QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3mw

24km WNW of Truckee, CA

· 10 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 23 kmNevada County 28 kmPlacer County 41 kmEl Dorado County 66 kmCarson City 66 kmPlumas County 76 kmYuba County 77 kmStorey County 81 kmDouglas County 90 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 3.3 (mw)
Depth
10 km below the surface
Felt
182 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Sierra County, 23 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1857 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 182 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× more

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 39.3727, -120.4627. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 23 km (14 mi) SSE of here earthquakes near Sierra County
Nevada County, CA 28 km (17 mi) ENE of here earthquakes near Nevada County
Placer County, CA 41 km (26 mi) NNE of here earthquakes near Placer County
El Dorado County, CA 66 km (41 mi) N of here earthquakes near El Dorado County
Carson City, NV 66 km (41 mi) WNW of here earthquakes near Carson City
Plumas County, CA 76 km (47 mi) SSE of here earthquakes near Plumas 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. 1.5 2 km ESE of Truckee, California
  2. 1.8 3km ENE of Dollar Point, CA
  3. 2.3 3km ENE of Dollar Point, CA
  4. 2.0 12km NW of Truckee, CA
  5. 1.6 3km ENE of Dollar Point, CA
  6. 1.6 3km ENE of Dollar Point, CA
  7. 3.1 10km ESE of Loyalton, CA
  8. 2.8 15km WSW of Loyalton, CA
  9. 1.7 4 km WNW of Sierra City, California
  10. 1.5 3 km WNW of Sierra City, California
  11. 2.2 16km WSW of Loyalton, CA
  12. 2.1 17km SSW of Loyalton, CA
  13. 1.5 5 km SSE of Sierraville, California
  14. 2.1 6 km SE of Floriston, California
  15. 2.8 6 km SE of Floriston, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.7 on 2021-05-07 — it released about 110 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.