QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

16km W of Almanor, CA

· 6.5 km deep · released about 64 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 51 kmButte County 62 kmTehama County 74 kmShasta County 85 kmLassen County 85 kmSierra County 99 kmYuba County 103 kmGlenn County 111 kmNevada County 112 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 2.2 (md)
Depth
6.5 km below the surface
Felt
no reports yet
Nearest
Plumas County, 51 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3043 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 64 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 230,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 170,000× the energy of this one
  3. Around the size people start to feel M 3.0 15× the energy of this one
  4. This earthquake M 2.2 about 64 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 40.1958, -121.3625. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 51 km (32 mi) WNW of here earthquakes near Plumas County
Butte County, CA 62 km (39 mi) NNE of here earthquakes near Butte County
Tehama County, CA 74 km (46 mi) E of here earthquakes near Tehama County
Shasta County, CA 85 km (53 mi) SE of here earthquakes near Shasta County
Lassen County, CA 85 km (53 mi) SW of here earthquakes near Lassen County
Sierra County, CA 99 km (62 mi) NW of here earthquakes near Sierra County

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

Aftershocks so far

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

  1. 2.8 3km SE of Belden, CA
  2. 1.6 14km NNE of Mineral, CA
  3. 1.7 7km WSW of Greenville, CA
  4. 2.6 5km N of Almanor, CA
  5. 1.6 5km SSE of Chester, CA
  6. 2.5 5km SE of Chester, CA
  7. 3.4 5km WNW of Hamilton Branch, CA
  8. 2.1 5km SE of Chester, CA
  9. 1.7 11km N of Mineral, CA
  10. 1.5 3 km SE of Canyondam, California
  11. 1.6 18km NNW of Belden, CA
  12. 1.6 4 km SSE of Taylorsville, California
  13. 1.6 5km NNE of Caribou, CA
  14. 1.6 4km NNE of Caribou, CA
  15. 2.1 0km ENE of Canyondam, 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.