QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

2km ESE of Johnsville, CA

· -1.6 km deep · released about 88 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 25 kmPlumas County 28 kmNevada County 53 kmPlacer County 79 kmYuba County 80 kmButte County 81 kmCarson City 105 kmStorey County 105 kmLassen County 105 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 2.3 (md)
Depth
-1.6 km below the surface
Felt
no reports yet
Nearest
Sierra County, 25 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2629 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 88 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 88 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 39.7680, -120.6693. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 25 km (15 mi) NNW of here earthquakes near Sierra County
Plumas County, CA 28 km (18 mi) SSE of here earthquakes near Plumas County
Nevada County, CA 53 km (33 mi) N of here earthquakes near Nevada County
Placer County, CA 79 km (49 mi) N of here earthquakes near Placer County
Yuba County, CA 80 km (50 mi) NE of here earthquakes near Yuba County
Butte County, CA 81 km (50 mi) E of here earthquakes near Butte County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.2 14km SW of Whitehawk, CA
  2. 2.6 15km NW of Truckee, CA
  3. 2.1 16km NW of Truckee, CA
  4. 2.0 3km NNE of Spring Garden, CA
  5. 2.0 8km SSW of Chilcoot-Vinton, CA
  6. 1.8 15km NW of Truckee, CA
  7. 2.8 15km NW of Truckee, CA
  8. 1.6 9 km NNW of Greenhorn, California
  9. 2.2 15km NW of Truckee, CA
  10. 3.1 5km NE of East Quincy, CA
  11. 1.9 10km N of Spring Garden, CA
  12. 2.3 5km NNE of Little Grass Valley, CA
  13. 2.1 6km S of Bucks Lake, CA
  14. 2.8 17km NNW of Truckee, CA
  15. 2.4 18km NNW of Truckee, 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.