QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

8 km NW of McCloud, CA

· 4.0 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Siskiyou County 41 kmShasta County 63 kmTrinity County 107 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
4.0 km below the surface
Felt
no reports yet
Nearest
Siskiyou County, 41 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 902 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 41.3150, -122.1997. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Siskiyou County, CA 41 km (26 mi) SE of here earthquakes near Siskiyou County
Shasta County, CA 63 km (39 mi) NNW of here earthquakes near Shasta County
Trinity County, CA 107 km (66 mi) NE of here earthquakes near Trinity County
Josephine County, OR 165 km (102 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

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

  1. 1.7 21 km NE of Big Bend, CA
  2. 1.8 14 km NNE of McCloud, CA
  3. 1.5 29 km N of Shasta Lake, CA
  4. 1.6 12 km N of McCloud, CA
  5. 2.1 13 km N of McCloud, CA
  6. 2.0 24 km WSW of Big Bend, CA
  7. 1.7 13 km NNE of McCloud, CA
  8. 1.9 3 km WNW of Mount Shasta, CA
  9. 2.0 30 km N of Shasta Lake, CA
  10. 1.8 15 km NW of Big Bend, CA
  11. 1.7 23 km N of Shasta Lake, CA
  12. 2.1 13 km SSE of Tennant, CA
  13. 1.8 14 km NNE of McCloud, CA
  14. 2.0 13 km SSE of Tennant, CA
  15. 1.9 13 km SSE of Tennant, 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.