QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

13 km ESE of Westwood, California

· 4.8 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 32 kmLassen County 52 kmSierra County 83 kmButte County 94 kmNevada County 110 kmWashoe County 112 kmShasta County 114 kmTehama County 119 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 1.7 (md)
Depth
4.8 km below the surface
Felt
no reports yet
Nearest
Plumas County, 32 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3009 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 40.2810, -120.8480. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 32 km (20 mi) N of here earthquakes near Plumas County
Lassen County, CA 52 km (32 mi) SSW of here earthquakes near Lassen County
Sierra County, CA 83 km (52 mi) NNW of here earthquakes near Sierra County
Butte County, CA 94 km (58 mi) NE of here earthquakes near Butte County
Nevada County, CA 110 km (68 mi) N of here earthquakes near Nevada County
Washoe County, NV 112 km (70 mi) WSW of here earthquakes near Washoe County

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

Aftershocks so far

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

  1. 1.6 2km SW of Cromberg, CA
  2. 1.6 9km N of Spring Garden, CA
  3. 2.0 2km NE of Canyondam, CA
  4. 1.7 2km NNE of Prattville, CA
  5. 1.8 16km WSW of Almanor, CA
  6. 2.3 3km ENE of Greenhorn, CA
  7. 1.8 4km NNW of Almanor, CA
  8. 1.7 5km NW of Almanor, CA
  9. 1.9 2km ESE of Twain, CA
  10. 1.8 10km NNE of Greenhorn, CA
  11. 1.6 1km SSW of Almanor, CA
  12. 1.6 3km NNE of Belden, CA
  13. 1.6 3km W of Canyondam, CA
  14. 2.1 5km E of Indian Falls, CA
  15. 2.1 2km NE 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.