QuakeIndex

quarry blast · reviewed by a seismologist

M 1.7md

9km NE of Shasta Lake, CA

· -0.9 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 23 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 1.7 (md)
Depth
-0.9 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Shasta County, 23 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2775 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 40.7453, -122.3117. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 23 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

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

  1. 1.7 16km ESE of Anderson, CA
  2. 1.7 6km NE of Shasta Lake, CA
  3. 1.5 9km NNE of Shasta Lake, CA
  4. 1.7 12km NE of Shingletown, CA
  5. 1.7 8km NW of Montgomery Creek, CA
  6. 1.9 8km SW of Dunsmuir, CA
  7. 1.6 3km SW of Shasta Lake, CA
  8. 1.6 17km NNW of Shingletown, CA
  9. 1.5 9km SE of Dunsmuir, CA
  10. 2.0 8km WSW of Dunsmuir, CA
  11. 1.6 14km NNE of French Gulch, CA
  12. 1.7 13km NNE of French Gulch, CA
  13. 1.8 9km NNE of Shasta Lake, CA
  14. 1.8 18km NW of Viola, CA
  15. 1.8 17km NNE of Bella Vista, 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.