QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

12km NNE of Shasta Lake, CA

· 21 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 23 kmTrinity County 69 kmTehama County 73 kmSiskiyou County 92 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
21 km below the surface
Felt
no reports yet
Nearest
Shasta County, 23 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1926 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 44 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 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 40.7752, -122.3150. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 23 km (14 mi) W of here earthquakes near Shasta County
Trinity County, CA 69 km (43 mi) ENE of here earthquakes near Trinity County
Tehama County, CA 73 km (45 mi) N of here earthquakes near Tehama County
Siskiyou County, CA 92 km (57 mi) SSE of here earthquakes near Siskiyou County

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

Aftershocks so far

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

  1. 1.9 11km NW of Shasta Lake, CA
  2. 1.7 2km NE of Shasta Lake, CA
  3. 1.6 2km ENE of Shasta Lake, CA
  4. 2.7 6km ENE of Shasta, CA
  5. 1.9 23km N of Shasta Lake, CA
  6. 1.8 6km NNE of Millville, CA
  7. 1.6 15km W of Round Mountain, CA
  8. 1.6 8km NNW of Bella Vista, CA
  9. 1.8 8km NNW of Bella Vista, CA
  10. 1.5 6km NNE of Millville, CA
  11. 1.9 9km ESE of Millville, CA
  12. 1.7 24km N of Shasta Lake, CA
  13. 1.8 11km ESE of Millville, CA
  14. 1.6 7km WSW of Shingletown, CA
  15. 2.3 9km WSW of Shingletown, 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.