QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

5km NE of East Quincy, CA

· 12 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 4 kmSierra County 51 kmButte County 72 kmNevada County 74 kmLassen County 86 kmYuba County 88 kmPlacer County 101 kmTehama County 119 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 3.1 (ml)
Depth
12 km below the surface
Felt
38 reports · strongest reported intensity IV
Nearest
Plumas County, 4 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 428 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 38 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× more

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 39.9622, -120.8510. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 4 km (3 mi) SW of here earthquakes near Plumas County
Sierra County, CA 51 km (32 mi) NNW of here earthquakes near Sierra County
Butte County, CA 72 km (45 mi) ENE of here earthquakes near Butte County
Nevada County, CA 74 km (46 mi) N of here earthquakes near Nevada County
Lassen County, CA 86 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

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

  1. 2.2 3km ENE of Canyondam, CA
  2. 1.9 5km NNE of Almanor, CA
  3. 2.0 3km WSW of Whitehawk, CA
  4. 1.7 2 km ENE of East Quincy, California
  5. 2.6 4km NNE of Almanor, CA
  6. 1.5 6km NNE of Almanor, CA
  7. 1.6 3km S of Canyondam, CA
  8. 2.7 10km SSE of Beckwourth, CA
  9. 2.0 6km N of Greenhorn, CA
  10. 1.8 3km N of Spring Garden, CA
  11. 1.8 9km W of Susanville, CA
  12. 2.4 1km NE of Twain, CA
  13. 1.5 4km N of Twain, CA
  14. 1.6 3km NW of Greenville, CA
  15. 1.5 7km NW of Indian Falls, 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.