QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

27 km NE of Viola, CA

· -1.8 km deep · released about 800 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 52 kmLassen County 69 kmTehama County 91 kmPlumas County 92 kmButte County 114 kmModoc 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 3.0 (md)
Depth
-1.8 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Shasta County, 52 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 43 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 800 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 420,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 19,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 13,000× the energy of this one
  4. This earthquake M 3.0 about 800 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 40.6808, -121.4360. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 52 km (32 mi) E of here earthquakes near Shasta County
Lassen County, CA 69 km (43 mi) W of here earthquakes near Lassen County
Tehama County, CA 91 km (57 mi) NE of here earthquakes near Tehama County
Plumas County, CA 92 km (57 mi) NW of here earthquakes near Plumas County
Butte County, CA 114 km (71 mi) N of here earthquakes near Butte County
Modoc County, CA 118 km (73 mi) SSW of here earthquakes near Modoc County

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

Aftershocks so far

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

  1. 2.4 12 km WSW of Chester, CA
  2. 1.5 12 km WSW of Chester, CA
  3. 1.6 9 km ENE of Mineral, CA
  4. 1.7 9 km ENE of Shingletown, CA
  5. 1.6 7 km NNE of Burney, CA
  6. 1.8 17 km ENE of Mineral, CA
  7. 1.6 18 km ENE of Mineral, CA
  8. 1.7 17 km ENE of Mineral, CA
  9. 2.6 11 km ESE of Burney, CA
  10. 1.9 12 km NNE of Chester, CA
  11. 1.6 4 km SSE of Chester, CA
  12. 1.8 16 km NNE of Shingletown, CA
  13. 1.8 12 km NNE of Mineral, CA
  14. 1.8 12 km NNE of Mineral, CA
  15. 2.0 4 km S of Burney, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2023-09-08 — it released about 1,100 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.