QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

12km WSW of La Porte, CA

· 7.2 km deep · released about 37 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Butte County 42 kmPlumas County 45 kmYuba County 47 kmNevada County 50 kmSierra County 52 kmPlacer County 75 kmSutter County 86 kmTehama County 108 kmEl Dorado County 109 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
7.2 km below the surface
Felt
no reports yet
Nearest
Butte County, 42 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2572 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 37 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 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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 39.6587, -121.1173. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Butte County, CA 42 km (26 mi) E of here earthquakes near Butte County
Plumas County, CA 45 km (28 mi) SW of here earthquakes near Plumas County
Yuba County, CA 47 km (29 mi) NNE of here earthquakes near Yuba County
Nevada County, CA 50 km (31 mi) NW of here earthquakes near Nevada County
Sierra County, CA 52 km (32 mi) W of here earthquakes near Sierra County
Placer County, CA 75 km (46 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

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

  1. 1.9 22km SSW of Whitehawk, CA
  2. 2.0 3km WSW of Whitehawk, CA
  3. 1.7 2 km ENE of East Quincy, California
  4. 2.3 9km N of Loma Rica, CA
  5. 2.0 6km N of Greenhorn, CA
  6. 1.8 3km N of Spring Garden, CA
  7. 1.8 10km N of Oroville, CA
  8. 2.4 1km NE of Twain, CA
  9. 1.5 4km N of Twain, CA
  10. 1.5 7km NW of Indian Falls, CA
  11. 2.5 5km NNE of East Quincy, CA
  12. 1.9 5km NE of Greenhorn, CA
  13. 2.5 4km NE of Greenhorn, CA
  14. 1.9 20km SW of Whitehawk, CA
  15. 1.7 7km NNW of Belden, 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.