QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

3km N of Greenhorn, CA

· 2.3 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 10 kmSierra County 44 kmNevada County 70 kmButte County 79 kmLassen County 88 kmYuba County 89 kmPlacer County 96 kmStorey 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 2.8 (md)
Depth
2.3 km below the surface
Felt
5 reports · strongest reported intensity III
Nearest
Plumas County, 10 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1287 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 39.9292, -120.7470. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 10 km (6 mi) SE of here earthquakes near Plumas County
Sierra County, CA 44 km (27 mi) NNW of here earthquakes near Sierra County
Nevada County, CA 70 km (44 mi) N of here earthquakes near Nevada County
Butte County, CA 79 km (49 mi) ENE of here earthquakes near Butte County
Lassen County, CA 88 km (55 mi) S of here earthquakes near Lassen County
Yuba County, CA 89 km (56 mi) NE of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 2.4 4km S of East Shore, CA
  2. 2.2 3km NE of Prattville, CA
  3. 2.2 4km ENE of Prattville, CA
  4. 2.2 4km N of Canyondam, CA
  5. 2.4 3km NNW of Canyondam, CA
  6. 2.0 3km ESE of Prattville, CA
  7. 2.5 4km NW of Canyondam, CA
  8. 5.2 4km NW of Canyondam, CA
  9. 2.4 2km NNE of Almanor, CA
  10. 2.5 2km NNE of Almanor, CA
  11. 3.0 4km NW of Canyondam, CA
  12. 2.4 4km ESE of Prattville, CA
  13. 2.3 4km NNW of Canyondam, CA
  14. 2.2 4km NNW of Canyondam, CA
  15. 2.8 4km NNW 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.