QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

1km NE of Twain, CA

· 6.5 km deep · released about 110 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 19 kmButte County 62 kmSierra County 67 kmNevada County 84 kmLassen County 85 kmYuba County 88 kmTehama County 102 kmPlacer County 110 kmShasta County 118 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 2.4 (md)
Depth
6.5 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Plumas County, 19 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2070 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 110 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 140,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 99,000× the energy of this one
  3. Around the size people start to feel M 3.0 8.8× the energy of this one
  4. This earthquake M 2.4 about 110 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 40.0240, -121.0420. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 19 km (12 mi) W of here earthquakes near Plumas County
Butte County, CA 62 km (39 mi) NE of here earthquakes near Butte County
Sierra County, CA 67 km (41 mi) NW of here earthquakes near Sierra County
Nevada County, CA 84 km (52 mi) NNW of here earthquakes near Nevada County
Lassen County, CA 85 km (53 mi) SSW of here earthquakes near Lassen County
Yuba County, CA 88 km (55 mi) NNE of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 1.9 13km WSW of Almanor, CA
  2. 1.9 9km WSW of Chester, CA
  3. 2.0 9km WSW of Chester, CA
  4. 2.2 4km ENE of Prattville, CA
  5. 1.9 10km WSW of Chester, CA
  6. 2.1 4km SE of Taylorsville, CA
  7. 1.6 3km S of East Shore, CA
  8. 1.9 9km W of Caribou, CA
  9. 2.1 7km N of Greenhorn, CA
  10. 1.5 11km SW of Chester, CA
  11. 1.9 4km NNE of Prattville, CA
  12. 1.5 6 km SSE of Quincy, California
  13. 2.2 6km SSE of Quincy, CA
  14. 1.7 8km WNW of Chester, CA
  15. 1.5 4km S 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.