QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

21km SE of Anderson, CA

· 12 km deep · released about 23 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 26 kmShasta County 47 kmGlenn County 86 kmButte County 86 kmTrinity County 92 kmPlumas County 115 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
12 km below the surface
Felt
no reports yet
Nearest
Tehama County, 26 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1992 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 23 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 5.8 660,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 470,000× the energy of this one
  3. Around the size people start to feel M 3.0 42× the energy of this one
  4. This earthquake M 1.9 about 23 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 40.3398, -122.0997. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 26 km (16 mi) NNE of here earthquakes near Tehama County
Shasta County, CA 47 km (29 mi) S of here earthquakes near Shasta County
Glenn County, CA 86 km (53 mi) NNE of here earthquakes near Glenn County
Butte County, CA 86 km (53 mi) NNW of here earthquakes near Butte County
Trinity County, CA 92 km (57 mi) ESE of here earthquakes near Trinity County
Plumas County, CA 115 km (71 mi) WNW of here earthquakes near Plumas County

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

Aftershocks so far

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

  1. 1.6 8km NNW of Bella Vista, CA
  2. 1.8 8km NNW of Bella Vista, CA
  3. 1.5 6km NNE of Millville, CA
  4. 1.9 9km ESE of Millville, CA
  5. 1.8 11km ESE of Millville, CA
  6. 1.6 7km WSW of Shingletown, CA
  7. 2.3 9km WSW of Shingletown, CA
  8. 1.8 10km ESE of Millville, CA
  9. 1.7 1km NE of Shasta Lake, CA
  10. 1.7 13km NNE of Shingletown, CA
  11. 1.7 11km NNE of Bella Vista, CA
  12. 1.7 7km SSE of Mineral, CA
  13. 1.9 3km NE of Viola, CA
  14. 2.3 6km ENE of Shasta, CA
  15. 1.6 9km 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.