QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

4 km WNW of Shasta Lake, CA

· 25 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 32 kmTrinity County 59 kmTehama County 65 kmSiskiyou 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 1.5 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Shasta County, 32 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 415 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 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 40.6938, -122.4158. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 32 km (20 mi) WSW of here earthquakes near Shasta County
Trinity County, CA 59 km (37 mi) E of here earthquakes near Trinity County
Tehama County, CA 65 km (40 mi) NNW of here earthquakes near Tehama County
Siskiyou County, CA 100 km (62 mi) S of here earthquakes near Siskiyou County
Butte County, CA 134 km (83 mi) NNW of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 2.0 30 km N of Shasta Lake, CA
  2. 2.0 4 km NNW of Millville, CA
  3. 2.2 12 km N of Shasta Lake, CA
  4. 1.8 15 km W of Round Mountain, CA
  5. 1.9 2 km N of Millville, CA
  6. 2.1 4 km E of Millville, CA
  7. 1.9 1 km S of Shasta Lake, CA
  8. 1.9 8 km NNE of Shasta, CA
  9. 1.8 9 km NE of Shasta Lake, CA
  10. 1.7 10 km SW of Shingletown, CA
  11. 2.1 19 km ESE of Anderson, CA
  12. 2.1 16 km SE of Anderson, CA
  13. 1.7 9 km WSW of Shingletown, CA
  14. 1.6 15 km WSW of Round Mountain, CA
  15. 1.7 23 km N of Shasta Lake, 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.