QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

4km N of Twain, CA

· 3.1 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 20 kmButte County 65 kmSierra County 69 kmLassen County 82 kmNevada County 87 kmYuba County 91 kmTehama County 102 kmPlacer County 114 kmShasta County 116 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
3.1 km below the surface
Felt
no reports yet
Nearest
Plumas County, 20 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2082 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 40.0547, -121.0410. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 20 km (12 mi) WNW of here earthquakes near Plumas County
Butte County, CA 65 km (40 mi) NE of here earthquakes near Butte County
Sierra County, CA 69 km (43 mi) NW of here earthquakes near Sierra County
Lassen County, CA 82 km (51 mi) SSW of here earthquakes near Lassen County
Nevada County, CA 87 km (54 mi) NNW of here earthquakes near Nevada County
Yuba County, CA 91 km (57 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. 2.2 4km ENE of Prattville, CA
  2. 1.9 10km WSW of Chester, CA
  3. 2.1 4km SE of Taylorsville, CA
  4. 1.6 3km S of East Shore, CA
  5. 1.9 9km W of Caribou, CA
  6. 2.1 7km N of Greenhorn, CA
  7. 1.5 11km SW of Chester, CA
  8. 1.9 4km NNE of Prattville, CA
  9. 1.5 6 km SSE of Quincy, California
  10. 2.2 6km SSE of Quincy, CA
  11. 1.7 8km WNW of Chester, CA
  12. 1.5 15km ENE of Mineral, CA
  13. 1.5 4km S of Canyondam, CA
  14. 2.1 10km W of Almanor, CA
  15. 2.1 11km W of Almanor, 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.