QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

10km WSW of Chester, CA

· 5.4 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 55 kmButte County 72 kmTehama County 77 kmLassen County 78 kmShasta County 80 kmSierra County 105 kmYuba County 112 kmGlenn County 117 kmNevada County 120 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
5.4 km below the surface
Felt
no reports yet
Nearest
Plumas County, 55 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2560 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 10 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 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 40.2797, -121.3453. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 55 km (34 mi) NW of here earthquakes near Plumas County
Butte County, CA 72 km (45 mi) NNE of here earthquakes near Butte County
Tehama County, CA 77 km (48 mi) ENE of here earthquakes near Tehama County
Lassen County, CA 78 km (49 mi) SW of here earthquakes near Lassen County
Shasta County, CA 80 km (49 mi) SE of here earthquakes near Shasta County
Sierra County, CA 105 km (65 mi) NW of here earthquakes near Sierra County

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

Aftershocks so far

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

  1. 1.6 7km S of Mineral, CA
  2. 2.2 5km N of Almanor, CA
  3. 2.3 10km NNW of Viola, CA
  4. 1.6 7km NNW of Greenville, CA
  5. 1.5 8km NE of East Shore, CA
  6. 1.5 8km ENE of Hamilton Branch, CA
  7. 1.5 2km W of Almanor, CA
  8. 1.6 3km NE of Canyondam, CA
  9. 2.1 6km NNW of Greenville, CA
  10. 3.1 2km NE of Prattville, CA
  11. 1.6 12km ESE of Viola, CA
  12. 2.2 12km ESE of Viola, CA
  13. 1.6 22km NE of Viola, CA
  14. 2.0 14km NNE of Mineral, CA
  15. 1.8 11km NW of Viola, 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.