QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

8km W of La Porte, CA

· 14 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 40 kmButte County 45 kmSierra County 49 kmNevada County 50 kmYuba County 51 kmPlacer County 75 kmSutter County 90 kmEl Dorado County 110 kmTehama County 110 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 2.1 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Plumas County, 40 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2391 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 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 39.6833, -121.0752. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 40 km (25 mi) SSW of here earthquakes near Plumas County
Butte County, CA 45 km (28 mi) E of here earthquakes near Butte County
Sierra County, CA 49 km (30 mi) WNW of here earthquakes near Sierra County
Nevada County, CA 50 km (31 mi) NNW of here earthquakes near Nevada County
Yuba County, CA 51 km (32 mi) NNE of here earthquakes near Yuba County
Placer County, CA 75 km (47 mi) NNW of here earthquakes near Placer 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. 1.8 10km N of Oroville, CA
  2. 1.5 1 km ESE of C-Road, California
  3. 2.0 10km N of Oroville, CA
  4. 1.5 3 km SSE of Greenhorn, California
  5. 2.2 3km WSW of Cromberg, CA
  6. 2.7 5km ENE of East Quincy, CA
  7. 2.1 6km SW of Cromberg, CA
  8. 2.1 4km SE of Taylorsville, CA
  9. 2.0 9km N of Oroville, CA
  10. 1.9 5km N of Lake Wildwood, CA
  11. 1.9 9km W of Caribou, CA
  12. 2.1 7km N of Greenhorn, CA
  13. 1.5 6 km SSE of Quincy, California
  14. 2.2 6km SSE of Quincy, CA
  15. 1.6 7 km ENE of Cromberg, California

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.