QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

9km WSW of Susanville, CA

· -2.0 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 38 kmPlumas County 44 kmSierra County 91 kmWashoe County 99 kmButte County 108 kmShasta County 118 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 1.9 (md)
Depth
-2.0 km below the surface
Felt
no reports yet
Nearest
Lassen County, 38 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2711 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 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 480,000× the energy of this one
  3. Around the size people start to feel M 3.0 43× the energy of this one
  4. This earthquake M 1.9 about 22 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 40.3813, -120.7390. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lassen County, CA 38 km (24 mi) SSW of here earthquakes near Lassen County
Plumas County, CA 44 km (27 mi) N of here earthquakes near Plumas County
Sierra County, CA 91 km (57 mi) NNW of here earthquakes near Sierra County
Washoe County, NV 99 km (61 mi) WSW of here earthquakes near Washoe County
Butte County, CA 108 km (67 mi) NE of here earthquakes near Butte County
Shasta County, CA 118 km (73 mi) ESE of here earthquakes near Shasta 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 7km NNW of Greenville, CA
  2. 1.7 9km NNW of Susanville, CA
  3. 1.5 8km NE of East Shore, CA
  4. 1.5 8km ENE of Hamilton Branch, CA
  5. 1.5 2km W of Almanor, CA
  6. 1.5 6 km ENE of East Quincy, California
  7. 1.6 3km NE of Canyondam, CA
  8. 2.1 6km NNW of Greenville, CA
  9. 3.1 2km NE of Prattville, CA
  10. 1.6 9 km NNW of Greenhorn, California
  11. 1.8 7km SW of Susanville, CA
  12. 1.6 30km NNE of Hamilton Branch, CA
  13. 1.5 15km ENE of East Shore, CA
  14. 1.7 5km NE of Canyondam, CA
  15. 3.1 5km NE of East Quincy, 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.