QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

16 km SW of Rancho Tehama Reserve, CA

· 17 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 33 kmTehama County 35 kmButte County 81 kmColusa County 83 kmLake County 90 kmMendocino County 96 kmTrinity County 99 kmShasta County 104 kmSutter 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
17 km below the surface
Felt
no reports yet
Nearest
Glenn County, 33 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 438 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 40 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 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 39.8918, -122.4995. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 33 km (21 mi) NNW of here earthquakes near Glenn County
Tehama County, CA 35 km (21 mi) SW of here earthquakes near Tehama County
Butte County, CA 81 km (50 mi) WNW of here earthquakes near Butte County
Colusa County, CA 83 km (51 mi) NNW of here earthquakes near Colusa County
Lake County, CA 90 km (56 mi) NNE of here earthquakes near Lake County
Mendocino County, CA 96 km (59 mi) ENE of here earthquakes near Mendocino County

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

Aftershocks so far

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

  1. 1.9 22 km NW of Alder Springs, CA
  2. 2.7 4 km WSW of Red Bluff, CA
  3. 1.9 28 km WNW of Rancho Tehama Reserve, CA
  4. 2.2 28 km WNW of Rancho Tehama Reserve, CA
  5. 2.3 28 km WNW of Rancho Tehama Reserve, CA
  6. 2.4 29 km WNW of Rancho Tehama Reserve, CA
  7. 1.8 12 km WNW of Alder Springs, CA
  8. 1.9 12 km WNW of Alder Springs, CA
  9. 1.8 21 km NW of Alder Springs, CA
  10. 1.6 33 km NNW of Alder Springs, CA
  11. 2.4 9 km S of Hamilton City, CA
  12. 2.0 5 km S of Alder Springs, CA
  13. 2.0 13 km W of Alder Springs, CA
  14. 1.8 28 km ENE of Covelo, CA
  15. 2.0 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.