QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

16km W of Round Mountain, CA

· 4.3 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 9 kmTehama County 77 kmTrinity County 85 kmSiskiyou County 92 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
4.3 km below the surface
Felt
no reports yet
Nearest
Shasta County, 9 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1650 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 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× 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 40.8148, -122.1262. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 9 km (6 mi) NW of here earthquakes near Shasta County
Tehama County, CA 77 km (48 mi) N of here earthquakes near Tehama County
Trinity County, CA 85 km (53 mi) ENE of here earthquakes near Trinity County
Siskiyou County, CA 92 km (57 mi) SSE of here earthquakes near Siskiyou County
Plumas County, CA 143 km (89 mi) NW of here earthquakes near Plumas County
Modoc County, CA 146 km (91 mi) SW of here earthquakes near Modoc County

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

Aftershocks so far

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

  1. 1.6 7km WSW of Dunsmuir, CA
  2. 1.9 5km ENE of Shasta, CA
  3. 1.6 1km NNE of Bella Vista, CA
  4. 1.7 2km NW of Bella Vista, CA
  5. 1.7 11km NW of Shasta Lake, CA
  6. 1.6 2km N of Bella Vista, CA
  7. 1.6 18km NNE of Bella Vista, CA
  8. 2.2 18km NNE of Bella Vista, CA
  9. 1.8 5km NNE of Shasta, CA
  10. 1.7 4km N of Viola, CA
  11. 1.8 18km NW of Viola, CA
  12. 1.6 8km NNW of Bella Vista, CA
  13. 1.9 16km ESE of McCloud, CA
  14. 1.6 9km NE of Shasta Lake, CA
  15. 1.9 10km NW 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.

On USGS

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