QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

14km E of Big Bend, CA

· 2.7 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 39 kmSiskiyou County 90 kmLassen County 101 kmModoc County 106 kmTehama County 109 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
2.7 km below the surface
Felt
no reports yet
Nearest
Shasta County, 39 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1660 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× 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 43 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 41.0305, -121.7447. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 39 km (24 mi) NE of here earthquakes near Shasta County
Siskiyou County, CA 90 km (56 mi) SE of here earthquakes near Siskiyou County
Lassen County, CA 101 km (63 mi) WNW of here earthquakes near Lassen County
Modoc County, CA 106 km (66 mi) SW of here earthquakes near Modoc County
Tehama County, CA 109 km (68 mi) NNE of here earthquakes near Tehama County
Trinity County, CA 123 km (76 mi) ENE of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 1.8 5km NNE of Montgomery Creek, CA
  2. 1.6 14km N of McCloud, CA
  3. 1.8 18km SSE of Round Mountain, CA
  4. 2.1 13km S of Dunsmuir, CA
  5. 2.2 12km NNE of Bella Vista, CA
  6. 2.1 8km ENE of Montgomery Creek, CA
  7. 2.3 21km SSE of Burney, CA
  8. 1.8 13km NNE of Bella Vista, CA
  9. 2.1 12km NNE of Bella Vista, CA
  10. 1.8 18km NW of Viola, CA
  11. 1.6 12km WNW of Burney, CA
  12. 1.9 10km NW of Burney, CA
  13. 1.5 12km NW of Burney, CA
  14. 1.6 8km SW of Round Mountain, CA
  15. 2.2 5km ENE of McCloud, 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.