QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

5 km SSW of Shasta, CA

· 22 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 45 kmTrinity County 52 kmTehama County 53 kmGlenn County 106 kmSiskiyou 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 2.1 (md)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Shasta County, 45 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 733 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 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 40.5557, -122.5097. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 45 km (28 mi) WSW of here earthquakes near Shasta County
Trinity County, CA 52 km (32 mi) E of here earthquakes near Trinity County
Tehama County, CA 53 km (33 mi) NNW of here earthquakes near Tehama County
Glenn County, CA 106 km (66 mi) N of here earthquakes near Glenn County
Siskiyou County, CA 115 km (71 mi) S of here earthquakes near Siskiyou County
Humboldt County, CA 121 km (75 mi) E of here earthquakes near Humboldt County

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

Aftershocks so far

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

  1. 1.7 8 km NE of Shasta Lake, CA
  2. 2.4 12 km W of Shingletown, CA
  3. 1.8 6 km NNE of Shasta Lake, CA
  4. 1.6 19 km ENE of Red Bluff, CA
  5. 1.7 8 km NE of Shasta Lake, CA
  6. 1.6 6 km NNW of Redding, CA
  7. 1.9 2 km WNW of Shasta Lake, CA
  8. 2.7 6 km E of Shasta, CA
  9. 2.0 6 km NW of Redding, CA
  10. 2.0 6 km NW of Redding, CA
  11. 3.6 5 km NW of Redding, CA
  12. 1.8 9 km NE of Shasta Lake, CA
  13. 2.0 4 km W of Redding, CA
  14. 2.4 15 km W of Manton, CA
  15. 1.8 6 km E of Shasta, 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.