QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

20km NE of Red Bluff, CA

· 13 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 25 kmShasta County 49 kmButte County 84 kmGlenn County 84 kmTrinity County 94 kmPlumas County 114 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 1.8 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Tehama County, 25 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2140 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 40.3228, -122.0902. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 25 km (16 mi) NNE of here earthquakes near Tehama County
Shasta County, CA 49 km (30 mi) S of here earthquakes near Shasta County
Butte County, CA 84 km (52 mi) NNW of here earthquakes near Butte County
Glenn County, CA 84 km (52 mi) NNE of here earthquakes near Glenn County
Trinity County, CA 94 km (58 mi) ESE of here earthquakes near Trinity County
Plumas County, CA 114 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

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

  1. 1.5 1km NW of Palo Cedro, CA
  2. 1.6 3km WSW of Shasta Lake, CA
  3. 1.5 1km NW of Palo Cedro, CA
  4. 1.6 1km SW of Palo Cedro, CA
  5. 1.7 2km WSW of Palo Cedro, CA
  6. 1.6 2km W of Palo Cedro, CA
  7. 1.5 6km ESE of Bella Vista, CA
  8. 1.6 15km SSW of Mineral, CA
  9. 1.6 15km SSW of Mineral, CA
  10. 1.6 8km NE of Shasta Lake, CA
  11. 2.0 18km ESE of Anderson, CA
  12. 1.7 4km SSE of Mineral, CA
  13. 1.5 14km N of Shingletown, CA
  14. 1.6 2km E of Palo Cedro, CA
  15. 1.5 6km NNE 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.