QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

22km NE of Viola, CA

· 2.6 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 48 kmLassen County 74 kmTehama County 86 kmPlumas County 93 kmButte County 110 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 1.6 (md)
Depth
2.6 km below the surface
Felt
no reports yet
Nearest
Shasta County, 48 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2282 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 6.4 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 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 40.6538, -121.4917. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 48 km (30 mi) ESE of here earthquakes near Shasta County
Lassen County, CA 74 km (46 mi) W of here earthquakes near Lassen County
Tehama County, CA 86 km (53 mi) NE of here earthquakes near Tehama County
Plumas County, CA 93 km (58 mi) NW of here earthquakes near Plumas County
Butte County, CA 110 km (69 mi) N of here earthquakes near Butte County
Modoc County, CA 123 km (76 mi) SSW of here earthquakes near Modoc County

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

Aftershocks so far

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

  1. 1.6 25km NNE of Hamilton Branch, CA
  2. 1.7 2km NE of Chester, CA
  3. 2.0 10km WNW of Viola, CA
  4. 2.1 9km NNE of Burney, CA
  5. 1.8 14km NNW of Viola, CA
  6. 2.3 9km ENE of Viola, CA
  7. 2.0 2km ENE of Montgomery Creek, CA
  8. 2.2 14km NNE of Mineral, CA
  9. 1.8 14km NNE of Mineral, CA
  10. 1.5 12km W of Shingletown, CA
  11. 1.5 16km NNW of Shingletown, CA
  12. 2.5 13km N of Viola, CA
  13. 1.5 11km SW of Chester, CA
  14. 1.8 13km NNE of Shingletown, CA
  15. 1.6 19km NW of Viola, 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.