QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

24km SW of Mount Hebron, CA

· 1.0 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Siskiyou County 26 kmJackson County 92 kmShasta County 100 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
1.0 km below the surface
Felt
no reports yet
Nearest
Siskiyou County, 26 km WSW
Nearest mapped fault
Cedar Mountain fault system, 13 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2637 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 41.6525, -122.2287. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Siskiyou County, CA 26 km (16 mi) ENE of here earthquakes near Siskiyou County
Jackson County, OR 92 km (57 mi) SSE of here earthquakes near Jackson County
Shasta County, CA 100 km (62 mi) N of here earthquakes near Shasta County
Klamath County, OR 124 km (77 mi) SSW of here earthquakes near Klamath County
Trinity County, CA 134 km (83 mi) NNE of here earthquakes near Trinity County
Josephine County, OR 138 km (86 mi) SE of here earthquakes near Josephine County

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

Aftershocks so far

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

  1. 1.7 6km NE of Dunsmuir, CA
  2. 1.6 6km NE of Dunsmuir, CA
  3. 1.8 15km NE of McCloud, CA
  4. 1.7 9km E of Carrick, CA
  5. 1.9 8km NNE of McCloud, CA
  6. 2.0 11km N of Tennant, CA
  7. 1.8 21km ENE of McCloud, CA
  8. 2.2 21km ENE of McCloud, CA
  9. 1.8 13km ENE of Carrick, CA
  10. 2.0 7km ESE of McCloud, CA
  11. 1.6 4km W of Edgewood, CA
  12. 2.6 23km SW of Mount Hebron, CA
  13. 1.8 9km E of McCloud, CA
  14. 2.6 25km ENE of Hornbrook, CA
  15. 1.8 9km N of McCloud, 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.