QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

20km WSW of Mount Shasta, CA

· 15 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Siskiyou County 35 kmShasta County 71 kmTrinity County 84 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
15 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Siskiyou County, 35 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2651 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 41.2712, -122.5448. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Siskiyou County, CA 35 km (22 mi) S of here earthquakes near Siskiyou County
Shasta County, CA 71 km (44 mi) NW of here earthquakes near Shasta County
Trinity County, CA 84 km (52 mi) NE of here earthquakes near Trinity County
Humboldt County, CA 132 km (82 mi) ENE of here earthquakes near Humboldt 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. 2.1 0km NE of Etna, CA
  2. 2.9 25km N of Shasta Lake, CA
  3. 1.7 29km N of Shasta Lake, CA
  4. 1.6 23km N of Shasta Lake, CA
  5. 1.9 28km N of Shasta Lake, CA
  6. 2.0 7km ESE of McCloud, CA
  7. 2.1 26km N of Shasta Lake, CA
  8. 1.9 25km N of Shasta Lake, CA
  9. 2.8 25km NNW of Shasta Lake, CA
  10. 1.6 4km W of Edgewood, CA
  11. 1.5 10km S of McCloud, CA
  12. 2.6 23km SW of Mount Hebron, CA
  13. 2.5 13km SE of Dunsmuir, CA
  14. 1.8 9km E of McCloud, CA
  15. 1.8 26km N of Shasta Lake, 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.