QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

2km SE of Twain, CA

· 8.6 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 18 kmButte County 62 kmSierra County 65 kmNevada County 82 kmLassen County 86 kmYuba County 86 kmTehama County 103 kmPlacer County 109 kmShasta 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 1.6 (md)
Depth
8.6 km below the surface
Felt
no reports yet
Nearest
Plumas County, 18 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2857 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 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 9 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 40.0090, -121.0352. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 18 km (11 mi) W of here earthquakes near Plumas County
Butte County, CA 62 km (38 mi) NE of here earthquakes near Butte County
Sierra County, CA 65 km (40 mi) NW of here earthquakes near Sierra County
Nevada County, CA 82 km (51 mi) NNW of here earthquakes near Nevada County
Lassen County, CA 86 km (53 mi) SSW of here earthquakes near Lassen County
Yuba County, CA 86 km (54 mi) NNE of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 1.8 2 km E of Cromberg, California
  2. 1.6 7 km NNE of Plumas Eureka, California
  3. 1.9 9km WSW of Susanville, CA
  4. 1.6 4 km SSW of Canyondam, California
  5. 2.0 6km SSW of Canyondam, CA
  6. 1.8 3km NE of Greenville, CA
  7. 1.7 6 km N of Greenhorn, California
  8. 1.6 4km W of Almanor, CA
  9. 2.1 13km WSW of Chester, CA
  10. 1.7 15km SSW of Susanville, CA
  11. 1.8 15km SSW of Susanville, CA
  12. 1.8 4km W of Taylorsville, CA
  13. 1.9 2km WNW of East Shore, CA
  14. 1.8 12km SW of Johnstonville, CA
  15. 1.9 4km SW of East Shore, 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.