QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

9km W of Susanville, CA

· 10 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 36 kmPlumas County 46 kmSierra County 94 kmWashoe County 99 kmButte County 109 kmShasta County 116 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 1.8 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Lassen County, 36 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2054 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 40.4040, -120.7537. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lassen County, CA 36 km (23 mi) SSW of here earthquakes near Lassen County
Plumas County, CA 46 km (29 mi) N of here earthquakes near Plumas County
Sierra County, CA 94 km (58 mi) NNW of here earthquakes near Sierra County
Washoe County, NV 99 km (62 mi) WSW of here earthquakes near Washoe County
Butte County, CA 109 km (68 mi) NE of here earthquakes near Butte County
Shasta County, CA 116 km (72 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. 1.7 5km WNW of Hamilton Branch, CA
  2. 1.5 5km N of Almanor, CA
  3. 2.1 3km N of Canyondam, CA
  4. 1.5 5km E of Caribou, CA
  5. 2.0 2km E of Prattville, CA
  6. 1.8 4km NE of Prattville, CA
  7. 2.5 2km N of Prattville, CA
  8. 2.4 2km ENE of Prattville, CA
  9. 2.2 2km NW of Canyondam, CA
  10. 1.7 2 km SSW of Crescent Mills, California
  11. 2.0 3km SSW of East Shore, CA
  12. 2.0 5km NE of Hamilton Branch, CA
  13. 2.1 3km SW of East Shore, CA
  14. 1.6 9km WSW of Almanor, CA
  15. 1.5 4km NNE of Prattville, 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.