QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

19 km SW of Shasta, CA

· 18 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 46 kmTehama County 50 kmShasta County 59 kmGlenn County 98 kmHumboldt County 113 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
18 km below the surface
Felt
no reports yet
Nearest
Trinity County, 46 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1126 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 40.4650, -122.6267. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 46 km (29 mi) ESE of here earthquakes near Trinity County
Tehama County, CA 50 km (31 mi) NW of here earthquakes near Tehama County
Shasta County, CA 59 km (37 mi) WSW of here earthquakes near Shasta County
Glenn County, CA 98 km (61 mi) N of here earthquakes near Glenn County
Humboldt County, CA 113 km (70 mi) ESE of here earthquakes near Humboldt County
Butte County, CA 124 km (77 mi) NW of here earthquakes near Butte 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. 2.2 16 km NE of Red Bluff, CA
  2. 1.9 9 km NE of Shasta Lake, CA
  3. 2.0 39 km NW of Rancho Tehama Reserve, CA
  4. 1.8 9 km NW of Shasta Lake, CA
  5. 1.9 10 km WNW of Shasta Lake, CA
  6. 2.2 43 km NW of Rancho Tehama Reserve, CA
  7. 2.0 14 km SSE of Hayfork, CA
  8. 1.6 8 km NNW of Bella Vista, CA
  9. 2.0 18 km NE of Red Bluff, CA
  10. 1.9 1 km ENE of Palo Cedro, CA
  11. 1.8 1 km E of Palo Cedro, CA
  12. 1.8 9 km NE of Shasta Lake, CA
  13. 2.4 4 km WNW of Shasta Lake, CA
  14. 2.0 1 km NE of Bella Vista, CA
  15. 1.6 6 km SE of Bella Vista, 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.