QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

17km NNW of Viola, CA

· 11 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 25 kmTehama County 70 kmLassen County 98 kmPlumas County 109 kmButte County 111 kmTrinity County 112 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
11 km below the surface
Felt
no reports yet
Nearest
Shasta County, 25 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2446 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 40.6502, -121.7817. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 25 km (16 mi) ESE of here earthquakes near Shasta County
Tehama County, CA 70 km (43 mi) NNE of here earthquakes near Tehama County
Lassen County, CA 98 km (61 mi) W of here earthquakes near Lassen County
Plumas County, CA 109 km (68 mi) NW of here earthquakes near Plumas County
Butte County, CA 111 km (69 mi) N of here earthquakes near Butte County
Trinity County, CA 112 km (70 mi) E of here earthquakes near Trinity 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. 2.1 10km N of Viola, CA
  2. 2.8 10km N of Viola, CA
  3. 2.0 10km N of Viola, CA
  4. 1.6 12km NE of Bella Vista, CA
  5. 1.7 9km NE of Shasta Lake, CA
  6. 2.0 20km SSW of Manton, CA
  7. 1.6 12km NE of Bella Vista, CA
  8. 1.8 20km NE of Red Bluff, CA
  9. 2.7 18km NE of Red Bluff, CA
  10. 1.9 12km ENE of Mineral, CA
  11. 1.5 12km N of Mineral, CA
  12. 1.5 8km NE of Shasta Lake, CA
  13. 1.6 7km S of Mineral, CA
  14. 2.1 12km WSW of Shingletown, CA
  15. 1.7 10km NE of Shasta Lake, 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.