QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

4 km WSW of Red Bluff, CA

· 41 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 5 kmGlenn County 63 kmShasta County 70 kmButte County 79 kmTrinity County 90 kmColusa County 109 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 2.7 (md)
Depth
41 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Tehama County, 5 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 47 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 40.1595, -122.2733. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 5 km (3 mi) NW of here earthquakes near Tehama County
Glenn County, CA 63 km (39 mi) N of here earthquakes near Glenn County
Shasta County, CA 70 km (43 mi) SSW of here earthquakes near Shasta County
Butte County, CA 79 km (49 mi) NW of here earthquakes near Butte County
Trinity County, CA 90 km (56 mi) SE of here earthquakes near Trinity County
Colusa County, CA 109 km (68 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

19 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. 2.7 4 km SSE of Anderson, CA
  6. 1.8 13 km SW of Manton, CA
  7. 1.7 17 km NE of Red Bluff, CA
  8. 2.6 16 km NNE of Red Bluff, CA
  9. 2.0 13 km SW of Manton, CA
  10. 1.8 11 km SW of Manton, CA
  11. 1.8 12 km SW of Manton, CA
  12. 2.7 10 km SW of Manton, CA
  13. 1.6 12 km SW of Manton, CA
  14. 2.4 11 km NNE of Gerber, CA
  15. 2.2 21 km NE 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.