QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

12km NW of Viola, CA

· 18 km deep · released about 390 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 29 kmTehama County 64 kmLassen County 100 kmButte County 104 kmPlumas County 106 kmTrinity County 112 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 2.7 (md)
Depth
18 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Shasta County, 29 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3209 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 390 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 39,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 28,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 390 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 40.5888, -121.7918. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 29 km (18 mi) SE of here earthquakes near Shasta County
Tehama County, CA 64 km (39 mi) NE of here earthquakes near Tehama County
Lassen County, CA 100 km (62 mi) W of here earthquakes near Lassen County
Butte County, CA 104 km (65 mi) N of here earthquakes near Butte County
Plumas County, CA 106 km (66 mi) NW of here earthquakes near Plumas County
Trinity County, CA 112 km (69 mi) E of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 1.7 7km NW of Montgomery Creek, CA
  2. 3.0 15km NNE of Shingletown, CA
  3. 2.0 6km W of Round Mountain, CA
  4. 2.2 10km WNW of Mineral, CA
  5. 1.7 10km WNW of Mineral, CA
  6. 1.6 1km SSW of Palo Cedro, CA
  7. 1.7 14km NNW of Viola, CA
  8. 1.5 9km W of Mineral, CA
  9. 1.6 9km NE of Shasta Lake, CA
  10. 1.6 4km N of Millville, CA
  11. 1.6 12km WSW of Shingletown, CA
  12. 1.6 9km SW of Shingletown, CA
  13. 1.8 1km WSW of Palo Cedro, CA
  14. 1.8 1km SW of Palo Cedro, CA
  15. 1.5 3km NW of Palo Cedro, 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.