QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

22km SSE of Dunsmuir, CA

· 8.2 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 31 kmSiskiyou County 70 kmTrinity County 88 kmTehama County 99 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
8.2 km below the surface
Felt
no reports yet
Nearest
Shasta County, 31 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2875 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 41.0162, -122.1887. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 31 km (19 mi) NNW of here earthquakes near Shasta County
Siskiyou County, CA 70 km (43 mi) SSE of here earthquakes near Siskiyou County
Trinity County, CA 88 km (55 mi) ENE of here earthquakes near Trinity County
Tehama County, CA 99 km (62 mi) N of here earthquakes near Tehama County
Plumas County, CA 162 km (101 mi) NW of here earthquakes near Plumas County

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

Aftershocks so far

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

  1. 1.6 14km N of McCloud, CA
  2. 1.9 14km N of McCloud, CA
  3. 1.5 9km SE of Dunsmuir, CA
  4. 1.8 5km N of McCloud, CA
  5. 2.0 8km WSW of Dunsmuir, CA
  6. 1.6 14km NNE of French Gulch, CA
  7. 1.7 13km NNE of French Gulch, CA
  8. 1.8 9km NNE of Shasta Lake, CA
  9. 1.8 17km NNE of Bella Vista, CA
  10. 1.6 16km N of McCloud, CA
  11. 1.6 26km NNE of Shasta Lake, CA
  12. 1.7 3km NNW of Millville, CA
  13. 1.5 9km NE of Shasta Lake, CA
  14. 1.6 4km NNE of Millville, CA
  15. 1.8 6km NNE of Millville, 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.