QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

14km WSW of Almanor, CA

· 11 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 46 kmButte County 60 kmTehama County 77 kmLassen County 86 kmShasta County 91 kmSierra County 94 kmYuba County 99 kmNevada County 107 kmGlenn County 111 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 1.5 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Plumas County, 46 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1926 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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, -121.3258. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 46 km (29 mi) WNW of here earthquakes near Plumas County
Butte County, CA 60 km (37 mi) NNE of here earthquakes near Butte County
Tehama County, CA 77 km (48 mi) E of here earthquakes near Tehama County
Lassen County, CA 86 km (54 mi) SW of here earthquakes near Lassen County
Shasta County, CA 91 km (56 mi) SE of here earthquakes near Shasta County
Sierra County, CA 94 km (58 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

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

  1. 1.7 4km ESE of Chester, CA
  2. 2.3 24km NNE of Forest Ranch, CA
  3. 2.2 8km W of Chester, CA
  4. 2.9 12km SE of Mineral, CA
  5. 2.5 3km E of Prattville, CA
  6. 2.3 3km ENE of Prattville, CA
  7. 2.4 21km SSE of Mineral, CA
  8. 1.6 2km E of Prattville, CA
  9. 2.8 2km ENE of Prattville, CA
  10. 2.5 2km ENE of Prattville, CA
  11. 2.4 16km SSE of Mineral, CA
  12. 1.7 12km WSW of Chester, CA
  13. 1.5 8km SSE of Mineral, CA
  14. 1.6 12km W of Chester, CA
  15. 1.7 7km SSE of Mineral, 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.