QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

9km E of Little Grass Valley, CA

· -1.6 km deep · released about 58 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 29 kmSierra County 34 kmNevada County 49 kmButte County 63 kmYuba County 65 kmPlacer County 75 kmSutter County 105 kmEl Dorado County 109 kmLassen County 112 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 2.2 (md)
Depth
-1.6 km below the surface
Felt
no reports yet
Nearest
Plumas County, 29 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1607 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 58 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 260,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 58 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 39.7302, -120.8697. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 29 km (18 mi) S of here earthquakes near Plumas County
Sierra County, CA 34 km (21 mi) WNW of here earthquakes near Sierra County
Nevada County, CA 49 km (30 mi) N of here earthquakes near Nevada County
Butte County, CA 63 km (39 mi) E of here earthquakes near Butte County
Yuba County, CA 65 km (41 mi) NE of here earthquakes near Yuba County
Placer County, CA 75 km (47 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

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

  1. 1.6 Northern California
  2. 1.5 5 km SSW of Cromberg, California
  3. 2.2 17km WSW of Loyalton, CA
  4. 1.5 4 km SSW of Greenville, California
  5. 2.4 6km NW of Johnsville, CA
  6. 1.6 5 km WNW of Plumas Eureka, California
  7. 2.0 5 km NNW of Plumas Eureka (historical), California
  8. 1.5 4 km W of Greenville, California
  9. 1.7 7 km S of Canyondam, California
  10. 1.6 6 km NNW of Beckwourth, California
  11. 1.6 Northern California
  12. 1.6 8 km SSE of Johnsville, California
  13. 1.6 7 km S of Plumas Eureka (historical), California
  14. 1.5 9 km SSE of Beckwourth, California
  15. 1.6 1 km NNE of Paxton, 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

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