QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

29 km NW of Rancho Tehama Reserve, CA

· 11 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 38 kmTrinity County 66 kmGlenn County 66 kmShasta County 86 kmMendocino County 103 kmButte County 107 kmColusa County 115 kmLake County 117 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
11 km below the surface
Felt
no reports yet
Nearest
Tehama County, 38 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 821 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 40.1565, -122.6823. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 38 km (24 mi) W of here earthquakes near Tehama County
Trinity County, CA 66 km (41 mi) SE of here earthquakes near Trinity County
Glenn County, CA 66 km (41 mi) NNW of here earthquakes near Glenn County
Shasta County, CA 86 km (54 mi) SW of here earthquakes near Shasta County
Mendocino County, CA 103 km (64 mi) NE of here earthquakes near Mendocino County
Butte County, CA 107 km (67 mi) WNW of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 2.4 43 km NE of Covelo, CA
  2. 2.0 31 km N of Alder Springs, CA
  3. 1.8 21 km NW of Alder Springs, CA
  4. 1.9 16 km SSE of Anderson, CA
  5. 2.2 20 km NW of Alder Springs, CA
  6. 2.4 44 km S of Hayfork, CA
  7. 2.0 21 km NW of Alder Springs, CA
  8. 1.9 25 km NNW of Alder Springs, CA
  9. 1.9 21 km NW of Alder Springs, CA
  10. 1.7 21 km NW of Alder Springs, CA
  11. 2.4 20 km NW of Alder Springs, CA
  12. 2.4 7 km ESE of Red Bluff, CA
  13. 2.6 6 km ESE of Red Bluff, CA
  14. 1.7 20 km NW of Alder Springs, CA
  15. 1.8 20 km NW of Alder Springs, 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.