QuakeIndex

Earthquake · automatic estimate, may change

M 2.8md

9 km WSW of Manton, CA

· 10 km deep · released about 530 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 38 kmShasta County 40 kmButte County 88 kmGlenn County 96 kmTrinity County 101 kmPlumas County 107 kmLassen County 119 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 2.8 (md)
Depth
10 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Tehama County, 38 km SW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 261 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 530 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 29,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 20,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.8× the energy of this one
  4. This earthquake M 2.8 about 530 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 40.4028, -121.9692. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 38 km (24 mi) NE of here earthquakes near Tehama County
Shasta County, CA 40 km (25 mi) S of here earthquakes near Shasta County
Butte County, CA 88 km (55 mi) NNW of here earthquakes near Butte County
Glenn County, CA 96 km (60 mi) NNE of here earthquakes near Glenn County
Trinity County, CA 101 km (62 mi) ESE of here earthquakes near Trinity County
Plumas County, CA 107 km (67 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

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

  1. 1.9 2 km NNE of Palo Cedro, CA
  2. 2.1 1 km ESE of Palo Cedro, CA
  3. 1.9 2 km ENE of Palo Cedro, CA
  4. 1.9 1 km ENE of Palo Cedro, CA
  5. 1.9 3 km S of Palo Cedro, CA
  6. 1.6 10 km NNE of Mineral, CA
  7. 1.9 5 km WNW of Shasta Lake, CA
  8. 1.9 4 km WSW of Shasta Lake, CA
  9. 1.9 10 km SW of Manton, CA
  10. 1.6 13 km NE of Mineral, CA
  11. 1.6 3 km NE of Mineral, CA
  12. 1.8 14 km NNW of Viola, CA
  13. 2.0 4 km NNW of Millville, CA
  14. 1.8 15 km W of Round Mountain, CA
  15. 1.9 2 km N 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.