QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

3km N of Spring Garden, CA

· 8.6 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 7 kmSierra County 46 kmNevada County 70 kmButte County 74 kmYuba County 87 kmLassen County 89 kmPlacer County 97 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
8.6 km below the surface
Felt
no reports yet
Nearest
Plumas County, 7 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2053 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 39.9300, -120.8025. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 7 km (4 mi) SSE of here earthquakes near Plumas County
Sierra County, CA 46 km (29 mi) NNW of here earthquakes near Sierra County
Nevada County, CA 70 km (44 mi) N of here earthquakes near Nevada County
Butte County, CA 74 km (46 mi) ENE of here earthquakes near Butte County
Yuba County, CA 87 km (54 mi) NNE of here earthquakes near Yuba County
Lassen County, CA 89 km (55 mi) S of here earthquakes near Lassen County

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

Aftershocks so far

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

  1. 2.2 4km ENE of Prattville, CA
  2. 2.1 4km SE of Taylorsville, CA
  3. 2.8 11km NNE of Lake Davis, CA
  4. 1.6 3km S of East Shore, CA
  5. 1.9 9km W of Caribou, CA
  6. 2.1 7km N of Greenhorn, CA
  7. 1.9 4km NNE of Prattville, CA
  8. 2.1 1km WNW of Lake Davis, CA
  9. 1.5 6 km SSE of Quincy, California
  10. 2.2 6km SSE of Quincy, CA
  11. 1.5 4km S of Canyondam, CA
  12. 1.6 13km SW of Almanor, CA
  13. 1.5 1km WSW of Canyondam, CA
  14. 2.1 4km SSW of East Shore, CA
  15. 2.3 2km N 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.