 11km WNW of Chester, CA
  15. 1.9 17km S 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.