QuakeIndex

quarry blast · reviewed by a seismologist

M 1.8md

9 km NE of Shasta Lake, CA

· -0.6 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 22 kmTrinity County 69 kmTehama County 69 kmSiskiyou County 96 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
-0.6 km below the surface
Felt
no reports yet
Nearest
Shasta County, 22 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1116 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 40.7455, -122.3080. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 22 km (14 mi) W of here earthquakes near Shasta County
Trinity County, CA 69 km (43 mi) E of here earthquakes near Trinity County
Tehama County, CA 69 km (43 mi) N of here earthquakes near Tehama County
Siskiyou County, CA 96 km (59 mi) SSE of here earthquakes near Siskiyou County

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

Aftershocks so far

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

  1. 1.7 12 km ESE of Anderson, CA
  2. 1.8 9 km NE of Shasta Lake, CA
  3. 1.6 16 km WSW of Shingletown, CA
  4. 1.6 15 km NE of Shasta Lake, CA
  5. 1.7 6 km NNW of Shasta Lake, CA
  6. 1.5 15 km S of McCloud, CA
  7. 1.5 16 km NNE of Shingletown, CA
  8. 1.9 6 km NNW of Shingletown, CA
  9. 2.1 13 km SE of Anderson, CA
  10. 1.5 9 km NE of Shasta Lake, CA
  11. 1.6 12 km ESE of Millville, CA
  12. 1.8 16 km NNE of Shingletown, CA
  13. 1.9 3 km NW of Shasta Lake, CA
  14. 2.4 11 km NE of Shasta Lake, CA
  15. 2.0 6 km WNW of Palo Cedro, 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.