QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6km SW of Cromberg, CA

· 2.2 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 19 kmSierra County 35 kmNevada County 59 kmButte County 74 kmYuba County 80 kmPlacer County 85 kmLassen County 99 kmStorey County 115 kmCarson City 115 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
2.2 km below the surface
Felt
no reports yet
Nearest
Plumas County, 19 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1786 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 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 39.8283, -120.7630. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 19 km (12 mi) SSE of here earthquakes near Plumas County
Sierra County, CA 35 km (22 mi) NW of here earthquakes near Sierra County
Nevada County, CA 59 km (37 mi) N of here earthquakes near Nevada County
Butte County, CA 74 km (46 mi) ENE of here earthquakes near Butte County
Yuba County, CA 80 km (49 mi) NE of here earthquakes near Yuba County
Placer County, CA 85 km (53 mi) N of here earthquakes near Placer 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. 1.6 5 km NNW of Plumas Eureka (historical), California
  2. 2.2 5km NNW of Indian Falls, CA
  3. 2.7 5km SW of Greenville, CA
  4. 2.2 6km SW of Greenville, CA
  5. 1.5 1 km SW of Spring Garden, California
  6. 2.2 4km NE of Lake Davis, CA
  7. 2.3 4km S of Meadow Valley, CA
  8. 1.5 4 km N of Greenhorn, California
  9. 2.8 15km WSW of Loyalton, CA
  10. 1.7 4 km WNW of Sierra City, California
  11. 1.5 3 km WNW of Sierra City, California
  12. 2.2 16km WSW of Loyalton, CA
  13. 2.1 17km SSW of Loyalton, CA
  14. 1.5 5 km SSE of Sierraville, California
  15. 1.6 4km N 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.