QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

9 km ENE of Rancho Tehama Reserve, CA

· 62 km deep · released about 780 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 10 kmGlenn County 51 kmButte County 74 kmShasta County 82 kmTrinity County 95 kmColusa County 98 kmLake County 112 kmMendocino County 119 kmYuba County 120 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 2.9 (md)
Depth
62 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Tehama County, 10 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 214 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 780 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 19,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.2× the energy of this one
  4. This earthquake M 2.9 about 780 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 40.0542, -122.3072. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 10 km (6 mi) SW of here earthquakes near Tehama County
Glenn County, CA 51 km (32 mi) N of here earthquakes near Glenn County
Butte County, CA 74 km (46 mi) NW of here earthquakes near Butte County
Shasta County, CA 82 km (51 mi) SSW of here earthquakes near Shasta County
Trinity County, CA 95 km (59 mi) SE of here earthquakes near Trinity County
Colusa County, CA 98 km (61 mi) N of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.7 22 km SSW of Manton, CA
  2. 2.7 5 km W of Hamilton City, CA
  3. 1.9 16 km NE of Red Bluff, CA
  4. 2.5 9 km E of Rancho Tehama Reserve, CA
  5. 1.6 41 km WNW of Rancho Tehama Reserve, CA
  6. 2.7 4 km SSE of Anderson, CA
  7. 2.2 4 km WSW of Hamilton City, CA
  8. 1.8 15 km NNE of Alder Springs, CA
  9. 1.8 13 km SW of Manton, CA
  10. 1.7 17 km NE of Red Bluff, CA
  11. 2.6 16 km NNE of Red Bluff, CA
  12. 3.9 15 km NNE of Alder Springs, CA
  13. 2.0 13 km SW of Manton, CA
  14. 1.8 11 km SW of Manton, CA
  15. 1.8 12 km SW of Manton, 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.