QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

13km NE of Montgomery Creek, CA

· 12 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 26 kmTehama County 95 kmSiskiyou County 95 kmLassen County 103 kmTrinity County 114 kmModoc County 118 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
12 km below the surface
Felt
no reports yet
Nearest
Shasta County, 26 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1798 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 40.9212, -121.8142. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 26 km (16 mi) NE of here earthquakes near Shasta County
Tehama County, CA 95 km (59 mi) NNE of here earthquakes near Tehama County
Siskiyou County, CA 95 km (59 mi) SE of here earthquakes near Siskiyou County
Lassen County, CA 103 km (64 mi) WNW of here earthquakes near Lassen County
Trinity County, CA 114 km (71 mi) ENE of here earthquakes near Trinity County
Modoc County, CA 118 km (73 mi) SW of here earthquakes near Modoc County

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

Aftershocks so far

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

  1. 1.6 8km NE of Shasta Lake, CA
  2. 1.6 22km SE of Burney, CA
  3. 1.6 18km SE of Burney, CA
  4. 1.6 9km NE of Shasta Lake, CA
  5. 1.7 27km N of Shasta Lake, CA
  6. 1.7 13km NNE of Shingletown, CA
  7. 1.6 8km NE of Shasta Lake, CA
  8. 1.8 4km NNE of Viola, CA
  9. 1.6 9km NE of Shasta Lake, CA
  10. 1.6 4km S of Bella Vista, CA
  11. 2.8 11km N of McArthur, CA
  12. 2.4 14km NNE of Shingletown, CA
  13. 1.6 8km NNW of Bella Vista, CA
  14. 1.6 9km NE of Shingletown, CA
  15. 1.9 8km N of Viola, 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.