QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

12km ESE of Viola, CA

· 3.0 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 53 kmTehama County 69 kmPlumas County 81 kmLassen County 83 kmButte County 89 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
3.0 km below the surface
Felt
no reports yet
Nearest
Shasta County, 53 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1824 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 5.9 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 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 40.4678, -121.5492. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 53 km (33 mi) SE of here earthquakes near Shasta County
Tehama County, CA 69 km (43 mi) ENE of here earthquakes near Tehama County
Plumas County, CA 81 km (50 mi) NW of here earthquakes near Plumas County
Lassen County, CA 83 km (52 mi) WSW of here earthquakes near Lassen County
Butte County, CA 89 km (56 mi) N of here earthquakes near Butte County
Glenn County, CA 121 km (75 mi) NE of here earthquakes near Glenn 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. 2.4 11km WNW of Chester, CA
  2. 1.6 9km NE of Shingletown, CA
  3. 2.4 9km WSW of Shingletown, CA
  4. 1.9 8km N of Viola, CA
  5. 1.6 8km N of Viola, CA
  6. 2.0 5km NE of Hamilton Branch, CA
  7. 2.1 3km SW of East Shore, CA
  8. 2.4 3km S of Manton, CA
  9. 1.6 9km WSW of Almanor, CA
  10. 1.6 14km NNE of Mineral, CA
  11. 1.8 14km W of Almanor, CA
  12. 1.9 13km ENE of Viola, CA
  13. 1.5 4km NNE of Prattville, CA
  14. 1.5 14km ESE of Viola, CA
  15. 1.6 4km ESE of Chester, 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.