QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

3km NE of Viola, CA

· 5.8 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 41 kmTehama County 67 kmLassen County 89 kmPlumas County 93 kmButte County 98 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
5.8 km below the surface
Felt
no reports yet
Nearest
Shasta County, 41 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1768 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 19 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 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 40.5417, -121.6523. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 41 km (25 mi) SE of here earthquakes near Shasta County
Tehama County, CA 67 km (42 mi) NE of here earthquakes near Tehama County
Lassen County, CA 89 km (55 mi) WSW of here earthquakes near Lassen County
Plumas County, CA 93 km (58 mi) NW of here earthquakes near Plumas County
Butte County, CA 98 km (61 mi) N of here earthquakes near Butte County
Glenn County, CA 122 km (76 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. 1.6 15km E of Viola, CA
  2. 1.8 4km NNE of Viola, CA
  3. 1.8 24km S of Manton, CA
  4. 1.6 16km SSE of Manton, CA
  5. 2.4 14km NNE of Shingletown, CA
  6. 1.7 11km W of Shingletown, CA
  7. 1.9 20km NE of Red Bluff, CA
  8. 2.5 10km WNW of Chester, CA
  9. 2.4 11km WNW of Chester, CA
  10. 1.6 9km NE of Shingletown, CA
  11. 2.4 9km WSW of Shingletown, CA
  12. 1.9 8km N of Viola, CA
  13. 1.5 5km N of Millville, CA
  14. 1.6 8km N of Viola, CA
  15. 1.6 9km SE of Millville, 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.